diff --git "a/java_abdiff_val.jsonl" "b/java_abdiff_val.jsonl" --- "a/java_abdiff_val.jsonl" +++ "b/java_abdiff_val.jsonl" @@ -1,652 +1,482 @@ -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.*;\n+import java.util.*;\n \n-public class newProgram5 {\n+public class Main {\n+ static long mod = 1000000007;\n \n- public static void main(String[] args) throws IOException {\n-\n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n-\n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ return r;\n }\n }\n \n-class Point {\n+class pair {\n+ A f;\n+ B s;\n \n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n }\n }\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+}", "output": "FASTER 0.5918", "pair_id": "java_4703_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.5071} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class EducationalRound49B {\n-\n- public static void main(String[] args) {\n-\n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n- }\n- out.close();\n- }\n-\n- public static PrintWriter out;\n-\n+public class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n }\n \n String next() {\n- while (st == null || !st.hasMoreTokens()) {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n+ } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return Integer.parseInt(next());\n }\n \n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n double nextDouble() {\n return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n }\n \n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n- } catch (Exception e) {\n+ } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n+ }\n+ }\n }", "output": "SLOWER 0.6543", "pair_id": "java_5777_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5739} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class newProgram5 {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n+ }\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n }\n \n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 5.1417", "pair_id": "java_4730_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 35.3026} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class Main {\n+public class B {\n+\n+ private static long N;\n+ private static long LAST;\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n }\n }\n }\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n+ private static long number(long i, long j) {\n \n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 1.4641", "pair_id": "java_5772_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.7589} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n+ static long mod = 1000000007;\n+\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- pair a[][] = new pair[2][4];\n+ return r;\n+ }\n+}\n \n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+class pair {\n+ A f;\n+ B s;\n \n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n \n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 1.6833", "pair_id": "java_4705_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.2116} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n-\n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n-\n- static class TaskAdapter implements Runnable {\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n- }\n- }\n-\n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n- }\n-\n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "SLOWER 2.5828", "pair_id": "java_4748_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 5.9909} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n+ TaskA solver = new TaskA();\n solver.solve(1, in, out);\n- out.flush();\n out.close();\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n }\n }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n+ return false;\n }\n }\n \n static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n }\n- return st.nextToken();\n }\n \n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n public int nextInt() {\n return Integer.parseInt(next());\n }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n }\n }", "output": "SLOWER 4.0502", "pair_id": "java_4745_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 16.566} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n \n public class Main {\n- static long mod = 1000000007;\n-\n public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n } else {\n- c[i][0] = x;\n- c[i][1] = y;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n- }\n-\n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n-\n- return r;\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 2.4634", "pair_id": "java_4706_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 5.515} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int zeros = 0;\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n-\n- x[i] = Integer.parseInt(st.nextToken());\n-\n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n }\n \n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n+ }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n \n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else {\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ }\n+ System.out.println();\n \n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n- }\n- }\n- } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n- break;\n- }\n- }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n- }\n- }\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n+ System.out.println();\n }\n }", "output": "SLOWER 1.78", "pair_id": "java_6815_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.4343} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n- }\n- System.out.println(p);\n+public class ProblemD {\n+\n+ public static void main(String[] args) {\n+\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0088", "pair_id": "java_192_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0061} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n+\n+ static class sort implements Comparable {\n+ int a, b, c;\n+\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n- pw.flush();\n+\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n+ }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 1.1438", "pair_id": "java_5760_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.2096} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n }\n-\n- q--;\n }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.6866", "pair_id": "java_5788_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.6095} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.InputStream;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n }\n \n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n }\n \n- public int nextInt() {\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n }", "output": "FASTER 1.6607", "pair_id": "java_4756_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.1616} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n-\n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n-\n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n- }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n }\n }\n \n public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n-\n- } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n- }\n- }\n+ new Solver();\n }\n \n- static class FS {\n+ static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n }\n \n private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n \n b = readByte();\n }\n return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n }\n \n public long nextLong() {\n b = readByte();\n }\n }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n+ }\n }\n }", "output": "SLOWER 0.4815", "pair_id": "java_5723_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.3962} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- static long N;\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ }\n \n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ if (neg) return -ret;\n+ return ret;\n+ }\n \n- System.out.println(nBef + cc + colSt);\n- }\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n+ long ans = 0, end = 0;\n \n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n- return (char) buf[bId++];\n- }\n \n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n+ q--;\n }\n }\n }", "output": "FASTER 0.057", "pair_id": "java_5783_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0403} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- static long N;\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n \n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- System.out.println(nBef + cc + colSt);\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n+ return str;\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n-\n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n }\n-\n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "SLOWER 0.5044", "pair_id": "java_5793_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.4185} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class R181D2A {\n+public class ArrayA_300A {\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int arr[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = sc.nextInt();\n+ }\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println();\n+ } else {\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ }\n }\n }\n-\n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n- }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- }\n-}", "output": "SLOWER 0.0949", "pair_id": "java_6829_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.068} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class newProgram5 {\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public static void main(String[] args) throws IOException {\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- }\n-\n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n-\n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n+ }\n }\n \n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 5.8057", "pair_id": "java_4731_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 55.9359} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n \n public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n \n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n+ Scanner sc = new Scanner(System.in);\n \n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n \n+ init(n1);\n+ arr = new int[op_num];\n+\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n+ i1++;\n+ mark++;\n }\n }\n \n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n+ private static int find(int n1, int n2) {\n+\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n }\n \n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n \n- if (x > right || y < left) return;\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n+ }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ }\n \n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n- }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ public static void init(int N) {\n+\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n }", "output": "FASTER 0.0647", "pair_id": "java_5749_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.0459} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class MyClass {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- System.out.println(sum);\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.1105", "pair_id": "java_189_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0796} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.lang.reflect.Constructor;\nimport java.util.ArrayDeque;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collection;\nimport java.util.InputMismatchException;\nimport java.util.Iterator;\nimport java.util.LinkedList;\nimport java.util.StringTokenizer;\n\npublic class CodeB {\n private static final boolean SHOULD_BUFFER_OUTPUT = false;\n\n static final SuperWriter sw = new SuperWriter(System.out);\n\n static final SuperScanner sc = new SuperScanner();\n\n static Node[] nodes;\n\n static class Answer implements Comparable {\n final int[] nodes;\n final int cost;\n\n Answer(int a, int b, int cost) {\n this.nodes = new int[] {a, b};\n this.cost = cost;\n }\n\n public Answer(Answer other, int id, int addedCost) {\n this.nodes = new int[other.nodes.length + 1];\n this.nodes[0] = id;\n for (int i = 0; i < other.nodes.length; i++) {\n this.nodes[i + 1] = other.nodes[i];\n }\n this.cost = other.cost + addedCost;\n }\n\n boolean contains(int id) {\n for (int i : nodes) {\n if (i == id) {\n return true;\n }\n }\n return false;\n }\n\n @Override\n public int compareTo(Answer o) {\n return o.cost - cost;\n }\n }\n\n static Answer[] tmpSort;\n\n static Answer[] getN(ArrayList values, int n) {\n Answer[] answer = new Answer[n];\n int currentMinIndex = 0;\n int currentSize = 0;\n for (Answer v : values) {\n if (currentSize != n) {\n answer[currentSize++] = v;\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n } else {\n if (v.cost > answer[currentMinIndex].cost) {\n answer[currentMinIndex] = v;\n }\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n }\n }\n Arrays.sort(answer);\n return answer;\n }\n\n static class Node {\n final ArrayList edges = new ArrayList<>();\n final int id;\n int visitedCost;\n int[] costs;\n Answer[] first;\n Answer[] second;\n\n Node(int id) {\n this.id = id;\n }\n\n Answer[] getFirst() {\n if (first != null) {\n return first;\n }\n ArrayList firstTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n firstTmp.add(new Answer(id, i, cost));\n }\n first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n return first;\n }\n\n Answer[] getSecond() {\n if (second != null) {\n return second;\n }\n LinkedList missing = new LinkedList<>();\n for (int i = 0; i < nodes.length; i++) {\n if (i != id) {\n missing.add(i);\n }\n }\n ArrayList secondTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n for (Answer answer : nodes[i].getFirst()) {\n if (!answer.contains(id)) {\n secondTmp.add(new Answer(answer, id, cost));\n }\n }\n }\n Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n ArrayList relevants = new ArrayList<>();\n for (Answer answer : secondTmp2) {\n if (missing.isEmpty()) {\n break;\n }\n boolean relevant = false;\n Iterator it = missing.iterator();\n while (it.hasNext()) {\n int next = it.next();\n if (!answer.contains(next)) {\n it.remove();\n relevant = true;\n }\n }\n if (relevant) {\n relevants.add(answer);\n }\n }\n return second = relevants.toArray(new Answer[0]);\n }\n\n Answer getSolution(int first, int cost) {\n for (Answer answer : getSecond()) {\n if (!answer.contains(first)) {\n return new Answer(answer, first, cost);\n }\n }\n return null;\n }\n\n Answer getSolution() {\n Answer best = null;\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n Answer possible = nodes[i].getSolution(id, cost);\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n return best;\n }\n }\n\n static int[] getCosts(Node[] nodes, int fromNode) {\n for (Node node : nodes) {\n node.visitedCost = Integer.MAX_VALUE;\n }\n int[] answer = new int[nodes.length];\n Arrays.fill(answer, Integer.MAX_VALUE);\n answer[fromNode] = 0;\n nodes[fromNode].visitedCost = 0;\n ArrayDeque queue = new ArrayDeque<>();\n queue.add(nodes[fromNode]);\n while (!queue.isEmpty()) {\n Node current = queue.pollFirst();\n for (Node edge : current.edges) {\n if (edge.visitedCost != Integer.MAX_VALUE) {\n continue;\n }\n answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n queue.add(edge);\n }\n }\n return answer;\n }\n\n public static void main() {\n int n = sc.nextInt();\n int m = sc.nextInt();\n nodes = new Node[n];\n tmpSort = new Answer[4 * (m + 1)];\n for (int i = 0; i < n; i++) {\n nodes[i] = new Node(i);\n }\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n nodes[u].edges.add(nodes[v]);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n Answer best = null;\n for (int i = 0; i < n; i++) {\n Answer possible = nodes[i].getSolution();\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n for (int i = 0; i < 4; i++) {\n best.nodes[i]++;\n }\n sw.printLine(best.nodes);\n }\n\n static class LineScanner extends Scanner {\n private StringTokenizer st;\n\n public LineScanner(String input) {\n st = new StringTokenizer(input);\n }\n\n @Override\n public String next() {\n return st.hasMoreTokens() ? st.nextToken() : null;\n }\n\n @Override\n public String nextLine() {\n throw new RuntimeException(\"not supported\");\n }\n\n public boolean hasNext() {\n return st.hasMoreTokens();\n }\n\n private final ArrayList temp = new ArrayList();\n\n private void fillTemp() {\n while (st.hasMoreTokens()) {\n temp.add(st.nextToken());\n }\n }\n\n public String[] asStringArray() {\n fillTemp();\n String[] answer = new String[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = (String) temp.get(i);\n }\n temp.clear();\n return answer;\n }\n\n public int[] asIntArray() {\n fillTemp();\n int[] answer = new int[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Integer.parseInt((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public long[] asLongArray() {\n fillTemp();\n long[] answer = new long[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Long.parseLong((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public double[] asDoubleArray() {\n fillTemp();\n double[] answer = new double[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Double.parseDouble((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n }\n\n static class SuperScanner extends Scanner {\n private InputStream stream;\n private byte[] buf = new byte[8096];\n private int curChar;\n private int numChars;\n\n public SuperScanner() {\n this.stream = System.in;\n }\n\n public int read() {\n if (numChars == -1) return -1;\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public static boolean isWhitespace(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n public static boolean isLineEnd(int c) {\n return c == '\\n' || c == -1;\n }\n\n private final StringBuilder sb = new StringBuilder();\n\n @Override\n public String next() {\n int c = read();\n while (isWhitespace(c)) {\n if (c == -1) {\n return null;\n }\n c = read();\n }\n sb.setLength(0);\n do {\n sb.append((char) c);\n c = read();\n } while (!isWhitespace(c));\n return sb.toString();\n }\n\n @Override\n public String nextLine() {\n sb.setLength(0);\n int c;\n while (true) {\n c = read();\n if (!isLineEnd(c)) {\n sb.append((char) c);\n } else {\n break;\n }\n }\n if (c == -1 && sb.length() == 0) {\n return null;\n } else {\n if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n return sb.substring(0, sb.length() - 1);\n } else {\n return sb.toString();\n }\n }\n }\n\n public LineScanner nextLineScanner() {\n String line = nextLine();\n if (line == null) {\n return null;\n } else {\n return new LineScanner(line);\n }\n }\n\n public LineScanner nextNonEmptyLineScanner() {\n while (true) {\n String line = nextLine();\n if (line == null) {\n return null;\n } else if (!line.isEmpty()) {\n return new LineScanner(line);\n }\n }\n }\n\n @Override\n public int nextInt() {\n int c = read();\n while (isWhitespace(c)) {\n c = read();\n }\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n\n @Override\n public long nextLong() {\n int c = read();\n while (isWhitespace(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n long res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n }\n\n abstract static class Scanner {\n\n public abstract String next();\n\n public abstract String nextLine();\n\n public int nextIntOrQuit() {\n Integer n = nextInteger();\n if (n == null) {\n sw.close();\n System.exit(0);\n }\n return n.intValue();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public int[] nextIntArray(int n) {\n int[] res = new int[n];\n for (int i = 0; i < res.length; i++) res[i] = nextInt();\n return res;\n }\n\n public long[] nextLongArray(int n) {\n long[] res = new long[n];\n for (int i = 0; i < res.length; i++) res[i] = nextLong();\n return res;\n }\n\n public double[] nextDoubleArray(int n) {\n double[] res = new double[n];\n for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n return res;\n }\n\n public void sortIntArray(int[] array) {\n Integer[] vals = new Integer[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortLongArray(long[] array) {\n Long[] vals = new Long[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortDoubleArray(double[] array) {\n Double[] vals = new Double[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public String[] nextStringArray(int n) {\n String[] vals = new String[n];\n for (int i = 0; i < n; i++) vals[i] = next();\n return vals;\n }\n\n public Integer nextInteger() {\n String s = next();\n if (s == null) return null;\n return Integer.parseInt(s);\n }\n\n public int[][] nextIntMatrix(int n, int m) {\n int[][] ans = new int[n][];\n for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n return ans;\n }\n\n public char[][] nextGrid(int r) {\n char[][] grid = new char[r][];\n for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n return grid;\n }\n\n public static T fill(T arreglo, int val) {\n if (arreglo instanceof Object[]) {\n Object[] a = (Object[]) arreglo;\n for (Object x : a) fill(x, val);\n } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n return arreglo;\n }\n\n public T[] nextObjectArray(Class clazz, int size) {\n @SuppressWarnings(\"unchecked\")\n T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n for (int c = 0; c < 3; c++) {\n Constructor constructor;\n try {\n if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n else constructor = clazz.getDeclaredConstructor();\n } catch (Exception e) {\n continue;\n }\n try {\n for (int i = 0; i < result.length; i++) {\n if (c == 0) result[i] = constructor.newInstance(this, i);\n else if (c == 1) result[i] = constructor.newInstance(this);\n else result[i] = constructor.newInstance();\n }\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n return result;\n }\n throw new RuntimeException(\"Constructor not found\");\n }\n\n public Collection wrap(int[] as) {\n ArrayList ans = new ArrayList();\n for (int i : as) ans.add(i);\n return ans;\n }\n\n public int[] unwrap(Collection collection) {\n int[] vals = new int[collection.size()];\n int index = 0;\n for (int i : collection) vals[index++] = i;\n return vals;\n }\n\n int testCases = Integer.MIN_VALUE;\n\n boolean testCases() {\n if (testCases == Integer.MIN_VALUE) {\n testCases = nextInt();\n }\n return --testCases >= 0;\n }\n }\n\n static class SuperWriter {\n\n private final PrintWriter writer;\n\n public SuperWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public SuperWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void close() {\n writer.flush();\n writer.close();\n }\n\n public void printLine(String line) {\n writer.println(line);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(long... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int prec, double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n String precision = \"%.\" + prec + \"f\";\n writer.print(String.format(precision, vals[0]).replace(',', '.'));\n precision = \" \" + precision;\n for (int i = 1; i < vals.length; i++)\n writer.print(String.format(precision, vals[i]).replace(',', '.'));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(Collection vals) {\n if (vals.size() == 0) {\n writer.println();\n } else {\n int i = 0;\n for (E val : vals) {\n if (i++ == 0) {\n writer.print(val.toString());\n } else {\n writer.print(\" \".concat(val.toString()));\n }\n }\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printSimple(String value) {\n writer.print(value);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public boolean ifZeroExit(Number... values) {\n for (Number number : values) {\n if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n return false;\n }\n }\n close();\n System.exit(0);\n return true;\n }\n }\n\n public static void main(String[] args) {\n main();\n sw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class worldTour {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n Queue q = new LinkedList();\n ArrayList> neigh = new ArrayList>();\n boolean[][] con = new boolean[n][n];\n int m = sc.nextInt();\n\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n con[u][v] = true;\n }\n\n int[][] dis = new int[n][n];\n for (int i = 0; i < n; i++) {\n neigh.add(new ArrayList());\n for (int j = 0; j < n; j++) {\n if (con[i][j]) neigh.get(i).add(j);\n if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n }\n\n for (int i = 0; i < n; i++) {\n boolean[] vis = new boolean[n];\n q.add(i);\n vis[i] = true;\n while (q.peek() != null) {\n int v = q.poll();\n for (int k = 0; k < neigh.get(v).size(); k++) {\n int j = neigh.get(v).get(k);\n if (!vis[j]) {\n q.add(j);\n vis[j] = true;\n dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n }\n }\n }\n }\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n }\n }\n int[][] prefout = new int[n][3];\n int[][] prefin = new int[n][3];\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][2] = index;\n }\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][2] = index;\n }\n\n int maxDis = -1;\n int[] path = new int[4];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (i == j) continue;\n if (dis[i][j] < 0) continue;\n int IF = 0;\n int JF = 0;\n int IS = 1;\n int JS = 1;\n if (prefin[i][0] == j) IF = 1;\n if (prefout[j][0] == i) JF = 1;\n if (prefin[i][IF + 1] == j) IS = 2;\n if (prefout[j][JF + 1] == i) JS = 2;\n int u = prefin[i][IF];\n int v = prefout[j][JF];\n if (u < 0 || v < 0) continue;\n if (u != v) {\n int D = dis[u][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n } else {\n int uu = prefin[i][IS];\n int vv = prefin[j][JS];\n int D;\n if (uu >= 0 && uu != v) {\n D = dis[uu][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = uu;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n }\n if (vv >= 0 && vv != u) {\n D = dis[u][i] + dis[i][j] + dis[j][vv];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = vv;\n }\n }\n }\n }\n }\n System.out.println(\n (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.lang.reflect.Constructor;\n-import java.util.ArrayDeque;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.Collection;\n-import java.util.InputMismatchException;\n-import java.util.Iterator;\n-import java.util.LinkedList;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class CodeB {\n- private static final boolean SHOULD_BUFFER_OUTPUT = false;\n+public class worldTour {\n \n- static final SuperWriter sw = new SuperWriter(System.out);\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ Queue q = new LinkedList();\n+ ArrayList> neigh = new ArrayList>();\n+ boolean[][] con = new boolean[n][n];\n+ int m = sc.nextInt();\n \n- static final SuperScanner sc = new SuperScanner();\n-\n- static Node[] nodes;\n-\n- static class Answer implements Comparable {\n- final int[] nodes;\n- final int cost;\n-\n- Answer(int a, int b, int cost) {\n- this.nodes = new int[] {a, b};\n- this.cost = cost;\n+ for (int i = 0; i < m; i++) {\n+ int u = sc.nextInt() - 1;\n+ int v = sc.nextInt() - 1;\n+ con[u][v] = true;\n }\n \n- public Answer(Answer other, int id, int addedCost) {\n- this.nodes = new int[other.nodes.length + 1];\n- this.nodes[0] = id;\n- for (int i = 0; i < other.nodes.length; i++) {\n- this.nodes[i + 1] = other.nodes[i];\n+ int[][] dis = new int[n][n];\n+ for (int i = 0; i < n; i++) {\n+ neigh.add(new ArrayList());\n+ for (int j = 0; j < n; j++) {\n+ if (con[i][j]) neigh.get(i).add(j);\n+ if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n- this.cost = other.cost + addedCost;\n }\n \n- boolean contains(int id) {\n- for (int i : nodes) {\n- if (i == id) {\n- return true;\n- }\n- }\n- return false;\n- }\n-\n- @Override\n- public int compareTo(Answer o) {\n- return o.cost - cost;\n- }\n- }\n-\n- static Answer[] tmpSort;\n-\n- static Answer[] getN(ArrayList values, int n) {\n- Answer[] answer = new Answer[n];\n- int currentMinIndex = 0;\n- int currentSize = 0;\n- for (Answer v : values) {\n- if (currentSize != n) {\n- answer[currentSize++] = v;\n- int min = Integer.MAX_VALUE;\n- for (int i = 0; i < n; i++) {\n- if (answer[i] != null && answer[i].cost < min) {\n- currentMinIndex = i;\n- min = answer[i].cost;\n- }\n- }\n- } else {\n- if (v.cost > answer[currentMinIndex].cost) {\n- answer[currentMinIndex] = v;\n- }\n- int min = Integer.MAX_VALUE;\n- for (int i = 0; i < n; i++) {\n- if (answer[i] != null && answer[i].cost < min) {\n- currentMinIndex = i;\n- min = answer[i].cost;\n+ for (int i = 0; i < n; i++) {\n+ boolean[] vis = new boolean[n];\n+ q.add(i);\n+ vis[i] = true;\n+ while (q.peek() != null) {\n+ int v = q.poll();\n+ for (int k = 0; k < neigh.get(v).size(); k++) {\n+ int j = neigh.get(v).get(k);\n+ if (!vis[j]) {\n+ q.add(j);\n+ vis[j] = true;\n+ dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n }\n }\n }\n }\n- Arrays.sort(answer);\n- return answer;\n- }\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < n; j++) {\n+ if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n+ }\n+ }\n+ int[][] prefout = new int[n][3];\n+ int[][] prefin = new int[n][3];\n \n- static class Node {\n- final ArrayList edges = new ArrayList<>();\n- final int id;\n- int visitedCost;\n- int[] costs;\n- Answer[] first;\n- Answer[] second;\n-\n- Node(int id) {\n- this.id = id;\n+ for (int i = 0; i < n; i++) {\n+ int max = -1;\n+ int index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max) {\n+ max = dis[i][j];\n+ index = j;\n+ }\n+ }\n+ prefout[i][0] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n+ max = dis[i][j];\n+ index = j;\n+ }\n+ }\n+ prefout[i][1] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n+ max = dis[i][j];\n+ index = j;\n+ }\n+ }\n+ prefout[i][2] = index;\n }\n \n- Answer[] getFirst() {\n- if (first != null) {\n- return first;\n+ for (int i = 0; i < n; i++) {\n+ int max = -1;\n+ int index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max) {\n+ max = dis[j][i];\n+ index = j;\n+ }\n }\n- ArrayList firstTmp = new ArrayList<>();\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n+ prefin[i][0] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n+ max = dis[j][i];\n+ index = j;\n }\n- firstTmp.add(new Answer(id, i, cost));\n }\n- first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n- return first;\n+ prefin[i][1] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n+ max = dis[j][i];\n+ index = j;\n+ }\n+ }\n+ prefin[i][2] = index;\n }\n \n- Answer[] getSecond() {\n- if (second != null) {\n- return second;\n- }\n- LinkedList missing = new LinkedList<>();\n- for (int i = 0; i < nodes.length; i++) {\n- if (i != id) {\n- missing.add(i);\n- }\n- }\n- ArrayList secondTmp = new ArrayList<>();\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n- }\n- for (Answer answer : nodes[i].getFirst()) {\n- if (!answer.contains(id)) {\n- secondTmp.add(new Answer(answer, id, cost));\n+ int maxDis = -1;\n+ int[] path = new int[4];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < n; j++) {\n+ if (i == j) continue;\n+ if (dis[i][j] < 0) continue;\n+ int IF = 0;\n+ int JF = 0;\n+ int IS = 1;\n+ int JS = 1;\n+ if (prefin[i][0] == j) IF = 1;\n+ if (prefout[j][0] == i) JF = 1;\n+ if (prefin[i][IF + 1] == j) IS = 2;\n+ if (prefout[j][JF + 1] == i) JS = 2;\n+ int u = prefin[i][IF];\n+ int v = prefout[j][JF];\n+ if (u < 0 || v < 0) continue;\n+ if (u != v) {\n+ int D = dis[u][i] + dis[i][j] + dis[j][v];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = u;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = v;\n+ }\n+ } else {\n+ int uu = prefin[i][IS];\n+ int vv = prefin[j][JS];\n+ int D;\n+ if (uu >= 0 && uu != v) {\n+ D = dis[uu][i] + dis[i][j] + dis[j][v];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = uu;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = v;\n+ }\n+ }\n+ if (vv >= 0 && vv != u) {\n+ D = dis[u][i] + dis[i][j] + dis[j][vv];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = u;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = vv;\n+ }\n }\n }\n }\n- Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n- ArrayList relevants = new ArrayList<>();\n- for (Answer answer : secondTmp2) {\n- if (missing.isEmpty()) {\n- break;\n- }\n- boolean relevant = false;\n- Iterator it = missing.iterator();\n- while (it.hasNext()) {\n- int next = it.next();\n- if (!answer.contains(next)) {\n- it.remove();\n- relevant = true;\n- }\n- }\n- if (relevant) {\n- relevants.add(answer);\n- }\n- }\n- return second = relevants.toArray(new Answer[0]);\n }\n-\n- Answer getSolution(int first, int cost) {\n- for (Answer answer : getSecond()) {\n- if (!answer.contains(first)) {\n- return new Answer(answer, first, cost);\n- }\n- }\n- return null;\n- }\n-\n- Answer getSolution() {\n- Answer best = null;\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n- }\n- Answer possible = nodes[i].getSolution(id, cost);\n- if (possible != null) {\n- if (best == null || possible.cost > best.cost) {\n- best = possible;\n- }\n- }\n- }\n- return best;\n- }\n- }\n-\n- static int[] getCosts(Node[] nodes, int fromNode) {\n- for (Node node : nodes) {\n- node.visitedCost = Integer.MAX_VALUE;\n- }\n- int[] answer = new int[nodes.length];\n- Arrays.fill(answer, Integer.MAX_VALUE);\n- answer[fromNode] = 0;\n- nodes[fromNode].visitedCost = 0;\n- ArrayDeque queue = new ArrayDeque<>();\n- queue.add(nodes[fromNode]);\n- while (!queue.isEmpty()) {\n- Node current = queue.pollFirst();\n- for (Node edge : current.edges) {\n- if (edge.visitedCost != Integer.MAX_VALUE) {\n- continue;\n- }\n- answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n- queue.add(edge);\n- }\n- }\n- return answer;\n- }\n-\n- public static void main() {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- nodes = new Node[n];\n- tmpSort = new Answer[4 * (m + 1)];\n- for (int i = 0; i < n; i++) {\n- nodes[i] = new Node(i);\n- }\n- for (int i = 0; i < m; i++) {\n- int u = sc.nextInt() - 1;\n- int v = sc.nextInt() - 1;\n- nodes[u].edges.add(nodes[v]);\n- }\n- for (int i = 0; i < n; i++) {\n- nodes[i].costs = getCosts(nodes, i);\n- }\n- for (int i = 0; i < n; i++) {\n- nodes[i].costs = getCosts(nodes, i);\n- }\n- Answer best = null;\n- for (int i = 0; i < n; i++) {\n- Answer possible = nodes[i].getSolution();\n- if (possible != null) {\n- if (best == null || possible.cost > best.cost) {\n- best = possible;\n- }\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- best.nodes[i]++;\n- }\n- sw.printLine(best.nodes);\n- }\n-\n- static class LineScanner extends Scanner {\n- private StringTokenizer st;\n-\n- public LineScanner(String input) {\n- st = new StringTokenizer(input);\n- }\n-\n- @Override\n- public String next() {\n- return st.hasMoreTokens() ? st.nextToken() : null;\n- }\n-\n- @Override\n- public String nextLine() {\n- throw new RuntimeException(\"not supported\");\n- }\n-\n- public boolean hasNext() {\n- return st.hasMoreTokens();\n- }\n-\n- private final ArrayList temp = new ArrayList();\n-\n- private void fillTemp() {\n- while (st.hasMoreTokens()) {\n- temp.add(st.nextToken());\n- }\n- }\n-\n- public String[] asStringArray() {\n- fillTemp();\n- String[] answer = new String[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = (String) temp.get(i);\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public int[] asIntArray() {\n- fillTemp();\n- int[] answer = new int[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Integer.parseInt((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public long[] asLongArray() {\n- fillTemp();\n- long[] answer = new long[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Long.parseLong((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public double[] asDoubleArray() {\n- fillTemp();\n- double[] answer = new double[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Double.parseDouble((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n- }\n-\n- static class SuperScanner extends Scanner {\n- private InputStream stream;\n- private byte[] buf = new byte[8096];\n- private int curChar;\n- private int numChars;\n-\n- public SuperScanner() {\n- this.stream = System.in;\n- }\n-\n- public int read() {\n- if (numChars == -1) return -1;\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public static boolean isWhitespace(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-\n- public static boolean isLineEnd(int c) {\n- return c == '\\n' || c == -1;\n- }\n-\n- private final StringBuilder sb = new StringBuilder();\n-\n- @Override\n- public String next() {\n- int c = read();\n- while (isWhitespace(c)) {\n- if (c == -1) {\n- return null;\n- }\n- c = read();\n- }\n- sb.setLength(0);\n- do {\n- sb.append((char) c);\n- c = read();\n- } while (!isWhitespace(c));\n- return sb.toString();\n- }\n-\n- @Override\n- public String nextLine() {\n- sb.setLength(0);\n- int c;\n- while (true) {\n- c = read();\n- if (!isLineEnd(c)) {\n- sb.append((char) c);\n- } else {\n- break;\n- }\n- }\n- if (c == -1 && sb.length() == 0) {\n- return null;\n- } else {\n- if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n- return sb.substring(0, sb.length() - 1);\n- } else {\n- return sb.toString();\n- }\n- }\n- }\n-\n- public LineScanner nextLineScanner() {\n- String line = nextLine();\n- if (line == null) {\n- return null;\n- } else {\n- return new LineScanner(line);\n- }\n- }\n-\n- public LineScanner nextNonEmptyLineScanner() {\n- while (true) {\n- String line = nextLine();\n- if (line == null) {\n- return null;\n- } else if (!line.isEmpty()) {\n- return new LineScanner(line);\n- }\n- }\n- }\n-\n- @Override\n- public int nextInt() {\n- int c = read();\n- while (isWhitespace(c)) {\n- c = read();\n- }\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res = (res << 3) + (res << 1);\n- res += c - '0';\n- c = read();\n- } while (!isWhitespace(c));\n- return res * sgn;\n- }\n-\n- @Override\n- public long nextLong() {\n- int c = read();\n- while (isWhitespace(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- long res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res = (res << 3) + (res << 1);\n- res += c - '0';\n- c = read();\n- } while (!isWhitespace(c));\n- return res * sgn;\n- }\n- }\n-\n- abstract static class Scanner {\n-\n- public abstract String next();\n-\n- public abstract String nextLine();\n-\n- public int nextIntOrQuit() {\n- Integer n = nextInteger();\n- if (n == null) {\n- sw.close();\n- System.exit(0);\n- }\n- return n.intValue();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public int[] nextIntArray(int n) {\n- int[] res = new int[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextInt();\n- return res;\n- }\n-\n- public long[] nextLongArray(int n) {\n- long[] res = new long[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextLong();\n- return res;\n- }\n-\n- public double[] nextDoubleArray(int n) {\n- double[] res = new double[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n- return res;\n- }\n-\n- public void sortIntArray(int[] array) {\n- Integer[] vals = new Integer[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public void sortLongArray(long[] array) {\n- Long[] vals = new Long[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public void sortDoubleArray(double[] array) {\n- Double[] vals = new Double[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public String[] nextStringArray(int n) {\n- String[] vals = new String[n];\n- for (int i = 0; i < n; i++) vals[i] = next();\n- return vals;\n- }\n-\n- public Integer nextInteger() {\n- String s = next();\n- if (s == null) return null;\n- return Integer.parseInt(s);\n- }\n-\n- public int[][] nextIntMatrix(int n, int m) {\n- int[][] ans = new int[n][];\n- for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n- return ans;\n- }\n-\n- public char[][] nextGrid(int r) {\n- char[][] grid = new char[r][];\n- for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n- return grid;\n- }\n-\n- public static T fill(T arreglo, int val) {\n- if (arreglo instanceof Object[]) {\n- Object[] a = (Object[]) arreglo;\n- for (Object x : a) fill(x, val);\n- } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n- else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n- else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n- return arreglo;\n- }\n-\n- public T[] nextObjectArray(Class clazz, int size) {\n- @SuppressWarnings(\"unchecked\")\n- T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n- for (int c = 0; c < 3; c++) {\n- Constructor constructor;\n- try {\n- if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n- else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n- else constructor = clazz.getDeclaredConstructor();\n- } catch (Exception e) {\n- continue;\n- }\n- try {\n- for (int i = 0; i < result.length; i++) {\n- if (c == 0) result[i] = constructor.newInstance(this, i);\n- else if (c == 1) result[i] = constructor.newInstance(this);\n- else result[i] = constructor.newInstance();\n- }\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- return result;\n- }\n- throw new RuntimeException(\"Constructor not found\");\n- }\n-\n- public Collection wrap(int[] as) {\n- ArrayList ans = new ArrayList();\n- for (int i : as) ans.add(i);\n- return ans;\n- }\n-\n- public int[] unwrap(Collection collection) {\n- int[] vals = new int[collection.size()];\n- int index = 0;\n- for (int i : collection) vals[index++] = i;\n- return vals;\n- }\n-\n- int testCases = Integer.MIN_VALUE;\n-\n- boolean testCases() {\n- if (testCases == Integer.MIN_VALUE) {\n- testCases = nextInt();\n- }\n- return --testCases >= 0;\n- }\n- }\n-\n- static class SuperWriter {\n-\n- private final PrintWriter writer;\n-\n- public SuperWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public SuperWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void close() {\n- writer.flush();\n- writer.close();\n- }\n-\n- public void printLine(String line) {\n- writer.println(line);\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(int... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(long... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(double... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(int prec, double... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- String precision = \"%.\" + prec + \"f\";\n- writer.print(String.format(precision, vals[0]).replace(',', '.'));\n- precision = \" \" + precision;\n- for (int i = 1; i < vals.length; i++)\n- writer.print(String.format(precision, vals[i]).replace(',', '.'));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(Collection vals) {\n- if (vals.size() == 0) {\n- writer.println();\n- } else {\n- int i = 0;\n- for (E val : vals) {\n- if (i++ == 0) {\n- writer.print(val.toString());\n- } else {\n- writer.print(\" \".concat(val.toString()));\n- }\n- }\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printSimple(String value) {\n- writer.print(value);\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public boolean ifZeroExit(Number... values) {\n- for (Number number : values) {\n- if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n- return false;\n- }\n- }\n- close();\n- System.exit(0);\n- return true;\n- }\n- }\n-\n- public static void main(String[] args) {\n- main();\n- sw.close();\n+ System.out.println(\n+ (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n }", "output": "SLOWER 2.7201", "pair_id": "java_6748_reversed", "problem_id": "666_B", "language": "java", "direction": "reversed", "speedup_ratio": 6.5891} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt(), q = in.nextInt();\n-\n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n-\n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n- }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n+ new Solver();\n+ }\n+\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n }\n }\n }\n }\n-\n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n- }\n- return pow2 * 2;\n- }\n-\n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n-\n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n-\n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n- }\n-}", "output": "FASTER 1.0975", "pair_id": "java_5736_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.1398} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n-\n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n-\n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n- }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n+ }\n }\n }\n \n public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n-\n- } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n- }\n- }\n- }\n-\n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n }\n }\n }", "output": "SLOWER 0.2787", "pair_id": "java_5722_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.2131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n- }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n }\n \n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n return;\n }\n }\n }\n- out.println(\"NO\");\n- }\n-\n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n+ out.print(\"NO\");\n }\n }\n \n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public FastInput(InputStream is) {\n- this.is = is;\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n try {\n- bufLen = is.read(buf);\n+ s = br.readLine();\n } catch (IOException e) {\n- bufLen = -1;\n+ e.printStackTrace();\n }\n- if (bufLen == -1) {\n- return -1;\n- }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n- return buf[bufOffset++];\n+ return st.nextToken();\n }\n \n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n }\n+ return true;\n }\n \n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n+ public long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n }", "output": "FASTER 0.7801", "pair_id": "java_4740_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.7172} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n \n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n \n- HashMap map = new HashMap();\n+ String[] a = new String[n];\n+ int[] b = new int[n];\n+\n for (int i = 0; i < n; i++) {\n- String s = sc.next().replace(\"*\", \".\");\n- int price = sc.nextInt();\n- map.put(s, price);\n+ a[i] = sc.next();\n+ b[i] = sc.nextInt();\n }\n \n- int ans = 0;\n+ int sum = 0;\n+ int c = 0;\n+ String s = \"\";\n+\n for (int i = 0; i < m; i++) {\n- String x = sc.next();\n- for (String s : map.keySet()) {\n- if (x.matches(s)) {\n- ans += map.get(s);\n- break;\n- }\n+ s = sc.next();\n+ for (int j = 0; j < n; j++) {\n+ c = 0;\n+ while (a[j].codePointAt(c) == 42) c++;\n+ if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n-\n- System.out.println(ans);\n+ System.out.println(sum);\n }\n }\n }", "output": "FASTER 1.1166", "pair_id": "java_1004_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.1684} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner scanner = new Scanner(System.in)) {\n long n = scanner.nextLong();\n int x = scanner.nextInt(), m = scanner.nextInt();\n List list = new ArrayList<>();\n\n Set set = new HashSet<>();\n long next = x % m;\n list.add(next);\n set.add(next);\n while (list.size() < n) {\n next = next * next % m;\n if (set.contains(next)) {\n break;\n }\n set.add(next);\n list.add(next);\n }\n if (list.size() == n) {\n\n System.out.println(list.stream().mapToLong(i -> i).sum());\n } else {\n\n int start = list.indexOf(next);\n\n long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n\n long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n\n long bai = (n - start) / (list.size() - start);\n\n long remain = (n - start) % (list.size() - start);\n System.out.println(\n startSum\n + bai * loop\n + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n\n Scanner sc = new Scanner(System.in);\n long k = sc.nextLong();\n int x = sc.nextInt();\n int m = sc.nextInt();\n\n Set set = new HashSet();\n List list = new ArrayList();\n int now = x;\n set.add(now);\n list.add(now);\n int last = 0;\n for (long i = 0; i < k; i++) {\n now = (int) ((long) now * now % m);\n if (set.contains(now)) {\n last = now;\n break;\n } else {\n set.add(now);\n list.add(now);\n }\n }\n\n int loop_idx = 0;\n for (int i = 0; i < list.size(); i++) {\n if (list.get(i) == last) {\n loop_idx = i;\n }\n }\n\n long ans = 0;\n\n for (int i = 0; i < loop_idx; i++) {\n ans += list.get(i);\n }\n k -= loop_idx;\n\n long loop_sum = 0;\n for (int i = loop_idx; i < list.size(); i++) {\n loop_sum += list.get(i);\n }\n long len = list.size() - loop_idx;\n long block = k / len;\n ans += loop_sum * block;\n k %= len;\n\n for (int i = loop_idx; i < loop_idx + k; i++) {\n ans += list.get(i);\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) throws Exception {\n \n- public static void main(String[] args) {\n- try (Scanner scanner = new Scanner(System.in)) {\n- long n = scanner.nextLong();\n- int x = scanner.nextInt(), m = scanner.nextInt();\n- List list = new ArrayList<>();\n+ Scanner sc = new Scanner(System.in);\n+ long k = sc.nextLong();\n+ int x = sc.nextInt();\n+ int m = sc.nextInt();\n \n- Set set = new HashSet<>();\n- long next = x % m;\n- list.add(next);\n- set.add(next);\n- while (list.size() < n) {\n- next = next * next % m;\n- if (set.contains(next)) {\n- break;\n- }\n- set.add(next);\n- list.add(next);\n- }\n- if (list.size() == n) {\n-\n- System.out.println(list.stream().mapToLong(i -> i).sum());\n+ Set set = new HashSet();\n+ List list = new ArrayList();\n+ int now = x;\n+ set.add(now);\n+ list.add(now);\n+ int last = 0;\n+ for (long i = 0; i < k; i++) {\n+ now = (int) ((long) now * now % m);\n+ if (set.contains(now)) {\n+ last = now;\n+ break;\n } else {\n-\n- int start = list.indexOf(next);\n-\n- long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n-\n- long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n-\n- long bai = (n - start) / (list.size() - start);\n-\n- long remain = (n - start) % (list.size() - start);\n- System.out.println(\n- startSum\n- + bai * loop\n- + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n+ set.add(now);\n+ list.add(now);\n }\n }\n+\n+ int loop_idx = 0;\n+ for (int i = 0; i < list.size(); i++) {\n+ if (list.get(i) == last) {\n+ loop_idx = i;\n+ }\n+ }\n+\n+ long ans = 0;\n+\n+ for (int i = 0; i < loop_idx; i++) {\n+ ans += list.get(i);\n+ }\n+ k -= loop_idx;\n+\n+ long loop_sum = 0;\n+ for (int i = loop_idx; i < list.size(); i++) {\n+ loop_sum += list.get(i);\n+ }\n+ long len = list.size() - loop_idx;\n+ long block = k / len;\n+ ans += loop_sum * block;\n+ k %= len;\n+\n+ for (int i = loop_idx; i < loop_idx + k; i++) {\n+ ans += list.get(i);\n+ }\n+\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.107", "pair_id": "java_5948_forward", "problem_id": "p02550", "language": "java", "direction": "forward", "speedup_ratio": 1.077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n- return st.nextToken();\n- }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "FASTER 0.05", "pair_id": "java_5801_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0353} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.IOException;\n import java.io.InputStreamReader;\n import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class newProgram5 {\n-\n- public static void main(String[] args) throws IOException {\n-\n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n }\n \n- static class FastIO {\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n \n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n-\n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "FASTER 0.845", "pair_id": "java_4692_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.7963} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n import java.util.Arrays;\n import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n+ Scanner in = new Scanner(System.in);\n \n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n+ int n = in.nextInt(), q = in.nextInt();\n+\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n+\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n+ }\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n- }\n-\n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n-\n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n }\n }\n \n-class IntDualSegmentTree {\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n \n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n }\n \n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n }\n \n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n-\n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n- }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n- }\n- }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- }\n }", "output": "SLOWER 0.3615", "pair_id": "java_5740_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.2848} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n Scanner sc = new Scanner(System.in);\n \n int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n \n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n \n sc.close();", "output": "SLOWER 0.0151", "pair_id": "java_7308_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 1.0105} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n }\n- System.out.println(sum);\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 4.9885", "pair_id": "java_175_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 31.7457} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class helloWorld {\n+public class Main {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n+ static class DMinimalnayaTriangulyaciya {\n \n- System.out.println(ans);\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n+ }\n+ }\n \n- in.close();\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.0961", "pair_id": "java_179_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 34.204} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+public class Main {\n+ static long mod = 1000000007;\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n+ }\n \n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n- }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ return r;\n }\n }\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+}", "output": "FASTER 6.3975", "pair_id": "java_4712_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 84.3} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n \n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+ public static void main(String[] args) {\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- }\n \n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n+ out.println(weight);\n \n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ in.close();\n+ out.close();\n }\n }", "output": "FASTER 0.1004", "pair_id": "java_219_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0721} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.StringTokenizer;\n \n-public class GFG {\n+public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n+ }\n+ }\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- pw.flush();\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "FASTER 0.9043", "pair_id": "java_5770_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.8716} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class ArrayA_300A {\n-\n- public static void main(String[] args) {\n-\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n- int arr[] = new int[n];\n+ int zeros = 0;\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n- arr[i] = sc.nextInt();\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println();\n+\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n+ }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n+\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n+ System.out.println();\n+\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n+ System.out.println();\n }\n }", "output": "FASTER 0.0837", "pair_id": "java_6831_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0597} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n+ pw.println(v2);\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.2894", "pair_id": "java_5804_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.2221} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n+ public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n- System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n+ int x = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+\n+ System.out.println((x - a) % b);\n }\n }", "output": "SLOWER 0.005", "pair_id": "java_6639_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0035} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class B {\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ private static long N;\n+ private static long LAST;\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n+\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n }\n+\n+ private static long number(long i, long j) {\n+\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n+ }\n }", "output": "SLOWER 0.8492", "pair_id": "java_5806_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.8015} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class EducationalRound49B {\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- public static void main(String[] args) {\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n }\n- q--;\n+ return new String(buf, 0, cnt);\n }\n- out.close();\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n }\n \n- public static PrintWriter out;\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ long ans = 0, end = 0;\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n- return st.nextToken();\n- }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n+ q--;\n }\n }\n }", "output": "SLOWER 0.0812", "pair_id": "java_5773_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0579} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.StringTokenizer;\n \n-public class second {\n+public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n }\n- pw.flush();\n+ }\n+\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "FASTER 1.1329", "pair_id": "java_5771_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.193} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.util.*;\n \n-public class B {\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- private static long N;\n- private static long LAST;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n-\n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- private static long number(long i, long j) {\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n+ }\n+ }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.6856", "pair_id": "java_5824_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.6084} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class triangulation {\n+public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n- out.println(sum);\n- out.close();\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.1092", "pair_id": "java_188_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0786} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.awt.Polygon;\n-import java.awt.geom.Area;\n+import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n }\n }\n \n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n \n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n- return false;\n }\n }", "output": "SLOWER 4.3122", "pair_id": "java_4738_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 19.8662} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n }\n }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n- }\n }", "output": "SLOWER 0.6939", "pair_id": "java_5768_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.6177} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n+import java.util.TreeMap;\n \n-public class R733_D {\n- public static void main(String[] args) {\n- InputReader in = new InputReader(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = in.nextInt();\n- int max = 0;\n- int k = 0;\n- int[] ans = new int[2];\n- int[][] recs = new int[n][3];\n- HashMap map = new HashMap<>();\n+public class ProblemD {\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt(), a[] = new int[3];\n+ int ans = 0, k[] = new int[2];\n+ TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n- recs[i][0] = in.nextInt();\n- recs[i][1] = in.nextInt();\n- recs[i][2] = in.nextInt();\n- Arrays.sort(recs[i]);\n- boolean toAdd1 = false;\n- boolean toAdd2 = false;\n- boolean toAdd3 = false;\n- if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][1]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][2] > recs[index][2]) {\n- toAdd1 = true;\n+ a[0] = sc.nextInt();\n+ a[1] = sc.nextInt();\n+ a[2] = sc.nextInt();\n+ Arrays.sort(a);\n+\n+ if (!map.containsKey(new Pair(a[1], a[2]))) {\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ if (ans < a[0]) {\n+ ans = a[0];\n+ k[0] = i;\n+ k[1] = -1;\n }\n } else {\n- toAdd1 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][1], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n+ Pair x = map.get(new Pair(a[1], a[2]));\n+ if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n+ ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n+ k[0] = x.first;\n+ k[1] = i;\n }\n- if (recs[i][0] > recs[index][0]) {\n- toAdd2 = true;\n+ if (x.second < a[0]) {\n+ map.remove(x);\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n- } else {\n- toAdd2 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][1] > recs[index][1]) {\n- toAdd3 = true;\n- }\n- } else {\n- toAdd3 = true;\n- }\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n- if (temp > max) {\n- max = temp;\n- k = 1;\n- ans[0] = i;\n- }\n- if (toAdd1) {\n- map.put(new Pair(recs[i][0], recs[i][1]), i);\n- }\n- if (toAdd2) {\n- map.put(new Pair(recs[i][1], recs[i][2]), i);\n- }\n- if (toAdd3) {\n- map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n- out.println(k);\n- for (int i = 0; i < k; i++) {\n- out.print((ans[i] + 1) + \" \");\n+\n+ if (k[1] == -1) {\n+ pw.println(1);\n+ pw.println(k[0] + 1);\n+ } else {\n+ pw.println(2);\n+ pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n- out.flush();\n+ pw.flush();\n+ pw.close();\n }\n \n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n+ static class Pair implements Comparable {\n+ int first, second;\n \n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n+ public Pair(int f, int s) {\n+ first = f;\n+ second = s;\n }\n \n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n+ @Override\n+ public int compareTo(Pair pair) {\n+ return first == pair.first ? second - pair.second : first - pair.first;\n }\n \n- public int nextInt() {\n+ public String toString() {\n+ return (\"First: \" + first + \" second: \" + second);\n+ }\n+ }\n+\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n+\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n \n- public double nextDouble() {\n- return Double.parseDouble(next());\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }\n-\n-class Pair {\n- int x;\n- int y;\n-\n- Pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n- }\n-\n- @Override\n- public int hashCode() {\n- return (x + y + 1) * (x + y) / 2 + y;\n- }\n-}", "output": "SLOWER 0.0839", "pair_id": "java_9722_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0599} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class helloWorld {\n+public class JavaApplication42 {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n \n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n- System.out.println(ans);\n-\n- in.close();\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n+ }\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.0228", "pair_id": "java_205_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0159} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class ProblemD {\n-\n+public class triangulation {\n public static void main(String[] args) {\n-\n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n+ }\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "SLOWER 0.0349", "pair_id": "java_195_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0245} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n-\n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n-\n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n- }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "FASTER 3.9341", "pair_id": "java_4752_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 15.2856} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.InputStream;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n out.close();\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n-\n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n- return false;\n }\n+ return true;\n }\n \n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 5.9867", "pair_id": "java_4700_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 63.4136} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.util.*;\n \n-public class MyClass {\n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+public class Main {\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n }\n- System.out.println(ans);\n+ }\n+\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1058", "pair_id": "java_218_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0761} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n-\n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n }\n }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n \n- long ans = 0, end = 0;\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- q--;\n+ public long nextLong() {\n+ return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.0918", "pair_id": "java_5763_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0657} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+ private static final boolean debug = false;\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n- }\n-\n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ System.out.println(solve(x, y, n));\n }\n }\n+\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n+\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n+ }\n+ }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n+ }\n }", "output": "SLOWER 0.1635", "pair_id": "java_5803_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.12} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.*;\n+import java.util.*;\n \n-public class newProgram5 {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n+ }\n \n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n+ pair a[][] = new pair[2][4];\n \n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n }\n \n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n }\n \n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public String next() throws IOException {\n- return nextToken();\n+ public long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 1.0915", "pair_id": "java_4724_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class Main {\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n-\n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n- }\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "FASTER 0.079", "pair_id": "java_5802_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0563} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- private static long N;\n- private static long LAST;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- LAST = N * N / 2 + (N & 1);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n+ return str;\n+ }\n+ }\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n }\n }\n }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n- }\n }", "output": "FASTER 0.7992", "pair_id": "java_5817_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n+\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n }\n- System.out.println(Math.max(count1, count2));\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7548", "pair_id": "java_7305_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 107.9911} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class R181D2A {\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int zeros = 0;\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n+ for (int i = 0; i < n; i++) {\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n+ }\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n+ }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n+\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else {\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ }\n+ System.out.println();\n+\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n+ System.out.println();\n }\n }\n-\n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n- }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- }\n-}", "output": "SLOWER 0.0114", "pair_id": "java_6827_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0079} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n+import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.InputStreamReader;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- static class TaskAdapter implements Runnable {\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n- out.println(\"NO\");\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n }\n \n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n }\n }\n \n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n \n- public FastInput(InputStream is) {\n- this.is = is;\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- bufLen = is.read(buf);\n+ st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n+ e.printStackTrace();\n }\n }\n- return buf[bufOffset++];\n+ return st.nextToken();\n }\n \n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n+ String nextLine() {\n+ String str = \"\";\n try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n+ str = br.readLine();\n } catch (IOException e) {\n- throw new UncheckedIOException(e);\n+ e.printStackTrace();\n }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n+ return str;\n }\n }\n }", "output": "SLOWER 1.6094", "pair_id": "java_4747_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.0513} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.HashMap;\n-import java.util.Random;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n+ Scanner sc = new Scanner(System.in);\n+ int N = Integer.parseInt(sc.next());\n+ String S = sc.next();\n+ StringBuilder sb = new StringBuilder(S);\n+ int ans = 0;\n+ for (int i = 0; i < S.length(); i++) {\n+ String S_tmp = sb.substring(i);\n+ int[] z = z_algo(S_tmp);\n \n- int N = scanner.nextInt();\n- char[] s = scanner.next().toCharArray();\n- int[] M = {999_999_937, 1_000_000_007};\n- int B = new Random().nextInt(999_999_937);\n- int left = 0;\n- int right = N / 2 + 1;\n- while (right - left > 1) {\n- int mid = (left + right) / 2;\n- if (possible(s, mid, N, B, M)) left = mid;\n- else right = mid;\n+ for (int j = 1; j < S.length() - i; j++) {\n+ if (j >= z[j]) {\n+ ans = Math.max(ans, z[j]);\n+ }\n+ }\n }\n- System.out.println(left);\n+ System.out.println(ans);\n }\n \n- private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n- long[] bn = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- bn[i] = 1;\n- for (int j = 0; j < K - 1; j++) {\n- bn[i] *= B;\n- bn[i] %= M[i];\n+ public static int[] z_algo(String S) {\n+ int N = S.length();\n+ int[] A = new int[N];\n+ A[0] = N;\n+ int i = 1;\n+ int j = 0;\n+ while (i < N) {\n+ while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n+ j++;\n }\n+ A[i] = j;\n+ if (j == 0) {\n+ i++;\n+ continue;\n+ }\n+ int k = 1;\n+ while (i + k < N && k + A[k] < j) {\n+ A[i + k] = A[k];\n+ k++;\n+ }\n+ i += k;\n+ j -= k;\n }\n-\n- HashMap occurrences = new HashMap<>();\n- long[] hash = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- hash[i] = hash(s, K, B, M[i]);\n- }\n- occurrences.put(new Tuple(hash), 0);\n- for (int i = 1; i <= N - K; i++) {\n- for (int j = 0; j < M.length; j++) {\n- hash[j] -= s[i - 1] * bn[j] % M[j];\n- if (hash[j] < 0) hash[j] += M[j];\n- hash[j] *= B;\n- hash[j] %= M[j];\n- hash[j] += s[i + K - 1];\n- if (hash[j] >= M[j]) hash[j] -= M[j];\n- }\n- Tuple key = new Tuple(hash);\n- if (occurrences.containsKey(key)) {\n- if (occurrences.get(key) + K <= i) return true;\n- } else occurrences.put(key, i);\n- }\n- return false;\n- }\n-\n- private static long hash(char[] s, int len, int B, int M) {\n- if (s.length < len)\n- throw new IllegalArgumentException(\n- \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n- long hash = 0;\n- for (int i = 0; i < len; i++) {\n- hash *= B;\n- hash %= M;\n- hash += s[i];\n- if (hash >= M) hash -= M;\n- }\n- return hash;\n- }\n-\n- private static class Tuple {\n- private final long[] elements;\n-\n- private Tuple(long[] elements) {\n- this.elements = Arrays.copyOf(elements, elements.length);\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Tuple tuple = (Tuple) o;\n- return Arrays.equals(elements, tuple.elements);\n- }\n-\n- @Override\n- public int hashCode() {\n- return Arrays.hashCode(elements);\n- }\n+ return A;\n }\n }", "output": "SLOWER 0.2965", "pair_id": "java_3835_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.2282} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static HashMap map;\n- static HashMap pos;\n-\n- static void update(long value, int temp, int i) {\n- if (!map.containsKey(value)) {\n- map.put(value, temp);\n- pos.put(value, i);\n- } else {\n- int val = map.get(value);\n- if (temp > val) {\n- map.put(value, temp);\n- pos.put(value, i);\n+public class R733_D {\n+ public static void main(String[] args) {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = in.nextInt();\n+ int max = 0;\n+ int k = 0;\n+ int[] ans = new int[2];\n+ int[][] recs = new int[n][3];\n+ HashMap map = new HashMap<>();\n+ for (int i = 0; i < n; i++) {\n+ recs[i][0] = in.nextInt();\n+ recs[i][1] = in.nextInt();\n+ recs[i][2] = in.nextInt();\n+ Arrays.sort(recs[i]);\n+ boolean toAdd1 = false;\n+ boolean toAdd2 = false;\n+ boolean toAdd3 = false;\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][1]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][2] > recs[index][2]) {\n+ toAdd1 = true;\n+ }\n+ } else {\n+ toAdd1 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][1], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][0] > recs[index][0]) {\n+ toAdd2 = true;\n+ }\n+ } else {\n+ toAdd2 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][1] > recs[index][1]) {\n+ toAdd3 = true;\n+ }\n+ } else {\n+ toAdd3 = true;\n+ }\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 1;\n+ ans[0] = i;\n+ }\n+ if (toAdd1) {\n+ map.put(new Pair(recs[i][0], recs[i][1]), i);\n+ }\n+ if (toAdd2) {\n+ map.put(new Pair(recs[i][1], recs[i][2]), i);\n+ }\n+ if (toAdd3) {\n+ map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n+ out.println(k);\n+ for (int i = 0; i < k; i++) {\n+ out.print((ans[i] + 1) + \" \");\n+ }\n+ out.flush();\n }\n \n- static int det(long temp) {\n- if (!map.containsKey(temp)) return 0;\n- return map.get(temp);\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+ }\n+}\n+\n+class Pair {\n+ int x;\n+ int y;\n+\n+ Pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- public static void main(String[] args) throws Exception {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- int n = Integer.parseInt(br.readLine());\n- StringTokenizer st;\n- map = new HashMap<>();\n- pos = new HashMap<>();\n- long mod = (long) 1E9 + 7;\n- int ans = 0;\n- int single = -1;\n- int next = -1;\n- int postemp = -1;\n- for (int i = 1; i <= n; i++) {\n- st = new StringTokenizer(br.readLine());\n- int a = Integer.parseInt(st.nextToken());\n- int b = Integer.parseInt(st.nextToken());\n- int c = Integer.parseInt(st.nextToken());\n- int min = Math.min(a, Math.min(b, c));\n- if (ans < min) {\n- ans = min;\n- single = i;\n- next = -1;\n- }\n- int val = det(Math.min(a, b) * mod + Math.max(a, b));\n- if (val > 0) {\n- postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n- val = Math.min(a, Math.min(b, val + c));\n- if (ans < val) {\n- ans = val;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n- if (val1 > 0) {\n- postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n- val1 = Math.min(a, Math.min(c, b + val1));\n- if (ans < val1) {\n- ans = val1;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n- if (val2 > 0) {\n- postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n- val2 = Math.min(b, Math.min(c, a + val2));\n- if (ans < val2) {\n- ans = val2;\n- single = i;\n- next = postemp;\n- }\n- }\n- update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n- update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n- update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n- }\n- if (next == -1) {\n- System.out.println(\"1\");\n- System.out.println(single);\n- return;\n- }\n- System.out.println(\"2\");\n- System.out.println(single + \" \" + next);\n+ @Override\n+ public boolean equals(Object obj) {\n+ return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return (x + y + 1) * (x + y) / 2 + y;\n }\n }", "output": "SLOWER 0.6477", "pair_id": "java_9720_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.5667} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n+\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n }\n \n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n+ }\n \n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 5.331", "pair_id": "java_4699_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 40.252} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(p);\n }\n }", "output": "SLOWER 5.0714", "pair_id": "java_177_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 33.6238} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- private static Scanner sc;\n- private static Printer pr;\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n+ }\n+ }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n \n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n \n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n+class IntDualSegmentTree {\n \n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n+ final int[] Dat;\n \n- pr.println(ruq.find(index));\n- pr.flush();\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n+ }\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n-\n- static final int NULL = -1;\n-\n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n-\n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n }\n }\n+ propagate(k);\n+ return Dat[k - N];\n+ }\n \n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n+ }\n+\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n- return data[index];\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n+ Laz[k] = E1;\n }\n }\n \n public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n-\n- solve();\n-\n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n- }\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "SLOWER 0.9388", "pair_id": "java_5730_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.9169} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+public class Main {\n+ static long mod = 1000000007;\n+\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n }\n for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n+\n+ return r;\n+ }\n+}\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n }\n \n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "SLOWER 0.2533", "pair_id": "java_4690_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.1919} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.Arrays;\n+import java.util.NoSuchElementException;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n+public class Main {\n+ public static class SegmentTree {\n+ int[] tree;\n \n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n+\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n+\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ }\n+ }\n+\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n+\n+ public int query(int a, int b, int k, int l, int r) {\n+\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n+\n } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n }\n }\n }\n \n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n+ }\n+\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n }\n }", "output": "FASTER 1.6783", "pair_id": "java_5726_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 3.2004} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class MyClass {\n+public class Main {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n }\n- System.out.println(ans);\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.099", "pair_id": "java_181_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 34.2722} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class ShellGame {\n+public class A5 {\n public static void main(String[] args) {\n- Scanner nw = new Scanner(System.in);\n- int n = nw.nextInt();\n- int pos = nw.nextInt();\n- String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n- (n) %= elm.length;\n- System.out.println(elm[n].charAt(pos));\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextLong();\n+ int x = in.nextInt();\n+ int[] a = new int[] {0, 0, 0};\n+ a[x] = 1;\n+ n %= 6;\n+\n+ for (long i = n; i > 0; --i) {\n+ if (i % 2 == 1) {\n+ int t = a[0];\n+ a[0] = a[1];\n+ a[1] = t;\n+ } else {\n+ int t = a[1];\n+ a[1] = a[2];\n+ a[2] = t;\n+ }\n+ }\n+ System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "FASTER 0.1835", "pair_id": "java_418_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.1356} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n- public static void main(String[] z) {\n- Scanner s = new Scanner(System.in);\n- for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n- m = s.nextInt();\n- Map a = new HashMap();\n- for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n- for (r = 0; m-- > 0; ) {\n- String x = s.next();\n- for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n+public class Main {\n+ static boolean check(char[] a, char[] b) {\n+ for (int i = 0; i < 8; i++) {\n+ if (a[i] != b[i] && a[i] != '*') return false;\n+ }\n+ return true;\n+ }\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+\n+ if (n == 0 && m == 0) break;\n+\n+ int money[] = new int[n];\n+ int hit = 0;\n+ String[] str1 = new String[n];\n+ String[] str2 = new String[m];\n+ char[][] a = new char[n][];\n+ char[][] b = new char[m][];\n+\n+ for (int i = 0; i < n; i++) {\n+ str1[i] = sc.next();\n+ a[i] = str1[i].toCharArray();\n+ money[i] = sc.nextInt();\n }\n+ for (int i = 0; i < m; i++) {\n+ str2[i] = sc.next();\n+ b[i] = str2[i].toCharArray();\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ if (check(a[i], b[j])) hit += money[i];\n+ }\n+ }\n+\n+ System.out.println(hit);\n }\n }\n }", "output": "FASTER 1.5245", "pair_id": "java_1000_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.8768} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n+public class helloWorld {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n \n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n \n- static class DMinimalnayaTriangulyaciya {\n+ System.out.println(ans);\n \n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n- }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ in.close();\n }\n }", "output": "SLOWER 5.0961", "pair_id": "java_179_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 34.204} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = Integer.parseInt(sc.next());\n+ int N = sc.nextInt();\n String S = sc.next();\n- StringBuilder sb = new StringBuilder(S);\n- int ans = 0;\n- for (int i = 0; i < S.length(); i++) {\n- String S_tmp = sb.substring(i);\n- int[] z = z_algo(S_tmp);\n-\n- for (int j = 1; j < S.length() - i; j++) {\n- if (j >= z[j]) {\n- ans = Math.max(ans, z[j]);\n- }\n+ sc.close();\n+ int r = -1;\n+ String s = \"\";\n+ long ans = 0;\n+ for (int l = 0; l < N; l++) {\n+ while (l - 1 > r) {\n+ r++;\n }\n+ while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n+ s += S.charAt(r + 1);\n+ r++;\n+ }\n+ ans = Math.max(r - l + 1, ans);\n+ if (s.length() >= 2) s = s.substring(1);\n+ else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n-\n- public static int[] z_algo(String S) {\n- int N = S.length();\n- int[] A = new int[N];\n- A[0] = N;\n- int i = 1;\n- int j = 0;\n- while (i < N) {\n- while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n- j++;\n- }\n- A[i] = j;\n- if (j == 0) {\n- i++;\n- continue;\n- }\n- int k = 1;\n- while (i + k < N && k + A[k] < j) {\n- A[i + k] = A[k];\n- k++;\n- }\n- i += k;\n- j -= k;\n- }\n- return A;\n- }\n }", "output": "SLOWER 0.0068", "pair_id": "java_3837_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.0047} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n+import java.io.Closeable;\n import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.*;\n-\n-public class C {\n- static class Point {\n- int x, y;\n-\n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ return cache.toString();\n }\n }\n }", "output": "FASTER 1.6094", "pair_id": "java_4747_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.0513} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.StringTokenizer;\n \n-public class GFG {\n+public class EducationalRound49B {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- pw.flush();\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "FASTER 0.8936", "pair_id": "java_5780_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.8578} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n+import java.util.NoSuchElementException;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n+ public static class SegmentTree {\n+ int[] tree;\n \n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n+\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n+\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n+\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n+\n+ public int query(int a, int b, int k, int l, int r) {\n+\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n+ }\n }\n \n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n+ public static void main(String[] args) {\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n \n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n- }\n-}\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n+ } else {\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n }\n }\n }\n \n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n+\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n+ }\n+\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n- }\n- }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "FASTER 1.2175", "pair_id": "java_5724_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.3255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Test {\n+public class Codechef {\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner sc = new Scanner(System.in);\n+ int noOfMoves = sc.nextInt();\n+ int index = sc.nextInt();\n \n- public static void main(String[] args) throws Exception {\n- int[] nums0 = {1, 2, 2, 1, 0, 0};\n- int[] nums1 = {0, 0, 1, 2, 2, 1};\n+ int position = index;\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int current = sc.nextInt();\n- int rem = n - (n / 6) * 6;\n- if (rem == 0) {\n- System.out.println(current);\n- } else {\n- if (nums0[rem - 1] == current) {\n- System.out.println(\"0\");\n- } else if (nums1[rem - 1] == current) {\n- System.out.println(\"1\");\n+ for (int i = noOfMoves % 6; i >= 1; i--) {\n+ if (i % 2 == 0) {\n+ if (position == 2) position = 1;\n+ else if (position == 1) position = 2;\n } else {\n- System.out.println(\"2\");\n+ if (position == 1) position = 0;\n+ else if (position == 0) position = 1;\n }\n }\n+\n+ System.out.println(position);\n }\n }", "output": "FASTER 0.0813", "pair_id": "java_421_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n+import java.io.BufferedInputStream;\n import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class B {\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ static long N;\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n+ }\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n }\n \n- pw.close();\n- }\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n \n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n \n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n \n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n \n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n \n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n+ }\n }\n }", "output": "SLOWER 0.1598", "pair_id": "java_5753_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1171} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- static boolean check(char[] a, char[] b) {\n- for (int i = 0; i < 8; i++) {\n- if (a[i] != b[i] && a[i] != '*') return false;\n- }\n- return true;\n- }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n-\n if (n == 0 && m == 0) break;\n \n- int money[] = new int[n];\n- int hit = 0;\n- String[] str1 = new String[n];\n- String[] str2 = new String[m];\n- char[][] a = new char[n][];\n- char[][] b = new char[m][];\n+ String[] a = new String[n];\n+ int[] b = new int[n];\n \n for (int i = 0; i < n; i++) {\n- str1[i] = sc.next();\n- a[i] = str1[i].toCharArray();\n- money[i] = sc.nextInt();\n- }\n- for (int i = 0; i < m; i++) {\n- str2[i] = sc.next();\n- b[i] = str2[i].toCharArray();\n+ a[i] = sc.next();\n+ b[i] = sc.nextInt();\n }\n \n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- if (check(a[i], b[j])) hit += money[i];\n+ int sum = 0;\n+ int c = 0;\n+ String s = \"\";\n+\n+ for (int i = 0; i < m; i++) {\n+ s = sc.next();\n+ for (int j = 0; j < n; j++) {\n+ c = 0;\n+ while (a[j].codePointAt(c) == 42) c++;\n+ if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n-\n- System.out.println(hit);\n+ System.out.println(sum);\n }\n }\n }", "output": "SLOWER 0.186", "pair_id": "java_998_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 1.1376} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(sum);\n }\n }", "output": "SLOWER 4.9885", "pair_id": "java_175_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 31.7457} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static long mod = 1000000007;\n-\n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- return r;\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 5.068", "pair_id": "java_4709_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 33.5438} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- solve3027();\n- }\n-\n- public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n-\n- int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n-\n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n- System.out.println(ans);\n-\n- sc.close();\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n+ }\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "SLOWER 0.0144", "pair_id": "java_7307_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 1.01} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n- System.out.println(p);\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.083", "pair_id": "java_185_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0592} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n+ static long mod = 1000000007;\n+\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n+ return r;\n+ }\n+}\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 5.7335", "pair_id": "java_4711_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 53.2039} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n-\n- System.out.println(solve(x, y, n));\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n }\n+ return st.nextToken();\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "FASTER 0.7785", "pair_id": "java_5769_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7153} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+ static int N = 300005;\n+ static int tree[];\n \n public static void main(String[] args) {\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n+ }\n \n- Scanner sc = new Scanner(System.in);\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n+ }\n+ if (nMax == 1) nMax = 2;\n \n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n- init(n1);\n- arr = new int[op_num];\n-\n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n- i1++;\n- mark++;\n }\n }\n \n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n }\n \n- public static void update(int a, int b, int k, int l, int r, int mark) {\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n \n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n- }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n+ if (x > right || y < left) return;\n \n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n+ }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "SLOWER 0.0647", "pair_id": "java_5749_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.0459} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- }\n-\n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.1333", "pair_id": "java_204_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0968} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class ShellGame {\n+public class TaskC {\n+\n public static void main(String[] args) {\n- Scanner nw = new Scanner(System.in);\n- int n = nw.nextInt();\n- int pos = nw.nextInt();\n- String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n- (n) %= elm.length;\n- System.out.println(elm[n].charAt(pos));\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int[] arr = {0, 0, 0};\n+ int x = sc.nextInt();\n+ arr[x] = 1;\n+ int i = 0;\n+ for (i = n; i > 0 && arr[1] != 1; i--) {\n+ if (i % 2 == 0) {\n+ int t = arr[1];\n+ arr[1] = arr[2];\n+ arr[2] = t;\n+ } else {\n+ int t = arr[0];\n+ arr[0] = arr[1];\n+ arr[1] = t;\n+ }\n+ }\n+ if (i == 0) {\n+ for (int j = 0; j < 3; j++) {\n+ if (arr[j] == 1) {\n+ System.out.println(j);\n+ break;\n+ }\n+ }\n+ } else {\n+ if (i % 2 == 0) {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(2);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(0);\n+ }\n+ } else {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(0);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(2);\n+ }\n+ }\n+ }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.1388", "pair_id": "java_425_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.101} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n-\n- init(n1);\n- arr = new int[op_num];\n-\n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n- i1++;\n- mark++;\n }\n }\n \n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n- }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n- }\n-\n- public static void update(int a, int b, int k, int l, int r, int mark) {\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n- }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n-\n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "FASTER 0.0062", "pair_id": "java_5747_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.0043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class CF300A {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n- int zeros = 0;\n- int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n+ for (int i = 0; i < n; i++) {\n \n- for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n- }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n+ x[i] = Integer.parseInt(st.nextToken());\n+\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n }\n \n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n+ }\n+ }\n+ } else {\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n break;\n }\n }\n- }\n-\n- int[] num = new int[n];\n-\n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n }\n }", "output": "FASTER 1.736", "pair_id": "java_6812_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.3311} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class Main {\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n+ }\n }\n }\n-\n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n }", "output": "SLOWER 0.7048", "pair_id": "java_5757_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.6299} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n-\n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n-\n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n- }\n-\n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n }\n }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "SLOWER 4.6015", "pair_id": "java_4718_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 24.2759} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n }\n \n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n \n- public void close() throws IOException {\n- bw.close();\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n- static class FastReader {\n+ static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n try {\n- st = new StringTokenizer(br.readLine());\n+ s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n \n- int nextInt() {\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- long nextLong() {\n+ public long nextLong() {\n return Long.parseLong(next());\n }\n \n- double nextDouble() {\n+ public double nextDouble() {\n return Double.parseDouble(next());\n }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n }\n }", "output": "SLOWER 1.2386", "pair_id": "java_4715_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.3597} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n-\n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n-\n- System.out.println(solve(x, y, n));\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n- }\n-\n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+ pw.flush();\n }\n }", "output": "SLOWER 0.3545", "pair_id": "java_5823_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.2785} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class EducationalRound49B {\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ public static void main(String[] args) {\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n+ q--;\n+ }\n+ out.close();\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n }", "output": "FASTER 0.6043", "pair_id": "java_5775_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5202} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n\n static int mod = (int) 998244353;\n static List> list = new ArrayList>();\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n long N = sc.nextLong();\n long X = sc.nextInt();\n int M = sc.nextInt();\n\n int[] m = new int[M];\n int[] v = new int[M];\n int s = 0;\n int t = 0;\n long ans = 0;\n if (X == 0) {\n System.out.println(0);\n return;\n }\n boolean flg = false;\n for (int i = 0; i < N; i++) {\n m[i] = (int) (X) % M;\n if (v[m[i]] == 0) {\n v[(int) m[i]] = i;\n } else {\n s = v[m[i]];\n t = i;\n flg = true;\n break;\n }\n ans = ans + m[i];\n X = (X * X) % M;\n }\n\n int d = 0;\n long w = 0;\n int x = 0;\n if (flg) {\n N = N - t;\n d = t - s;\n if (d != 0) w = N / d;\n else w = N;\n if (d != 0) x = (int) (N % d);\n else x = 0;\n }\n X = m[s];\n long sum = 0;\n long[] o = new long[M];\n for (int i = 0; i < d; i++) {\n o[i] = sum + (X) % M;\n X = (X * X) % M;\n sum = o[i];\n }\n\n ans = ans + (w * sum);\n if (x != 0) {\n ans = ans + o[x - 1];\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner scanner = new Scanner(System.in)) {\n long n = scanner.nextLong();\n int x = scanner.nextInt(), m = scanner.nextInt();\n List list = new ArrayList<>();\n\n Set set = new HashSet<>();\n long next = x % m;\n list.add(next);\n set.add(next);\n while (list.size() < n) {\n next = next * next % m;\n if (set.contains(next)) {\n break;\n }\n set.add(next);\n list.add(next);\n }\n if (list.size() == n) {\n\n System.out.println(list.stream().mapToLong(i -> i).sum());\n } else {\n\n int start = list.indexOf(next);\n\n long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n\n long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n\n long bai = (n - start) / (list.size() - start);\n\n long remain = (n - start) % (list.size() - start);\n System.out.println(\n startSum\n + bai * loop\n + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n-class Main {\n-\n- static int mod = (int) 998244353;\n- static List> list = new ArrayList>();\n+public class Main {\n \n public static void main(String[] args) {\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ long n = scanner.nextLong();\n+ int x = scanner.nextInt(), m = scanner.nextInt();\n+ List list = new ArrayList<>();\n \n- Scanner sc = new Scanner(System.in);\n- long N = sc.nextLong();\n- long X = sc.nextInt();\n- int M = sc.nextInt();\n+ Set set = new HashSet<>();\n+ long next = x % m;\n+ list.add(next);\n+ set.add(next);\n+ while (list.size() < n) {\n+ next = next * next % m;\n+ if (set.contains(next)) {\n+ break;\n+ }\n+ set.add(next);\n+ list.add(next);\n+ }\n+ if (list.size() == n) {\n \n- int[] m = new int[M];\n- int[] v = new int[M];\n- int s = 0;\n- int t = 0;\n- long ans = 0;\n- if (X == 0) {\n- System.out.println(0);\n- return;\n+ System.out.println(list.stream().mapToLong(i -> i).sum());\n+ } else {\n+\n+ int start = list.indexOf(next);\n+\n+ long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n+\n+ long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n+\n+ long bai = (n - start) / (list.size() - start);\n+\n+ long remain = (n - start) % (list.size() - start);\n+ System.out.println(\n+ startSum\n+ + bai * loop\n+ + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n+ }\n }\n- boolean flg = false;\n- for (int i = 0; i < N; i++) {\n- m[i] = (int) (X) % M;\n- if (v[m[i]] == 0) {\n- v[(int) m[i]] = i;\n- } else {\n- s = v[m[i]];\n- t = i;\n- flg = true;\n- break;\n- }\n- ans = ans + m[i];\n- X = (X * X) % M;\n- }\n-\n- int d = 0;\n- long w = 0;\n- int x = 0;\n- if (flg) {\n- N = N - t;\n- d = t - s;\n- if (d != 0) w = N / d;\n- else w = N;\n- if (d != 0) x = (int) (N % d);\n- else x = 0;\n- }\n- X = m[s];\n- long sum = 0;\n- long[] o = new long[M];\n- for (int i = 0; i < d; i++) {\n- o[i] = sum + (X) % M;\n- X = (X * X) % M;\n- sum = o[i];\n- }\n-\n- ans = ans + (w * sum);\n- if (x != 0) {\n- ans = ans + o[x - 1];\n- }\n-\n- System.out.println(ans);\n }\n }", "output": "SLOWER 0.14", "pair_id": "java_5947_reversed", "problem_id": "p02550", "language": "java", "direction": "reversed", "speedup_ratio": 1.1019} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class B {\n-\n- private static long N;\n- private static long LAST;\n+public class EducationalRound49B {\n \n public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n \n- LAST = N * N / 2 + (N & 1);\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n }\n+ return st.nextToken();\n+ }\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n }\n+ return str;\n }\n }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n- }\n }", "output": "FASTER 1.4535", "pair_id": "java_5782_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.7387} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class TaskC {\n+public class A5 {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextLong();\n+ int x = in.nextInt();\n+ int[] a = new int[] {0, 0, 0};\n+ a[x] = 1;\n+ n %= 6;\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int[] arr = {0, 0, 0};\n- int x = sc.nextInt();\n- arr[x] = 1;\n- int i = 0;\n- for (i = n; i > 0 && arr[1] != 1; i--) {\n- if (i % 2 == 0) {\n- int t = arr[1];\n- arr[1] = arr[2];\n- arr[2] = t;\n+ for (long i = n; i > 0; --i) {\n+ if (i % 2 == 1) {\n+ int t = a[0];\n+ a[0] = a[1];\n+ a[1] = t;\n } else {\n- int t = arr[0];\n- arr[0] = arr[1];\n- arr[1] = t;\n+ int t = a[1];\n+ a[1] = a[2];\n+ a[2] = t;\n }\n }\n- if (i == 0) {\n- for (int j = 0; j < 3; j++) {\n- if (arr[j] == 1) {\n- System.out.println(j);\n- break;\n- }\n- }\n- } else {\n- if (i % 2 == 0) {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(2);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(0);\n- }\n- } else {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(0);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(2);\n- }\n- }\n- }\n-\n- sc.close();\n+ System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "FASTER 0.0446", "pair_id": "java_416_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0314} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ACircleMetro solver = new ACircleMetro();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ACircleMetro {\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int a = in.nextInt();\n int x = in.nextInt();\n int b = in.nextInt();\n int y = in.nextInt();\n boolean flag = false;\n while (a != x && b != y) {\n if (a == n) a = 1;\n else a++;\n if (b == 1) b = n;\n else b--;\n if (a == b) {\n flag = true;\n break;\n }\n }\n if (flag) out.println(\"YES\");\n else out.println(\"NO\");\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int x = sc.nextInt();\n int b = sc.nextInt();\n int y = sc.nextInt();\n int t1 = 0, t2 = 0;\n int count = 0, count1, count2;\n for (int i = 0; i < n * 20; i++) {\n count1 = 0;\n count2 = 0;\n if (a == b && t1 == t2) {\n count = 1;\n System.out.println(\"YES\");\n break;\n }\n if (a == x || b == y) break;\n if (a < n) a++;\n else a = 1;\n if (b > 1) b--;\n else b = n;\n t1++;\n t2++;\n }\n if (count == 0) System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ACircleMetro solver = new ACircleMetro();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class ACircleMetro {\n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int a = in.nextInt();\n- int x = in.nextInt();\n- int b = in.nextInt();\n- int y = in.nextInt();\n- boolean flag = false;\n- while (a != x && b != y) {\n- if (a == n) a = 1;\n- else a++;\n- if (b == 1) b = n;\n- else b--;\n- if (a == b) {\n- flag = true;\n- break;\n- }\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int x = sc.nextInt();\n+ int b = sc.nextInt();\n+ int y = sc.nextInt();\n+ int t1 = 0, t2 = 0;\n+ int count = 0, count1, count2;\n+ for (int i = 0; i < n * 20; i++) {\n+ count1 = 0;\n+ count2 = 0;\n+ if (a == b && t1 == t2) {\n+ count = 1;\n+ System.out.println(\"YES\");\n+ break;\n }\n- if (flag) out.println(\"YES\");\n- else out.println(\"NO\");\n+ if (a == x || b == y) break;\n+ if (a < n) a++;\n+ else a = 1;\n+ if (b > 1) b--;\n+ else b = n;\n+ t1++;\n+ t2++;\n }\n+ if (count == 0) System.out.println(\"NO\");\n }\n }", "output": "FASTER 0.0095", "pair_id": "java_5830_forward", "problem_id": "1169_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0066} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class ProblemD {\n \n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n- }\n- }\n+ public static void main(String[] args) {\n \n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.1421", "pair_id": "java_198_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.1035} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n \n- pw.flush();\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n+ }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.9151", "pair_id": "java_5759_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.8857} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static long mod = 1000000007;\n-\n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n }\n }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n+ }\n+\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n }\n- pw.print(ans);\n- pw.flush();\n+ return true;\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n \n- return r;\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n+\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "FASTER 0.2533", "pair_id": "java_4690_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.1919} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n- }\n- }\n- }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public String next() {\n+ String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n- public int nextInt() {\n+ int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ long nextLong() {\n return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n }\n }\n }", "output": "SLOWER 0.6649", "pair_id": "java_5767_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5855} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Test {\n+public class Main {\n+ static long mod = 1000000007;\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n-\n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n }\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n- }\n+ return r;\n+ }\n+}\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n }\n \n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 5.0461", "pair_id": "java_4708_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 33.0399} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.251", "pair_id": "java_5810_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.19} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class helloWorld {\n+public class ProblemD {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n \n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n- System.out.println(ans);\n-\n- in.close();\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0334", "pair_id": "java_194_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0234} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n+ int N = Integer.parseInt(sc.next());\n String S = sc.next();\n- sc.close();\n- int r = -1;\n- String s = \"\";\n- long ans = 0;\n- for (int l = 0; l < N; l++) {\n- while (l - 1 > r) {\n- r++;\n+ StringBuilder sb = new StringBuilder(S);\n+ int ans = 0;\n+ for (int i = 0; i < S.length(); i++) {\n+ String S_tmp = sb.substring(i);\n+ int[] z = z_algo(S_tmp);\n+\n+ for (int j = 1; j < S.length() - i; j++) {\n+ if (j >= z[j]) {\n+ ans = Math.max(ans, z[j]);\n+ }\n }\n- while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n- s += S.charAt(r + 1);\n- r++;\n- }\n- ans = Math.max(r - l + 1, ans);\n- if (s.length() >= 2) s = s.substring(1);\n- else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n+\n+ public static int[] z_algo(String S) {\n+ int N = S.length();\n+ int[] A = new int[N];\n+ A[0] = N;\n+ int i = 1;\n+ int j = 0;\n+ while (i < N) {\n+ while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n+ j++;\n+ }\n+ A[i] = j;\n+ if (j == 0) {\n+ i++;\n+ continue;\n+ }\n+ int k = 1;\n+ while (i + k < N && k + A[k] < j) {\n+ A[i + k] = A[k];\n+ k++;\n+ }\n+ i += k;\n+ j -= k;\n+ }\n+ return A;\n+ }\n }", "output": "FASTER 0.0068", "pair_id": "java_3837_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.0047} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ static boolean check(char[] a, char[] b) {\n+ for (int i = 0; i < 8; i++) {\n+ if (a[i] != b[i] && a[i] != '*') return false;\n+ }\n+ return true;\n+ }\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n \n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n+\n if (n == 0 && m == 0) break;\n \n- HashMap map = new HashMap();\n+ int money[] = new int[n];\n+ int hit = 0;\n+ String[] str1 = new String[n];\n+ String[] str2 = new String[m];\n+ char[][] a = new char[n][];\n+ char[][] b = new char[m][];\n+\n for (int i = 0; i < n; i++) {\n- String s = sc.next().replace(\"*\", \".\");\n- int price = sc.nextInt();\n- map.put(s, price);\n+ str1[i] = sc.next();\n+ a[i] = str1[i].toCharArray();\n+ money[i] = sc.nextInt();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ str2[i] = sc.next();\n+ b[i] = str2[i].toCharArray();\n }\n \n- int ans = 0;\n- for (int i = 0; i < m; i++) {\n- String x = sc.next();\n- for (String s : map.keySet()) {\n- if (x.matches(s)) {\n- ans += map.get(s);\n- break;\n- }\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ if (check(a[i], b[j])) hit += money[i];\n }\n }\n \n- System.out.println(ans);\n+ System.out.println(hit);\n }\n }\n }", "output": "FASTER 1.3026", "pair_id": "java_999_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.4667} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n+public class ArrayA_300A {\n+\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n+ int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n+ arr[i] = sc.nextInt();\n }\n-\n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println();\n+ } else {\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n- System.out.println();\n-\n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n- }\n- System.out.println();\n-\n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n }\n }", "output": "SLOWER 0.0837", "pair_id": "java_6831_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0597} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n import java.util.StringTokenizer;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n }\n \n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n }\n \n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n \n for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n \n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 0.9765", "pair_id": "java_4714_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.9677} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class R181D2A {\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n+ for (int i = 0; i < n; i++) {\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ x[i] = Integer.parseInt(st.nextToken());\n+\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n+ }\n+\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n+ }\n+ }\n+ } else {\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n+ break;\n+ }\n+ }\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ }\n+ }\n }\n }\n-\n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n- }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- }\n-}", "output": "FASTER 1.7687", "pair_id": "java_6814_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.4074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class B {\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ private static long N;\n+ private static long LAST;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n+\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n- return st.nextToken();\n- }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n }\n- return str;\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n+ private static long number(long i, long j) {\n+\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 0.8108", "pair_id": "java_5812_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7542} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n+ }\n+ }\n+\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n+\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "FASTER 1.3197", "pair_id": "java_4766_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.4962} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class a1140 {\n- public static void main(String args[]) {\n+public class helloWorld {\n+ public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n- }\n- System.out.println(p);\n+ int n = in.nextInt();\n+ int ans = 0;\n+\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n+\n+ System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "SLOWER 0.0247", "pair_id": "java_200_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0173} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int num = Integer.parseInt(sc.next());\n- String str = sc.next();\n+ int N = Integer.parseInt(sc.next());\n+ String S = sc.next();\n+ StringBuilder sb = new StringBuilder(S);\n+ int ans = 0;\n+ for (int i = 0; i < S.length(); i++) {\n+ String S_tmp = sb.substring(i);\n+ int[] z = z_algo(S_tmp);\n \n- int res = 0;\n- for (int len = num; len > 0; len--) {\n- int[] dp = new int[num];\n- for (int i = num - len - 1; i >= 0; i--) {\n- if (str.charAt(i) == str.charAt(i + len)) {\n- dp[i] = Math.min(dp[i + 1] + 1, len);\n- res = Math.max(res, dp[i]);\n- } else {\n- dp[i] = 0;\n+ for (int j = 1; j < S.length() - i; j++) {\n+ if (j >= z[j]) {\n+ ans = Math.max(ans, z[j]);\n }\n }\n }\n+ System.out.println(ans);\n+ }\n \n- System.out.println(res);\n+ public static int[] z_algo(String S) {\n+ int N = S.length();\n+ int[] A = new int[N];\n+ A[0] = N;\n+ int i = 1;\n+ int j = 0;\n+ while (i < N) {\n+ while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n+ j++;\n+ }\n+ A[i] = j;\n+ if (j == 0) {\n+ i++;\n+ continue;\n+ }\n+ int k = 1;\n+ while (i + k < N && k + A[k] < j) {\n+ A[i + k] = A[k];\n+ k++;\n+ }\n+ i += k;\n+ j -= k;\n+ }\n+ return A;\n }\n }", "output": "SLOWER 0.3859", "pair_id": "java_3833_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.3067} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class ArrayA_300A {\n+public class Demo {\n \n public static void main(String[] args) {\n \n+ int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int arr[] = new int[n];\n- for (int i = 0; i < n; i++) {\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n+ int[] arr = new int[n];\n+\n+ for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n- }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println();\n- } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n }\n }\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n+ }\n+\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n+ }\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n+ }\n+ }\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n+ }\n+\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println(\"\");\n }\n }", "output": "FASTER 0.0587", "pair_id": "java_6832_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0415} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n return;\n }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n return;\n }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 5.3212", "pair_id": "java_4698_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 39.9807} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int num = Integer.parseInt(sc.next());\n- String str = sc.next();\n-\n- int res = 0;\n- for (int len = num; len > 0; len--) {\n- int[] dp = new int[num];\n- for (int i = num - len - 1; i >= 0; i--) {\n- if (str.charAt(i) == str.charAt(i + len)) {\n- dp[i] = Math.min(dp[i + 1] + 1, len);\n- res = Math.max(res, dp[i]);\n+ int n = sc.nextInt();\n+ String s = sc.next();\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ for (int j = i + max + 1; j < n; j++) {\n+ if (0 < s.indexOf(s.substring(i, j), j)) {\n+ max = j - i;\n } else {\n- dp[i] = 0;\n+ break;\n }\n }\n }\n-\n- System.out.println(res);\n+ System.out.println(max);\n+ sc.close();\n }\n }", "output": "FASTER 0.1451", "pair_id": "java_3824_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.1058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n- x -= a;\n- while (b <= x) {\n- x -= b;\n- }\n- System.out.println(x);\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+ System.out.println((X - A) % B);\n }\n }", "output": "SLOWER 0.0682", "pair_id": "java_6638_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0484} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n \n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "SLOWER 0.5231", "pair_id": "java_5784_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.437} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class Main {\n+\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n }\n- System.out.println(p);\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.0714", "pair_id": "java_177_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 33.6238} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n-\n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n-\n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n }\n }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- public static class SegmentTree {\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n \n- static final long INF = Long.MAX_VALUE / 2;\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n \n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n+class IntDualSegmentTree {\n \n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n+ final int[] Dat;\n \n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n+ final int[] Laz;\n \n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n+ final int N;\n \n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n+ final int L;\n \n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n+ final int E1;\n \n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n+ final IntBinaryOperator G;\n \n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n \n- public static void main(String[] args) {\n- new Solver();\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ }\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n+ }\n+ }\n+ propagate(k);\n+ return Dat[k - N];\n }\n \n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n+ }\n \n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n+ Laz[k] = E1;\n }\n }\n+\n+ public static void main(String[] args) {\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ }\n }", "output": "SLOWER 0.736", "pair_id": "java_5735_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.6655} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class worldTour {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n Queue q = new LinkedList();\n ArrayList> neigh = new ArrayList>();\n boolean[][] con = new boolean[n][n];\n int m = sc.nextInt();\n\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n con[u][v] = true;\n }\n\n int[][] dis = new int[n][n];\n for (int i = 0; i < n; i++) {\n neigh.add(new ArrayList());\n for (int j = 0; j < n; j++) {\n if (con[i][j]) neigh.get(i).add(j);\n if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n }\n\n for (int i = 0; i < n; i++) {\n boolean[] vis = new boolean[n];\n q.add(i);\n vis[i] = true;\n while (q.peek() != null) {\n int v = q.poll();\n for (int k = 0; k < neigh.get(v).size(); k++) {\n int j = neigh.get(v).get(k);\n if (!vis[j]) {\n q.add(j);\n vis[j] = true;\n dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n }\n }\n }\n }\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n }\n }\n int[][] prefout = new int[n][3];\n int[][] prefin = new int[n][3];\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][2] = index;\n }\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][2] = index;\n }\n\n int maxDis = -1;\n int[] path = new int[4];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (i == j) continue;\n if (dis[i][j] < 0) continue;\n int IF = 0;\n int JF = 0;\n int IS = 1;\n int JS = 1;\n if (prefin[i][0] == j) IF = 1;\n if (prefout[j][0] == i) JF = 1;\n if (prefin[i][IF + 1] == j) IS = 2;\n if (prefout[j][JF + 1] == i) JS = 2;\n int u = prefin[i][IF];\n int v = prefout[j][JF];\n if (u < 0 || v < 0) continue;\n if (u != v) {\n int D = dis[u][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n } else {\n int uu = prefin[i][IS];\n int vv = prefin[j][JS];\n int D;\n if (uu >= 0 && uu != v) {\n D = dis[uu][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = uu;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n }\n if (vv >= 0 && vv != u) {\n D = dis[u][i] + dis[i][j] + dis[j][vv];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = vv;\n }\n }\n }\n }\n }\n System.out.println(\n (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.lang.reflect.Constructor;\nimport java.util.ArrayDeque;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collection;\nimport java.util.InputMismatchException;\nimport java.util.Iterator;\nimport java.util.LinkedList;\nimport java.util.StringTokenizer;\n\npublic class CodeB {\n private static final boolean SHOULD_BUFFER_OUTPUT = false;\n\n static final SuperWriter sw = new SuperWriter(System.out);\n\n static final SuperScanner sc = new SuperScanner();\n\n static Node[] nodes;\n\n static class Answer implements Comparable {\n final int[] nodes;\n final int cost;\n\n Answer(int a, int b, int cost) {\n this.nodes = new int[] {a, b};\n this.cost = cost;\n }\n\n public Answer(Answer other, int id, int addedCost) {\n this.nodes = new int[other.nodes.length + 1];\n this.nodes[0] = id;\n for (int i = 0; i < other.nodes.length; i++) {\n this.nodes[i + 1] = other.nodes[i];\n }\n this.cost = other.cost + addedCost;\n }\n\n boolean contains(int id) {\n for (int i : nodes) {\n if (i == id) {\n return true;\n }\n }\n return false;\n }\n\n @Override\n public int compareTo(Answer o) {\n return o.cost - cost;\n }\n }\n\n static Answer[] tmpSort;\n\n static Answer[] getN(ArrayList values, int n) {\n Answer[] answer = new Answer[n];\n int currentMinIndex = 0;\n int currentSize = 0;\n for (Answer v : values) {\n if (currentSize != n) {\n answer[currentSize++] = v;\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n } else {\n if (v.cost > answer[currentMinIndex].cost) {\n answer[currentMinIndex] = v;\n }\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n }\n }\n Arrays.sort(answer);\n return answer;\n }\n\n static class Node {\n final ArrayList edges = new ArrayList<>();\n final int id;\n int visitedCost;\n int[] costs;\n Answer[] first;\n Answer[] second;\n\n Node(int id) {\n this.id = id;\n }\n\n Answer[] getFirst() {\n if (first != null) {\n return first;\n }\n ArrayList firstTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n firstTmp.add(new Answer(id, i, cost));\n }\n first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n return first;\n }\n\n Answer[] getSecond() {\n if (second != null) {\n return second;\n }\n LinkedList missing = new LinkedList<>();\n for (int i = 0; i < nodes.length; i++) {\n if (i != id) {\n missing.add(i);\n }\n }\n ArrayList secondTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n for (Answer answer : nodes[i].getFirst()) {\n if (!answer.contains(id)) {\n secondTmp.add(new Answer(answer, id, cost));\n }\n }\n }\n Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n ArrayList relevants = new ArrayList<>();\n for (Answer answer : secondTmp2) {\n if (missing.isEmpty()) {\n break;\n }\n boolean relevant = false;\n Iterator it = missing.iterator();\n while (it.hasNext()) {\n int next = it.next();\n if (!answer.contains(next)) {\n it.remove();\n relevant = true;\n }\n }\n if (relevant) {\n relevants.add(answer);\n }\n }\n return second = relevants.toArray(new Answer[0]);\n }\n\n Answer getSolution(int first, int cost) {\n for (Answer answer : getSecond()) {\n if (!answer.contains(first)) {\n return new Answer(answer, first, cost);\n }\n }\n return null;\n }\n\n Answer getSolution() {\n Answer best = null;\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n Answer possible = nodes[i].getSolution(id, cost);\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n return best;\n }\n }\n\n static int[] getCosts(Node[] nodes, int fromNode) {\n for (Node node : nodes) {\n node.visitedCost = Integer.MAX_VALUE;\n }\n int[] answer = new int[nodes.length];\n Arrays.fill(answer, Integer.MAX_VALUE);\n answer[fromNode] = 0;\n nodes[fromNode].visitedCost = 0;\n ArrayDeque queue = new ArrayDeque<>();\n queue.add(nodes[fromNode]);\n while (!queue.isEmpty()) {\n Node current = queue.pollFirst();\n for (Node edge : current.edges) {\n if (edge.visitedCost != Integer.MAX_VALUE) {\n continue;\n }\n answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n queue.add(edge);\n }\n }\n return answer;\n }\n\n public static void main() {\n int n = sc.nextInt();\n int m = sc.nextInt();\n nodes = new Node[n];\n tmpSort = new Answer[4 * (m + 1)];\n for (int i = 0; i < n; i++) {\n nodes[i] = new Node(i);\n }\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n nodes[u].edges.add(nodes[v]);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n Answer best = null;\n for (int i = 0; i < n; i++) {\n Answer possible = nodes[i].getSolution();\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n for (int i = 0; i < 4; i++) {\n best.nodes[i]++;\n }\n sw.printLine(best.nodes);\n }\n\n static class LineScanner extends Scanner {\n private StringTokenizer st;\n\n public LineScanner(String input) {\n st = new StringTokenizer(input);\n }\n\n @Override\n public String next() {\n return st.hasMoreTokens() ? st.nextToken() : null;\n }\n\n @Override\n public String nextLine() {\n throw new RuntimeException(\"not supported\");\n }\n\n public boolean hasNext() {\n return st.hasMoreTokens();\n }\n\n private final ArrayList temp = new ArrayList();\n\n private void fillTemp() {\n while (st.hasMoreTokens()) {\n temp.add(st.nextToken());\n }\n }\n\n public String[] asStringArray() {\n fillTemp();\n String[] answer = new String[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = (String) temp.get(i);\n }\n temp.clear();\n return answer;\n }\n\n public int[] asIntArray() {\n fillTemp();\n int[] answer = new int[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Integer.parseInt((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public long[] asLongArray() {\n fillTemp();\n long[] answer = new long[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Long.parseLong((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public double[] asDoubleArray() {\n fillTemp();\n double[] answer = new double[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Double.parseDouble((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n }\n\n static class SuperScanner extends Scanner {\n private InputStream stream;\n private byte[] buf = new byte[8096];\n private int curChar;\n private int numChars;\n\n public SuperScanner() {\n this.stream = System.in;\n }\n\n public int read() {\n if (numChars == -1) return -1;\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public static boolean isWhitespace(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n public static boolean isLineEnd(int c) {\n return c == '\\n' || c == -1;\n }\n\n private final StringBuilder sb = new StringBuilder();\n\n @Override\n public String next() {\n int c = read();\n while (isWhitespace(c)) {\n if (c == -1) {\n return null;\n }\n c = read();\n }\n sb.setLength(0);\n do {\n sb.append((char) c);\n c = read();\n } while (!isWhitespace(c));\n return sb.toString();\n }\n\n @Override\n public String nextLine() {\n sb.setLength(0);\n int c;\n while (true) {\n c = read();\n if (!isLineEnd(c)) {\n sb.append((char) c);\n } else {\n break;\n }\n }\n if (c == -1 && sb.length() == 0) {\n return null;\n } else {\n if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n return sb.substring(0, sb.length() - 1);\n } else {\n return sb.toString();\n }\n }\n }\n\n public LineScanner nextLineScanner() {\n String line = nextLine();\n if (line == null) {\n return null;\n } else {\n return new LineScanner(line);\n }\n }\n\n public LineScanner nextNonEmptyLineScanner() {\n while (true) {\n String line = nextLine();\n if (line == null) {\n return null;\n } else if (!line.isEmpty()) {\n return new LineScanner(line);\n }\n }\n }\n\n @Override\n public int nextInt() {\n int c = read();\n while (isWhitespace(c)) {\n c = read();\n }\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n\n @Override\n public long nextLong() {\n int c = read();\n while (isWhitespace(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n long res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n }\n\n abstract static class Scanner {\n\n public abstract String next();\n\n public abstract String nextLine();\n\n public int nextIntOrQuit() {\n Integer n = nextInteger();\n if (n == null) {\n sw.close();\n System.exit(0);\n }\n return n.intValue();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public int[] nextIntArray(int n) {\n int[] res = new int[n];\n for (int i = 0; i < res.length; i++) res[i] = nextInt();\n return res;\n }\n\n public long[] nextLongArray(int n) {\n long[] res = new long[n];\n for (int i = 0; i < res.length; i++) res[i] = nextLong();\n return res;\n }\n\n public double[] nextDoubleArray(int n) {\n double[] res = new double[n];\n for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n return res;\n }\n\n public void sortIntArray(int[] array) {\n Integer[] vals = new Integer[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortLongArray(long[] array) {\n Long[] vals = new Long[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortDoubleArray(double[] array) {\n Double[] vals = new Double[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public String[] nextStringArray(int n) {\n String[] vals = new String[n];\n for (int i = 0; i < n; i++) vals[i] = next();\n return vals;\n }\n\n public Integer nextInteger() {\n String s = next();\n if (s == null) return null;\n return Integer.parseInt(s);\n }\n\n public int[][] nextIntMatrix(int n, int m) {\n int[][] ans = new int[n][];\n for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n return ans;\n }\n\n public char[][] nextGrid(int r) {\n char[][] grid = new char[r][];\n for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n return grid;\n }\n\n public static T fill(T arreglo, int val) {\n if (arreglo instanceof Object[]) {\n Object[] a = (Object[]) arreglo;\n for (Object x : a) fill(x, val);\n } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n return arreglo;\n }\n\n public T[] nextObjectArray(Class clazz, int size) {\n @SuppressWarnings(\"unchecked\")\n T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n for (int c = 0; c < 3; c++) {\n Constructor constructor;\n try {\n if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n else constructor = clazz.getDeclaredConstructor();\n } catch (Exception e) {\n continue;\n }\n try {\n for (int i = 0; i < result.length; i++) {\n if (c == 0) result[i] = constructor.newInstance(this, i);\n else if (c == 1) result[i] = constructor.newInstance(this);\n else result[i] = constructor.newInstance();\n }\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n return result;\n }\n throw new RuntimeException(\"Constructor not found\");\n }\n\n public Collection wrap(int[] as) {\n ArrayList ans = new ArrayList();\n for (int i : as) ans.add(i);\n return ans;\n }\n\n public int[] unwrap(Collection collection) {\n int[] vals = new int[collection.size()];\n int index = 0;\n for (int i : collection) vals[index++] = i;\n return vals;\n }\n\n int testCases = Integer.MIN_VALUE;\n\n boolean testCases() {\n if (testCases == Integer.MIN_VALUE) {\n testCases = nextInt();\n }\n return --testCases >= 0;\n }\n }\n\n static class SuperWriter {\n\n private final PrintWriter writer;\n\n public SuperWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public SuperWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void close() {\n writer.flush();\n writer.close();\n }\n\n public void printLine(String line) {\n writer.println(line);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(long... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int prec, double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n String precision = \"%.\" + prec + \"f\";\n writer.print(String.format(precision, vals[0]).replace(',', '.'));\n precision = \" \" + precision;\n for (int i = 1; i < vals.length; i++)\n writer.print(String.format(precision, vals[i]).replace(',', '.'));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(Collection vals) {\n if (vals.size() == 0) {\n writer.println();\n } else {\n int i = 0;\n for (E val : vals) {\n if (i++ == 0) {\n writer.print(val.toString());\n } else {\n writer.print(\" \".concat(val.toString()));\n }\n }\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printSimple(String value) {\n writer.print(value);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public boolean ifZeroExit(Number... values) {\n for (Number number : values) {\n if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n return false;\n }\n }\n close();\n System.exit(0);\n return true;\n }\n }\n\n public static void main(String[] args) {\n main();\n sw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-public class worldTour {\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.lang.reflect.Constructor;\n+import java.util.ArrayDeque;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.Collection;\n+import java.util.InputMismatchException;\n+import java.util.Iterator;\n+import java.util.LinkedList;\n+import java.util.StringTokenizer;\n+\n+public class CodeB {\n+ private static final boolean SHOULD_BUFFER_OUTPUT = false;\n+\n+ static final SuperWriter sw = new SuperWriter(System.out);\n+\n+ static final SuperScanner sc = new SuperScanner();\n+\n+ static Node[] nodes;\n+\n+ static class Answer implements Comparable {\n+ final int[] nodes;\n+ final int cost;\n+\n+ Answer(int a, int b, int cost) {\n+ this.nodes = new int[] {a, b};\n+ this.cost = cost;\n+ }\n+\n+ public Answer(Answer other, int id, int addedCost) {\n+ this.nodes = new int[other.nodes.length + 1];\n+ this.nodes[0] = id;\n+ for (int i = 0; i < other.nodes.length; i++) {\n+ this.nodes[i + 1] = other.nodes[i];\n+ }\n+ this.cost = other.cost + addedCost;\n+ }\n+\n+ boolean contains(int id) {\n+ for (int i : nodes) {\n+ if (i == id) {\n+ return true;\n+ }\n+ }\n+ return false;\n+ }\n+\n+ @Override\n+ public int compareTo(Answer o) {\n+ return o.cost - cost;\n+ }\n+ }\n+\n+ static Answer[] tmpSort;\n+\n+ static Answer[] getN(ArrayList values, int n) {\n+ Answer[] answer = new Answer[n];\n+ int currentMinIndex = 0;\n+ int currentSize = 0;\n+ for (Answer v : values) {\n+ if (currentSize != n) {\n+ answer[currentSize++] = v;\n+ int min = Integer.MAX_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ if (answer[i] != null && answer[i].cost < min) {\n+ currentMinIndex = i;\n+ min = answer[i].cost;\n+ }\n+ }\n+ } else {\n+ if (v.cost > answer[currentMinIndex].cost) {\n+ answer[currentMinIndex] = v;\n+ }\n+ int min = Integer.MAX_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ if (answer[i] != null && answer[i].cost < min) {\n+ currentMinIndex = i;\n+ min = answer[i].cost;\n+ }\n+ }\n+ }\n+ }\n+ Arrays.sort(answer);\n+ return answer;\n+ }\n+\n+ static class Node {\n+ final ArrayList edges = new ArrayList<>();\n+ final int id;\n+ int visitedCost;\n+ int[] costs;\n+ Answer[] first;\n+ Answer[] second;\n+\n+ Node(int id) {\n+ this.id = id;\n+ }\n+\n+ Answer[] getFirst() {\n+ if (first != null) {\n+ return first;\n+ }\n+ ArrayList firstTmp = new ArrayList<>();\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ firstTmp.add(new Answer(id, i, cost));\n+ }\n+ first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n+ return first;\n+ }\n+\n+ Answer[] getSecond() {\n+ if (second != null) {\n+ return second;\n+ }\n+ LinkedList missing = new LinkedList<>();\n+ for (int i = 0; i < nodes.length; i++) {\n+ if (i != id) {\n+ missing.add(i);\n+ }\n+ }\n+ ArrayList secondTmp = new ArrayList<>();\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ for (Answer answer : nodes[i].getFirst()) {\n+ if (!answer.contains(id)) {\n+ secondTmp.add(new Answer(answer, id, cost));\n+ }\n+ }\n+ }\n+ Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n+ ArrayList relevants = new ArrayList<>();\n+ for (Answer answer : secondTmp2) {\n+ if (missing.isEmpty()) {\n+ break;\n+ }\n+ boolean relevant = false;\n+ Iterator it = missing.iterator();\n+ while (it.hasNext()) {\n+ int next = it.next();\n+ if (!answer.contains(next)) {\n+ it.remove();\n+ relevant = true;\n+ }\n+ }\n+ if (relevant) {\n+ relevants.add(answer);\n+ }\n+ }\n+ return second = relevants.toArray(new Answer[0]);\n+ }\n+\n+ Answer getSolution(int first, int cost) {\n+ for (Answer answer : getSecond()) {\n+ if (!answer.contains(first)) {\n+ return new Answer(answer, first, cost);\n+ }\n+ }\n+ return null;\n+ }\n+\n+ Answer getSolution() {\n+ Answer best = null;\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ Answer possible = nodes[i].getSolution(id, cost);\n+ if (possible != null) {\n+ if (best == null || possible.cost > best.cost) {\n+ best = possible;\n+ }\n+ }\n+ }\n+ return best;\n+ }\n+ }\n+\n+ static int[] getCosts(Node[] nodes, int fromNode) {\n+ for (Node node : nodes) {\n+ node.visitedCost = Integer.MAX_VALUE;\n+ }\n+ int[] answer = new int[nodes.length];\n+ Arrays.fill(answer, Integer.MAX_VALUE);\n+ answer[fromNode] = 0;\n+ nodes[fromNode].visitedCost = 0;\n+ ArrayDeque queue = new ArrayDeque<>();\n+ queue.add(nodes[fromNode]);\n+ while (!queue.isEmpty()) {\n+ Node current = queue.pollFirst();\n+ for (Node edge : current.edges) {\n+ if (edge.visitedCost != Integer.MAX_VALUE) {\n+ continue;\n+ }\n+ answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n+ queue.add(edge);\n+ }\n+ }\n+ return answer;\n+ }\n+\n+ public static void main() {\n int n = sc.nextInt();\n- Queue q = new LinkedList();\n- ArrayList> neigh = new ArrayList>();\n- boolean[][] con = new boolean[n][n];\n int m = sc.nextInt();\n-\n+ nodes = new Node[n];\n+ tmpSort = new Answer[4 * (m + 1)];\n+ for (int i = 0; i < n; i++) {\n+ nodes[i] = new Node(i);\n+ }\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n- con[u][v] = true;\n- }\n-\n- int[][] dis = new int[n][n];\n+ nodes[u].edges.add(nodes[v]);\n+ }\n for (int i = 0; i < n; i++) {\n- neigh.add(new ArrayList());\n- for (int j = 0; j < n; j++) {\n- if (con[i][j]) neigh.get(i).add(j);\n- if (i != j) dis[i][j] = Integer.MAX_VALUE;\n- }\n- }\n-\n+ nodes[i].costs = getCosts(nodes, i);\n+ }\n for (int i = 0; i < n; i++) {\n- boolean[] vis = new boolean[n];\n- q.add(i);\n- vis[i] = true;\n- while (q.peek() != null) {\n- int v = q.poll();\n- for (int k = 0; k < neigh.get(v).size(); k++) {\n- int j = neigh.get(v).get(k);\n- if (!vis[j]) {\n- q.add(j);\n- vis[j] = true;\n- dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n+ nodes[i].costs = getCosts(nodes, i);\n+ }\n+ Answer best = null;\n+ for (int i = 0; i < n; i++) {\n+ Answer possible = nodes[i].getSolution();\n+ if (possible != null) {\n+ if (best == null || possible.cost > best.cost) {\n+ best = possible;\n+ }\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ best.nodes[i]++;\n+ }\n+ sw.printLine(best.nodes);\n+ }\n+\n+ static class LineScanner extends Scanner {\n+ private StringTokenizer st;\n+\n+ public LineScanner(String input) {\n+ st = new StringTokenizer(input);\n+ }\n+\n+ @Override\n+ public String next() {\n+ return st.hasMoreTokens() ? st.nextToken() : null;\n+ }\n+\n+ @Override\n+ public String nextLine() {\n+ throw new RuntimeException(\"not supported\");\n+ }\n+\n+ public boolean hasNext() {\n+ return st.hasMoreTokens();\n+ }\n+\n+ private final ArrayList temp = new ArrayList();\n+\n+ private void fillTemp() {\n+ while (st.hasMoreTokens()) {\n+ temp.add(st.nextToken());\n+ }\n+ }\n+\n+ public String[] asStringArray() {\n+ fillTemp();\n+ String[] answer = new String[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = (String) temp.get(i);\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public int[] asIntArray() {\n+ fillTemp();\n+ int[] answer = new int[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Integer.parseInt((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public long[] asLongArray() {\n+ fillTemp();\n+ long[] answer = new long[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Long.parseLong((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public double[] asDoubleArray() {\n+ fillTemp();\n+ double[] answer = new double[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Double.parseDouble((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+ }\n+\n+ static class SuperScanner extends Scanner {\n+ private InputStream stream;\n+ private byte[] buf = new byte[8096];\n+ private int curChar;\n+ private int numChars;\n+\n+ public SuperScanner() {\n+ this.stream = System.in;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) return -1;\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n+ }\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public static boolean isWhitespace(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+\n+ public static boolean isLineEnd(int c) {\n+ return c == '\\n' || c == -1;\n+ }\n+\n+ private final StringBuilder sb = new StringBuilder();\n+\n+ @Override\n+ public String next() {\n+ int c = read();\n+ while (isWhitespace(c)) {\n+ if (c == -1) {\n+ return null;\n+ }\n+ c = read();\n+ }\n+ sb.setLength(0);\n+ do {\n+ sb.append((char) c);\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return sb.toString();\n+ }\n+\n+ @Override\n+ public String nextLine() {\n+ sb.setLength(0);\n+ int c;\n+ while (true) {\n+ c = read();\n+ if (!isLineEnd(c)) {\n+ sb.append((char) c);\n+ } else {\n+ break;\n+ }\n+ }\n+ if (c == -1 && sb.length() == 0) {\n+ return null;\n+ } else {\n+ if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n+ return sb.substring(0, sb.length() - 1);\n+ } else {\n+ return sb.toString();\n+ }\n+ }\n+ }\n+\n+ public LineScanner nextLineScanner() {\n+ String line = nextLine();\n+ if (line == null) {\n+ return null;\n+ } else {\n+ return new LineScanner(line);\n+ }\n+ }\n+\n+ public LineScanner nextNonEmptyLineScanner() {\n+ while (true) {\n+ String line = nextLine();\n+ if (line == null) {\n+ return null;\n+ } else if (!line.isEmpty()) {\n+ return new LineScanner(line);\n+ }\n+ }\n+ }\n+\n+ @Override\n+ public int nextInt() {\n+ int c = read();\n+ while (isWhitespace(c)) {\n+ c = read();\n+ }\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res = (res << 3) + (res << 1);\n+ res += c - '0';\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return res * sgn;\n+ }\n+\n+ @Override\n+ public long nextLong() {\n+ int c = read();\n+ while (isWhitespace(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ long res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res = (res << 3) + (res << 1);\n+ res += c - '0';\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return res * sgn;\n+ }\n+ }\n+\n+ abstract static class Scanner {\n+\n+ public abstract String next();\n+\n+ public abstract String nextLine();\n+\n+ public int nextIntOrQuit() {\n+ Integer n = nextInteger();\n+ if (n == null) {\n+ sw.close();\n+ System.exit(0);\n+ }\n+ return n.intValue();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public int[] nextIntArray(int n) {\n+ int[] res = new int[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextInt();\n+ return res;\n+ }\n+\n+ public long[] nextLongArray(int n) {\n+ long[] res = new long[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextLong();\n+ return res;\n+ }\n+\n+ public double[] nextDoubleArray(int n) {\n+ double[] res = new double[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n+ return res;\n+ }\n+\n+ public void sortIntArray(int[] array) {\n+ Integer[] vals = new Integer[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public void sortLongArray(long[] array) {\n+ Long[] vals = new Long[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public void sortDoubleArray(double[] array) {\n+ Double[] vals = new Double[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public String[] nextStringArray(int n) {\n+ String[] vals = new String[n];\n+ for (int i = 0; i < n; i++) vals[i] = next();\n+ return vals;\n+ }\n+\n+ public Integer nextInteger() {\n+ String s = next();\n+ if (s == null) return null;\n+ return Integer.parseInt(s);\n+ }\n+\n+ public int[][] nextIntMatrix(int n, int m) {\n+ int[][] ans = new int[n][];\n+ for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n+ return ans;\n+ }\n+\n+ public char[][] nextGrid(int r) {\n+ char[][] grid = new char[r][];\n+ for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n+ return grid;\n+ }\n+\n+ public static T fill(T arreglo, int val) {\n+ if (arreglo instanceof Object[]) {\n+ Object[] a = (Object[]) arreglo;\n+ for (Object x : a) fill(x, val);\n+ } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n+ else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n+ else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n+ return arreglo;\n+ }\n+\n+ public T[] nextObjectArray(Class clazz, int size) {\n+ @SuppressWarnings(\"unchecked\")\n+ T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n+ for (int c = 0; c < 3; c++) {\n+ Constructor constructor;\n+ try {\n+ if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n+ else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n+ else constructor = clazz.getDeclaredConstructor();\n+ } catch (Exception e) {\n+ continue;\n+ }\n+ try {\n+ for (int i = 0; i < result.length; i++) {\n+ if (c == 0) result[i] = constructor.newInstance(this, i);\n+ else if (c == 1) result[i] = constructor.newInstance(this);\n+ else result[i] = constructor.newInstance();\n }\n- }\n- }\n- }\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < n; j++) {\n- if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n- }\n- }\n- int[][] prefout = new int[n][3];\n- int[][] prefin = new int[n][3];\n-\n- for (int i = 0; i < n; i++) {\n- int max = -1;\n- int index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max) {\n- max = dis[i][j];\n- index = j;\n- }\n- }\n- prefout[i][0] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n- max = dis[i][j];\n- index = j;\n- }\n- }\n- prefout[i][1] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n- max = dis[i][j];\n- index = j;\n- }\n- }\n- prefout[i][2] = index;\n- }\n-\n- for (int i = 0; i < n; i++) {\n- int max = -1;\n- int index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][0] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][1] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][2] = index;\n- }\n-\n- int maxDis = -1;\n- int[] path = new int[4];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < n; j++) {\n- if (i == j) continue;\n- if (dis[i][j] < 0) continue;\n- int IF = 0;\n- int JF = 0;\n- int IS = 1;\n- int JS = 1;\n- if (prefin[i][0] == j) IF = 1;\n- if (prefout[j][0] == i) JF = 1;\n- if (prefin[i][IF + 1] == j) IS = 2;\n- if (prefout[j][JF + 1] == i) JS = 2;\n- int u = prefin[i][IF];\n- int v = prefout[j][JF];\n- if (u < 0 || v < 0) continue;\n- if (u != v) {\n- int D = dis[u][i] + dis[i][j] + dis[j][v];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = u;\n- path[1] = i;\n- path[2] = j;\n- path[3] = v;\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n+ return result;\n+ }\n+ throw new RuntimeException(\"Constructor not found\");\n+ }\n+\n+ public Collection wrap(int[] as) {\n+ ArrayList ans = new ArrayList();\n+ for (int i : as) ans.add(i);\n+ return ans;\n+ }\n+\n+ public int[] unwrap(Collection collection) {\n+ int[] vals = new int[collection.size()];\n+ int index = 0;\n+ for (int i : collection) vals[index++] = i;\n+ return vals;\n+ }\n+\n+ int testCases = Integer.MIN_VALUE;\n+\n+ boolean testCases() {\n+ if (testCases == Integer.MIN_VALUE) {\n+ testCases = nextInt();\n+ }\n+ return --testCases >= 0;\n+ }\n+ }\n+\n+ static class SuperWriter {\n+\n+ private final PrintWriter writer;\n+\n+ public SuperWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public SuperWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void close() {\n+ writer.flush();\n+ writer.close();\n+ }\n+\n+ public void printLine(String line) {\n+ writer.println(line);\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(int... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(long... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(double... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(int prec, double... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ String precision = \"%.\" + prec + \"f\";\n+ writer.print(String.format(precision, vals[0]).replace(',', '.'));\n+ precision = \" \" + precision;\n+ for (int i = 1; i < vals.length; i++)\n+ writer.print(String.format(precision, vals[i]).replace(',', '.'));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(Collection vals) {\n+ if (vals.size() == 0) {\n+ writer.println();\n+ } else {\n+ int i = 0;\n+ for (E val : vals) {\n+ if (i++ == 0) {\n+ writer.print(val.toString());\n+ } else {\n+ writer.print(\" \".concat(val.toString()));\n }\n- } else {\n- int uu = prefin[i][IS];\n- int vv = prefin[j][JS];\n- int D;\n- if (uu >= 0 && uu != v) {\n- D = dis[uu][i] + dis[i][j] + dis[j][v];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = uu;\n- path[1] = i;\n- path[2] = j;\n- path[3] = v;\n- }\n- }\n- if (vv >= 0 && vv != u) {\n- D = dis[u][i] + dis[i][j] + dis[j][vv];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = u;\n- path[1] = i;\n- path[2] = j;\n- path[3] = vv;\n- }\n- }\n- }\n- }\n- }\n- System.out.println(\n- (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n+ }\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printSimple(String value) {\n+ writer.print(value);\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public boolean ifZeroExit(Number... values) {\n+ for (Number number : values) {\n+ if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n+ return false;\n+ }\n+ }\n+ close();\n+ System.exit(0);\n+ return true;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ main();\n+ sw.close();\n }\n }", "output": "FASTER 2.7201", "pair_id": "java_6748_forward", "problem_id": "666_B", "language": "java", "direction": "forward", "speedup_ratio": 6.5891} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public class Main {\n \n- private static Scanner sc;\n- private static Printer pr;\n-\n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n-\n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n-\n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n-\n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n-\n- pr.println(ruq.find(index));\n- pr.flush();\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n }\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n-\n- static final int NULL = -1;\n-\n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n- }\n-\n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n+ public static void main(String[] args) {\n+ new Solver();\n+ }\n+\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n- }\n-\n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n } else {\n- return data[index];\n- }\n- }\n- }\n-\n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n-\n- solve();\n-\n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n }\n }\n }", "output": "SLOWER 0.2029", "pair_id": "java_5729_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.151} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- static long mod = 1000000007;\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n }\n }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n+\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- return r;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 1.6833", "pair_id": "java_4705_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.2116} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Codechef {\n- public static void main(String[] args) throws java.lang.Exception {\n+public class TaskC {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int noOfMoves = sc.nextInt();\n- int index = sc.nextInt();\n-\n- int position = index;\n-\n- for (int i = noOfMoves % 6; i >= 1; i--) {\n+ int n = sc.nextInt();\n+ int[] arr = {0, 0, 0};\n+ int x = sc.nextInt();\n+ arr[x] = 1;\n+ int i = 0;\n+ for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n- if (position == 2) position = 1;\n- else if (position == 1) position = 2;\n+ int t = arr[1];\n+ arr[1] = arr[2];\n+ arr[2] = t;\n } else {\n- if (position == 1) position = 0;\n- else if (position == 0) position = 1;\n+ int t = arr[0];\n+ arr[0] = arr[1];\n+ arr[1] = t;\n+ }\n+ }\n+ if (i == 0) {\n+ for (int j = 0; j < 3; j++) {\n+ if (arr[j] == 1) {\n+ System.out.println(j);\n+ break;\n+ }\n+ }\n+ } else {\n+ if (i % 2 == 0) {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(2);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(0);\n+ }\n+ } else {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(0);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(2);\n+ }\n }\n }\n \n- System.out.println(position);\n+ sc.close();\n }\n }", "output": "SLOWER 0.0083", "pair_id": "java_420_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n \n-public class Array {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n- int[] arr = new int[n];\n- int plus = 0;\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int zeros = 0;\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n- }\n- }\n+\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n+ }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n+\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n- }\n- }\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n- print(neg);\n- print(pos);\n- print(z);\n- }\n+ System.out.println();\n \n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n- return;\n }\n }", "output": "SLOWER 0.0358", "pair_id": "java_6824_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0251} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class MyClass {\n+public class triangulation {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n- System.out.println(ans);\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "FASTER 0.0013", "pair_id": "java_214_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0009} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n+ return true;\n+ }\n \n- pw.println(\"NO\");\n- pw.close();\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n+\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n+\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 5.3212", "pair_id": "java_4698_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 39.9807} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class C {\n- static class Point {\n- int x, y;\n-\n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public int getX() {\n- return x;\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n return;\n }\n }\n }\n-\n- System.out.println(\"NO\");\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n+ return true;\n }\n \n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n }\n \n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n }\n \n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 4.326", "pair_id": "java_4696_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 20.0571} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class EducationalRound49B {\n-\n+public class Main {\n public static void main(String[] args) {\n-\n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n- }\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n out.close();\n }\n \n- public static PrintWriter out;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n+ }\n+ }\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n+ } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n \n- int nextInt() {\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n+ public long nextLong() {\n return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n }", "output": "FASTER 0.0106", "pair_id": "java_5762_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n- public static void main(String[] z) {\n- Scanner s = new Scanner(System.in);\n- for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n- m = s.nextInt();\n- Map a = new HashMap();\n- for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n- for (r = 0; m-- > 0; ) {\n- String x = s.next();\n- for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n+public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ if (n == 0 && m == 0) break;\n+\n+ HashMap map = new HashMap();\n+ for (int i = 0; i < n; i++) {\n+ String s = sc.next().replace(\"*\", \".\");\n+ int price = sc.nextInt();\n+ map.put(s, price);\n }\n+\n+ int ans = 0;\n+ for (int i = 0; i < m; i++) {\n+ String x = sc.next();\n+ for (String s : map.keySet()) {\n+ if (x.matches(s)) {\n+ ans += map.get(s);\n+ break;\n+ }\n+ }\n+ }\n+\n+ System.out.println(ans);\n }\n }\n }", "output": "FASTER 0.2218", "pair_id": "java_1006_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 1.1662} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- private static Scanner sc;\n- private static Printer pr;\n+ int n = in.nextInt(), q = in.nextInt();\n \n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n \n- int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n-\n+ int cmd = in.nextInt();\n if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n-\n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n-\n- pr.println(ruq.find(index));\n- pr.flush();\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n+ }\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n }\n+}\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n \n- static final int NULL = -1;\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n+ }\n \n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n \n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n }\n \n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n+ if (heap[ih] >= 0) {\n \n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n }\n \n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n } else {\n- return data[index];\n+ return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n-\n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n-\n- solve();\n-\n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n- }\n- }\n }", "output": "SLOWER 1.3003", "pair_id": "java_5731_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.4628} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.util.*;\n \n-public class newProgram5 {\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- public static void main(String[] args) throws IOException {\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n+ public int getX() {\n+ return x;\n+ }\n \n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n+ public int getY() {\n+ return y;\n+ }\n \n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n+ static class Square {\n+ List points = new ArrayList<>();\n }\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+\n+ System.out.println(\"NO\");\n }\n \n- static class FastIO {\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n \n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n-}\n \n-class Point {\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n \n- double x, y;\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "SLOWER 3.481", "pair_id": "java_4726_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 11.1659} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "FASTER 1.005", "pair_id": "java_4755_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.0069} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class Main {\n+public class JavaApplication42 {\n \n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(sum);\n }\n }", "output": "SLOWER 5.0734", "pair_id": "java_178_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 33.6702} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- String s = sc.next();\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- for (int j = i + max + 1; j < n; j++) {\n- if (0 < s.indexOf(s.substring(i, j), j)) {\n- max = j - i;\n- } else {\n- break;\n+ int N = Integer.parseInt(sc.next());\n+ String S = sc.next();\n+ StringBuilder sb = new StringBuilder(S);\n+ int ans = 0;\n+ for (int i = 0; i < S.length(); i++) {\n+ String S_tmp = sb.substring(i);\n+ int[] z = z_algo(S_tmp);\n+\n+ for (int j = 1; j < S.length() - i; j++) {\n+ if (j >= z[j]) {\n+ ans = Math.max(ans, z[j]);\n }\n }\n }\n- System.out.println(max);\n- sc.close();\n+ System.out.println(ans);\n+ }\n+\n+ public static int[] z_algo(String S) {\n+ int N = S.length();\n+ int[] A = new int[N];\n+ A[0] = N;\n+ int i = 1;\n+ int j = 0;\n+ while (i < N) {\n+ while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n+ j++;\n+ }\n+ A[i] = j;\n+ if (j == 0) {\n+ i++;\n+ continue;\n+ }\n+ int k = 1;\n+ while (i + k < N && k + A[k] < j) {\n+ A[i + k] = A[k];\n+ k++;\n+ }\n+ i += k;\n+ j -= k;\n+ }\n+ return A;\n }\n }", "output": "SLOWER 0.5311", "pair_id": "java_3826_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.445} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n \n public class Main {\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n \n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+\n+ init(n1);\n+ arr = new int[op_num];\n+\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n+ } else {\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n- }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n- }\n-\n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n-\n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n- }\n-}\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n- }\n+ i1++;\n+ mark++;\n }\n }\n \n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ private static int find(int n1, int n2) {\n+\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n }\n \n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n \n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n+ public static void init(int N) {\n+\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- }\n }", "output": "SLOWER 0.4669", "pair_id": "java_5742_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.3821} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Test {\n+public class Main {\n+ static void move(int[] shells, int i) {\n+ int a, b;\n \n- public static void main(String[] args) throws Exception {\n- int[] nums0 = {1, 2, 2, 1, 0, 0};\n- int[] nums1 = {0, 0, 1, 2, 2, 1};\n+ if (i % 2 == 0) {\n+ a = 1;\n+ b = 2;\n+ } else {\n+ a = 0;\n+ b = 1;\n+ }\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int current = sc.nextInt();\n- int rem = n - (n / 6) * 6;\n- if (rem == 0) {\n- System.out.println(current);\n- } else {\n- if (nums0[rem - 1] == current) {\n- System.out.println(\"0\");\n- } else if (nums1[rem - 1] == current) {\n- System.out.println(\"1\");\n- } else {\n- System.out.println(\"2\");\n+ int tmp = shells[a];\n+ shells[a] = shells[b];\n+ shells[b] = tmp;\n+ }\n+\n+ static String getState(int[] shells, int i) {\n+ String state = Integer.toString(i % 2);\n+\n+ state += Integer.toString(shells[0]);\n+ state += Integer.toString(shells[1]);\n+ state += Integer.toString(shells[2]);\n+\n+ return state;\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner in = new Scanner(System.in);\n+\n+ int n = in.nextInt();\n+ int x = in.nextInt();\n+\n+ int[] shells = new int[3];\n+ shells[x] = 1;\n+\n+ ArrayList states = new ArrayList<>();\n+\n+ for (int i = n; i >= 0; i--) {\n+ String state = getState(shells, i);\n+\n+ int idx = states.indexOf(state);\n+\n+ if (idx != -1) {\n+\n+ break;\n+ }\n+\n+ states.add(state);\n+\n+ if (i > 0) {\n+ move(shells, i);\n }\n }\n+\n+ int cycleLength = states.size();\n+ int r = n % cycleLength;\n+\n+ System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "SLOWER 0.0715", "pair_id": "java_428_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0508} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n+import java.io.InputStreamReader;\n import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n-\n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n-\n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n- }\n- }\n-\n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n- }\n-\n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 1.8716", "pair_id": "java_4725_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.6594} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class Main {\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n-\n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n- }\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.2103", "pair_id": "java_5819_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1569} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class triangulation {\n+public class MyClass {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- out.println(sum);\n- out.close();\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.0013", "pair_id": "java_214_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0009} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- if (n == 0 && m == 0) break;\n-\n- HashMap map = new HashMap();\n+ public static void main(String[] arg) {\n+ Scanner in = new Scanner(System.in);\n+ char[][] numbers = new char[100][];\n+ int[] eqVal = new int[100];\n+ for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n+ int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n- String s = sc.next().replace(\"*\", \".\");\n- int price = sc.nextInt();\n- map.put(s, price);\n+ numbers[i] = in.next().toCharArray();\n+ eqVal[i] = in.nextInt();\n }\n-\n- int ans = 0;\n+ int val = 0;\n for (int i = 0; i < m; i++) {\n- String x = sc.next();\n- for (String s : map.keySet()) {\n- if (x.matches(s)) {\n- ans += map.get(s);\n+ char[] hNum = in.next().toCharArray();\n+ for (int index = 0; index < n; index++) {\n+ boolean isMuch = true;\n+ for (int keta = 0; keta < 8; keta++) {\n+ if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n+ isMuch = false;\n+ break;\n+ }\n+ }\n+ if (isMuch) {\n+ val += eqVal[index];\n break;\n }\n }\n }\n-\n- System.out.println(ans);\n+ System.out.println(val);\n }\n }\n }", "output": "FASTER 1.2598", "pair_id": "java_1002_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.3946} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class Main {\n+public class ProblemD {\n \n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n- }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "SLOWER 5.0627", "pair_id": "java_176_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 33.4215} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class Main {\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n- pw.println(v2);\n }\n-\n- pw.flush();\n }\n }", "output": "FASTER 0.2103", "pair_id": "java_5819_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1569} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.Arrays;\n import java.util.Scanner;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- public static void main(String[] args) {\n+ int n = in.nextInt(), q = in.nextInt();\n \n- Scanner sc = new Scanner(System.in);\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n \n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n-\n- init(n1);\n- arr = new int[op_num];\n-\n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n- } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n }\n- i1++;\n- mark++;\n- }\n- }\n-\n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n- }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n- }\n-\n- public static void update(int a, int b, int k, int l, int r, int mark) {\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n- }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n-\n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n+ }\n }\n }\n }\n+\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n+\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n+ }\n+\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n+\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n+ }\n+ }\n+ }\n+}", "output": "FASTER 0.1054", "pair_id": "java_5745_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.0758} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static long mod = 1000000007;\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n+ }\n+ }\n+\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n- pw.print(ans);\n- pw.flush();\n- }\n-\n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n-\n- return r;\n+ System.out.println(\"NO\");\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 0.4447", "pair_id": "java_4702_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.361} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) throws IOException {\n-\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n-\n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n-\n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n }\n-\n- System.out.println(i - 1);\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "SLOWER 6.7548", "pair_id": "java_7305_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 107.9911} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.util.*;\n \n-public class Main {\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ System.out.println(solve(x, y, n));\n+ }\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n }\n }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.0845", "pair_id": "java_5818_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0603} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] arg) {\n- Scanner in = new Scanner(System.in);\n- char[][] numbers = new char[100][];\n- int[] eqVal = new int[100];\n- for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n- int m = in.nextInt();\n- for (int i = 0; i < n; i++) {\n- numbers[i] = in.next().toCharArray();\n- eqVal[i] = in.nextInt();\n+class Main {\n+ public static void main(String[] z) {\n+ Scanner s = new Scanner(System.in);\n+ for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n+ m = s.nextInt();\n+ Map a = new HashMap();\n+ for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n+ for (r = 0; m-- > 0; ) {\n+ String x = s.next();\n+ for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n- int val = 0;\n- for (int i = 0; i < m; i++) {\n- char[] hNum = in.next().toCharArray();\n- for (int index = 0; index < n; index++) {\n- boolean isMuch = true;\n- for (int keta = 0; keta < 8; keta++) {\n- if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n- isMuch = false;\n- break;\n- }\n- }\n- if (isMuch) {\n- val += eqVal[index];\n- break;\n- }\n- }\n- }\n- System.out.println(val);\n }\n }\n }", "output": "SLOWER 1.4816", "pair_id": "java_1003_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.7926} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.StringTokenizer;\n \n-public class second {\n+public class EducationalRound49B {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n }\n- pw.flush();\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "FASTER 1.1223", "pair_id": "java_5781_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.1769} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n+import java.io.InputStreamReader;\n import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n- }\n-\n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n }\n \n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n }\n \n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 2.7166", "pair_id": "java_4695_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 6.5733} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n-\n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n-\n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n- }\n-\n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n try {\n- st = new StringTokenizer(br.readLine());\n+ bufLen = is.read(buf);\n } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n try {\n- str = br.readLine();\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "SLOWER 2.0187", "pair_id": "java_4716_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 4.0521} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n+\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n- st = new StringTokenizer(in.readLine());\n+\n for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n out.close();\n }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n }", "output": "SLOWER 1.6745", "pair_id": "java_4693_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.192} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- if (n == 0 && m == 0) break;\n-\n- String[] a = new String[n];\n- int[] b = new int[n];\n-\n- for (int i = 0; i < n; i++) {\n- a[i] = sc.next();\n- b[i] = sc.nextInt();\n+class Main {\n+ public static void main(String[] z) {\n+ Scanner s = new Scanner(System.in);\n+ for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n+ m = s.nextInt();\n+ Map a = new HashMap();\n+ for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n+ for (r = 0; m-- > 0; ) {\n+ String x = s.next();\n+ for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n-\n- int sum = 0;\n- int c = 0;\n- String s = \"\";\n-\n- for (int i = 0; i < m; i++) {\n- s = sc.next();\n- for (int j = 0; j < n; j++) {\n- c = 0;\n- while (a[j].codePointAt(c) == 42) c++;\n- if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n- }\n- }\n- System.out.println(sum);\n }\n }\n }", "output": "SLOWER 1.3385", "pair_id": "java_1005_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.5289} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n-\n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n- }\n-\n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "FASTER 0.0098", "pair_id": "java_4762_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.0068} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class CF300A {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n- int zeros = 0;\n- int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n+public class R181D2A {\n \n- for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n- }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n- }\n-\n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n- break;\n- }\n- }\n- }\n-\n- int[] num = new int[n];\n-\n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n- }\n- }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n }\n }\n+\n+class gao {\n+\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n+\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n+ }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ }\n+}", "output": "SLOWER 0.0327", "pair_id": "java_6819_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0229} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.util.HashMap;\n+import java.util.Map;\n+import java.util.Scanner;\n \n-public class R733_D {\n+public class Skulptor2 {\n+\n public static void main(String[] args) {\n- InputReader in = new InputReader(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = in.nextInt();\n- int max = 0;\n- int k = 0;\n- int[] ans = new int[2];\n- int[][] recs = new int[n][3];\n- HashMap map = new HashMap<>();\n+ Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n+ int n = scan.nextInt();\n+\n+ L2Map map = new L2Map();\n+ Parallelepiped[] data = new Parallelepiped[n];\n+\n for (int i = 0; i < n; i++) {\n- recs[i][0] = in.nextInt();\n- recs[i][1] = in.nextInt();\n- recs[i][2] = in.nextInt();\n- Arrays.sort(recs[i]);\n- boolean toAdd1 = false;\n- boolean toAdd2 = false;\n- boolean toAdd3 = false;\n- if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][1]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n+ int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n+ Parallelepiped p = new Parallelepiped(i, a, b, c);\n+ data[i] = p;\n+ map.put(p);\n+ }\n+\n+ int maxDiameter = -1;\n+ int first = -1, second = -1;\n+\n+ for (Parallelepiped p : data) {\n+ if (p.c > maxDiameter) {\n+ maxDiameter = p.c;\n+ first = p.index;\n+ second = -1;\n+ }\n+\n+ Parallelepiped p2 = map.get(p);\n+ if (p2 != null) {\n+ int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n+ if (d > maxDiameter) {\n+ first = p.index;\n+ second = p2.index;\n+ maxDiameter = d;\n }\n- if (recs[i][2] > recs[index][2]) {\n- toAdd1 = true;\n- }\n- } else {\n- toAdd1 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][1], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][0] > recs[index][0]) {\n- toAdd2 = true;\n- }\n- } else {\n- toAdd2 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][1] > recs[index][1]) {\n- toAdd3 = true;\n- }\n- } else {\n- toAdd3 = true;\n- }\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n- if (temp > max) {\n- max = temp;\n- k = 1;\n- ans[0] = i;\n- }\n- if (toAdd1) {\n- map.put(new Pair(recs[i][0], recs[i][1]), i);\n- }\n- if (toAdd2) {\n- map.put(new Pair(recs[i][1], recs[i][2]), i);\n- }\n- if (toAdd3) {\n- map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n- out.println(k);\n- for (int i = 0; i < k; i++) {\n- out.print((ans[i] + 1) + \" \");\n+\n+ if (second == -1) {\n+ System.out.println(1);\n+ System.out.println(first + 1);\n+ } else {\n+ System.out.println(2);\n+ System.out.println((first + 1) + \" \" + (second + 1));\n }\n- out.flush();\n }\n \n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n+ static class Parallelepiped {\n+ final int index;\n+ final int a, b, c;\n \n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n+ Parallelepiped(int index, int a, int b, int c) {\n+\n+ this.index = index;\n+\n+ int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n+ int m4 = Math.max(m1, m2),\n+ m5 = Math.min(Math.min(m1, m2), m3),\n+ m6 = Math.min(Math.min(a, b), c);\n+\n+ this.a = m4;\n+ this.b = m5;\n+ this.c = m6;\n+ }\n+ }\n+\n+ static class L2Map {\n+ private Map> map =\n+ new HashMap>();\n+\n+ void put(Parallelepiped v) {\n+\n+ Map map2 = map.get(v.a);\n+ if (map2 == null) {\n+ map2 = new HashMap();\n+ map.put(v.a, map2);\n+ }\n+\n+ Parallelepiped[] currentVs = map2.get(v.b);\n+ if (currentVs == null) {\n+ currentVs = new Parallelepiped[2];\n+ currentVs[0] = v;\n+ map2.put(v.b, currentVs);\n+ } else {\n+ if (currentVs[0].c < v.c) {\n+ currentVs[1] = currentVs[0];\n+ currentVs[0] = v;\n+ } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n+ }\n }\n \n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n+ Parallelepiped get(Parallelepiped p) {\n+ Map map2 = map.get(p.a);\n+ if (map2 == null) return null;\n+ Parallelepiped[] values = map2.get(p.b);\n+ if (values == null) return null;\n+ if (values[0] == p) return values[1];\n+ else return values[0];\n }\n }\n }\n-\n-class Pair {\n- int x;\n- int y;\n-\n- Pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n- }\n-\n- @Override\n- public int hashCode() {\n- return (x + y + 1) * (x + y) / 2 + y;\n- }\n-}", "output": "FASTER 2.0272", "pair_id": "java_9718_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 4.076} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.util.HashMap;\n-import java.util.Map;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Skulptor2 {\n+public class R733_D {\n+ public static void main(String[] args) {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = in.nextInt();\n+ int max = 0;\n+ int k = 0;\n+ int[] ans = new int[2];\n+ int[][] recs = new int[n][3];\n+ HashMap map = new HashMap<>();\n+ for (int i = 0; i < n; i++) {\n+ recs[i][0] = in.nextInt();\n+ recs[i][1] = in.nextInt();\n+ recs[i][2] = in.nextInt();\n+ Arrays.sort(recs[i]);\n+ boolean toAdd1 = false;\n+ boolean toAdd2 = false;\n+ boolean toAdd3 = false;\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][1]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][2] > recs[index][2]) {\n+ toAdd1 = true;\n+ }\n+ } else {\n+ toAdd1 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][1], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][0] > recs[index][0]) {\n+ toAdd2 = true;\n+ }\n+ } else {\n+ toAdd2 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][1] > recs[index][1]) {\n+ toAdd3 = true;\n+ }\n+ } else {\n+ toAdd3 = true;\n+ }\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 1;\n+ ans[0] = i;\n+ }\n+ if (toAdd1) {\n+ map.put(new Pair(recs[i][0], recs[i][1]), i);\n+ }\n+ if (toAdd2) {\n+ map.put(new Pair(recs[i][1], recs[i][2]), i);\n+ }\n+ if (toAdd3) {\n+ map.put(new Pair(recs[i][0], recs[i][2]), i);\n+ }\n+ }\n+ out.println(k);\n+ for (int i = 0; i < k; i++) {\n+ out.print((ans[i] + 1) + \" \");\n+ }\n+ out.flush();\n+ }\n \n- public static void main(String[] args) {\n- Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n- int n = scan.nextInt();\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n \n- L2Map map = new L2Map();\n- Parallelepiped[] data = new Parallelepiped[n];\n-\n- for (int i = 0; i < n; i++) {\n- int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n- Parallelepiped p = new Parallelepiped(i, a, b, c);\n- data[i] = p;\n- map.put(p);\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n }\n \n- int maxDiameter = -1;\n- int first = -1, second = -1;\n-\n- for (Parallelepiped p : data) {\n- if (p.c > maxDiameter) {\n- maxDiameter = p.c;\n- first = p.index;\n- second = -1;\n- }\n-\n- Parallelepiped p2 = map.get(p);\n- if (p2 != null) {\n- int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n- if (d > maxDiameter) {\n- first = p.index;\n- second = p2.index;\n- maxDiameter = d;\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n }\n }\n+ return tokenizer.nextToken();\n }\n \n- if (second == -1) {\n- System.out.println(1);\n- System.out.println(first + 1);\n- } else {\n- System.out.println(2);\n- System.out.println((first + 1) + \" \" + (second + 1));\n- }\n- }\n-\n- static class Parallelepiped {\n- final int index;\n- final int a, b, c;\n-\n- Parallelepiped(int index, int a, int b, int c) {\n-\n- this.index = index;\n-\n- int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n- int m4 = Math.max(m1, m2),\n- m5 = Math.min(Math.min(m1, m2), m3),\n- m6 = Math.min(Math.min(a, b), c);\n-\n- this.a = m4;\n- this.b = m5;\n- this.c = m6;\n- }\n- }\n-\n- static class L2Map {\n- private Map> map =\n- new HashMap>();\n-\n- void put(Parallelepiped v) {\n-\n- Map map2 = map.get(v.a);\n- if (map2 == null) {\n- map2 = new HashMap();\n- map.put(v.a, map2);\n- }\n-\n- Parallelepiped[] currentVs = map2.get(v.b);\n- if (currentVs == null) {\n- currentVs = new Parallelepiped[2];\n- currentVs[0] = v;\n- map2.put(v.b, currentVs);\n- } else {\n- if (currentVs[0].c < v.c) {\n- currentVs[1] = currentVs[0];\n- currentVs[0] = v;\n- } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n- }\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- Parallelepiped get(Parallelepiped p) {\n- Map map2 = map.get(p.a);\n- if (map2 == null) return null;\n- Parallelepiped[] values = map2.get(p.b);\n- if (values == null) return null;\n- if (values[0] == p) return values[1];\n- else return values[0];\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n }\n+\n+class Pair {\n+ int x;\n+ int y;\n+\n+ Pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return (x + y + 1) * (x + y) / 2 + y;\n+ }\n+}", "output": "SLOWER 2.0272", "pair_id": "java_9718_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 4.076} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class R181D2A {\n+public class Array {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n+ int[] arr = new int[n];\n+ int plus = 0;\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n+ }\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n+ }\n+ }\n+ } else {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n+ }\n+ }\n+ }\n+ print(neg);\n+ print(pos);\n+ print(z);\n+ }\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.println();\n+ return;\n }\n }\n-\n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n- }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- }\n-}", "output": "FASTER 0.0245", "pair_id": "java_6823_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0171} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Ideone {\n+public class EducationalRound49B {\n+\n+ public static void main(String[] args) {\n+\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n }\n \n String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n+ } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return Integer.parseInt(next());\n }\n \n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n long nextLong() {\n return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n }\n \n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n- } catch (IOException e) {\n+ } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n- }\n- }\n }", "output": "FASTER 0.6543", "pair_id": "java_5777_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5739} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class B {\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- static long N;\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n-\n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n- }\n- }\n-\n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n-\n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n+ pw.println(v2);\n }\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.7553", "pair_id": "java_5797_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.688} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n }\n }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n-\n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n }\n return true;\n }\n \n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n return false;\n }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n+ }\n }", "output": "SLOWER 5.2994", "pair_id": "java_4697_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 39.3802} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- long n = nextLong();\n- int q = nextInt();\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n \n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n \n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n+ q--;\n }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n }\n }", "output": "SLOWER 0.1027", "pair_id": "java_5752_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0738} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n+ static long mod = 1000000007;\n+\n public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n+\n+ return r;\n+ }\n+}\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n }\n-\n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n+ return st.nextToken();\n }\n \n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 2.4634", "pair_id": "java_4706_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 5.515} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n-import java.util.TreeMap;\n+import java.io.*;\n+import java.util.*;\n \n-public class ProblemD {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt(), a[] = new int[3];\n- int ans = 0, k[] = new int[2];\n- TreeMap map = new TreeMap<>();\n+public class R733_D {\n+ public static void main(String[] args) {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = in.nextInt();\n+ int max = 0;\n+ int k = 0;\n+ int[] ans = new int[2];\n+ int[][] recs = new int[n][3];\n+ HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n- a[0] = sc.nextInt();\n- a[1] = sc.nextInt();\n- a[2] = sc.nextInt();\n- Arrays.sort(a);\n-\n- if (!map.containsKey(new Pair(a[1], a[2]))) {\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- if (ans < a[0]) {\n- ans = a[0];\n- k[0] = i;\n- k[1] = -1;\n+ recs[i][0] = in.nextInt();\n+ recs[i][1] = in.nextInt();\n+ recs[i][2] = in.nextInt();\n+ Arrays.sort(recs[i]);\n+ boolean toAdd1 = false;\n+ boolean toAdd2 = false;\n+ boolean toAdd3 = false;\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][1]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][2] > recs[index][2]) {\n+ toAdd1 = true;\n }\n } else {\n- Pair x = map.get(new Pair(a[1], a[2]));\n- if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n- ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n- k[0] = x.first;\n- k[1] = i;\n+ toAdd1 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][1], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n }\n- if (x.second < a[0]) {\n- map.remove(x);\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ if (recs[i][0] > recs[index][0]) {\n+ toAdd2 = true;\n+ }\n+ } else {\n+ toAdd2 = true;\n+ }\n+ if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n+ int index = map.get(new Pair(recs[i][0], recs[i][2]));\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 2;\n+ ans[0] = index;\n+ ans[1] = i;\n+ }\n+ if (recs[i][1] > recs[index][1]) {\n+ toAdd3 = true;\n+ }\n+ } else {\n+ toAdd3 = true;\n+ }\n+ int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n+ if (temp > max) {\n+ max = temp;\n+ k = 1;\n+ ans[0] = i;\n+ }\n+ if (toAdd1) {\n+ map.put(new Pair(recs[i][0], recs[i][1]), i);\n+ }\n+ if (toAdd2) {\n+ map.put(new Pair(recs[i][1], recs[i][2]), i);\n+ }\n+ if (toAdd3) {\n+ map.put(new Pair(recs[i][0], recs[i][2]), i);\n+ }\n+ }\n+ out.println(k);\n+ for (int i = 0; i < k; i++) {\n+ out.print((ans[i] + 1) + \" \");\n+ }\n+ out.flush();\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n }\n }\n+ return tokenizer.nextToken();\n }\n \n- if (k[1] == -1) {\n- pw.println(1);\n- pw.println(k[0] + 1);\n- } else {\n- pw.println(2);\n- pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n- }\n- pw.flush();\n- pw.close();\n- }\n-\n- static class Pair implements Comparable {\n- int first, second;\n-\n- public Pair(int f, int s) {\n- first = f;\n- second = s;\n- }\n-\n- @Override\n- public int compareTo(Pair pair) {\n- return first == pair.first ? second - pair.second : first - pair.first;\n- }\n-\n- public String toString() {\n- return (\"First: \" + first + \" second: \" + second);\n- }\n- }\n-\n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() throws IOException {\n+ public long nextLong() {\n return Long.parseLong(next());\n }\n \n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n }\n+\n+class Pair {\n+ int x;\n+ int y;\n+\n+ Pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return (x + y + 1) * (x + y) / 2 + y;\n+ }\n+}", "output": "FASTER 0.0839", "pair_id": "java_9722_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0599} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.util.*;\n \n-public class newProgram5 {\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 4.486", "pair_id": "java_4729_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 22.4085} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Test {\n-\n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n-\n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n- }\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 0.0219", "pair_id": "java_4758_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.0153} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n+\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n+ }\n }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.1251", "pair_id": "java_5809_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0906} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class MyClass {\n- public static void main(String[] args) {\n+public class a1140 {\n+ public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- System.out.println(ans);\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.0276", "pair_id": "java_202_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0193} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n- }\n- }\n- }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public String next() {\n+ String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n- st = new StringTokenizer(br.readLine());\n+ st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n return st.nextToken();\n }\n \n- public int nextInt() {\n+ int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "SLOWER 0.6532", "pair_id": "java_5766_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5727} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class TwoSquares {\n+public class Main {\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n \n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n }\n }\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n+ }\n+ }\n+\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "FASTER 4.7142", "pair_id": "java_4746_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 26.2484} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Demo {\n+public class ArrayA_300A {\n \n public static void main(String[] args) {\n \n- int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n- int[] arr = new int[n];\n-\n- for (int i = 0; i < arr.length; i++) {\n+ int n = sc.nextInt();\n+ int arr[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n-\n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n+ }\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println();\n+ } else {\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n- }\n-\n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n-\n- for (int i = 0; i < arr.length; i++) {\n-\n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n- }\n- }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n- }\n-\n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println(\"\");\n }\n }", "output": "SLOWER 0.0587", "pair_id": "java_6832_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0415} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.awt.Polygon;\n-import java.awt.Rectangle;\n+import java.awt.geom.Area;\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n+\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n out.close();\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n-\n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ return false;\n }\n }", "output": "FASTER 4.3122", "pair_id": "java_4738_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 19.8662} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.Arrays;\n import java.util.Scanner;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n+ int n = in.nextInt(), q = in.nextInt();\n \n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n \n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n-\n- } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n+ }\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n }\n+}\n \n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n+\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n }\n+ return pow2 * 2;\n }\n \n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n \n- if (x > right || y < left) return;\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n \n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "FASTER 0.1702", "pair_id": "java_5746_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.1252} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n public class C {\n- static class Point {\n- int x, y;\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n \n- public int getX() {\n- return x;\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n }\n \n- public int getY() {\n- return y;\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n }\n \n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n+ static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n \n- public FastScanner() {\n+ public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n }\n return str;\n }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 3.6281", "pair_id": "java_4717_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 12.3642} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class R181D2A {\n+public class CF300A {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n+ int n = sc.nextInt();\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ for (int i = 0; i < n; i++) {\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n+ }\n+\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n+ break;\n+ }\n+ }\n+ }\n+\n+ int[] num = new int[n];\n+\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n+ }\n+ }\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n+\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n+ }\n+ pr.flush();\n }\n }\n-\n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n- }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- }\n-}", "output": "FASTER 0.0327", "pair_id": "java_6819_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0229} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Codechef {\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner sc = new Scanner(System.in);\n- int noOfMoves = sc.nextInt();\n- int index = sc.nextInt();\n-\n- int position = index;\n-\n- for (int i = noOfMoves % 6; i >= 1; i--) {\n- if (i % 2 == 0) {\n- if (position == 2) position = 1;\n- else if (position == 1) position = 2;\n- } else {\n- if (position == 1) position = 0;\n- else if (position == 0) position = 1;\n- }\n- }\n-\n- System.out.println(position);\n+public class ShellGame {\n+ public static void main(String[] args) {\n+ Scanner nw = new Scanner(System.in);\n+ int n = nw.nextInt();\n+ int pos = nw.nextInt();\n+ String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n+ (n) %= elm.length;\n+ System.out.println(elm[n].charAt(pos));\n }\n }", "output": "SLOWER 0.1472", "pair_id": "java_422_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.1074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- System.out.println(solve(x, y, n));\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n- }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+ pw.flush();\n }\n }", "output": "SLOWER 0.1258", "pair_id": "java_5822_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0911} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Diff (A ��� B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n-import java.util.TreeMap;\n+import java.io.*;\n+import java.util.*;\n \n-public class ProblemD {\n+public class Main {\n+ static HashMap map;\n+ static HashMap pos;\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt(), a[] = new int[3];\n- int ans = 0, k[] = new int[2];\n- TreeMap map = new TreeMap<>();\n- for (int i = 0; i < n; i++) {\n- a[0] = sc.nextInt();\n- a[1] = sc.nextInt();\n- a[2] = sc.nextInt();\n- Arrays.sort(a);\n-\n- if (!map.containsKey(new Pair(a[1], a[2]))) {\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- if (ans < a[0]) {\n- ans = a[0];\n- k[0] = i;\n- k[1] = -1;\n- }\n- } else {\n- Pair x = map.get(new Pair(a[1], a[2]));\n- if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n- ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n- k[0] = x.first;\n- k[1] = i;\n- }\n- if (x.second < a[0]) {\n- map.remove(x);\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- }\n+ static void update(long value, int temp, int i) {\n+ if (!map.containsKey(value)) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n+ } else {\n+ int val = map.get(value);\n+ if (temp > val) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n }\n- }\n-\n- if (k[1] == -1) {\n- pw.println(1);\n- pw.println(k[0] + 1);\n- } else {\n- pw.println(2);\n- pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n- }\n- pw.flush();\n- pw.close();\n- }\n-\n- static class Pair implements Comparable {\n- int first, second;\n-\n- public Pair(int f, int s) {\n- first = f;\n- second = s;\n- }\n-\n- @Override\n- public int compareTo(Pair pair) {\n- return first == pair.first ? second - pair.second : first - pair.first;\n- }\n-\n- public String toString() {\n- return (\"First: \" + first + \" second: \" + second);\n }\n }\n \n- static class Scanner {\n+ static int det(long temp) {\n+ if (!map.containsKey(temp)) return 0;\n+ return map.get(temp);\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n+ map = new HashMap<>();\n+ pos = new HashMap<>();\n+ long mod = (long) 1E9 + 7;\n+ int ans = 0;\n+ int single = -1;\n+ int next = -1;\n+ int postemp = -1;\n+ for (int i = 1; i <= n; i++) {\n+ st = new StringTokenizer(br.readLine());\n+ int a = Integer.parseInt(st.nextToken());\n+ int b = Integer.parseInt(st.nextToken());\n+ int c = Integer.parseInt(st.nextToken());\n+ int min = Math.min(a, Math.min(b, c));\n+ if (ans < min) {\n+ ans = min;\n+ single = i;\n+ next = -1;\n+ }\n+ int val = det(Math.min(a, b) * mod + Math.max(a, b));\n+ if (val > 0) {\n+ postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n+ val = Math.min(a, Math.min(b, val + c));\n+ if (ans < val) {\n+ ans = val;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n+ if (val1 > 0) {\n+ postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n+ val1 = Math.min(a, Math.min(c, b + val1));\n+ if (ans < val1) {\n+ ans = val1;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n+ if (val2 > 0) {\n+ postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n+ val2 = Math.min(b, Math.min(c, a + val2));\n+ if (ans < val2) {\n+ ans = val2;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n+ update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n+ update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ if (next == -1) {\n+ System.out.println(\"1\");\n+ System.out.println(single);\n+ return;\n }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n+ System.out.println(\"2\");\n+ System.out.println(single + \" \" + next);\n }\n }", "output": "FASTER 0.7316", "pair_id": "java_9721_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 1.6605} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- private static long N;\n- private static long LAST;\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- LAST = N * N / 2 + (N & 1);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ return str;\n }\n }\n \n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n }\n }", "output": "FASTER 0.8108", "pair_id": "java_5812_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7542} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n+ }\n+\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n+\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n-\n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n }\n }", "output": "SLOWER 5.9867", "pair_id": "java_4700_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 63.4136} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- System.out.println(solve(x, y, n));\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n+ m = (long) ((n * n) / 2 + 1);\n }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n } else {\n- if (x % 2 != 0) {\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n+ System.out.println(m + no);\n }\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.1136", "pair_id": "java_5814_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0819} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class A5 {\n+public class ShellGame {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextLong();\n- int x = in.nextInt();\n- int[] a = new int[] {0, 0, 0};\n- a[x] = 1;\n- n %= 6;\n-\n- for (long i = n; i > 0; --i) {\n- if (i % 2 == 1) {\n- int t = a[0];\n- a[0] = a[1];\n- a[1] = t;\n- } else {\n- int t = a[1];\n- a[1] = a[2];\n- a[2] = t;\n- }\n- }\n- System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n+ Scanner nw = new Scanner(System.in);\n+ int n = nw.nextInt();\n+ int pos = nw.nextInt();\n+ String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n+ (n) %= elm.length;\n+ System.out.println(elm[n].charAt(pos));\n }\n }", "output": "SLOWER 0.1835", "pair_id": "java_418_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.1356} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class Main {\n+ static long mod = 1000000007;\n+\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ return r;\n }\n }\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+}", "output": "FASTER 5.068", "pair_id": "java_4709_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 33.5438} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n import java.io.BufferedReader;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n }\n \n- public int getX() {\n- return x;\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n }\n \n- public int getY() {\n- return y;\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n }\n \n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n }\n \n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n }\n \n- @Override\n- public String toString() {\n- return x + \",\" + y;\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n- }\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n \n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n \n- System.out.println(\"NO\");\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n }\n \n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ return false;\n }\n }", "output": "FASTER 2.6516", "pair_id": "java_4734_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 6.2835} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n City[] cities = new City[n];\n for (int i = 0; i < n; ++i) {\n cities[i] = new City(i);\n }\n for (int i = 0; i < m; ++i) {\n City a = cities[in.nextInt() - 1];\n City b = cities[in.nextInt() - 1];\n a.outgo.add(b);\n }\n int[][] dd = new int[n][n];\n City[] q = new City[n];\n for (int i = 0; i < n; ++i) {\n for (City x : cities) {\n x.dist = -1;\n }\n cities[i].dist = 0;\n int qt = 0;\n int qh = 1;\n q[0] = cities[i];\n while (qt < qh) {\n City cur = q[qt++];\n for (City other : cur.outgo) {\n if (other.dist < 0) {\n other.dist = cur.dist + 1;\n q[qh++] = other;\n }\n }\n }\n for (int j = 0; j < n; ++j) {\n dd[i][j] = cities[j].dist;\n }\n }\n\n int[] first = new int[n];\n int[] next = new int[n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[i][j];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestOut[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[j][i];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestIn[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n\n City ra = null;\n City rb = null;\n City rc = null;\n City rd = null;\n int res = 0;\n\n for (City b : cities) {\n b.mark = true;\n for (City c : cities)\n if (!c.mark) {\n int bc = dd[b.index][c.index];\n if (bc < 0) continue;\n c.mark = true;\n for (City a : b.closestIn)\n if (a != null && !a.mark) {\n int ab = dd[a.index][b.index];\n if (ab < 0) continue;\n a.mark = true;\n for (City d : c.closestOut)\n if (d != null && !d.mark) {\n int cd = dd[c.index][d.index];\n if (cd < 0) continue;\n d.mark = true;\n int cur = ab + bc + cd;\n if (cur > res) {\n res = cur;\n ra = a;\n rb = b;\n rc = c;\n rd = d;\n }\n d.mark = false;\n }\n a.mark = false;\n }\n c.mark = false;\n }\n b.mark = false;\n }\n\n out.println(\n (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n\n static class City {\n int index;\n int dist;\n List outgo = new ArrayList<>(1);\n boolean mark = false;\n City[] closestIn = new City[3];\n City[] closestOut = new City[3];\n\n public City(int index) {\n this.index = index;\n }\n }\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class worldTour {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n Queue q = new LinkedList();\n ArrayList> neigh = new ArrayList>();\n boolean[][] con = new boolean[n][n];\n int m = sc.nextInt();\n\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n con[u][v] = true;\n }\n\n int[][] dis = new int[n][n];\n for (int i = 0; i < n; i++) {\n neigh.add(new ArrayList());\n for (int j = 0; j < n; j++) {\n if (con[i][j]) neigh.get(i).add(j);\n if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n }\n\n for (int i = 0; i < n; i++) {\n boolean[] vis = new boolean[n];\n q.add(i);\n vis[i] = true;\n while (q.peek() != null) {\n int v = q.poll();\n for (int k = 0; k < neigh.get(v).size(); k++) {\n int j = neigh.get(v).get(k);\n if (!vis[j]) {\n q.add(j);\n vis[j] = true;\n dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n }\n }\n }\n }\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n }\n }\n int[][] prefout = new int[n][3];\n int[][] prefin = new int[n][3];\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][2] = index;\n }\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][2] = index;\n }\n\n int maxDis = -1;\n int[] path = new int[4];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (i == j) continue;\n if (dis[i][j] < 0) continue;\n int IF = 0;\n int JF = 0;\n int IS = 1;\n int JS = 1;\n if (prefin[i][0] == j) IF = 1;\n if (prefout[j][0] == i) JF = 1;\n if (prefin[i][IF + 1] == j) IS = 2;\n if (prefout[j][JF + 1] == i) JS = 2;\n int u = prefin[i][IF];\n int v = prefout[j][JF];\n if (u < 0 || v < 0) continue;\n if (u != v) {\n int D = dis[u][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n } else {\n int uu = prefin[i][IS];\n int vv = prefin[j][JS];\n int D;\n if (uu >= 0 && uu != v) {\n D = dis[uu][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = uu;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n }\n if (vv >= 0 && vv != u) {\n D = dis[u][i] + dis[i][j] + dis[j][vv];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = vv;\n }\n }\n }\n }\n }\n System.out.println(\n (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.List;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n+public class worldTour {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ Queue q = new LinkedList();\n+ ArrayList> neigh = new ArrayList>();\n+ boolean[][] con = new boolean[n][n];\n+ int m = sc.nextInt();\n \n- static class TaskB {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- City[] cities = new City[n];\n- for (int i = 0; i < n; ++i) {\n- cities[i] = new City(i);\n+ for (int i = 0; i < m; i++) {\n+ int u = sc.nextInt() - 1;\n+ int v = sc.nextInt() - 1;\n+ con[u][v] = true;\n+ }\n+\n+ int[][] dis = new int[n][n];\n+ for (int i = 0; i < n; i++) {\n+ neigh.add(new ArrayList());\n+ for (int j = 0; j < n; j++) {\n+ if (con[i][j]) neigh.get(i).add(j);\n+ if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n- for (int i = 0; i < m; ++i) {\n- City a = cities[in.nextInt() - 1];\n- City b = cities[in.nextInt() - 1];\n- a.outgo.add(b);\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ boolean[] vis = new boolean[n];\n+ q.add(i);\n+ vis[i] = true;\n+ while (q.peek() != null) {\n+ int v = q.poll();\n+ for (int k = 0; k < neigh.get(v).size(); k++) {\n+ int j = neigh.get(v).get(k);\n+ if (!vis[j]) {\n+ q.add(j);\n+ vis[j] = true;\n+ dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n+ }\n+ }\n }\n- int[][] dd = new int[n][n];\n- City[] q = new City[n];\n- for (int i = 0; i < n; ++i) {\n- for (City x : cities) {\n- x.dist = -1;\n+ }\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < n; j++) {\n+ if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n+ }\n+ }\n+ int[][] prefout = new int[n][3];\n+ int[][] prefin = new int[n][3];\n+\n+ for (int i = 0; i < n; i++) {\n+ int max = -1;\n+ int index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max) {\n+ max = dis[i][j];\n+ index = j;\n }\n- cities[i].dist = 0;\n- int qt = 0;\n- int qh = 1;\n- q[0] = cities[i];\n- while (qt < qh) {\n- City cur = q[qt++];\n- for (City other : cur.outgo) {\n- if (other.dist < 0) {\n- other.dist = cur.dist + 1;\n- q[qh++] = other;\n+ }\n+ prefout[i][0] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n+ max = dis[i][j];\n+ index = j;\n+ }\n+ }\n+ prefout[i][1] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n+ max = dis[i][j];\n+ index = j;\n+ }\n+ }\n+ prefout[i][2] = index;\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ int max = -1;\n+ int index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max) {\n+ max = dis[j][i];\n+ index = j;\n+ }\n+ }\n+ prefin[i][0] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n+ max = dis[j][i];\n+ index = j;\n+ }\n+ }\n+ prefin[i][1] = index;\n+ max = -1;\n+ index = -1;\n+ for (int j = 0; j < n; j++) {\n+ if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n+ max = dis[j][i];\n+ index = j;\n+ }\n+ }\n+ prefin[i][2] = index;\n+ }\n+\n+ int maxDis = -1;\n+ int[] path = new int[4];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < n; j++) {\n+ if (i == j) continue;\n+ if (dis[i][j] < 0) continue;\n+ int IF = 0;\n+ int JF = 0;\n+ int IS = 1;\n+ int JS = 1;\n+ if (prefin[i][0] == j) IF = 1;\n+ if (prefout[j][0] == i) JF = 1;\n+ if (prefin[i][IF + 1] == j) IS = 2;\n+ if (prefout[j][JF + 1] == i) JS = 2;\n+ int u = prefin[i][IF];\n+ int v = prefout[j][JF];\n+ if (u < 0 || v < 0) continue;\n+ if (u != v) {\n+ int D = dis[u][i] + dis[i][j] + dis[j][v];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = u;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = v;\n+ }\n+ } else {\n+ int uu = prefin[i][IS];\n+ int vv = prefin[j][JS];\n+ int D;\n+ if (uu >= 0 && uu != v) {\n+ D = dis[uu][i] + dis[i][j] + dis[j][v];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = uu;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = v;\n+ }\n+ }\n+ if (vv >= 0 && vv != u) {\n+ D = dis[u][i] + dis[i][j] + dis[j][vv];\n+ if (D > maxDis) {\n+ maxDis = D;\n+ path[0] = u;\n+ path[1] = i;\n+ path[2] = j;\n+ path[3] = vv;\n }\n }\n }\n- for (int j = 0; j < n; ++j) {\n- dd[i][j] = cities[j].dist;\n- }\n- }\n-\n- int[] first = new int[n];\n- int[] next = new int[n];\n- for (int i = 0; i < n; ++i) {\n- Arrays.fill(first, -1);\n- for (int j = 0; j < n; ++j) {\n- int cd = dd[i][j];\n- if (cd < 0) continue;\n- next[j] = first[cd];\n- first[cd] = j;\n- }\n- int ptr = 0;\n- outer:\n- for (int cd = n - 1; cd >= 1; --cd) {\n- int cur = first[cd];\n- while (cur >= 0) {\n- cities[i].closestOut[ptr] = cities[cur];\n- ++ptr;\n- if (ptr == 3) break outer;\n- cur = next[cur];\n- }\n- }\n- }\n- for (int i = 0; i < n; ++i) {\n- Arrays.fill(first, -1);\n- for (int j = 0; j < n; ++j) {\n- int cd = dd[j][i];\n- if (cd < 0) continue;\n- next[j] = first[cd];\n- first[cd] = j;\n- }\n- int ptr = 0;\n- outer:\n- for (int cd = n - 1; cd >= 1; --cd) {\n- int cur = first[cd];\n- while (cur >= 0) {\n- cities[i].closestIn[ptr] = cities[cur];\n- ++ptr;\n- if (ptr == 3) break outer;\n- cur = next[cur];\n- }\n- }\n- }\n-\n- City ra = null;\n- City rb = null;\n- City rc = null;\n- City rd = null;\n- int res = 0;\n-\n- for (City b : cities) {\n- b.mark = true;\n- for (City c : cities)\n- if (!c.mark) {\n- int bc = dd[b.index][c.index];\n- if (bc < 0) continue;\n- c.mark = true;\n- for (City a : b.closestIn)\n- if (a != null && !a.mark) {\n- int ab = dd[a.index][b.index];\n- if (ab < 0) continue;\n- a.mark = true;\n- for (City d : c.closestOut)\n- if (d != null && !d.mark) {\n- int cd = dd[c.index][d.index];\n- if (cd < 0) continue;\n- d.mark = true;\n- int cur = ab + bc + cd;\n- if (cur > res) {\n- res = cur;\n- ra = a;\n- rb = b;\n- rc = c;\n- rd = d;\n- }\n- d.mark = false;\n- }\n- a.mark = false;\n- }\n- c.mark = false;\n- }\n- b.mark = false;\n- }\n-\n- out.println(\n- (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n- }\n-\n- static class City {\n- int index;\n- int dist;\n- List outgo = new ArrayList<>(1);\n- boolean mark = false;\n- City[] closestIn = new City[3];\n- City[] closestOut = new City[3];\n-\n- public City(int index) {\n- this.index = index;\n }\n }\n- }\n-\n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(\n+ (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n }", "output": "SLOWER 1.3578", "pair_id": "java_6749_reversed", "problem_id": "666_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.563} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n+import java.io.Closeable;\n import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n-\n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "SLOWER 2.7166", "pair_id": "java_4695_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 6.5733} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class JavaApplication42 {\n+\n+ public static void main(String[] args) {\n+\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n- System.out.println(p);\n+ System.out.println(sum);\n }\n }", "output": "SLOWER 0.002", "pair_id": "java_199_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0014} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.util.*;\n \n-public class B {\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- static long N;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n-\n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n- }\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n-\n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n }\n }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.6296", "pair_id": "java_5796_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5471} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n }\n }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.1136", "pair_id": "java_5814_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0819} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = Integer.parseInt(sc.next());\n- String S = sc.next();\n- StringBuilder sb = new StringBuilder(S);\n- int ans = 0;\n- for (int i = 0; i < S.length(); i++) {\n- String S_tmp = sb.substring(i);\n- int[] z = z_algo(S_tmp);\n-\n- for (int j = 1; j < S.length() - i; j++) {\n- if (j >= z[j]) {\n- ans = Math.max(ans, z[j]);\n+ int n = sc.nextInt();\n+ String s = sc.next();\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ for (int j = i + max + 1; j < n; j++) {\n+ if (0 < s.indexOf(s.substring(i, j), j)) {\n+ max = j - i;\n+ } else {\n+ break;\n }\n }\n }\n- System.out.println(ans);\n- }\n-\n- public static int[] z_algo(String S) {\n- int N = S.length();\n- int[] A = new int[N];\n- A[0] = N;\n- int i = 1;\n- int j = 0;\n- while (i < N) {\n- while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n- j++;\n- }\n- A[i] = j;\n- if (j == 0) {\n- i++;\n- continue;\n- }\n- int k = 1;\n- while (i + k < N && k + A[k] < j) {\n- A[i + k] = A[k];\n- k++;\n- }\n- i += k;\n- j -= k;\n- }\n- return A;\n+ System.out.println(max);\n+ sc.close();\n }\n }", "output": "FASTER 0.5311", "pair_id": "java_3826_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.445} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class GFG {\n+public class B {\n+\n+ static long N;\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n \n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n- pw.println(v2);\n+ }\n+ }\n+\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n+\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n }\n \n- pw.flush();\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n+ }\n }\n }", "output": "FASTER 0.7553", "pair_id": "java_5797_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.688} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n+ }\n+ }\n+\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "FASTER 3.3847", "pair_id": "java_4743_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 10.4445} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class A5 {\n- public static void main(String[] args) {\n+public class Main {\n+ static void move(int[] shells, int i) {\n+ int a, b;\n+\n+ if (i % 2 == 0) {\n+ a = 1;\n+ b = 2;\n+ } else {\n+ a = 0;\n+ b = 1;\n+ }\n+\n+ int tmp = shells[a];\n+ shells[a] = shells[b];\n+ shells[b] = tmp;\n+ }\n+\n+ static String getState(int[] shells, int i) {\n+ String state = Integer.toString(i % 2);\n+\n+ state += Integer.toString(shells[0]);\n+ state += Integer.toString(shells[1]);\n+ state += Integer.toString(shells[2]);\n+\n+ return state;\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n- long n = in.nextLong();\n+\n+ int n = in.nextInt();\n int x = in.nextInt();\n- int[] a = new int[] {0, 0, 0};\n- a[x] = 1;\n- n %= 6;\n \n- for (long i = n; i > 0; --i) {\n- if (i % 2 == 1) {\n- int t = a[0];\n- a[0] = a[1];\n- a[1] = t;\n- } else {\n- int t = a[1];\n- a[1] = a[2];\n- a[2] = t;\n+ int[] shells = new int[3];\n+ shells[x] = 1;\n+\n+ ArrayList states = new ArrayList<>();\n+\n+ for (int i = n; i >= 0; i--) {\n+ String state = getState(shells, i);\n+\n+ int idx = states.indexOf(state);\n+\n+ if (idx != -1) {\n+\n+ break;\n+ }\n+\n+ states.add(state);\n+\n+ if (i > 0) {\n+ move(shells, i);\n }\n }\n- System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n+\n+ int cycleLength = states.size();\n+ int r = n % cycleLength;\n+\n+ System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "SLOWER 0.1892", "pair_id": "java_419_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.1401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- static class Stone implements Comparable {\n- int a, b, c, position;\n+ static HashMap map;\n+ static HashMap pos;\n \n- Stone(int a, int b, int c, int d) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- this.position = d;\n- }\n-\n- Stone() {}\n-\n- @Override\n- public int compareTo(Stone s) {\n- if (this.c < s.c) return -1;\n- else if (this.c > s.c) return 1;\n- else if (this.b < s.b) return -1;\n- else if (this.b > s.b) return 1;\n- else if (this.a < s.a) return -1;\n- else if (this.a > s.a) return 1;\n- else return 0;\n+ static void update(long value, int temp, int i) {\n+ if (!map.containsKey(value)) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n+ } else {\n+ int val = map.get(value);\n+ if (temp > val) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n+ }\n }\n }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- while (sc.hasNext()) {\n- int n = sc.nextInt();\n- int max = -1;\n- int index = 0;\n- Stone[] s = new Stone[n];\n- int flag = 0;\n- int jg1 = 0;\n- int jg2 = 0;\n- int shu[] = new int[3];\n- for (int i = 0; i < n; i++) {\n- shu[0] = sc.nextInt();\n- shu[1] = sc.nextInt();\n- shu[2] = sc.nextInt();\n- Arrays.sort(shu);\n- s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n- if (max < shu[0]) {\n- index = i + 1;\n- max = shu[0];\n+ static int det(long temp) {\n+ if (!map.containsKey(temp)) return 0;\n+ return map.get(temp);\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int n = Integer.parseInt(br.readLine());\n+ StringTokenizer st;\n+ map = new HashMap<>();\n+ pos = new HashMap<>();\n+ long mod = (long) 1E9 + 7;\n+ int ans = 0;\n+ int single = -1;\n+ int next = -1;\n+ int postemp = -1;\n+ for (int i = 1; i <= n; i++) {\n+ st = new StringTokenizer(br.readLine());\n+ int a = Integer.parseInt(st.nextToken());\n+ int b = Integer.parseInt(st.nextToken());\n+ int c = Integer.parseInt(st.nextToken());\n+ int min = Math.min(a, Math.min(b, c));\n+ if (ans < min) {\n+ ans = min;\n+ single = i;\n+ next = -1;\n+ }\n+ int val = det(Math.min(a, b) * mod + Math.max(a, b));\n+ if (val > 0) {\n+ postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n+ val = Math.min(a, Math.min(b, val + c));\n+ if (ans < val) {\n+ ans = val;\n+ single = i;\n+ next = postemp;\n }\n }\n- Arrays.sort(s);\n- for (int i = 0; i < n - 1; i++) {\n- if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n- int[] bj = new int[3];\n- bj[0] = s[i].a + s[i + 1].a;\n- bj[1] = s[i].b;\n- bj[2] = s[i].c;\n- Arrays.sort(bj);\n- if (bj[0] > max) {\n- flag = 1;\n- max = bj[0];\n- jg1 = s[i].position;\n- jg2 = s[i + 1].position;\n- }\n+ int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n+ if (val1 > 0) {\n+ postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n+ val1 = Math.min(a, Math.min(c, b + val1));\n+ if (ans < val1) {\n+ ans = val1;\n+ single = i;\n+ next = postemp;\n }\n }\n- if (flag == 1) {\n- System.out.println(2);\n- System.out.println(jg1 + \" \" + jg2);\n- } else {\n- System.out.println(1);\n- System.out.println(index);\n+ int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n+ if (val2 > 0) {\n+ postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n+ val2 = Math.min(b, Math.min(c, a + val2));\n+ if (ans < val2) {\n+ ans = val2;\n+ single = i;\n+ next = postemp;\n+ }\n }\n+ update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n+ update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n+ update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n+ if (next == -1) {\n+ System.out.println(\"1\");\n+ System.out.println(single);\n+ return;\n+ }\n+ System.out.println(\"2\");\n+ System.out.println(single + \" \" + next);\n }\n }", "output": "SLOWER 2.2889", "pair_id": "java_9714_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 4.8867} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class triangulation {\n+public class helloWorld {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n- }\n- out.println(sum);\n- out.close();\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n+\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n+\n+ System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "FASTER 0.0016", "pair_id": "java_210_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0011} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n-\n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n-\n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n-\n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 1.041", "pair_id": "java_5790_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.0577} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n- x -= a;\n- while (b <= x) {\n- x -= b;\n- }\n- System.out.println(x);\n+ System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n }", "output": "SLOWER 0.0521", "pair_id": "java_6636_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0368} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class Main {\n+public class B {\n+\n+ static long N;\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n }\n }\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n }\n \n public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n }\n- return st.nextToken();\n+ return res.toString();\n }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n }\n \n- public long nextLong() {\n- return Long.parseLong(next());\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n }\n }\n }", "output": "SLOWER 0.1489", "pair_id": "java_5764_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1087} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n-\n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n+public class Main {\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ new Solver();\n+ }\n+\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n- }\n- }\n- }\n-\n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n+ }\n }\n }", "output": "FASTER 1.1967", "pair_id": "java_5737_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.2921} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class MyClass {\n+public class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n- }\n+ int n = in.nextInt();\n+ int ans = 0;\n+\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n+\n System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "FASTER 0.0029", "pair_id": "java_211_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.002} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class B {\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ static long N;\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n+\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n+ }\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n+\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n }\n }\n }", "output": "FASTER 0.466", "pair_id": "java_5792_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.3813} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.util.*;\n \n public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n \n- public static void main(String[] args) {\n- int n = in.nextInt();\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n+ }\n+ }\n \n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1004", "pair_id": "java_219_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0721} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n+public class GFG {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n- }\n- }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ pw.println(v2);\n }\n \n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.9043", "pair_id": "java_5770_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.8716} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n \n-public class Array {\n+public class Demo {\n+\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n+\n+ int n, n1, n2, n3;\n+ Scanner sc = new Scanner(System.in);\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n int[] arr = new int[n];\n- int plus = 0;\n- for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n- }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n- }\n- }\n- } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n- }\n+\n+ for (int i = 0; i < arr.length; i++) {\n+ arr[i] = sc.nextInt();\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n }\n }\n- print(neg);\n- print(pos);\n- print(z);\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n+ }\n+\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n+ }\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n+ }\n+ }\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n }\n \n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n- System.out.println();\n- return;\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println(\"\");\n }\n }", "output": "SLOWER 0.0607", "pair_id": "java_6825_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static long mod = 1000000007;\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n+\n for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n- pw.print(ans);\n- pw.flush();\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n-\n- return r;\n+ return false;\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 1.4212", "pair_id": "java_4704_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.6781} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n+ }\n+ }\n+\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ }\n+\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "SLOWER 0.6655", "pair_id": "java_4763_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.5861} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ static class sort implements Comparable {\n+ int a, b, c;\n+\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.6641", "pair_id": "java_5755_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5846} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n+ int n = in.nextInt(), q = in.nextInt();\n \n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n+\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n- }\n- }\n-\n- public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n-\n- } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n- }\n- }\n- }\n-\n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n }\n }\n+\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n+\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n+ }\n+\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n+\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n+ }\n+ }\n+ }\n+}", "output": "SLOWER 1.579", "pair_id": "java_5725_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.9877} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Test {\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n+\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n \n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n- }\n- }\n-\n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n- }\n-\n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 1.3513", "pair_id": "java_4761_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.5515} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.PrintWriter;\n import java.util.*;\n \n-public class GFG {\n+public class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ long n = sc.nextLong();\n int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n-\n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n-\n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n-\n pw.flush();\n }\n }", "output": "SLOWER 0.2286", "pair_id": "java_5825_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1717} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class second {\n+public class B {\n+\n+ static long N;\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n+\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n+ }\n }\n- pw.flush();\n+ }\n+\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n+\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n+ }\n }\n }", "output": "FASTER 0.984", "pair_id": "java_5798_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.9779} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Main {\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n- }\n-\n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n- }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "SLOWER 3.3628", "pair_id": "java_4742_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 10.2876} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- private static long N;\n- private static long LAST;\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n-\n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n- }\n }", "output": "FASTER 0.8492", "pair_id": "java_5806_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.8015} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n- }\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 4.633", "pair_id": "java_4720_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 24.8134} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "FASTER 0.6655", "pair_id": "java_4763_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.5861} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n- public static void main(String[] z) {\n- Scanner s = new Scanner(System.in);\n- for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n- m = s.nextInt();\n- Map a = new HashMap();\n- for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n- for (r = 0; m-- > 0; ) {\n- String x = s.next();\n- for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n+public class Main {\n+ public static void main(String[] arg) {\n+ Scanner in = new Scanner(System.in);\n+ char[][] numbers = new char[100][];\n+ int[] eqVal = new int[100];\n+ for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n+ int m = in.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ numbers[i] = in.next().toCharArray();\n+ eqVal[i] = in.nextInt();\n }\n+ int val = 0;\n+ for (int i = 0; i < m; i++) {\n+ char[] hNum = in.next().toCharArray();\n+ for (int index = 0; index < n; index++) {\n+ boolean isMuch = true;\n+ for (int keta = 0; keta < 8; keta++) {\n+ if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n+ isMuch = false;\n+ break;\n+ }\n+ }\n+ if (isMuch) {\n+ val += eqVal[index];\n+ break;\n+ }\n+ }\n+ }\n+ System.out.println(val);\n }\n }\n }", "output": "FASTER 1.4816", "pair_id": "java_1003_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.7926} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n \n for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n+ }\n+\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ }\n+ return false;\n }\n }", "output": "FASTER 4.9762", "pair_id": "java_4739_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 31.4773} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- static class sort implements Comparable {\n- int a, b, c;\n-\n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n }\n }", "output": "SLOWER 0.6641", "pair_id": "java_5755_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5846} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = Integer.parseInt(sc.next());\n- String S = sc.next();\n- StringBuilder sb = new StringBuilder(S);\n- int ans = 0;\n- for (int i = 0; i < S.length(); i++) {\n- String S_tmp = sb.substring(i);\n- int[] z = z_algo(S_tmp);\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ String s = in.next();\n \n- for (int j = 1; j < S.length() - i; j++) {\n- if (j >= z[j]) {\n- ans = Math.max(ans, z[j]);\n- }\n+ HashSet set = new HashSet<>();\n+\n+ int len = 1;\n+ int lenMax = 0;\n+ for (int st = 0; st + len - 1 < n; st++) {\n+ String temp = s.substring(st, st + len);\n+\n+ while (s.indexOf(temp, st + len) > st) {\n+ len++;\n+ temp = s.substring(st, st + len);\n }\n+ lenMax = Math.max(lenMax, len - 1);\n }\n- System.out.println(ans);\n- }\n \n- public static int[] z_algo(String S) {\n- int N = S.length();\n- int[] A = new int[N];\n- A[0] = N;\n- int i = 1;\n- int j = 0;\n- while (i < N) {\n- while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n- j++;\n- }\n- A[i] = j;\n- if (j == 0) {\n- i++;\n- continue;\n- }\n- int k = 1;\n- while (i + k < N && k + A[k] < j) {\n- A[i + k] = A[k];\n- k++;\n- }\n- i += k;\n- j -= k;\n- }\n- return A;\n+ System.out.println(lenMax);\n+ in.close();\n }\n }", "output": "FASTER 0.4881", "pair_id": "java_3830_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.4026} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class Main {\n- static long mod = 1000000007;\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n+ }\n+\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n+\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n }\n }\n- pw.print(ans);\n- pw.flush();\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n }\n- p >>= 1;\n- a = (a * a) % mod;\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n }\n \n- return r;\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 4.0728", "pair_id": "java_4707_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 16.8279} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n-\n+public class triangulation {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n+ }\n+ out.println(sum);\n out.close();\n }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n- }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n- }\n }", "output": "SLOWER 5.0976", "pair_id": "java_180_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 34.2401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class newProgram5 {\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- public static void main(String[] args) throws IOException {\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n \n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n \n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n }\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n-\n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ return false;\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 0.8294", "pair_id": "java_4723_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.777} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class B {\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ private static long N;\n+ private static long LAST;\n \n- System.out.println(solve(x, y, n));\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n+\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n+ private static long number(long i, long j) {\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 0.6856", "pair_id": "java_5824_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.6084} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- public static void main(String[] args) {\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n+ }\n+ }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- Scanner sc = new Scanner(System.in);\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n \n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n \n- init(n1);\n- arr = new int[op_num];\n+class IntDualSegmentTree {\n \n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n- } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n+ final int[] Dat;\n+\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n }\n- i1++;\n- mark++;\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n+ }\n }\n }\n \n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n+ }\n+ }\n+ propagate(k);\n+ return Dat[k - N];\n }\n \n- public static void update(int a, int b, int k, int l, int r, int mark) {\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n }\n \n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n+ } else {\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n+ }\n+ Laz[k] = E1;\n }\n }\n+\n+ public static void main(String[] args) {\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ }\n }", "output": "FASTER 0.4669", "pair_id": "java_5742_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.3821} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Test {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n+ }\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n }\n }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n+ return false;\n+ }\n+ }\n+\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n }\n }\n- }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n- }\n }", "output": "SLOWER 0.6873", "pair_id": "java_4760_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.6103} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n-\n public static void main(String[] args) {\n- int n = in.nextInt();\n-\n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.1158", "pair_id": "java_190_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0836} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class JavaApplication42 {\n-\n+public class triangulation {\n public static void main(String[] args) {\n-\n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n- System.out.println(sum);\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "SLOWER 0.0242", "pair_id": "java_206_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0169} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n-import java.util.TreeMap;\n+import java.io.BufferedInputStream;\n+import java.util.HashMap;\n+import java.util.Map;\n+import java.util.Scanner;\n \n-public class ProblemD {\n+public class Skulptor2 {\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt(), a[] = new int[3];\n- int ans = 0, k[] = new int[2];\n- TreeMap map = new TreeMap<>();\n+ public static void main(String[] args) {\n+ Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n+ int n = scan.nextInt();\n+\n+ L2Map map = new L2Map();\n+ Parallelepiped[] data = new Parallelepiped[n];\n+\n for (int i = 0; i < n; i++) {\n- a[0] = sc.nextInt();\n- a[1] = sc.nextInt();\n- a[2] = sc.nextInt();\n- Arrays.sort(a);\n+ int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n+ Parallelepiped p = new Parallelepiped(i, a, b, c);\n+ data[i] = p;\n+ map.put(p);\n+ }\n \n- if (!map.containsKey(new Pair(a[1], a[2]))) {\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- if (ans < a[0]) {\n- ans = a[0];\n- k[0] = i;\n- k[1] = -1;\n- }\n- } else {\n- Pair x = map.get(new Pair(a[1], a[2]));\n- if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n- ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n- k[0] = x.first;\n- k[1] = i;\n- }\n- if (x.second < a[0]) {\n- map.remove(x);\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ int maxDiameter = -1;\n+ int first = -1, second = -1;\n+\n+ for (Parallelepiped p : data) {\n+ if (p.c > maxDiameter) {\n+ maxDiameter = p.c;\n+ first = p.index;\n+ second = -1;\n+ }\n+\n+ Parallelepiped p2 = map.get(p);\n+ if (p2 != null) {\n+ int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n+ if (d > maxDiameter) {\n+ first = p.index;\n+ second = p2.index;\n+ maxDiameter = d;\n }\n }\n }\n \n- if (k[1] == -1) {\n- pw.println(1);\n- pw.println(k[0] + 1);\n+ if (second == -1) {\n+ System.out.println(1);\n+ System.out.println(first + 1);\n } else {\n- pw.println(2);\n- pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n- }\n- pw.flush();\n- pw.close();\n- }\n-\n- static class Pair implements Comparable {\n- int first, second;\n-\n- public Pair(int f, int s) {\n- first = f;\n- second = s;\n- }\n-\n- @Override\n- public int compareTo(Pair pair) {\n- return first == pair.first ? second - pair.second : first - pair.first;\n- }\n-\n- public String toString() {\n- return (\"First: \" + first + \" second: \" + second);\n+ System.out.println(2);\n+ System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n+ static class Parallelepiped {\n+ final int index;\n+ final int a, b, c;\n \n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n+ Parallelepiped(int index, int a, int b, int c) {\n+\n+ this.index = index;\n+\n+ int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n+ int m4 = Math.max(m1, m2),\n+ m5 = Math.min(Math.min(m1, m2), m3),\n+ m6 = Math.min(Math.min(a, b), c);\n+\n+ this.a = m4;\n+ this.b = m5;\n+ this.c = m6;\n+ }\n+ }\n+\n+ static class L2Map {\n+ private Map> map =\n+ new HashMap>();\n+\n+ void put(Parallelepiped v) {\n+\n+ Map map2 = map.get(v.a);\n+ if (map2 == null) {\n+ map2 = new HashMap();\n+ map.put(v.a, map2);\n+ }\n+\n+ Parallelepiped[] currentVs = map2.get(v.b);\n+ if (currentVs == null) {\n+ currentVs = new Parallelepiped[2];\n+ currentVs[0] = v;\n+ map2.put(v.b, currentVs);\n+ } else {\n+ if (currentVs[0].c < v.c) {\n+ currentVs[1] = currentVs[0];\n+ currentVs[0] = v;\n+ } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n+ }\n }\n \n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ Parallelepiped get(Parallelepiped p) {\n+ Map map2 = map.get(p.a);\n+ if (map2 == null) return null;\n+ Parallelepiped[] values = map2.get(p.b);\n+ if (values == null) return null;\n+ if (values[0] == p) return values[1];\n+ else return values[0];\n }\n }\n }", "output": "FASTER 2.111", "pair_id": "java_9719_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 4.32} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n+ }\n+\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ }\n+ return false;\n }\n }", "output": "FASTER 3.6565", "pair_id": "java_4737_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 12.6101} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int x = sc.nextInt();\n int b = sc.nextInt();\n int y = sc.nextInt();\n int t1 = 0, t2 = 0;\n int count = 0, count1, count2;\n for (int i = 0; i < n * 20; i++) {\n count1 = 0;\n count2 = 0;\n if (a == b && t1 == t2) {\n count = 1;\n System.out.println(\"YES\");\n break;\n }\n if (a == x || b == y) break;\n if (a < n) a++;\n else a = 1;\n if (b > 1) b--;\n else b = n;\n t1++;\n t2++;\n }\n if (count == 0) System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n boolean nextBoolean() {\n return Boolean.parseBoolean(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws IOException {\n FastReader fr = new FastReader();\n int n = fr.nextInt();\n int a = fr.nextInt() - 1;\n int x = fr.nextInt() - 1;\n int b = fr.nextInt() - 1;\n int y = fr.nextInt() - 1;\n\n int i = a;\n int j = b;\n while (true) {\n\n if (i == j) {\n System.out.println(\"YES\");\n return;\n } else if (i == x || j == y) {\n System.out.println(\"NO\");\n return;\n } else {\n i = (i + 1) % (n);\n j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int x = sc.nextInt();\n- int b = sc.nextInt();\n- int y = sc.nextInt();\n- int t1 = 0, t2 = 0;\n- int count = 0, count1, count2;\n- for (int i = 0; i < n * 20; i++) {\n- count1 = 0;\n- count2 = 0;\n- if (a == b && t1 == t2) {\n- count = 1;\n+\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ boolean nextBoolean() {\n+ return Boolean.parseBoolean(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ FastReader fr = new FastReader();\n+ int n = fr.nextInt();\n+ int a = fr.nextInt() - 1;\n+ int x = fr.nextInt() - 1;\n+ int b = fr.nextInt() - 1;\n+ int y = fr.nextInt() - 1;\n+\n+ int i = a;\n+ int j = b;\n+ while (true) {\n+\n+ if (i == j) {\n System.out.println(\"YES\");\n- break;\n+ return;\n+ } else if (i == x || j == y) {\n+ System.out.println(\"NO\");\n+ return;\n+ } else {\n+ i = (i + 1) % (n);\n+ j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n- if (a == x || b == y) break;\n- if (a < n) a++;\n- else a = 1;\n- if (b > 1) b--;\n- else b = n;\n- t1++;\n- t2++;\n }\n- if (count == 0) System.out.println(\"NO\");\n }\n }", "output": "FASTER 5.8277", "pair_id": "java_5828_forward", "problem_id": "1169_A", "language": "java", "direction": "forward", "speedup_ratio": 56.7971} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String[] argc) {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n-\n- System.out.println((x - a) % b);\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+ System.out.println((X - A) % B);\n }\n }", "output": "SLOWER 0.0111", "pair_id": "java_6641_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Test {\n+public class TaskC {\n \n- public static void main(String[] args) throws Exception {\n- int[] nums0 = {1, 2, 2, 1, 0, 0};\n- int[] nums1 = {0, 0, 1, 2, 2, 1};\n-\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n- int current = sc.nextInt();\n- int rem = n - (n / 6) * 6;\n- if (rem == 0) {\n- System.out.println(current);\n- } else {\n- if (nums0[rem - 1] == current) {\n- System.out.println(\"0\");\n- } else if (nums1[rem - 1] == current) {\n- System.out.println(\"1\");\n+ int[] arr = {0, 0, 0};\n+ int x = sc.nextInt();\n+ arr[x] = 1;\n+ int i = 0;\n+ for (i = n; i > 0 && arr[1] != 1; i--) {\n+ if (i % 2 == 0) {\n+ int t = arr[1];\n+ arr[1] = arr[2];\n+ arr[2] = t;\n } else {\n- System.out.println(\"2\");\n+ int t = arr[0];\n+ arr[0] = arr[1];\n+ arr[1] = t;\n }\n }\n+ if (i == 0) {\n+ for (int j = 0; j < 3; j++) {\n+ if (arr[j] == 1) {\n+ System.out.println(j);\n+ break;\n+ }\n+ }\n+ } else {\n+ if (i % 2 == 0) {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(2);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(0);\n+ }\n+ } else {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(0);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(2);\n+ }\n+ }\n+ }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.073", "pair_id": "java_424_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0519} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n import java.util.StringTokenizer;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n+\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n+ }\n+ }\n+\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n- st = new StringTokenizer(in.readLine());\n+\n for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n-\n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ System.out.println(\"NO\");\n }\n }", "output": "SLOWER 0.698", "pair_id": "java_4691_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.6222} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- static class sort implements Comparable {\n- int a, b, c;\n-\n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ public static void main(String[] args) throws java.lang.Exception {\n \n- long n = nextLong();\n- int q = nextInt();\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n \n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n+ System.out.println(m + no);\n }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n }\n }", "output": "SLOWER 0.6758", "pair_id": "java_5756_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5975} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class MyClass {\n+public class JavaApplication42 {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n- System.out.println(ans);\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.0256", "pair_id": "java_207_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0179} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n+public class second {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n- }\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n- }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 1.1329", "pair_id": "java_5771_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.193} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Codechef {\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner sc = new Scanner(System.in);\n- int noOfMoves = sc.nextInt();\n- int index = sc.nextInt();\n+public class A5 {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextLong();\n+ int x = in.nextInt();\n+ int[] a = new int[] {0, 0, 0};\n+ a[x] = 1;\n+ n %= 6;\n \n- int position = index;\n-\n- for (int i = noOfMoves % 6; i >= 1; i--) {\n- if (i % 2 == 0) {\n- if (position == 2) position = 1;\n- else if (position == 1) position = 2;\n+ for (long i = n; i > 0; --i) {\n+ if (i % 2 == 1) {\n+ int t = a[0];\n+ a[0] = a[1];\n+ a[1] = t;\n } else {\n- if (position == 1) position = 0;\n- else if (position == 0) position = 1;\n+ int t = a[1];\n+ a[1] = a[2];\n+ a[2] = t;\n }\n }\n-\n- System.out.println(position);\n+ System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "FASTER 0.0363", "pair_id": "java_415_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n+public class triangulation {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n- System.out.println(sum);\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "SLOWER 0.1092", "pair_id": "java_188_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0786} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n+import java.io.Closeable;\n+import java.io.IOException;\n import java.io.InputStream;\n-import java.io.InputStreamReader;\n import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n- }\n-\n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n }\n }\n }", "output": "FASTER 3.2701", "pair_id": "java_4751_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 9.6472} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Main {\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n-\n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n-\n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n- }\n- }\n-\n- public static class SegmentTree {\n-\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n-\n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n- }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n+ } else {\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n \n- public static void main(String[] args) {\n- new Solver();\n- }\n-\n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "SLOWER 1.1967", "pair_id": "java_5737_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.2921} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class JavaApplication42 {\n-\n+public class MyClass {\n public static void main(String[] args) {\n-\n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- System.out.println(sum);\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.0256", "pair_id": "java_207_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0179} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n+\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n+\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n }\n- pw.flush();\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ }\n+\n+ q--;\n+ }\n }\n }", "output": "FASTER 1.041", "pair_id": "java_5790_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.0577} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.4679", "pair_id": "java_5816_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.3831} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n+\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n }\n- return st.nextToken();\n+\n+ if (neg) return -ret;\n+ return ret;\n }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n }\n \n- long nextLong() {\n- return Long.parseLong(next());\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n \n- System.out.println(m + no);\n- }\n+ q--;\n }\n }\n }", "output": "FASTER 0.5731", "pair_id": "java_5786_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.4877} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n-import java.util.TreeMap;\n+import java.io.*;\n+import java.util.*;\n \n-public class ProblemD {\n+public class Main {\n+ static class Stone implements Comparable {\n+ int a, b, c, position;\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt(), a[] = new int[3];\n- int ans = 0, k[] = new int[2];\n- TreeMap map = new TreeMap<>();\n- for (int i = 0; i < n; i++) {\n- a[0] = sc.nextInt();\n- a[1] = sc.nextInt();\n- a[2] = sc.nextInt();\n- Arrays.sort(a);\n-\n- if (!map.containsKey(new Pair(a[1], a[2]))) {\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- if (ans < a[0]) {\n- ans = a[0];\n- k[0] = i;\n- k[1] = -1;\n- }\n- } else {\n- Pair x = map.get(new Pair(a[1], a[2]));\n- if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n- ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n- k[0] = x.first;\n- k[1] = i;\n- }\n- if (x.second < a[0]) {\n- map.remove(x);\n- map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n- }\n- }\n+ Stone(int a, int b, int c, int d) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ this.position = d;\n }\n \n- if (k[1] == -1) {\n- pw.println(1);\n- pw.println(k[0] + 1);\n- } else {\n- pw.println(2);\n- pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n- }\n- pw.flush();\n- pw.close();\n- }\n-\n- static class Pair implements Comparable {\n- int first, second;\n-\n- public Pair(int f, int s) {\n- first = f;\n- second = s;\n- }\n+ Stone() {}\n \n @Override\n- public int compareTo(Pair pair) {\n- return first == pair.first ? second - pair.second : first - pair.first;\n- }\n-\n- public String toString() {\n- return (\"First: \" + first + \" second: \" + second);\n+ public int compareTo(Stone s) {\n+ if (this.c < s.c) return -1;\n+ else if (this.c > s.c) return 1;\n+ else if (this.b < s.b) return -1;\n+ else if (this.b > s.b) return 1;\n+ else if (this.a < s.a) return -1;\n+ else if (this.a > s.a) return 1;\n+ else return 0;\n }\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ while (sc.hasNext()) {\n+ int n = sc.nextInt();\n+ int max = -1;\n+ int index = 0;\n+ Stone[] s = new Stone[n];\n+ int flag = 0;\n+ int jg1 = 0;\n+ int jg2 = 0;\n+ int shu[] = new int[3];\n+ for (int i = 0; i < n; i++) {\n+ shu[0] = sc.nextInt();\n+ shu[1] = sc.nextInt();\n+ shu[2] = sc.nextInt();\n+ Arrays.sort(shu);\n+ s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n+ if (max < shu[0]) {\n+ index = i + 1;\n+ max = shu[0];\n+ }\n }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n+ Arrays.sort(s);\n+ for (int i = 0; i < n - 1; i++) {\n+ if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n+ int[] bj = new int[3];\n+ bj[0] = s[i].a + s[i + 1].a;\n+ bj[1] = s[i].b;\n+ bj[2] = s[i].c;\n+ Arrays.sort(bj);\n+ if (bj[0] > max) {\n+ flag = 1;\n+ max = bj[0];\n+ jg1 = s[i].position;\n+ jg2 = s[i + 1].position;\n+ }\n }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ }\n+ if (flag == 1) {\n+ System.out.println(2);\n+ System.out.println(jg1 + \" \" + jg2);\n+ } else {\n+ System.out.println(1);\n+ System.out.println(index);\n+ }\n }\n }\n }", "output": "FASTER 3.0204", "pair_id": "java_9716_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 8.1142} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] arg) {\n- Scanner in = new Scanner(System.in);\n- char[][] numbers = new char[100][];\n- int[] eqVal = new int[100];\n- for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n- int m = in.nextInt();\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ if (n == 0 && m == 0) break;\n+\n+ HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n- numbers[i] = in.next().toCharArray();\n- eqVal[i] = in.nextInt();\n+ String s = sc.next().replace(\"*\", \".\");\n+ int price = sc.nextInt();\n+ map.put(s, price);\n }\n- int val = 0;\n+\n+ int ans = 0;\n for (int i = 0; i < m; i++) {\n- char[] hNum = in.next().toCharArray();\n- for (int index = 0; index < n; index++) {\n- boolean isMuch = true;\n- for (int keta = 0; keta < 8; keta++) {\n- if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n- isMuch = false;\n- break;\n- }\n- }\n- if (isMuch) {\n- val += eqVal[index];\n+ String x = sc.next();\n+ for (String s : map.keySet()) {\n+ if (x.matches(s)) {\n+ ans += map.get(s);\n break;\n }\n }\n }\n- System.out.println(val);\n+\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 1.2598", "pair_id": "java_1002_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.3946} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.*;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n+ }\n+\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n+\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n }\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "FASTER 2.3247", "pair_id": "java_4757_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 5.0095} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static class sort implements Comparable {\n- int a, b, c;\n-\n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- long n = nextLong();\n- int q = nextInt();\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n \n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n+ return st.nextToken();\n }\n \n- pw.close();\n- }\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "SLOWER 0.0109", "pair_id": "java_5750_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0076} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n-\n+public class MyClass {\n public static void main(String[] args) {\n- int n = in.nextInt();\n-\n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.0053", "pair_id": "java_217_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0037} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class Main {\n+public class B {\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ static long N;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- long diff = ((N * N) + 1) / 2;\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n \n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n \n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+ System.out.println(nBef + cc + colSt);\n+ }\n+ }\n+ }\n \n- gone = gone + j / 2;\n- } else {\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- gone = gone + ((i - 1) / 2 * N);\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n \n- gone = gone + (j + 1) / 2;\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n \n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n \n- gone = gone + (j + 1) / 2;\n- } else {\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n \n- gone = gone + ((i - 1) / 2) * N;\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n \n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n }\n }\n }", "output": "FASTER 0.545", "pair_id": "java_5795_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.459} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n+\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n+\n+ System.out.println(solve(x, y, n));\n }\n- pw.flush();\n+ }\n+\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n+\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n+ }\n+ }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.3545", "pair_id": "java_5823_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.2785} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n public class Main {\n- static class node {\n- int x;\n- int y;\n+ static long mod = 1000000007;\n+\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n }\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n+ }\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n- }\n+ return r;\n+ }\n+}\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n- }\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 5.0777", "pair_id": "java_4710_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 33.7714} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n+ int n = in.nextInt(), q = in.nextInt();\n \n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n \n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n }\n- }\n-\n- public static class SegmentTree {\n-\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n-\n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n- }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n- }\n- }\n- }\n-\n- public static void main(String[] args) {\n- new Solver();\n- }\n-\n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n }\n }\n+\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n+\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n+ }\n+\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n+\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n+ }\n+ }\n+ }\n+}", "output": "SLOWER 1.0975", "pair_id": "java_5736_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.1398} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.util.HashMap;\n-import java.util.Map;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Skulptor2 {\n+public class Main {\n+ static class Stone implements Comparable {\n+ int a, b, c, position;\n \n- public static void main(String[] args) {\n- Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n- int n = scan.nextInt();\n-\n- L2Map map = new L2Map();\n- Parallelepiped[] data = new Parallelepiped[n];\n-\n- for (int i = 0; i < n; i++) {\n- int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n- Parallelepiped p = new Parallelepiped(i, a, b, c);\n- data[i] = p;\n- map.put(p);\n+ Stone(int a, int b, int c, int d) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ this.position = d;\n }\n \n- int maxDiameter = -1;\n- int first = -1, second = -1;\n+ Stone() {}\n \n- for (Parallelepiped p : data) {\n- if (p.c > maxDiameter) {\n- maxDiameter = p.c;\n- first = p.index;\n- second = -1;\n- }\n-\n- Parallelepiped p2 = map.get(p);\n- if (p2 != null) {\n- int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n- if (d > maxDiameter) {\n- first = p.index;\n- second = p2.index;\n- maxDiameter = d;\n- }\n- }\n- }\n-\n- if (second == -1) {\n- System.out.println(1);\n- System.out.println(first + 1);\n- } else {\n- System.out.println(2);\n- System.out.println((first + 1) + \" \" + (second + 1));\n+ @Override\n+ public int compareTo(Stone s) {\n+ if (this.c < s.c) return -1;\n+ else if (this.c > s.c) return 1;\n+ else if (this.b < s.b) return -1;\n+ else if (this.b > s.b) return 1;\n+ else if (this.a < s.a) return -1;\n+ else if (this.a > s.a) return 1;\n+ else return 0;\n }\n }\n \n- static class Parallelepiped {\n- final int index;\n- final int a, b, c;\n-\n- Parallelepiped(int index, int a, int b, int c) {\n-\n- this.index = index;\n-\n- int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n- int m4 = Math.max(m1, m2),\n- m5 = Math.min(Math.min(m1, m2), m3),\n- m6 = Math.min(Math.min(a, b), c);\n-\n- this.a = m4;\n- this.b = m5;\n- this.c = m6;\n- }\n- }\n-\n- static class L2Map {\n- private Map> map =\n- new HashMap>();\n-\n- void put(Parallelepiped v) {\n-\n- Map map2 = map.get(v.a);\n- if (map2 == null) {\n- map2 = new HashMap();\n- map.put(v.a, map2);\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ while (sc.hasNext()) {\n+ int n = sc.nextInt();\n+ int max = -1;\n+ int index = 0;\n+ Stone[] s = new Stone[n];\n+ int flag = 0;\n+ int jg1 = 0;\n+ int jg2 = 0;\n+ int shu[] = new int[3];\n+ for (int i = 0; i < n; i++) {\n+ shu[0] = sc.nextInt();\n+ shu[1] = sc.nextInt();\n+ shu[2] = sc.nextInt();\n+ Arrays.sort(shu);\n+ s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n+ if (max < shu[0]) {\n+ index = i + 1;\n+ max = shu[0];\n+ }\n }\n-\n- Parallelepiped[] currentVs = map2.get(v.b);\n- if (currentVs == null) {\n- currentVs = new Parallelepiped[2];\n- currentVs[0] = v;\n- map2.put(v.b, currentVs);\n+ Arrays.sort(s);\n+ for (int i = 0; i < n - 1; i++) {\n+ if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n+ int[] bj = new int[3];\n+ bj[0] = s[i].a + s[i + 1].a;\n+ bj[1] = s[i].b;\n+ bj[2] = s[i].c;\n+ Arrays.sort(bj);\n+ if (bj[0] > max) {\n+ flag = 1;\n+ max = bj[0];\n+ jg1 = s[i].position;\n+ jg2 = s[i + 1].position;\n+ }\n+ }\n+ }\n+ if (flag == 1) {\n+ System.out.println(2);\n+ System.out.println(jg1 + \" \" + jg2);\n } else {\n- if (currentVs[0].c < v.c) {\n- currentVs[1] = currentVs[0];\n- currentVs[0] = v;\n- } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n+ System.out.println(1);\n+ System.out.println(index);\n }\n- }\n-\n- Parallelepiped get(Parallelepiped p) {\n- Map map2 = map.get(p.a);\n- if (map2 == null) return null;\n- Parallelepiped[] values = map2.get(p.b);\n- if (values == null) return null;\n- if (values[0] == p) return values[1];\n- else return values[0];\n }\n }\n }", "output": "FASTER 0.9094", "pair_id": "java_9713_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 1.8783} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.*;\n \n public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+ static class Point {\n+ int x, y;\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n+ public int getX() {\n+ return x;\n }\n \n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n+ public int getY() {\n+ return y;\n }\n \n- public void close() throws IOException {\n- bw.close();\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- static class FastReader {\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n+\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n \n- public FastReader() {\n+ public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n }\n return str;\n }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n }\n }", "output": "SLOWER 3.6281", "pair_id": "java_4717_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 12.3642} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n-\n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n- }\n- }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n+ new Solver();\n }\n \n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n-\n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n+ }\n }\n }\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n- }\n- }\n- }\n-\n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n- }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n- }\n- }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- }\n-}", "output": "FASTER 0.736", "pair_id": "java_5735_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.6655} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n import java.io.IOException;\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n \n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n }\n- System.out.println(dp[1][n]);\n+ out.println(ans);\n }\n }\n \n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n+ static class InputReader {\n \n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n \n- return result;\n- }\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n \n- static boolean isPrime(int n) {\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n \n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n- return n * fac(n - 1);\n }\n }", "output": "FASTER 5.2048", "pair_id": "java_183_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 36.88} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class JavaApplication42 {\n+public class Main {\n \n public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n }\n- System.out.println(sum);\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.0734", "pair_id": "java_178_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 33.6702} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class EducationalRound49B {\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ public static void main(String[] args) {\n \n- System.out.println(solve(x, y, n));\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n-\n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n- }\n }", "output": "FASTER 0.7678", "pair_id": "java_5779_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7027} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- private static long N;\n- private static long LAST;\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- LAST = N * N / 2 + (N & 1);\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n }\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- private static long number(long i, long j) {\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n \n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ }\n+\n+ q--;\n+ }\n }\n }", "output": "FASTER 1.3722", "pair_id": "java_5791_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.5887} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n+\n+ x[i] = Integer.parseInt(st.nextToken());\n+\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n }\n \n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n+ }\n+ }\n+ } else {\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n+ break;\n+ }\n+ }\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ }\n }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n- System.out.println();\n-\n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n- }\n- System.out.println();\n-\n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n }\n }", "output": "FASTER 1.78", "pair_id": "java_6815_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.4343} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 4.633", "pair_id": "java_4720_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 24.8134} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n- public static void main(String[] z) {\n- Scanner s = new Scanner(System.in);\n- for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n- m = s.nextInt();\n- Map a = new HashMap();\n- for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n- for (r = 0; m-- > 0; ) {\n- String x = s.next();\n- for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n+public class Main {\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ if (n == 0 && m == 0) break;\n+\n+ String[] a = new String[n];\n+ int[] b = new int[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ a[i] = sc.next();\n+ b[i] = sc.nextInt();\n }\n+\n+ int sum = 0;\n+ int c = 0;\n+ String s = \"\";\n+\n+ for (int i = 0; i < m; i++) {\n+ s = sc.next();\n+ for (int j = 0; j < n; j++) {\n+ c = 0;\n+ while (a[j].codePointAt(c) == 42) c++;\n+ if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n+ }\n+ }\n+ System.out.println(sum);\n }\n }\n }", "output": "FASTER 1.3385", "pair_id": "java_1005_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 2.5289} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class ProblemD {\n+public class Main {\n \n public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n+ }\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.0627", "pair_id": "java_176_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 33.4215} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+ }\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n- }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "FASTER 1.3295", "pair_id": "java_4764_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.5131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class JavaApplication42 {\n-\n+public class Main {\n public static void main(String[] args) {\n-\n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ sum += (i * (i + 1));\n }\n System.out.println(sum);\n }", "output": "FASTER 0.0849", "pair_id": "java_186_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0606} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Test {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n }\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n \n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n }\n \n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n }\n }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n+ out.print(\"NO\");\n }\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n- }\n }", "output": "FASTER 3.3628", "pair_id": "java_4742_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 10.2876} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- String s = sc.next();\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- for (int j = i + max + 1; j < n; j++) {\n- if (0 < s.indexOf(s.substring(i, j), j)) {\n- max = j - i;\n+ int num = Integer.parseInt(sc.next());\n+ String str = sc.next();\n+\n+ int res = 0;\n+ for (int len = num; len > 0; len--) {\n+ int[] dp = new int[num];\n+ for (int i = num - len - 1; i >= 0; i--) {\n+ if (str.charAt(i) == str.charAt(i + len)) {\n+ dp[i] = Math.min(dp[i + 1] + 1, len);\n+ res = Math.max(res, dp[i]);\n } else {\n- break;\n+ dp[i] = 0;\n }\n }\n }\n- System.out.println(max);\n- sc.close();\n+\n+ System.out.println(res);\n }\n }", "output": "SLOWER 0.1451", "pair_id": "java_3824_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.1058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class MyClass {\n+public class Main {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n- System.out.println(ans);\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.1105", "pair_id": "java_189_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0796} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n+public class CF300A {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n+\n for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n }\n \n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n+ break;\n+ }\n+ }\n }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n- System.out.println();\n \n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ int[] num = new int[n];\n+\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n+ }\n }\n- System.out.println();\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n \n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n+ }\n+ pr.flush();\n }\n }", "output": "FASTER 0.044", "pair_id": "java_6820_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.031} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class CF300A {\n+public class ArrayA_300A {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n- int zeros = 0;\n int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n-\n+ int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n+ arr[i] = sc.nextInt();\n+ }\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n- }\n-\n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n- break;\n- }\n+ System.out.println();\n+ } else {\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n }\n-\n- int[] num = new int[n];\n-\n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n- }\n- }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n }\n }", "output": "SLOWER 0.1276", "pair_id": "java_6822_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0925} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class EducationalRound49B {\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- public static void main(String[] args) {\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n- q--;\n- }\n- out.close();\n- }\n-\n- public static PrintWriter out;\n-\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ pw.println(v2);\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.8936", "pair_id": "java_5780_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.8578} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.util.StringTokenizer;\n \n public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n \n public static void main(String[] args) {\n- int n = in.nextInt();\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n+ }\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n }\n \n- out.println(weight);\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n \n- in.close();\n- out.close();\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 5.1043", "pair_id": "java_182_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 34.3999} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class Main {\n+ static long mod = 1000000007;\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n- }\n-\n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n+ c[i][0] = x;\n+ c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n- System.out.println(\"NO\");\n+ pw.print(ans);\n+ pw.flush();\n+ }\n+\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n+ }\n+\n+ return r;\n }\n }\n+\n+class pair {\n+ A f;\n+ B s;\n+\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n+\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+}", "output": "FASTER 0.4447", "pair_id": "java_4702_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.361} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- static boolean check(char[] a, char[] b) {\n- for (int i = 0; i < 8; i++) {\n- if (a[i] != b[i] && a[i] != '*') return false;\n- }\n- return true;\n- }\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n-\n- if (n == 0 && m == 0) break;\n-\n- int money[] = new int[n];\n- int hit = 0;\n- String[] str1 = new String[n];\n- String[] str2 = new String[m];\n- char[][] a = new char[n][];\n- char[][] b = new char[m][];\n-\n- for (int i = 0; i < n; i++) {\n- str1[i] = sc.next();\n- a[i] = str1[i].toCharArray();\n- money[i] = sc.nextInt();\n+class Main {\n+ public static void main(String[] z) {\n+ Scanner s = new Scanner(System.in);\n+ for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n+ m = s.nextInt();\n+ Map a = new HashMap();\n+ for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n+ for (r = 0; m-- > 0; ) {\n+ String x = s.next();\n+ for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n- for (int i = 0; i < m; i++) {\n- str2[i] = sc.next();\n- b[i] = str2[i].toCharArray();\n- }\n-\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- if (check(a[i], b[j])) hit += money[i];\n- }\n- }\n-\n- System.out.println(hit);\n }\n }\n }", "output": "SLOWER 1.5245", "pair_id": "java_1000_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.8768} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n- static void move(int[] shells, int i) {\n- int a, b;\n+public class TaskC {\n \n- if (i % 2 == 0) {\n- a = 1;\n- b = 2;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int[] arr = {0, 0, 0};\n+ int x = sc.nextInt();\n+ arr[x] = 1;\n+ int i = 0;\n+ for (i = n; i > 0 && arr[1] != 1; i--) {\n+ if (i % 2 == 0) {\n+ int t = arr[1];\n+ arr[1] = arr[2];\n+ arr[2] = t;\n+ } else {\n+ int t = arr[0];\n+ arr[0] = arr[1];\n+ arr[1] = t;\n+ }\n+ }\n+ if (i == 0) {\n+ for (int j = 0; j < 3; j++) {\n+ if (arr[j] == 1) {\n+ System.out.println(j);\n+ break;\n+ }\n+ }\n } else {\n- a = 0;\n- b = 1;\n- }\n-\n- int tmp = shells[a];\n- shells[a] = shells[b];\n- shells[b] = tmp;\n- }\n-\n- static String getState(int[] shells, int i) {\n- String state = Integer.toString(i % 2);\n-\n- state += Integer.toString(shells[0]);\n- state += Integer.toString(shells[1]);\n- state += Integer.toString(shells[2]);\n-\n- return state;\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt();\n- int x = in.nextInt();\n-\n- int[] shells = new int[3];\n- shells[x] = 1;\n-\n- ArrayList states = new ArrayList<>();\n-\n- for (int i = n; i >= 0; i--) {\n- String state = getState(shells, i);\n-\n- int idx = states.indexOf(state);\n-\n- if (idx != -1) {\n-\n- break;\n- }\n-\n- states.add(state);\n-\n- if (i > 0) {\n- move(shells, i);\n+ if (i % 2 == 0) {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(2);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(0);\n+ }\n+ } else {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(0);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(2);\n+ }\n }\n }\n \n- int cycleLength = states.size();\n- int r = n % cycleLength;\n-\n- System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n+ sc.close();\n }\n }", "output": "FASTER 0.1446", "pair_id": "java_426_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.1054} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.util.Arrays;\n-import java.util.Scanner;\n+import java.util.NoSuchElementException;\n \n public class Main {\n+ public static class SegmentTree {\n+ int[] tree;\n+\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n+\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n+\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ }\n+ }\n+\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n+\n+ public int query(int a, int b, int k, int l, int r) {\n+\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n \n- int n = in.nextInt(), q = in.nextInt();\n+ } else {\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n+ }\n+ }\n+ }\n \n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n \n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n+ }\n+\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n }\n }\n-\n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n- }\n- return pow2 * 2;\n- }\n-\n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n-\n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n-\n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n- }\n-}", "output": "FASTER 1.579", "pair_id": "java_5725_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.9877} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n+public class Main {\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n \n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+\n+ init(n1);\n+ arr = new int[op_num];\n+\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n+ i1++;\n+ mark++;\n }\n }\n \n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ private static int find(int n1, int n2) {\n+\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n+ }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n+ }\n+\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n+ }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ }\n+\n+ public static void init(int N) {\n+\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n+ }\n }\n }", "output": "SLOWER 0.0062", "pair_id": "java_5747_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.0043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n \n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n \n- String[] a = new String[n];\n- int[] b = new int[n];\n-\n+ HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n- a[i] = sc.next();\n- b[i] = sc.nextInt();\n+ String s = sc.next().replace(\"*\", \".\");\n+ int price = sc.nextInt();\n+ map.put(s, price);\n }\n \n- int sum = 0;\n- int c = 0;\n- String s = \"\";\n-\n+ int ans = 0;\n for (int i = 0; i < m; i++) {\n- s = sc.next();\n- for (int j = 0; j < n; j++) {\n- c = 0;\n- while (a[j].codePointAt(c) == 42) c++;\n- if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n+ String x = sc.next();\n+ for (String s : map.keySet()) {\n+ if (x.matches(s)) {\n+ ans += map.get(s);\n+ break;\n+ }\n }\n }\n- System.out.println(sum);\n+\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 1.1166", "pair_id": "java_1004_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.1684} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n- }\n-\n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n- }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n return;\n }\n }\n }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n try {\n- s = br.readLine();\n+ bufLen = is.read(buf);\n } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n }\n }\n }", "output": "SLOWER 0.7801", "pair_id": "java_4740_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.7172} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class TwoSquares {\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n+\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n+ }\n+ }\n+\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n-\n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n \n for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 5.9528", "pair_id": "java_4722_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 61.9391} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n- }\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n \n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n }\n }\n \n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n+ public int nextInt() {\n return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n }", "output": "SLOWER 1.6607", "pair_id": "java_4756_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.1616} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n- pw.flush();\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n+ }\n }\n }", "output": "FASTER 0.4679", "pair_id": "java_5816_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.3831} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- private static long N;\n- private static long LAST;\n-\n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n-\n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n }\n }\n }\n \n- private static long number(long i, long j) {\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n \n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "FASTER 1.4641", "pair_id": "java_5772_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.7589} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n+public class ProblemD {\n \n public static void main(String[] args) {\n- int n = in.nextInt();\n \n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n- }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0417", "pair_id": "java_197_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0293} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class helloWorld {\n+public class triangulation {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n-\n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n- System.out.println(ans);\n-\n- in.close();\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n+ }\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "SLOWER 0.0016", "pair_id": "java_210_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0011} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n import java.util.Scanner;\n \n public class Main {\n+ static int N = 300005;\n+ static int tree[];\n+\n public static void main(String[] args) {\n+ int n, m;\n Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n+ }\n \n- int n = in.nextInt(), q = in.nextInt();\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n+ }\n+ if (nMax == 1) nMax = 2;\n \n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n- }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n+ } else {\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n-}\n \n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n }\n- return pow2 * 2;\n }\n \n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n \n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n+ if (x > right || y < left) return;\n \n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "SLOWER 0.1702", "pair_id": "java_5746_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.1252} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+public class MyClass {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- }\n-\n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.1058", "pair_id": "java_218_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0761} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class ProblemD {\n-\n- public static void main(String[] args) {\n-\n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n+ }\n+ System.out.println(p);\n }\n }", "output": "SLOWER 0.0088", "pair_id": "java_192_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0061} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n+public class Main {\n+ static int N = 300005;\n+ static int tree[];\n \n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n+ public static void main(String[] args) {\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n+ }\n+\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n+ }\n+ if (nMax == 1) nMax = 2;\n+\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n+\n } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n \n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n+ }\n+ }\n+\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+\n+ if (x > right || y < left) return;\n+\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n+ }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ }\n }\n }", "output": "SLOWER 0.0709", "pair_id": "java_5748_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.0504} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- System.out.println(solve(x, y, n));\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.7894", "pair_id": "java_5758_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7283} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n- }\n- }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n- }\n-\n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n-\n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n- }\n-}\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n+ } else {\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n \n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n- }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n- }\n- }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "SLOWER 0.4607", "pair_id": "java_5741_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.3762} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n- pw.flush();\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n }\n }", "output": "FASTER 0.4796", "pair_id": "java_5811_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.3944} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n-\n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n-\n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n- }\n- }\n-\n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n- }\n-\n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 4.486", "pair_id": "java_4729_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 22.4085} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static void move(int[] shells, int i) {\n- int a, b;\n+public class Test {\n \n- if (i % 2 == 0) {\n- a = 1;\n- b = 2;\n+ public static void main(String[] args) throws Exception {\n+ int[] nums0 = {1, 2, 2, 1, 0, 0};\n+ int[] nums1 = {0, 0, 1, 2, 2, 1};\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int current = sc.nextInt();\n+ int rem = n - (n / 6) * 6;\n+ if (rem == 0) {\n+ System.out.println(current);\n } else {\n- a = 0;\n- b = 1;\n- }\n-\n- int tmp = shells[a];\n- shells[a] = shells[b];\n- shells[b] = tmp;\n- }\n-\n- static String getState(int[] shells, int i) {\n- String state = Integer.toString(i % 2);\n-\n- state += Integer.toString(shells[0]);\n- state += Integer.toString(shells[1]);\n- state += Integer.toString(shells[2]);\n-\n- return state;\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt();\n- int x = in.nextInt();\n-\n- int[] shells = new int[3];\n- shells[x] = 1;\n-\n- ArrayList states = new ArrayList<>();\n-\n- for (int i = n; i >= 0; i--) {\n- String state = getState(shells, i);\n-\n- int idx = states.indexOf(state);\n-\n- if (idx != -1) {\n-\n- break;\n- }\n-\n- states.add(state);\n-\n- if (i > 0) {\n- move(shells, i);\n+ if (nums0[rem - 1] == current) {\n+ System.out.println(\"0\");\n+ } else if (nums1[rem - 1] == current) {\n+ System.out.println(\"1\");\n+ } else {\n+ System.out.println(\"2\");\n }\n }\n-\n- int cycleLength = states.size();\n- int r = n % cycleLength;\n-\n- System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "FASTER 0.0715", "pair_id": "java_428_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0508} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n- }\n- }\n-\n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ pw.flush();\n }\n }", "output": "SLOWER 0.9151", "pair_id": "java_5759_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.8857} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ solve3027();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ public static void solve3027() {\n+ Scanner sc = new Scanner(System.in);\n \n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int N = sc.nextInt();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n \n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ System.out.println(ans);\n \n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n- }\n-\n- System.out.println(i - 1);\n+ sc.close();\n }\n }", "output": "SLOWER 6.7554", "pair_id": "java_7306_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 108.0399} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n+ }\n }\n \n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 5.9528", "pair_id": "java_4722_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 61.9391} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n \n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 4.9762", "pair_id": "java_4739_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 31.4773} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n- }\n-\n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 2.6046", "pair_id": "java_4749_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 6.0823} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n+ solve3027();\n+ }\n+\n+ public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n- }\n- System.out.println(Math.max(count1, count2));\n+\n+ int N = sc.nextInt();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n+\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ System.out.println(ans);\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.0144", "pair_id": "java_7307_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 1.01} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class Main {\n+ static long mod = 1000000007;\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n+ }\n+\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n+ return r;\n+ }\n+}\n \n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n+class pair {\n+ A f;\n+ B s;\n \n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n \n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n }\n-\n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n+ return st.nextToken();\n }\n \n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 1.4212", "pair_id": "java_4704_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.6781} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n+ }\n }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n+\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n+\n+class IntDualSegmentTree {\n+\n+ final int[] Dat;\n+\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n- if (nMax == 1) nMax = 2;\n-\n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n-\n- } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n+ }\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n \n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ }\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n+ }\n+ }\n+ propagate(k);\n+ return Dat[k - N];\n+ }\n+\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n+ }\n+\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n+ } else {\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n+ }\n+ Laz[k] = E1;\n }\n }\n \n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n-\n- if (x > right || y < left) return;\n-\n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n- }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- }\n+ public static void main(String[] args) {\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "FASTER 0.5317", "pair_id": "java_5743_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.4456} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n import java.util.Arrays;\n import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- int n = in.nextInt(), q = in.nextInt();\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n+ }\n+ }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n \n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n+\n+class IntDualSegmentTree {\n+\n+ final int[] Dat;\n+\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n-}\n \n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n- return pow2 * 2;\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n+ }\n+ }\n+ propagate(k);\n+ return Dat[k - N];\n }\n \n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n }\n \n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n+ } else {\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n+ }\n+ Laz[k] = E1;\n+ }\n }\n \n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n+ public static void main(String[] args) {\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "FASTER 0.3615", "pair_id": "java_5740_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.2848} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class TaskC {\n+public class Main {\n+ static void move(int[] shells, int i) {\n+ int a, b;\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int[] arr = {0, 0, 0};\n- int x = sc.nextInt();\n- arr[x] = 1;\n- int i = 0;\n- for (i = n; i > 0 && arr[1] != 1; i--) {\n- if (i % 2 == 0) {\n- int t = arr[1];\n- arr[1] = arr[2];\n- arr[2] = t;\n- } else {\n- int t = arr[0];\n- arr[0] = arr[1];\n- arr[1] = t;\n+ if (i % 2 == 0) {\n+ a = 1;\n+ b = 2;\n+ } else {\n+ a = 0;\n+ b = 1;\n+ }\n+\n+ int tmp = shells[a];\n+ shells[a] = shells[b];\n+ shells[b] = tmp;\n+ }\n+\n+ static String getState(int[] shells, int i) {\n+ String state = Integer.toString(i % 2);\n+\n+ state += Integer.toString(shells[0]);\n+ state += Integer.toString(shells[1]);\n+ state += Integer.toString(shells[2]);\n+\n+ return state;\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner in = new Scanner(System.in);\n+\n+ int n = in.nextInt();\n+ int x = in.nextInt();\n+\n+ int[] shells = new int[3];\n+ shells[x] = 1;\n+\n+ ArrayList states = new ArrayList<>();\n+\n+ for (int i = n; i >= 0; i--) {\n+ String state = getState(shells, i);\n+\n+ int idx = states.indexOf(state);\n+\n+ if (idx != -1) {\n+\n+ break;\n }\n- }\n- if (i == 0) {\n- for (int j = 0; j < 3; j++) {\n- if (arr[j] == 1) {\n- System.out.println(j);\n- break;\n- }\n- }\n- } else {\n- if (i % 2 == 0) {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(2);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(0);\n- }\n- } else {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(0);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(2);\n- }\n+\n+ states.add(state);\n+\n+ if (i > 0) {\n+ move(shells, i);\n }\n }\n \n- sc.close();\n+ int cycleLength = states.size();\n+ int r = n % cycleLength;\n+\n+ System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "SLOWER 0.1446", "pair_id": "java_426_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.1054} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class EducationalRound49B {\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ public static void main(String[] args) {\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n-\n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n }", "output": "SLOWER 0.0215", "pair_id": "java_5751_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.015} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Codechef {\n+public class Main {\n+ static void move(int[] shells, int i) {\n+ int a, b;\n+\n+ if (i % 2 == 0) {\n+ a = 1;\n+ b = 2;\n+ } else {\n+ a = 0;\n+ b = 1;\n+ }\n+\n+ int tmp = shells[a];\n+ shells[a] = shells[b];\n+ shells[b] = tmp;\n+ }\n+\n+ static String getState(int[] shells, int i) {\n+ String state = Integer.toString(i % 2);\n+\n+ state += Integer.toString(shells[0]);\n+ state += Integer.toString(shells[1]);\n+ state += Integer.toString(shells[2]);\n+\n+ return state;\n+ }\n+\n public static void main(String[] args) throws java.lang.Exception {\n- Scanner sc = new Scanner(System.in);\n- int noOfMoves = sc.nextInt();\n- int index = sc.nextInt();\n+ Scanner in = new Scanner(System.in);\n \n- int position = index;\n+ int n = in.nextInt();\n+ int x = in.nextInt();\n \n- for (int i = noOfMoves % 6; i >= 1; i--) {\n- if (i % 2 == 0) {\n- if (position == 2) position = 1;\n- else if (position == 1) position = 2;\n- } else {\n- if (position == 1) position = 0;\n- else if (position == 0) position = 1;\n+ int[] shells = new int[3];\n+ shells[x] = 1;\n+\n+ ArrayList states = new ArrayList<>();\n+\n+ for (int i = n; i >= 0; i--) {\n+ String state = getState(shells, i);\n+\n+ int idx = states.indexOf(state);\n+\n+ if (idx != -1) {\n+\n+ break;\n+ }\n+\n+ states.add(state);\n+\n+ if (i > 0) {\n+ move(shells, i);\n }\n }\n \n- System.out.println(position);\n+ int cycleLength = states.size();\n+ int r = n % cycleLength;\n+\n+ System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "SLOWER 0.1529", "pair_id": "java_423_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.1118} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.Arrays;\n+import java.util.NoSuchElementException;\n \n public class Main {\n+ public static class SegmentTree {\n+ int[] tree;\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n \n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n \n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n \n- public static class SegmentTree {\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n \n- static final long INF = Long.MAX_VALUE / 2;\n+ public int query(int a, int b, int k, int l, int r) {\n \n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n \n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n }\n }\n+ System.out.println();\n+ }\n+ }\n \n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n+ public static void main(String[] args) {\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n \n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n+ } else {\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n }\n }\n }\n \n- public static void main(String[] args) {\n- new Solver();\n- }\n-\n- static class FastScanner {\n+ static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n }\n \n private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n+ return hasNextByte() ? buffer[ptr++] : -1;\n }\n \n- private static boolean isPrintableChar(int c) {\n+ private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n \n b = readByte();\n }\n return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n }\n \n public long nextLong() {\n b = readByte();\n }\n }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n- }\n }\n }", "output": "FASTER 0.4815", "pair_id": "java_5723_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.3962} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class triangulation {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n- System.out.println(p);\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "SLOWER 0.0262", "pair_id": "java_201_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0183} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n+ }\n+ }\n \n public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n-\n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n-\n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n-\n+ new Solver();\n+ }\n+\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n- }\n- }\n- }\n-\n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n- }\n- }\n-\n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n-\n- if (x > right || y < left) return;\n-\n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n- }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n }\n }\n }", "output": "FASTER 1.2677", "pair_id": "java_5739_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.4077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- static int N = 300005;\n- static int tree[];\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n-\n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n-\n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n-\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n \n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n- }\n- }\n-\n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n-\n- if (x > right || y < left) return;\n-\n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n- }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "FASTER 0.0709", "pair_id": "java_5748_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.0504} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner scanner = new Scanner(System.in)) {\n long n = scanner.nextLong();\n int x = scanner.nextInt(), m = scanner.nextInt();\n List list = new ArrayList<>();\n\n Set set = new HashSet<>();\n long next = x % m;\n list.add(next);\n set.add(next);\n while (list.size() < n) {\n next = next * next % m;\n if (set.contains(next)) {\n break;\n }\n set.add(next);\n list.add(next);\n }\n if (list.size() == n) {\n\n System.out.println(list.stream().mapToLong(i -> i).sum());\n } else {\n\n int start = list.indexOf(next);\n\n long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n\n long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n\n long bai = (n - start) / (list.size() - start);\n\n long remain = (n - start) % (list.size() - start);\n System.out.println(\n startSum\n + bai * loop\n + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n\n static int mod = (int) 998244353;\n static List> list = new ArrayList>();\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n long N = sc.nextLong();\n long X = sc.nextInt();\n int M = sc.nextInt();\n\n int[] m = new int[M];\n int[] v = new int[M];\n int s = 0;\n int t = 0;\n long ans = 0;\n if (X == 0) {\n System.out.println(0);\n return;\n }\n boolean flg = false;\n for (int i = 0; i < N; i++) {\n m[i] = (int) (X) % M;\n if (v[m[i]] == 0) {\n v[(int) m[i]] = i;\n } else {\n s = v[m[i]];\n t = i;\n flg = true;\n break;\n }\n ans = ans + m[i];\n X = (X * X) % M;\n }\n\n int d = 0;\n long w = 0;\n int x = 0;\n if (flg) {\n N = N - t;\n d = t - s;\n if (d != 0) w = N / d;\n else w = N;\n if (d != 0) x = (int) (N % d);\n else x = 0;\n }\n X = m[s];\n long sum = 0;\n long[] o = new long[M];\n for (int i = 0; i < d; i++) {\n o[i] = sum + (X) % M;\n X = (X * X) % M;\n sum = o[i];\n }\n\n ans = ans + (w * sum);\n if (x != 0) {\n ans = ans + o[x - 1];\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n-public class Main {\n+class Main {\n+\n+ static int mod = (int) 998244353;\n+ static List> list = new ArrayList>();\n \n public static void main(String[] args) {\n- try (Scanner scanner = new Scanner(System.in)) {\n- long n = scanner.nextLong();\n- int x = scanner.nextInt(), m = scanner.nextInt();\n- List list = new ArrayList<>();\n \n- Set set = new HashSet<>();\n- long next = x % m;\n- list.add(next);\n- set.add(next);\n- while (list.size() < n) {\n- next = next * next % m;\n- if (set.contains(next)) {\n- break;\n- }\n- set.add(next);\n- list.add(next);\n+ Scanner sc = new Scanner(System.in);\n+ long N = sc.nextLong();\n+ long X = sc.nextInt();\n+ int M = sc.nextInt();\n+\n+ int[] m = new int[M];\n+ int[] v = new int[M];\n+ int s = 0;\n+ int t = 0;\n+ long ans = 0;\n+ if (X == 0) {\n+ System.out.println(0);\n+ return;\n+ }\n+ boolean flg = false;\n+ for (int i = 0; i < N; i++) {\n+ m[i] = (int) (X) % M;\n+ if (v[m[i]] == 0) {\n+ v[(int) m[i]] = i;\n+ } else {\n+ s = v[m[i]];\n+ t = i;\n+ flg = true;\n+ break;\n }\n- if (list.size() == n) {\n+ ans = ans + m[i];\n+ X = (X * X) % M;\n+ }\n \n- System.out.println(list.stream().mapToLong(i -> i).sum());\n- } else {\n+ int d = 0;\n+ long w = 0;\n+ int x = 0;\n+ if (flg) {\n+ N = N - t;\n+ d = t - s;\n+ if (d != 0) w = N / d;\n+ else w = N;\n+ if (d != 0) x = (int) (N % d);\n+ else x = 0;\n+ }\n+ X = m[s];\n+ long sum = 0;\n+ long[] o = new long[M];\n+ for (int i = 0; i < d; i++) {\n+ o[i] = sum + (X) % M;\n+ X = (X * X) % M;\n+ sum = o[i];\n+ }\n \n- int start = list.indexOf(next);\n+ ans = ans + (w * sum);\n+ if (x != 0) {\n+ ans = ans + o[x - 1];\n+ }\n \n- long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n-\n- long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n-\n- long bai = (n - start) / (list.size() - start);\n-\n- long remain = (n - start) % (list.size() - start);\n- System.out.println(\n- startSum\n- + bai * loop\n- + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n- }\n- }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.14", "pair_id": "java_5947_forward", "problem_id": "p02550", "language": "java", "direction": "forward", "speedup_ratio": 1.1019} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class ProblemD {\n+\n public static void main(String[] args) {\n+\n Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n- }\n- System.out.println(sum);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "SLOWER 0.0742", "pair_id": "java_184_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0528} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R733_D {\n public static void main(String[] args) {\n InputReader in = new InputReader(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = in.nextInt();\n int max = 0;\n int k = 0;\n int[] ans = new int[2];\n int[][] recs = new int[n][3];\n HashMap map = new HashMap<>();\n for (int i = 0; i < n; i++) {\n recs[i][0] = in.nextInt();\n recs[i][1] = in.nextInt();\n recs[i][2] = in.nextInt();\n Arrays.sort(recs[i]);\n boolean toAdd1 = false;\n boolean toAdd2 = false;\n boolean toAdd3 = false;\n if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][1]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][2] > recs[index][2]) {\n toAdd1 = true;\n }\n } else {\n toAdd1 = true;\n }\n if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][1], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][0] > recs[index][0]) {\n toAdd2 = true;\n }\n } else {\n toAdd2 = true;\n }\n if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n int index = map.get(new Pair(recs[i][0], recs[i][2]));\n int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n if (temp > max) {\n max = temp;\n k = 2;\n ans[0] = index;\n ans[1] = i;\n }\n if (recs[i][1] > recs[index][1]) {\n toAdd3 = true;\n }\n } else {\n toAdd3 = true;\n }\n int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n if (temp > max) {\n max = temp;\n k = 1;\n ans[0] = i;\n }\n if (toAdd1) {\n map.put(new Pair(recs[i][0], recs[i][1]), i);\n }\n if (toAdd2) {\n map.put(new Pair(recs[i][1], recs[i][2]), i);\n }\n if (toAdd3) {\n map.put(new Pair(recs[i][0], recs[i][2]), i);\n }\n }\n out.println(k);\n for (int i = 0; i < k; i++) {\n out.print((ans[i] + 1) + \" \");\n }\n out.flush();\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\nclass Pair {\n int x;\n int y;\n\n Pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public boolean equals(Object obj) {\n return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n }\n\n @Override\n public int hashCode() {\n return (x + y + 1) * (x + y) / 2 + y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class R733_D {\n- public static void main(String[] args) {\n- InputReader in = new InputReader(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = in.nextInt();\n- int max = 0;\n- int k = 0;\n- int[] ans = new int[2];\n- int[][] recs = new int[n][3];\n- HashMap map = new HashMap<>();\n- for (int i = 0; i < n; i++) {\n- recs[i][0] = in.nextInt();\n- recs[i][1] = in.nextInt();\n- recs[i][2] = in.nextInt();\n- Arrays.sort(recs[i]);\n- boolean toAdd1 = false;\n- boolean toAdd2 = false;\n- boolean toAdd3 = false;\n- if (map.containsKey(new Pair(recs[i][0], recs[i][1]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][1]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2] + recs[index][2]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][2] > recs[index][2]) {\n- toAdd1 = true;\n- }\n- } else {\n- toAdd1 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][1], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][1], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][1], recs[i][2]), recs[i][0] + recs[index][0]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][0] > recs[index][0]) {\n- toAdd2 = true;\n- }\n- } else {\n- toAdd2 = true;\n- }\n- if (map.containsKey(new Pair(recs[i][0], recs[i][2]))) {\n- int index = map.get(new Pair(recs[i][0], recs[i][2]));\n- int temp = Math.min(Math.min(recs[i][0], recs[i][2]), recs[i][1] + recs[index][1]);\n- if (temp > max) {\n- max = temp;\n- k = 2;\n- ans[0] = index;\n- ans[1] = i;\n- }\n- if (recs[i][1] > recs[index][1]) {\n- toAdd3 = true;\n- }\n- } else {\n- toAdd3 = true;\n- }\n- int temp = Math.min(Math.min(recs[i][0], recs[i][1]), recs[i][2]);\n- if (temp > max) {\n- max = temp;\n- k = 1;\n- ans[0] = i;\n- }\n- if (toAdd1) {\n- map.put(new Pair(recs[i][0], recs[i][1]), i);\n- }\n- if (toAdd2) {\n- map.put(new Pair(recs[i][1], recs[i][2]), i);\n- }\n- if (toAdd3) {\n- map.put(new Pair(recs[i][0], recs[i][2]), i);\n+public class Main {\n+ static HashMap map;\n+ static HashMap pos;\n+\n+ static void update(long value, int temp, int i) {\n+ if (!map.containsKey(value)) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n+ } else {\n+ int val = map.get(value);\n+ if (temp > val) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n }\n }\n- out.println(k);\n- for (int i = 0; i < k; i++) {\n- out.print((ans[i] + 1) + \" \");\n- }\n- out.flush();\n }\n \n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n+ static int det(long temp) {\n+ if (!map.containsKey(temp)) return 0;\n+ return map.get(temp);\n+ }\n \n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n+ public static void main(String[] args) throws Exception {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int n = Integer.parseInt(br.readLine());\n+ StringTokenizer st;\n+ map = new HashMap<>();\n+ pos = new HashMap<>();\n+ long mod = (long) 1E9 + 7;\n+ int ans = 0;\n+ int single = -1;\n+ int next = -1;\n+ int postemp = -1;\n+ for (int i = 1; i <= n; i++) {\n+ st = new StringTokenizer(br.readLine());\n+ int a = Integer.parseInt(st.nextToken());\n+ int b = Integer.parseInt(st.nextToken());\n+ int c = Integer.parseInt(st.nextToken());\n+ int min = Math.min(a, Math.min(b, c));\n+ if (ans < min) {\n+ ans = min;\n+ single = i;\n+ next = -1;\n+ }\n+ int val = det(Math.min(a, b) * mod + Math.max(a, b));\n+ if (val > 0) {\n+ postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n+ val = Math.min(a, Math.min(b, val + c));\n+ if (ans < val) {\n+ ans = val;\n+ single = i;\n+ next = postemp;\n }\n }\n- return tokenizer.nextToken();\n+ int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n+ if (val1 > 0) {\n+ postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n+ val1 = Math.min(a, Math.min(c, b + val1));\n+ if (ans < val1) {\n+ ans = val1;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n+ if (val2 > 0) {\n+ postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n+ val2 = Math.min(b, Math.min(c, a + val2));\n+ if (ans < val2) {\n+ ans = val2;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n+ update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n+ update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n+ if (next == -1) {\n+ System.out.println(\"1\");\n+ System.out.println(single);\n+ return;\n }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ System.out.println(\"2\");\n+ System.out.println(single + \" \" + next);\n }\n }\n-\n-class Pair {\n- int x;\n- int y;\n-\n- Pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- return this.x == ((Pair) obj).x && this.y == ((Pair) obj).y;\n- }\n-\n- @Override\n- public int hashCode() {\n- return (x + y + 1) * (x + y) / 2 + y;\n- }\n-}", "output": "FASTER 0.6477", "pair_id": "java_9720_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 1.5667} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n- x -= a;\n- while (b <= x) {\n- x -= b;\n- }\n- System.out.println(x);\n+\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+\n+ System.out.println((X - A) % B);\n }\n }", "output": "FASTER 0.0703", "pair_id": "java_6632_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0499} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class TwoSquares {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n- }\n+ Scanner s = new Scanner(System.in);\n \n- static class TaskE {\n- class pair {\n- double x, y;\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n \n- pair(double a, double b) {\n- x = a;\n- y = b;\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n+ }\n+\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n \n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 4.7142", "pair_id": "java_4746_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 26.2484} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n- return st.nextToken();\n- }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "FASTER 0.0383", "pair_id": "java_5800_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0269} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class newProgram5 {\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- public static void main(String[] args) throws IOException {\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n \n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n \n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n \n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n+ public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public String next() throws IOException {\n- return nextToken();\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- public String nli() throws IOException {\n+ String nextLine() {\n+ String str = \"\";\n try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n- return null;\n+ return str;\n }\n \n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n }\n }\n }\n-}\n \n-class Point {\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n \n- double x, y;\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n \n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 0.147", "pair_id": "java_4713_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.1073} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ static class sort implements Comparable {\n+ int a, b, c;\n+\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n \n- System.out.println(m + no);\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n }\n+ pw.println(ans);\n }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.6758", "pair_id": "java_5756_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5975} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n-\n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- pw.flush();\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n }\n }", "output": "FASTER 0.251", "pair_id": "java_5810_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.19} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int num = Integer.parseInt(sc.next());\n- String str = sc.next();\n-\n- int res = 0;\n- for (int len = num; len > 0; len--) {\n- int[] dp = new int[num];\n- for (int i = num - len - 1; i >= 0; i--) {\n- if (str.charAt(i) == str.charAt(i + len)) {\n- dp[i] = Math.min(dp[i + 1] + 1, len);\n- res = Math.max(res, dp[i]);\n- } else {\n- dp[i] = 0;\n- }\n+ int N = sc.nextInt();\n+ String S = sc.next();\n+ sc.close();\n+ int r = -1;\n+ String s = \"\";\n+ long ans = 0;\n+ for (int l = 0; l < N; l++) {\n+ while (l - 1 > r) {\n+ r++;\n }\n+ while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n+ s += S.charAt(r + 1);\n+ r++;\n+ }\n+ ans = Math.max(r - l + 1, ans);\n+ if (s.length() >= 2) s = s.substring(1);\n+ else if (s.length() == 1) s = \"\";\n }\n-\n- System.out.println(res);\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.3926", "pair_id": "java_3834_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.3128} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] argc) {\n+ public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n-\n- System.out.println((x - a) % b);\n+ System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n }", "output": "FASTER 0.005", "pair_id": "java_6639_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0035} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class Main {\n- static long mod = 1000000007;\n-\n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n- }\n-\n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n-\n- return r;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n \n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n }\n }\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 0.5918", "pair_id": "java_4703_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.5071} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.util.HashMap;\n-import java.util.Map;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n+import java.util.TreeMap;\n \n-public class Skulptor2 {\n+public class ProblemD {\n \n- public static void main(String[] args) {\n- Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n- int n = scan.nextInt();\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt(), a[] = new int[3];\n+ int ans = 0, k[] = new int[2];\n+ TreeMap map = new TreeMap<>();\n+ for (int i = 0; i < n; i++) {\n+ a[0] = sc.nextInt();\n+ a[1] = sc.nextInt();\n+ a[2] = sc.nextInt();\n+ Arrays.sort(a);\n \n- L2Map map = new L2Map();\n- Parallelepiped[] data = new Parallelepiped[n];\n-\n- for (int i = 0; i < n; i++) {\n- int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n- Parallelepiped p = new Parallelepiped(i, a, b, c);\n- data[i] = p;\n- map.put(p);\n- }\n-\n- int maxDiameter = -1;\n- int first = -1, second = -1;\n-\n- for (Parallelepiped p : data) {\n- if (p.c > maxDiameter) {\n- maxDiameter = p.c;\n- first = p.index;\n- second = -1;\n- }\n-\n- Parallelepiped p2 = map.get(p);\n- if (p2 != null) {\n- int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n- if (d > maxDiameter) {\n- first = p.index;\n- second = p2.index;\n- maxDiameter = d;\n+ if (!map.containsKey(new Pair(a[1], a[2]))) {\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ if (ans < a[0]) {\n+ ans = a[0];\n+ k[0] = i;\n+ k[1] = -1;\n+ }\n+ } else {\n+ Pair x = map.get(new Pair(a[1], a[2]));\n+ if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n+ ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n+ k[0] = x.first;\n+ k[1] = i;\n+ }\n+ if (x.second < a[0]) {\n+ map.remove(x);\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n \n- if (second == -1) {\n- System.out.println(1);\n- System.out.println(first + 1);\n+ if (k[1] == -1) {\n+ pw.println(1);\n+ pw.println(k[0] + 1);\n } else {\n- System.out.println(2);\n- System.out.println((first + 1) + \" \" + (second + 1));\n+ pw.println(2);\n+ pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n+ }\n+ pw.flush();\n+ pw.close();\n+ }\n+\n+ static class Pair implements Comparable {\n+ int first, second;\n+\n+ public Pair(int f, int s) {\n+ first = f;\n+ second = s;\n+ }\n+\n+ @Override\n+ public int compareTo(Pair pair) {\n+ return first == pair.first ? second - pair.second : first - pair.first;\n+ }\n+\n+ public String toString() {\n+ return (\"First: \" + first + \" second: \" + second);\n }\n }\n \n- static class Parallelepiped {\n- final int index;\n- final int a, b, c;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- Parallelepiped(int index, int a, int b, int c) {\n-\n- this.index = index;\n-\n- int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n- int m4 = Math.max(m1, m2),\n- m5 = Math.min(Math.min(m1, m2), m3),\n- m6 = Math.min(Math.min(a, b), c);\n-\n- this.a = m4;\n- this.b = m5;\n- this.c = m6;\n- }\n- }\n-\n- static class L2Map {\n- private Map> map =\n- new HashMap>();\n-\n- void put(Parallelepiped v) {\n-\n- Map map2 = map.get(v.a);\n- if (map2 == null) {\n- map2 = new HashMap();\n- map.put(v.a, map2);\n- }\n-\n- Parallelepiped[] currentVs = map2.get(v.b);\n- if (currentVs == null) {\n- currentVs = new Parallelepiped[2];\n- currentVs[0] = v;\n- map2.put(v.b, currentVs);\n- } else {\n- if (currentVs[0].c < v.c) {\n- currentVs[1] = currentVs[0];\n- currentVs[0] = v;\n- } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n- }\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n \n- Parallelepiped get(Parallelepiped p) {\n- Map map2 = map.get(p.a);\n- if (map2 == null) return null;\n- Parallelepiped[] values = map2.get(p.b);\n- if (values == null) return null;\n- if (values[0] == p) return values[1];\n- else return values[0];\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "SLOWER 2.111", "pair_id": "java_9719_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 4.32} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class A5 {\n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextLong();\n- int x = in.nextInt();\n- int[] a = new int[] {0, 0, 0};\n- a[x] = 1;\n- n %= 6;\n+public class Codechef {\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner sc = new Scanner(System.in);\n+ int noOfMoves = sc.nextInt();\n+ int index = sc.nextInt();\n \n- for (long i = n; i > 0; --i) {\n- if (i % 2 == 1) {\n- int t = a[0];\n- a[0] = a[1];\n- a[1] = t;\n+ int position = index;\n+\n+ for (int i = noOfMoves % 6; i >= 1; i--) {\n+ if (i % 2 == 0) {\n+ if (position == 2) position = 1;\n+ else if (position == 1) position = 2;\n } else {\n- int t = a[1];\n- a[1] = a[2];\n- a[2] = t;\n+ if (position == 1) position = 0;\n+ else if (position == 0) position = 1;\n }\n }\n- System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n+\n+ System.out.println(position);\n }\n }", "output": "SLOWER 0.0363", "pair_id": "java_415_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ static int N = 300005;\n+ static int tree[];\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n-\n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n-\n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n- }\n+ public static void main(String[] args) {\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n }\n \n- public static class SegmentTree {\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n+ }\n+ if (nMax == 1) nMax = 2;\n \n- static final long INF = Long.MAX_VALUE / 2;\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n-\n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n- }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n+ } else {\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n \n- public static void main(String[] args) {\n- new Solver();\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n+ }\n }\n \n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n \n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n+ if (x > right || y < left) return;\n+\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "SLOWER 1.2677", "pair_id": "java_5739_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.4077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n+ }\n+ }\n+ }\n \n public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n-\n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n-\n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n-\n- } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n- }\n- }\n- }\n-\n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n- }\n- }\n-\n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n-\n- if (x > right || y < left) return;\n-\n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n- }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n }\n }\n }", "output": "FASTER 1.4705", "pair_id": "java_5734_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.7711} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ static boolean check(char[] a, char[] b) {\n+ for (int i = 0; i < 8; i++) {\n+ if (a[i] != b[i] && a[i] != '*') return false;\n+ }\n+ return true;\n+ }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n+\n if (n == 0 && m == 0) break;\n \n- String[] a = new String[n];\n- int[] b = new int[n];\n+ int money[] = new int[n];\n+ int hit = 0;\n+ String[] str1 = new String[n];\n+ String[] str2 = new String[m];\n+ char[][] a = new char[n][];\n+ char[][] b = new char[m][];\n \n for (int i = 0; i < n; i++) {\n- a[i] = sc.next();\n- b[i] = sc.nextInt();\n+ str1[i] = sc.next();\n+ a[i] = str1[i].toCharArray();\n+ money[i] = sc.nextInt();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ str2[i] = sc.next();\n+ b[i] = str2[i].toCharArray();\n }\n \n- int sum = 0;\n- int c = 0;\n- String s = \"\";\n-\n- for (int i = 0; i < m; i++) {\n- s = sc.next();\n- for (int j = 0; j < n; j++) {\n- c = 0;\n- while (a[j].codePointAt(c) == 42) c++;\n- if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ if (check(a[i], b[j])) hit += money[i];\n }\n }\n- System.out.println(sum);\n+\n+ System.out.println(hit);\n }\n }\n }", "output": "FASTER 0.186", "pair_id": "java_998_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 1.1376} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n+ }\n+ }\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n }\n+ return st.nextToken();\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.6149", "pair_id": "java_5765_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5315} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n \n public class Main {\n+ static int N = 300005;\n+ static int tree[];\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n+ }\n \n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n- }\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n }\n- sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n- }\n+ if (nMax == 1) nMax = 2;\n \n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n- }\n-}\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n+ } else {\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n \n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n- }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n }\n }\n \n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+\n+ if (x > right || y < left) return;\n+\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n+ }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ }\n }\n }", "output": "SLOWER 0.5317", "pair_id": "java_5743_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.4456} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class helloWorld {\n- public static void main(String[] args) {\n+public class a1140 {\n+ public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n-\n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n- System.out.println(ans);\n-\n- in.close();\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n+ }\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.0247", "pair_id": "java_200_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0173} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ solve3027();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ public static void solve3027() {\n+ Scanner sc = new Scanner(System.in);\n \n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int N = sc.nextInt();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n \n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ System.out.println(ans);\n \n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n- }\n-\n- System.out.println(i - 1);\n+ sc.close();\n }\n }", "output": "SLOWER 6.7404", "pair_id": "java_7304_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 106.9183} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n boolean nextBoolean() {\n return Boolean.parseBoolean(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws IOException {\n FastReader fr = new FastReader();\n int n = fr.nextInt();\n int a = fr.nextInt() - 1;\n int x = fr.nextInt() - 1;\n int b = fr.nextInt() - 1;\n int y = fr.nextInt() - 1;\n\n int i = a;\n int j = b;\n while (true) {\n\n if (i == j) {\n System.out.println(\"YES\");\n return;\n } else if (i == x || j == y) {\n System.out.println(\"NO\");\n return;\n } else {\n i = (i + 1) % (n);\n j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int x = sc.nextInt();\n int b = sc.nextInt();\n int y = sc.nextInt();\n int t1 = 0, t2 = 0;\n int count = 0, count1, count2;\n for (int i = 0; i < n * 20; i++) {\n count1 = 0;\n count2 = 0;\n if (a == b && t1 == t2) {\n count = 1;\n System.out.println(\"YES\");\n break;\n }\n if (a == x || b == y) break;\n if (a < n) a++;\n else a = 1;\n if (b > 1) b--;\n else b = n;\n t1++;\n t2++;\n }\n if (count == 0) System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n public class Main {\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int x = sc.nextInt();\n+ int b = sc.nextInt();\n+ int y = sc.nextInt();\n+ int t1 = 0, t2 = 0;\n+ int count = 0, count1, count2;\n+ for (int i = 0; i < n * 20; i++) {\n+ count1 = 0;\n+ count2 = 0;\n+ if (a == b && t1 == t2) {\n+ count = 1;\n+ System.out.println(\"YES\");\n+ break;\n+ }\n+ if (a == x || b == y) break;\n+ if (a < n) a++;\n+ else a = 1;\n+ if (b > 1) b--;\n+ else b = n;\n+ t1++;\n+ t2++;\n }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- boolean nextBoolean() {\n- return Boolean.parseBoolean(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws IOException {\n- FastReader fr = new FastReader();\n- int n = fr.nextInt();\n- int a = fr.nextInt() - 1;\n- int x = fr.nextInt() - 1;\n- int b = fr.nextInt() - 1;\n- int y = fr.nextInt() - 1;\n-\n- int i = a;\n- int j = b;\n- while (true) {\n-\n- if (i == j) {\n- System.out.println(\"YES\");\n- return;\n- } else if (i == x || j == y) {\n- System.out.println(\"NO\");\n- return;\n- } else {\n- i = (i + 1) % (n);\n- j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n- }\n- }\n+ if (count == 0) System.out.println(\"NO\");\n }\n }", "output": "SLOWER 5.8277", "pair_id": "java_5828_reversed", "problem_id": "1169_A", "language": "java", "direction": "reversed", "speedup_ratio": 56.7971} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n }\n \n- pw.flush();\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ }\n+\n+ q--;\n+ }\n }\n }", "output": "FASTER 0.8124", "pair_id": "java_5789_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7561} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Main {\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- private static Scanner sc;\n- private static Printer pr;\n-\n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n-\n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n-\n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n-\n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n-\n- pr.println(ruq.find(index));\n- pr.flush();\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n+ } else {\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n-\n- static final int NULL = -1;\n-\n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n- }\n-\n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n- }\n-\n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n- } else {\n- return data[index];\n- }\n- }\n- }\n-\n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n-\n- solve();\n-\n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "SLOWER 1.3995", "pair_id": "java_5732_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.6381} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n+import java.util.Arrays;\n+import java.util.HashMap;\n+import java.util.Random;\n import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- String s = in.next();\n+ int N = scanner.nextInt();\n+ char[] s = scanner.next().toCharArray();\n+ int[] M = {999_999_937, 1_000_000_007};\n+ int B = new Random().nextInt(999_999_937);\n+ int left = 0;\n+ int right = N / 2 + 1;\n+ while (right - left > 1) {\n+ int mid = (left + right) / 2;\n+ if (possible(s, mid, N, B, M)) left = mid;\n+ else right = mid;\n+ }\n+ System.out.println(left);\n+ }\n \n- HashSet set = new HashSet<>();\n-\n- int len = 1;\n- int lenMax = 0;\n- for (int st = 0; st + len - 1 < n; st++) {\n- String temp = s.substring(st, st + len);\n-\n- while (s.indexOf(temp, st + len) > st) {\n- len++;\n- temp = s.substring(st, st + len);\n+ private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n+ long[] bn = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ bn[i] = 1;\n+ for (int j = 0; j < K - 1; j++) {\n+ bn[i] *= B;\n+ bn[i] %= M[i];\n }\n- lenMax = Math.max(lenMax, len - 1);\n }\n \n- System.out.println(lenMax);\n- in.close();\n+ HashMap occurrences = new HashMap<>();\n+ long[] hash = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ hash[i] = hash(s, K, B, M[i]);\n+ }\n+ occurrences.put(new Tuple(hash), 0);\n+ for (int i = 1; i <= N - K; i++) {\n+ for (int j = 0; j < M.length; j++) {\n+ hash[j] -= s[i - 1] * bn[j] % M[j];\n+ if (hash[j] < 0) hash[j] += M[j];\n+ hash[j] *= B;\n+ hash[j] %= M[j];\n+ hash[j] += s[i + K - 1];\n+ if (hash[j] >= M[j]) hash[j] -= M[j];\n+ }\n+ Tuple key = new Tuple(hash);\n+ if (occurrences.containsKey(key)) {\n+ if (occurrences.get(key) + K <= i) return true;\n+ } else occurrences.put(key, i);\n+ }\n+ return false;\n+ }\n+\n+ private static long hash(char[] s, int len, int B, int M) {\n+ if (s.length < len)\n+ throw new IllegalArgumentException(\n+ \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n+ long hash = 0;\n+ for (int i = 0; i < len; i++) {\n+ hash *= B;\n+ hash %= M;\n+ hash += s[i];\n+ if (hash >= M) hash -= M;\n+ }\n+ return hash;\n+ }\n+\n+ private static class Tuple {\n+ private final long[] elements;\n+\n+ private Tuple(long[] elements) {\n+ this.elements = Arrays.copyOf(elements, elements.length);\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Tuple tuple = (Tuple) o;\n+ return Arrays.equals(elements, tuple.elements);\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return Arrays.hashCode(elements);\n+ }\n }\n }", "output": "SLOWER 0.1916", "pair_id": "java_3829_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.142} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n+\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n }\n- return st.nextToken();\n+\n+ if (neg) return -ret;\n+ return ret;\n }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n }\n \n- float nextFloat() {\n- return Float.parseFloat(next());\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n }\n \n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ }\n+\n+ q--;\n }\n }\n }", "output": "FASTER 0.5614", "pair_id": "java_5785_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.4757} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n }\n+ return st.nextToken();\n }\n \n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n }\n }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n+ }\n }", "output": "FASTER 5.2888", "pair_id": "java_4721_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 39.0914} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static long N;\n-\n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n-\n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n }\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n- if (size == -1) return NC;\n- bId = 0;\n }\n- return (char) buf[bId++];\n+ return st.nextToken();\n }\n \n public int nextInt() {\n- return (int) nextLong();\n+ return Integer.parseInt(next());\n }\n \n public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n+ return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.1489", "pair_id": "java_5764_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1087} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n+ }\n+ }\n+ }\n \n public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n-\n- init(n1);\n- arr = new int[op_num];\n-\n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n- } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n- }\n- i1++;\n- mark++;\n- }\n- }\n-\n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n- }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n- }\n-\n- public static void update(int a, int b, int k, int l, int r, int mark) {\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n- }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n-\n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n }\n }\n }", "output": "FASTER 1.4057", "pair_id": "java_5733_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.6494} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class EducationalRound49B {\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- public static void main(String[] args) {\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n+ System.out.println(solve(x, y, n));\n }\n- out.close();\n }\n \n- public static PrintWriter out;\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n- return st.nextToken();\n }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.7678", "pair_id": "java_5779_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7027} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] argc) {\n+class Main {\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n \n- System.out.println((x - a) % b);\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+\n+ System.out.println((X - A) % B);\n }\n }", "output": "FASTER 0.1274", "pair_id": "java_6634_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0923} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.IOException;\n import java.util.*;\n \n-public class helloWorld {\n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n+public class Main {\n \n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n+ }\n+ }\n \n- System.out.println(ans);\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n \n- in.close();\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1086", "pair_id": "java_213_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0782} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n- static void move(int[] shells, int i) {\n- int a, b;\n+public class A5 {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextLong();\n+ int x = in.nextInt();\n+ int[] a = new int[] {0, 0, 0};\n+ a[x] = 1;\n+ n %= 6;\n \n- if (i % 2 == 0) {\n- a = 1;\n- b = 2;\n- } else {\n- a = 0;\n- b = 1;\n- }\n-\n- int tmp = shells[a];\n- shells[a] = shells[b];\n- shells[b] = tmp;\n- }\n-\n- static String getState(int[] shells, int i) {\n- String state = Integer.toString(i % 2);\n-\n- state += Integer.toString(shells[0]);\n- state += Integer.toString(shells[1]);\n- state += Integer.toString(shells[2]);\n-\n- return state;\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt();\n- int x = in.nextInt();\n-\n- int[] shells = new int[3];\n- shells[x] = 1;\n-\n- ArrayList states = new ArrayList<>();\n-\n- for (int i = n; i >= 0; i--) {\n- String state = getState(shells, i);\n-\n- int idx = states.indexOf(state);\n-\n- if (idx != -1) {\n-\n- break;\n- }\n-\n- states.add(state);\n-\n- if (i > 0) {\n- move(shells, i);\n+ for (long i = n; i > 0; --i) {\n+ if (i % 2 == 1) {\n+ int t = a[0];\n+ a[0] = a[1];\n+ a[1] = t;\n+ } else {\n+ int t = a[1];\n+ a[1] = a[2];\n+ a[2] = t;\n }\n }\n-\n- int cycleLength = states.size();\n- int r = n % cycleLength;\n-\n- System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n+ System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "FASTER 0.1892", "pair_id": "java_419_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.1401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int x = sc.nextInt();\n int b = sc.nextInt();\n int y = sc.nextInt();\n int t1 = 0, t2 = 0;\n int count = 0, count1, count2;\n for (int i = 0; i < n * 20; i++) {\n count1 = 0;\n count2 = 0;\n if (a == b && t1 == t2) {\n count = 1;\n System.out.println(\"YES\");\n break;\n }\n if (a == x || b == y) break;\n if (a < n) a++;\n else a = 1;\n if (b > 1) b--;\n else b = n;\n t1++;\n t2++;\n }\n if (count == 0) System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ACircleMetro solver = new ACircleMetro();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ACircleMetro {\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int a = in.nextInt();\n int x = in.nextInt();\n int b = in.nextInt();\n int y = in.nextInt();\n boolean flag = false;\n while (a != x && b != y) {\n if (a == n) a = 1;\n else a++;\n if (b == 1) b = n;\n else b--;\n if (a == b) {\n flag = true;\n break;\n }\n }\n if (flag) out.println(\"YES\");\n else out.println(\"NO\");\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int x = sc.nextInt();\n- int b = sc.nextInt();\n- int y = sc.nextInt();\n- int t1 = 0, t2 = 0;\n- int count = 0, count1, count2;\n- for (int i = 0; i < n * 20; i++) {\n- count1 = 0;\n- count2 = 0;\n- if (a == b && t1 == t2) {\n- count = 1;\n- System.out.println(\"YES\");\n- break;\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ACircleMetro solver = new ACircleMetro();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class ACircleMetro {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int a = in.nextInt();\n+ int x = in.nextInt();\n+ int b = in.nextInt();\n+ int y = in.nextInt();\n+ boolean flag = false;\n+ while (a != x && b != y) {\n+ if (a == n) a = 1;\n+ else a++;\n+ if (b == 1) b = n;\n+ else b--;\n+ if (a == b) {\n+ flag = true;\n+ break;\n+ }\n }\n- if (a == x || b == y) break;\n- if (a < n) a++;\n- else a = 1;\n- if (b > 1) b--;\n- else b = n;\n- t1++;\n- t2++;\n+ if (flag) out.println(\"YES\");\n+ else out.println(\"NO\");\n }\n- if (count == 0) System.out.println(\"NO\");\n }\n }", "output": "SLOWER 0.0095", "pair_id": "java_5830_reversed", "problem_id": "1169_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0066} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n+ int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n+ x -= a;\n+ while (b <= x) {\n+ x -= b;\n+ }\n+ System.out.println(x);\n }\n }", "output": "FASTER 0.0521", "pair_id": "java_6636_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0368} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Array {\n+public class ArrayA_300A {\n+\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n- int[] arr = new int[n];\n- int plus = 0;\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n+ arr[i] = sc.nextInt();\n }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n- }\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n+ System.out.println();\n } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n- }\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n }\n- print(neg);\n- print(pos);\n- print(z);\n- }\n-\n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n- System.out.println();\n- return;\n }\n }", "output": "SLOWER 0.1194", "pair_id": "java_6826_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0863} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Array {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n- int[] arr = new int[n];\n- int plus = 0;\n- for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n- }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n- }\n- }\n- } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n- }\n- }\n- }\n- print(neg);\n- print(pos);\n- print(z);\n- }\n+public class R181D2A {\n \n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n- System.out.println();\n- return;\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n }\n }\n+\n+class gao {\n+\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n+\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n+ }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ }\n+}", "output": "SLOWER 0.0245", "pair_id": "java_6823_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0171} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n import java.io.BufferedReader;\n-import java.io.InputStream;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n- }\n-\n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n- }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 5.1417", "pair_id": "java_4730_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 35.3026} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ static int N = 300005;\n+ static int tree[];\n \n- private static Scanner sc;\n- private static Printer pr;\n+ public static void main(String[] args) {\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n+ }\n \n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n+ }\n+ if (nMax == 1) nMax = 2;\n \n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n-\n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n-\n- pr.println(ruq.find(index));\n- pr.flush();\n+ } else {\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n-\n- static final int NULL = -1;\n-\n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n- }\n-\n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n- }\n-\n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n- } else {\n- return data[index];\n- }\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n }\n }\n \n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n \n- solve();\n+ if (x > right || y < left) return;\n \n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "SLOWER 1.4705", "pair_id": "java_5734_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.7711} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n+public class Main {\n+\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n-\n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "SLOWER 0.079", "pair_id": "java_5802_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0563} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n-\n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n- }\n- pw.println(v2);\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- pw.flush();\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n+ }\n }\n }", "output": "FASTER 0.2393", "pair_id": "java_5815_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1804} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n \n public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n-\n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n-\n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n- }\n- }\n-\n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n- }\n-\n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "FASTER 2.6144", "pair_id": "java_4750_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 6.1236} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class ArrayA_300A {\n+public class R181D2A {\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int arr[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = sc.nextInt();\n- }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println();\n- } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- }\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n }\n }\n+\n+class gao {\n+\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n+\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n+ }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ }\n+}", "output": "FASTER 0.0949", "pair_id": "java_6829_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.068} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class A5 {\n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextLong();\n- int x = in.nextInt();\n- int[] a = new int[] {0, 0, 0};\n- a[x] = 1;\n- n %= 6;\n+public class Test {\n \n- for (long i = n; i > 0; --i) {\n- if (i % 2 == 1) {\n- int t = a[0];\n- a[0] = a[1];\n- a[1] = t;\n+ public static void main(String[] args) throws Exception {\n+ int[] nums0 = {1, 2, 2, 1, 0, 0};\n+ int[] nums1 = {0, 0, 1, 2, 2, 1};\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int current = sc.nextInt();\n+ int rem = n - (n / 6) * 6;\n+ if (rem == 0) {\n+ System.out.println(current);\n+ } else {\n+ if (nums0[rem - 1] == current) {\n+ System.out.println(\"0\");\n+ } else if (nums1[rem - 1] == current) {\n+ System.out.println(\"1\");\n } else {\n- int t = a[1];\n- a[1] = a[2];\n- a[2] = t;\n+ System.out.println(\"2\");\n }\n }\n- System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "SLOWER 0.1177", "pair_id": "java_417_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.085} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- static boolean check(char[] a, char[] b) {\n- for (int i = 0; i < 8; i++) {\n- if (a[i] != b[i] && a[i] != '*') return false;\n- }\n- return true;\n- }\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n \n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n-\n if (n == 0 && m == 0) break;\n \n- int money[] = new int[n];\n- int hit = 0;\n- String[] str1 = new String[n];\n- String[] str2 = new String[m];\n- char[][] a = new char[n][];\n- char[][] b = new char[m][];\n-\n+ HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n- str1[i] = sc.next();\n- a[i] = str1[i].toCharArray();\n- money[i] = sc.nextInt();\n- }\n- for (int i = 0; i < m; i++) {\n- str2[i] = sc.next();\n- b[i] = str2[i].toCharArray();\n+ String s = sc.next().replace(\"*\", \".\");\n+ int price = sc.nextInt();\n+ map.put(s, price);\n }\n \n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- if (check(a[i], b[j])) hit += money[i];\n+ int ans = 0;\n+ for (int i = 0; i < m; i++) {\n+ String x = sc.next();\n+ for (String s : map.keySet()) {\n+ if (x.matches(s)) {\n+ ans += map.get(s);\n+ break;\n+ }\n }\n }\n \n- System.out.println(hit);\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 1.3026", "pair_id": "java_999_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 2.4667} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class EducationalRound49B {\n-\n- public static void main(String[] args) {\n-\n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n- }\n- out.close();\n- }\n-\n- public static PrintWriter out;\n-\n- public static class FastReader {\n- BufferedReader br;\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n StringTokenizer st;\n \n public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n- while (st == null || !st.hasMoreTokens()) {\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return Integer.parseInt(next());\n }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n }\n \n long nextLong() {\n return Long.parseLong(next());\n }\n \n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n String nextLine() {\n String str = \"\";\n try {\n- str = br.readLine();\n- } catch (Exception e) {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n+\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n+ }\n }", "output": "SLOWER 0.6427", "pair_id": "java_5776_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5612} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n public class Main {\n- static long mod = 1000000007;\n-\n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n+\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n+ }\n+ }\n+\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n+\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- return r;\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 5.0777", "pair_id": "java_4710_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 33.7714} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n+public class C {\n+ static class Point {\n+ int x, y;\n+\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+\n+ public int getX() {\n+ return x;\n }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n+ }\n+\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n+\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n return;\n }\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n+\n+ System.out.println(\"NO\");\n }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n }\n }\n- return true;\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n }\n \n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n }\n \n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n }\n \n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "SLOWER 4.326", "pair_id": "java_4696_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 20.0571} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n+ }\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n+ long n = nextLong();\n+ int q = nextInt();\n \n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n \n- if (neg) return -ret;\n- return ret;\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n \n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n+ pw.close();\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- long ans = 0, end = 0;\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n \n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n \n- q--;\n- }\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.1027", "pair_id": "java_5752_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0738} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class MyClass {\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- System.out.println(ans);\n+\n+ out.println(weight);\n+\n+ in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.0053", "pair_id": "java_217_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0037} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n-\n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n- }\n-\n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 3.6468", "pair_id": "java_4736_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 12.5251} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- solve3027();\n- }\n \n- public static void solve3027() {\n- Scanner sc = new Scanner(System.in);\n+ public static void main(String[] args) throws IOException {\n \n- int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n- System.out.println(ans);\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n \n- sc.close();\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n+ }\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7404", "pair_id": "java_7304_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 106.9183} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- if (n == 0 && m == 0) break;\n-\n- String[] a = new String[n];\n- int[] b = new int[n];\n-\n+ public static void main(String[] arg) {\n+ Scanner in = new Scanner(System.in);\n+ char[][] numbers = new char[100][];\n+ int[] eqVal = new int[100];\n+ for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n+ int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n- a[i] = sc.next();\n- b[i] = sc.nextInt();\n+ numbers[i] = in.next().toCharArray();\n+ eqVal[i] = in.nextInt();\n }\n-\n- int sum = 0;\n- int c = 0;\n- String s = \"\";\n-\n+ int val = 0;\n for (int i = 0; i < m; i++) {\n- s = sc.next();\n- for (int j = 0; j < n; j++) {\n- c = 0;\n- while (a[j].codePointAt(c) == 42) c++;\n- if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n+ char[] hNum = in.next().toCharArray();\n+ for (int index = 0; index < n; index++) {\n+ boolean isMuch = true;\n+ for (int keta = 0; keta < 8; keta++) {\n+ if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n+ isMuch = false;\n+ break;\n+ }\n+ }\n+ if (isMuch) {\n+ val += eqVal[index];\n+ break;\n+ }\n }\n }\n- System.out.println(sum);\n+ System.out.println(val);\n }\n }\n }", "output": "FASTER 0.1431", "pair_id": "java_1001_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 1.1043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n+ }\n+ }\n+\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- String next() {\n+ public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n- st = new StringTokenizer(bf.readLine());\n+ st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n return st.nextToken();\n }\n \n- int nextInt() {\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n+ public long nextLong() {\n return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n }\n }\n }", "output": "FASTER 0.6532", "pair_id": "java_5766_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5727} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class Array {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n- int[] arr = new int[n];\n- int plus = 0;\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n+\n+ x[i] = Integer.parseInt(st.nextToken());\n+\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n+\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n }\n }\n } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n+ break;\n }\n }\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ }\n }\n- print(neg);\n- print(pos);\n- print(z);\n- }\n-\n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n- System.out.println();\n- return;\n }\n }", "output": "FASTER 1.7442", "pair_id": "java_6813_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.3502} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- String s = in.next();\n-\n- HashSet set = new HashSet<>();\n-\n- int len = 1;\n- int lenMax = 0;\n- for (int st = 0; st + len - 1 < n; st++) {\n- String temp = s.substring(st, st + len);\n-\n- while (s.indexOf(temp, st + len) > st) {\n- len++;\n- temp = s.substring(st, st + len);\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ String s = sc.next();\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ for (int j = i + max + 1; j < n; j++) {\n+ if (0 < s.indexOf(s.substring(i, j), j)) {\n+ max = j - i;\n+ } else {\n+ break;\n+ }\n }\n- lenMax = Math.max(lenMax, len - 1);\n }\n-\n- System.out.println(lenMax);\n- in.close();\n+ System.out.println(max);\n+ sc.close();\n }\n }", "output": "FASTER 0.0429", "pair_id": "java_3823_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.0302} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n out.close();\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n+ return true;\n }\n \n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 1.9366", "pair_id": "java_4694_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.8279} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n-\n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.4796", "pair_id": "java_5811_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.3944} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n- static long mod = 1000000007;\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n+ }\n+\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n+ }\n+ }\n+\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n }\n }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n- }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n- return r;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 5.7335", "pair_id": "java_4711_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 53.2039} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n\n static int mod = (int) 998244353;\n static List> list = new ArrayList>();\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n long N = sc.nextLong();\n long X = sc.nextInt();\n int M = sc.nextInt();\n\n int[] m = new int[M];\n int[] v = new int[M];\n int s = 0;\n int t = 0;\n long ans = 0;\n if (X == 0) {\n System.out.println(0);\n return;\n }\n boolean flg = false;\n for (int i = 0; i < N; i++) {\n m[i] = (int) (X) % M;\n if (v[m[i]] == 0) {\n v[(int) m[i]] = i;\n } else {\n s = v[m[i]];\n t = i;\n flg = true;\n break;\n }\n ans = ans + m[i];\n X = (X * X) % M;\n }\n\n int d = 0;\n long w = 0;\n int x = 0;\n if (flg) {\n N = N - t;\n d = t - s;\n if (d != 0) w = N / d;\n else w = N;\n if (d != 0) x = (int) (N % d);\n else x = 0;\n }\n X = m[s];\n long sum = 0;\n long[] o = new long[M];\n for (int i = 0; i < d; i++) {\n o[i] = sum + (X) % M;\n X = (X * X) % M;\n sum = o[i];\n }\n\n ans = ans + (w * sum);\n if (x != 0) {\n ans = ans + o[x - 1];\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n\n Scanner sc = new Scanner(System.in);\n long k = sc.nextLong();\n int x = sc.nextInt();\n int m = sc.nextInt();\n\n Set set = new HashSet();\n List list = new ArrayList();\n int now = x;\n set.add(now);\n list.add(now);\n int last = 0;\n for (long i = 0; i < k; i++) {\n now = (int) ((long) now * now % m);\n if (set.contains(now)) {\n last = now;\n break;\n } else {\n set.add(now);\n list.add(now);\n }\n }\n\n int loop_idx = 0;\n for (int i = 0; i < list.size(); i++) {\n if (list.get(i) == last) {\n loop_idx = i;\n }\n }\n\n long ans = 0;\n\n for (int i = 0; i < loop_idx; i++) {\n ans += list.get(i);\n }\n k -= loop_idx;\n\n long loop_sum = 0;\n for (int i = loop_idx; i < list.size(); i++) {\n loop_sum += list.get(i);\n }\n long len = list.size() - loop_idx;\n long block = k / len;\n ans += loop_sum * block;\n k %= len;\n\n for (int i = loop_idx; i < loop_idx + k; i++) {\n ans += list.get(i);\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n-\n- static int mod = (int) 998244353;\n- static List> list = new ArrayList>();\n-\n- public static void main(String[] args) {\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n \n Scanner sc = new Scanner(System.in);\n- long N = sc.nextLong();\n- long X = sc.nextInt();\n- int M = sc.nextInt();\n+ long k = sc.nextLong();\n+ int x = sc.nextInt();\n+ int m = sc.nextInt();\n \n- int[] m = new int[M];\n- int[] v = new int[M];\n- int s = 0;\n- int t = 0;\n- long ans = 0;\n- if (X == 0) {\n- System.out.println(0);\n- return;\n- }\n- boolean flg = false;\n- for (int i = 0; i < N; i++) {\n- m[i] = (int) (X) % M;\n- if (v[m[i]] == 0) {\n- v[(int) m[i]] = i;\n+ Set set = new HashSet();\n+ List list = new ArrayList();\n+ int now = x;\n+ set.add(now);\n+ list.add(now);\n+ int last = 0;\n+ for (long i = 0; i < k; i++) {\n+ now = (int) ((long) now * now % m);\n+ if (set.contains(now)) {\n+ last = now;\n+ break;\n } else {\n- s = v[m[i]];\n- t = i;\n- flg = true;\n- break;\n+ set.add(now);\n+ list.add(now);\n }\n- ans = ans + m[i];\n- X = (X * X) % M;\n }\n \n- int d = 0;\n- long w = 0;\n- int x = 0;\n- if (flg) {\n- N = N - t;\n- d = t - s;\n- if (d != 0) w = N / d;\n- else w = N;\n- if (d != 0) x = (int) (N % d);\n- else x = 0;\n- }\n- X = m[s];\n- long sum = 0;\n- long[] o = new long[M];\n- for (int i = 0; i < d; i++) {\n- o[i] = sum + (X) % M;\n- X = (X * X) % M;\n- sum = o[i];\n+ int loop_idx = 0;\n+ for (int i = 0; i < list.size(); i++) {\n+ if (list.get(i) == last) {\n+ loop_idx = i;\n+ }\n }\n \n- ans = ans + (w * sum);\n- if (x != 0) {\n- ans = ans + o[x - 1];\n+ long ans = 0;\n+\n+ for (int i = 0; i < loop_idx; i++) {\n+ ans += list.get(i);\n+ }\n+ k -= loop_idx;\n+\n+ long loop_sum = 0;\n+ for (int i = loop_idx; i < list.size(); i++) {\n+ loop_sum += list.get(i);\n+ }\n+ long len = list.size() - loop_idx;\n+ long block = k / len;\n+ ans += loop_sum * block;\n+ k %= len;\n+\n+ for (int i = loop_idx; i < loop_idx + k; i++) {\n+ ans += list.get(i);\n }\n \n System.out.println(ans);", "output": "SLOWER 0.0331", "pair_id": "java_5946_reversed", "problem_id": "p02550", "language": "java", "direction": "reversed", "speedup_ratio": 1.0232} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n- }\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n \n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n }\n \n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n \n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- static class InputReader {\n+ static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- s = br.readLine();\n+ st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n \n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n+ int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ long nextLong() {\n return Long.parseLong(next());\n }\n \n- public double nextDouble() {\n+ double nextDouble() {\n return Double.parseDouble(next());\n }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 1.2386", "pair_id": "java_4715_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.3597} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- private static long N;\n- private static long LAST;\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n \n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- private static long number(long i, long j) {\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n+ long n = nextLong();\n+ int q = nextInt();\n \n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n+ }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 1.475", "pair_id": "java_5761_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.7798} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n StringTokenizer st;\n \n public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n- st = new StringTokenizer(br.readLine());\n+ st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n \n int nextInt() {\n return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n }\n \n long nextLong() {\n String nextLine() {\n String str = \"\";\n try {\n- str = br.readLine();\n+ str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "FASTER 0.0116", "pair_id": "java_5807_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0081} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n+import java.io.Closeable;\n import java.io.IOException;\n import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n-\n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n- }\n-\n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "SLOWER 1.0422", "pair_id": "java_4733_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.0593} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n+public class Array {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n+ int[] arr = new int[n];\n+ int plus = 0;\n for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n }\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n+ }\n+ }\n+ } else {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n+ }\n+ }\n+ }\n+ print(neg);\n+ print(pos);\n+ print(z);\n+ }\n \n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n- }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n-\n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n- }\n- System.out.println();\n-\n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n+ return;\n }\n }", "output": "FASTER 0.0358", "pair_id": "java_6824_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0251} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n-\n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n }\n }\n-\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n out.close();\n }\n \n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n+\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n+\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n }", "output": "FASTER 1.6745", "pair_id": "java_4693_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 3.192} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class second {\n+public class B {\n+\n+ private static long N;\n+ private static long LAST;\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n+\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n- pw.flush();\n+ }\n+\n+ private static long number(long i, long j) {\n+\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 0.3312", "pair_id": "java_5827_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.2581} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.*;\n+import java.util.*;\n \n-public class B {\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- static long N;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n \n- System.out.println(nBef + cc + colSt);\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n+ return str;\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ public static void main(String[] args) throws java.lang.Exception {\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n+ System.out.println(m + no);\n }\n }\n }", "output": "SLOWER 0.516", "pair_id": "java_5794_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.43} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.util.*;\n \n-public class JavaApplication42 {\n+public class Main {\n \n- public static void main(String[] args) {\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n+ }\n+ }\n \n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n }\n- System.out.println(sum);\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1313", "pair_id": "java_209_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0953} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class B {\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ static long N;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n+\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n+\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n }\n }\n }", "output": "FASTER 0.5044", "pair_id": "java_5793_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.4185} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n-public class helloWorld {\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n- int ans = 0;\n \n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n+ }\n \n- System.out.println(ans);\n+ out.println(weight);\n \n in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.0082", "pair_id": "java_212_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0057} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class ProblemD {\n+public class JavaApplication42 {\n \n public static void main(String[] args) {\n \n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n+ }\n+ System.out.println(sum);\n }\n }", "output": "SLOWER 0.0106", "pair_id": "java_193_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n }\n+ return st.nextToken();\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "SLOWER 0.0383", "pair_id": "java_5800_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0269} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n \n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n+ public static void main(String[] args) {\n \n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+\n+ init(n1);\n+ arr = new int[op_num];\n+\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n+ } else {\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n+ i1++;\n+ mark++;\n }\n }\n \n- public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n+ private static int find(int n1, int n2) {\n \n- } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n- }\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n }\n \n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n \n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ }\n \n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n+ public static void init(int N) {\n \n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n }", "output": "SLOWER 1.6844", "pair_id": "java_5727_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 3.2141} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] argc) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n-\n- System.out.println((x - a) % b);\n+ int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n+ x -= a;\n+ while (b <= x) {\n+ x -= b;\n+ }\n+ System.out.println(x);\n }\n }", "output": "FASTER 0.0571", "pair_id": "java_6637_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0404} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n- pw.println(v2);\n+\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n-\n- pw.flush();\n }\n }", "output": "FASTER 0.2894", "pair_id": "java_5804_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.2221} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class B {\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ private static long N;\n+ private static long LAST;\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ private static long number(long i, long j) {\n \n- long n = nextLong();\n- int q = nextInt();\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 1.475", "pair_id": "java_5761_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.7798} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n-\n- pw.println(\"NO\");\n- pw.close();\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "FASTER 0.0219", "pair_id": "java_4758_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.0153} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class triangulation {\n+public class JavaApplication42 {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n+\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n- out.println(sum);\n- out.close();\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.0242", "pair_id": "java_206_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0169} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n \n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n \n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+ if (neg) return -ret;\n+ return ret;\n+ }\n \n- gone = gone + j / 2;\n- } else {\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n \n- gone = gone + ((i - 1) / 2 * N);\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n \n- gone = gone + (j + 1) / 2;\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n+ }\n \n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+ if (neg) return -ret;\n+ return ret;\n+ }\n \n- gone = gone + (j + 1) / 2;\n- } else {\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n \n- gone = gone + ((i - 1) / 2) * N;\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n \n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n+\n+ q--;\n }\n }\n }", "output": "FASTER 0.6021", "pair_id": "java_5787_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5179} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n-\n-public class TwoSquares {\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n-\n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n- }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "FASTER 1.3513", "pair_id": "java_4761_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.5515} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n+\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n- }\n- }\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "SLOWER 0.6149", "pair_id": "java_5765_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5315} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class R181D2A {\n+public class Demo {\n \n- public static void main(String[] args) throws Exception {\n- new gao().hugao();\n+ public static void main(String[] args) {\n+\n+ int n, n1, n2, n3;\n+ Scanner sc = new Scanner(System.in);\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n+ int[] arr = new int[n];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+ arr[i] = sc.nextInt();\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n+ }\n+ }\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n+ }\n+\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n+ }\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n+ }\n+ }\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n }\n-}\n \n-class gao {\n-\n- Scanner in = new Scanner(System.in);\n- List li;\n- List ll;\n-\n- void hugao() throws Exception {\n- int n = in.nextInt();\n- int ze = 0, tag = 0, y = 0;\n- li = new ArrayList();\n- ll = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- if (x == 0) ze++;\n- else if (x < 0) {\n- if (tag == 0) {\n- y = x;\n- tag = 1;\n- } else ll.add(x);\n- } else li.add(x);\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n- int z = ll.size();\n- if ((ll.size() & 1) > 0) z--;\n- System.out.println(1 + \" \" + y);\n- System.out.print(li.size() + z);\n- for (int x : li) System.out.print(\" \" + x);\n- for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n- System.out.println(\"\");\n- System.out.print(ze + ll.size() - z);\n- for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n- for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n }", "output": "SLOWER 0.0362", "pair_id": "java_6828_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0254} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- System.out.println(solve(x, y, n));\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n+ q--;\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.6866", "pair_id": "java_5788_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.6095} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class worldTour {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n Queue q = new LinkedList();\n ArrayList> neigh = new ArrayList>();\n boolean[][] con = new boolean[n][n];\n int m = sc.nextInt();\n\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n con[u][v] = true;\n }\n\n int[][] dis = new int[n][n];\n for (int i = 0; i < n; i++) {\n neigh.add(new ArrayList());\n for (int j = 0; j < n; j++) {\n if (con[i][j]) neigh.get(i).add(j);\n if (i != j) dis[i][j] = Integer.MAX_VALUE;\n }\n }\n\n for (int i = 0; i < n; i++) {\n boolean[] vis = new boolean[n];\n q.add(i);\n vis[i] = true;\n while (q.peek() != null) {\n int v = q.poll();\n for (int k = 0; k < neigh.get(v).size(); k++) {\n int j = neigh.get(v).get(k);\n if (!vis[j]) {\n q.add(j);\n vis[j] = true;\n dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n }\n }\n }\n }\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n }\n }\n int[][] prefout = new int[n][3];\n int[][] prefin = new int[n][3];\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n max = dis[i][j];\n index = j;\n }\n }\n prefout[i][2] = index;\n }\n\n for (int i = 0; i < n; i++) {\n int max = -1;\n int index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][0] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][1] = index;\n max = -1;\n index = -1;\n for (int j = 0; j < n; j++) {\n if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n max = dis[j][i];\n index = j;\n }\n }\n prefin[i][2] = index;\n }\n\n int maxDis = -1;\n int[] path = new int[4];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < n; j++) {\n if (i == j) continue;\n if (dis[i][j] < 0) continue;\n int IF = 0;\n int JF = 0;\n int IS = 1;\n int JS = 1;\n if (prefin[i][0] == j) IF = 1;\n if (prefout[j][0] == i) JF = 1;\n if (prefin[i][IF + 1] == j) IS = 2;\n if (prefout[j][JF + 1] == i) JS = 2;\n int u = prefin[i][IF];\n int v = prefout[j][JF];\n if (u < 0 || v < 0) continue;\n if (u != v) {\n int D = dis[u][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n } else {\n int uu = prefin[i][IS];\n int vv = prefin[j][JS];\n int D;\n if (uu >= 0 && uu != v) {\n D = dis[uu][i] + dis[i][j] + dis[j][v];\n if (D > maxDis) {\n maxDis = D;\n path[0] = uu;\n path[1] = i;\n path[2] = j;\n path[3] = v;\n }\n }\n if (vv >= 0 && vv != u) {\n D = dis[u][i] + dis[i][j] + dis[j][vv];\n if (D > maxDis) {\n maxDis = D;\n path[0] = u;\n path[1] = i;\n path[2] = j;\n path[3] = vv;\n }\n }\n }\n }\n }\n System.out.println(\n (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n City[] cities = new City[n];\n for (int i = 0; i < n; ++i) {\n cities[i] = new City(i);\n }\n for (int i = 0; i < m; ++i) {\n City a = cities[in.nextInt() - 1];\n City b = cities[in.nextInt() - 1];\n a.outgo.add(b);\n }\n int[][] dd = new int[n][n];\n City[] q = new City[n];\n for (int i = 0; i < n; ++i) {\n for (City x : cities) {\n x.dist = -1;\n }\n cities[i].dist = 0;\n int qt = 0;\n int qh = 1;\n q[0] = cities[i];\n while (qt < qh) {\n City cur = q[qt++];\n for (City other : cur.outgo) {\n if (other.dist < 0) {\n other.dist = cur.dist + 1;\n q[qh++] = other;\n }\n }\n }\n for (int j = 0; j < n; ++j) {\n dd[i][j] = cities[j].dist;\n }\n }\n\n int[] first = new int[n];\n int[] next = new int[n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[i][j];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestOut[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[j][i];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestIn[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n\n City ra = null;\n City rb = null;\n City rc = null;\n City rd = null;\n int res = 0;\n\n for (City b : cities) {\n b.mark = true;\n for (City c : cities)\n if (!c.mark) {\n int bc = dd[b.index][c.index];\n if (bc < 0) continue;\n c.mark = true;\n for (City a : b.closestIn)\n if (a != null && !a.mark) {\n int ab = dd[a.index][b.index];\n if (ab < 0) continue;\n a.mark = true;\n for (City d : c.closestOut)\n if (d != null && !d.mark) {\n int cd = dd[c.index][d.index];\n if (cd < 0) continue;\n d.mark = true;\n int cur = ab + bc + cd;\n if (cur > res) {\n res = cur;\n ra = a;\n rb = b;\n rc = c;\n rd = d;\n }\n d.mark = false;\n }\n a.mark = false;\n }\n c.mark = false;\n }\n b.mark = false;\n }\n\n out.println(\n (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n\n static class City {\n int index;\n int dist;\n List outgo = new ArrayList<>(1);\n boolean mark = false;\n City[] closestIn = new City[3];\n City[] closestOut = new City[3];\n\n public City(int index) {\n this.index = index;\n }\n }\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.List;\n+import java.util.StringTokenizer;\n \n-public class worldTour {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- Queue q = new LinkedList();\n- ArrayList> neigh = new ArrayList>();\n- boolean[][] con = new boolean[n][n];\n- int m = sc.nextInt();\n+ static class TaskB {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ City[] cities = new City[n];\n+ for (int i = 0; i < n; ++i) {\n+ cities[i] = new City(i);\n+ }\n+ for (int i = 0; i < m; ++i) {\n+ City a = cities[in.nextInt() - 1];\n+ City b = cities[in.nextInt() - 1];\n+ a.outgo.add(b);\n+ }\n+ int[][] dd = new int[n][n];\n+ City[] q = new City[n];\n+ for (int i = 0; i < n; ++i) {\n+ for (City x : cities) {\n+ x.dist = -1;\n+ }\n+ cities[i].dist = 0;\n+ int qt = 0;\n+ int qh = 1;\n+ q[0] = cities[i];\n+ while (qt < qh) {\n+ City cur = q[qt++];\n+ for (City other : cur.outgo) {\n+ if (other.dist < 0) {\n+ other.dist = cur.dist + 1;\n+ q[qh++] = other;\n+ }\n+ }\n+ }\n+ for (int j = 0; j < n; ++j) {\n+ dd[i][j] = cities[j].dist;\n+ }\n+ }\n \n- for (int i = 0; i < m; i++) {\n- int u = sc.nextInt() - 1;\n- int v = sc.nextInt() - 1;\n- con[u][v] = true;\n- }\n-\n- int[][] dis = new int[n][n];\n- for (int i = 0; i < n; i++) {\n- neigh.add(new ArrayList());\n- for (int j = 0; j < n; j++) {\n- if (con[i][j]) neigh.get(i).add(j);\n- if (i != j) dis[i][j] = Integer.MAX_VALUE;\n- }\n- }\n-\n- for (int i = 0; i < n; i++) {\n- boolean[] vis = new boolean[n];\n- q.add(i);\n- vis[i] = true;\n- while (q.peek() != null) {\n- int v = q.poll();\n- for (int k = 0; k < neigh.get(v).size(); k++) {\n- int j = neigh.get(v).get(k);\n- if (!vis[j]) {\n- q.add(j);\n- vis[j] = true;\n- dis[i][j] = Math.min(dis[i][v] + 1, dis[i][j]);\n+ int[] first = new int[n];\n+ int[] next = new int[n];\n+ for (int i = 0; i < n; ++i) {\n+ Arrays.fill(first, -1);\n+ for (int j = 0; j < n; ++j) {\n+ int cd = dd[i][j];\n+ if (cd < 0) continue;\n+ next[j] = first[cd];\n+ first[cd] = j;\n+ }\n+ int ptr = 0;\n+ outer:\n+ for (int cd = n - 1; cd >= 1; --cd) {\n+ int cur = first[cd];\n+ while (cur >= 0) {\n+ cities[i].closestOut[ptr] = cities[cur];\n+ ++ptr;\n+ if (ptr == 3) break outer;\n+ cur = next[cur];\n }\n }\n }\n- }\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < n; j++) {\n- if (dis[i][j] == Integer.MAX_VALUE) dis[i][j] = -1;\n- }\n- }\n- int[][] prefout = new int[n][3];\n- int[][] prefin = new int[n][3];\n-\n- for (int i = 0; i < n; i++) {\n- int max = -1;\n- int index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max) {\n- max = dis[i][j];\n- index = j;\n+ for (int i = 0; i < n; ++i) {\n+ Arrays.fill(first, -1);\n+ for (int j = 0; j < n; ++j) {\n+ int cd = dd[j][i];\n+ if (cd < 0) continue;\n+ next[j] = first[cd];\n+ first[cd] = j;\n }\n- }\n- prefout[i][0] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max && j != prefout[i][0]) {\n- max = dis[i][j];\n- index = j;\n- }\n- }\n- prefout[i][1] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[i][j] > max && j != prefout[i][0] && j != prefout[i][1]) {\n- max = dis[i][j];\n- index = j;\n- }\n- }\n- prefout[i][2] = index;\n- }\n-\n- for (int i = 0; i < n; i++) {\n- int max = -1;\n- int index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][0] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max && j != prefin[i][0]) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][1] = index;\n- max = -1;\n- index = -1;\n- for (int j = 0; j < n; j++) {\n- if (i != j && dis[j][i] > max && j != prefin[i][0] && j != prefin[i][1]) {\n- max = dis[j][i];\n- index = j;\n- }\n- }\n- prefin[i][2] = index;\n- }\n-\n- int maxDis = -1;\n- int[] path = new int[4];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < n; j++) {\n- if (i == j) continue;\n- if (dis[i][j] < 0) continue;\n- int IF = 0;\n- int JF = 0;\n- int IS = 1;\n- int JS = 1;\n- if (prefin[i][0] == j) IF = 1;\n- if (prefout[j][0] == i) JF = 1;\n- if (prefin[i][IF + 1] == j) IS = 2;\n- if (prefout[j][JF + 1] == i) JS = 2;\n- int u = prefin[i][IF];\n- int v = prefout[j][JF];\n- if (u < 0 || v < 0) continue;\n- if (u != v) {\n- int D = dis[u][i] + dis[i][j] + dis[j][v];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = u;\n- path[1] = i;\n- path[2] = j;\n- path[3] = v;\n- }\n- } else {\n- int uu = prefin[i][IS];\n- int vv = prefin[j][JS];\n- int D;\n- if (uu >= 0 && uu != v) {\n- D = dis[uu][i] + dis[i][j] + dis[j][v];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = uu;\n- path[1] = i;\n- path[2] = j;\n- path[3] = v;\n- }\n- }\n- if (vv >= 0 && vv != u) {\n- D = dis[u][i] + dis[i][j] + dis[j][vv];\n- if (D > maxDis) {\n- maxDis = D;\n- path[0] = u;\n- path[1] = i;\n- path[2] = j;\n- path[3] = vv;\n- }\n+ int ptr = 0;\n+ outer:\n+ for (int cd = n - 1; cd >= 1; --cd) {\n+ int cur = first[cd];\n+ while (cur >= 0) {\n+ cities[i].closestIn[ptr] = cities[cur];\n+ ++ptr;\n+ if (ptr == 3) break outer;\n+ cur = next[cur];\n }\n }\n }\n+\n+ City ra = null;\n+ City rb = null;\n+ City rc = null;\n+ City rd = null;\n+ int res = 0;\n+\n+ for (City b : cities) {\n+ b.mark = true;\n+ for (City c : cities)\n+ if (!c.mark) {\n+ int bc = dd[b.index][c.index];\n+ if (bc < 0) continue;\n+ c.mark = true;\n+ for (City a : b.closestIn)\n+ if (a != null && !a.mark) {\n+ int ab = dd[a.index][b.index];\n+ if (ab < 0) continue;\n+ a.mark = true;\n+ for (City d : c.closestOut)\n+ if (d != null && !d.mark) {\n+ int cd = dd[c.index][d.index];\n+ if (cd < 0) continue;\n+ d.mark = true;\n+ int cur = ab + bc + cd;\n+ if (cur > res) {\n+ res = cur;\n+ ra = a;\n+ rb = b;\n+ rc = c;\n+ rd = d;\n+ }\n+ d.mark = false;\n+ }\n+ a.mark = false;\n+ }\n+ c.mark = false;\n+ }\n+ b.mark = false;\n+ }\n+\n+ out.println(\n+ (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n- System.out.println(\n- (path[0] + 1) + \" \" + (path[1] + 1) + \" \" + (path[2] + 1) + \" \" + (path[3] + 1));\n+\n+ static class City {\n+ int index;\n+ int dist;\n+ List outgo = new ArrayList<>(1);\n+ boolean mark = false;\n+ City[] closestIn = new City[3];\n+ City[] closestOut = new City[3];\n+\n+ public City(int index) {\n+ this.index = index;\n+ }\n+ }\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 1.3578", "pair_id": "java_6749_forward", "problem_id": "666_B", "language": "java", "direction": "forward", "speedup_ratio": 2.563} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n }\n \n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n \n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n+ return st.nextToken();\n }\n \n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n }\n+ return true;\n }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n \n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n- return false;\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "SLOWER 0.2621", "pair_id": "java_4732_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.1992} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class Demo {\n-\n+public class Array {\n public static void main(String[] args) {\n-\n- int n, n1, n2, n3;\n- Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n int[] arr = new int[n];\n-\n- for (int i = 0; i < arr.length; i++) {\n- arr[i] = sc.nextInt();\n-\n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n+ int plus = 0;\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n+ }\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n+ }\n+ }\n+ } else {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n+ }\n }\n }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n- }\n-\n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n-\n- for (int i = 0; i < arr.length; i++) {\n-\n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n- }\n- }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n+ print(neg);\n+ print(pos);\n+ print(z);\n }\n \n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println(\"\");\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.println();\n+ return;\n }\n }", "output": "FASTER 0.0607", "pair_id": "java_6825_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class B {\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ static long N;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n+\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n+ return (char) buf[bId++];\n+ }\n \n- System.out.println(m + no);\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n }\n }\n }", "output": "FASTER 0.516", "pair_id": "java_5794_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.43} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class Test {\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n+ }\n+\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n+\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n break;\n }\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n \n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n \n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n- }\n }", "output": "FASTER 0.9734", "pair_id": "java_4753_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.9634} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- String S = sc.next();\n- sc.close();\n- int r = -1;\n- String s = \"\";\n- long ans = 0;\n- for (int l = 0; l < N; l++) {\n- while (l - 1 > r) {\n- r++;\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ String s = in.next();\n+\n+ HashSet set = new HashSet<>();\n+\n+ int len = 1;\n+ int lenMax = 0;\n+ for (int st = 0; st + len - 1 < n; st++) {\n+ String temp = s.substring(st, st + len);\n+\n+ while (s.indexOf(temp, st + len) > st) {\n+ len++;\n+ temp = s.substring(st, st + len);\n }\n- while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n- s += S.charAt(r + 1);\n- r++;\n- }\n- ans = Math.max(r - l + 1, ans);\n- if (s.length() >= 2) s = s.substring(1);\n- else if (s.length() == 1) s = \"\";\n+ lenMax = Math.max(lenMax, len - 1);\n }\n- System.out.println(ans);\n+\n+ System.out.println(lenMax);\n+ in.close();\n }\n }", "output": "FASTER 0.4948", "pair_id": "java_3831_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.4091} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class ProblemD {\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n \n public static void main(String[] args) {\n+ int n = in.nextInt();\n \n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n+ }\n+\n+ out.println(weight);\n+\n+ in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.0417", "pair_id": "java_197_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0293} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class B {\n+public class Main {\n \n- static long N;\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n+ long diff = ((N * N) + 1) / 2;\n \n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n \n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n- }\n- }\n- }\n-\n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n-\n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n-\n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n+ System.out.println(gone);\n }\n }\n }", "output": "SLOWER 0.545", "pair_id": "java_5795_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.459} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- long sum = i + j;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n if (sum % 2 == 0) {\n- long gone = 0;\n+ System.out.println(no);\n+ } else {\n \n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n+ System.out.println(m + no);\n }\n }\n }", "output": "FASTER 0.029", "pair_id": "java_5813_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0203} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n-\n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n- }\n-\n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 0.8294", "pair_id": "java_4723_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.777} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class ProblemD {\n-\n+public class MyClass {\n public static void main(String[] args) {\n-\n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n+ }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.0363", "pair_id": "java_196_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class triangulation {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- out.println(sum);\n- out.close();\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.0262", "pair_id": "java_201_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0183} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n+public class Main {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n \n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n- } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n+ int n = in.nextInt(), q = in.nextInt();\n+\n+ RUpdateQ rUpdateQ = new RUpdateQ(n);\n+\n+ for (int i = 0; i < q; i++) {\n+ int cmd = in.nextInt();\n+ if (cmd == 0) {\n+ int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n+ rUpdateQ.update(s, t, x);\n+ }\n+ if (cmd == 1) {\n+ int index = in.nextInt();\n+ System.out.println(rUpdateQ.find(index));\n }\n }\n }\n+}\n \n- static int nint() {\n- return Integer.parseInt(sc.next());\n+class RUpdateQ {\n+ int[] heap;\n+ int n;\n+\n+ static int _heap_size(int n) {\n+ int pow2 = 1;\n+ while (pow2 < n) {\n+ pow2 *= 2;\n+ }\n+ return pow2 * 2;\n+ }\n+\n+ RUpdateQ(int n) {\n+ this.n = n;\n+ heap = new int[_heap_size(n)];\n+ Arrays.fill(heap, Integer.MAX_VALUE);\n+ }\n+\n+ public void update(int s, int t, int x) {\n+ update(s, t + 1, x, 0, n, 1);\n+ }\n+\n+ private void update(int s, int t, int x, int l, int r, int ih) {\n+ if (s >= t) {\n+ return;\n+ }\n+ if (s == l && t == r) {\n+ heap[ih] = x;\n+ return;\n+ }\n+\n+ if (heap[ih] >= 0) {\n+\n+ heap[ih * 2] = heap[ih];\n+ heap[ih * 2 + 1] = heap[ih];\n+\n+ heap[ih] = -1;\n+ }\n+\n+ int mid = (l + r) / 2;\n+ update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n+ update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n+ }\n+\n+ public int find(int index) {\n+ return find(index, 0, n, 1);\n+ }\n+\n+ private int find(int index, int l, int r, int ih) {\n+ if (heap[ih] >= 0) {\n+ return heap[ih];\n+ } else {\n+ int mid = (l + r) / 2;\n+ if (index < mid) {\n+ return find(index, l, mid, ih * 2);\n+ } else {\n+ return find(index, mid, r, ih * 2 + 1);\n+ }\n+ }\n }\n }", "output": "FASTER 0.0992", "pair_id": "java_5744_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.0712} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.Arrays;\n+import java.util.NoSuchElementException;\n \n public class Main {\n+ public static class SegmentTree {\n+ int[] tree;\n \n- private static Scanner sc;\n- private static Printer pr;\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n \n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n \n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ }\n+ }\n \n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n \n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n+ public int query(int a, int b, int k, int l, int r) {\n \n- pr.println(ruq.find(index));\n- pr.flush();\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n+\n+ } else {\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n }\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n \n- static final int NULL = -1;\n-\n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n \n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n }\n \n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n- } else {\n- return data[index];\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n }\n-\n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n-\n- solve();\n-\n- pr.close();\n- sc.close();\n- }\n-\n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n-\n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n- }\n- }\n }", "output": "FASTER 0.2787", "pair_id": "java_5722_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.2131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.HashMap;\n+import java.util.Random;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int num = Integer.parseInt(sc.next());\n- String str = sc.next();\n+ int N = scanner.nextInt();\n+ char[] s = scanner.next().toCharArray();\n+ int[] M = {999_999_937, 1_000_000_007};\n+ int B = new Random().nextInt(999_999_937);\n+ int left = 0;\n+ int right = N / 2 + 1;\n+ while (right - left > 1) {\n+ int mid = (left + right) / 2;\n+ if (possible(s, mid, N, B, M)) left = mid;\n+ else right = mid;\n+ }\n+ System.out.println(left);\n+ }\n \n- int res = 0;\n- for (int len = num; len > 0; len--) {\n- int[] dp = new int[num];\n- for (int i = num - len - 1; i >= 0; i--) {\n- if (str.charAt(i) == str.charAt(i + len)) {\n- dp[i] = Math.min(dp[i + 1] + 1, len);\n- res = Math.max(res, dp[i]);\n- } else {\n- dp[i] = 0;\n- }\n+ private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n+ long[] bn = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ bn[i] = 1;\n+ for (int j = 0; j < K - 1; j++) {\n+ bn[i] *= B;\n+ bn[i] %= M[i];\n }\n }\n \n- System.out.println(res);\n+ HashMap occurrences = new HashMap<>();\n+ long[] hash = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ hash[i] = hash(s, K, B, M[i]);\n+ }\n+ occurrences.put(new Tuple(hash), 0);\n+ for (int i = 1; i <= N - K; i++) {\n+ for (int j = 0; j < M.length; j++) {\n+ hash[j] -= s[i - 1] * bn[j] % M[j];\n+ if (hash[j] < 0) hash[j] += M[j];\n+ hash[j] *= B;\n+ hash[j] %= M[j];\n+ hash[j] += s[i + K - 1];\n+ if (hash[j] >= M[j]) hash[j] -= M[j];\n+ }\n+ Tuple key = new Tuple(hash);\n+ if (occurrences.containsKey(key)) {\n+ if (occurrences.get(key) + K <= i) return true;\n+ } else occurrences.put(key, i);\n+ }\n+ return false;\n+ }\n+\n+ private static long hash(char[] s, int len, int B, int M) {\n+ if (s.length < len)\n+ throw new IllegalArgumentException(\n+ \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n+ long hash = 0;\n+ for (int i = 0; i < len; i++) {\n+ hash *= B;\n+ hash %= M;\n+ hash += s[i];\n+ if (hash >= M) hash -= M;\n+ }\n+ return hash;\n+ }\n+\n+ private static class Tuple {\n+ private final long[] elements;\n+\n+ private Tuple(long[] elements) {\n+ this.elements = Arrays.copyOf(elements, elements.length);\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Tuple tuple = (Tuple) o;\n+ return Arrays.equals(elements, tuple.elements);\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return Arrays.hashCode(elements);\n+ }\n }\n }", "output": "SLOWER 0.0894", "pair_id": "java_3832_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.0639} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n-\n- System.out.println((X - A) % B);\n+ int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n+ x -= a;\n+ while (b <= x) {\n+ x -= b;\n+ }\n+ System.out.println(x);\n }\n }", "output": "SLOWER 0.0703", "pair_id": "java_6632_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0499} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class B {\n+public class Main {\n \n- private static long N;\n- private static long LAST;\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n \n- LAST = N * N / 2 + (N & 1);\n+ long diff = ((N * N) + 1) / 2;\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n }\n }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n- }\n }", "output": "FASTER 0.7702", "pair_id": "java_5821_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.7055} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Test {\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 0.0315", "pair_id": "java_4759_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.0221} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Test {\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n+\n+ public void close() throws IOException {\n+ bw.close();\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n+ }\n \n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n }\n }\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n \n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n }\n }\n }\n \n- public static class duel {\n- public int x;\n- public int freq;\n+ public static class line {\n+ double x;\n+ double y;\n \n- public duel(int x, int y) {\n+ line(point a, point b, double x) {\n this.x = x;\n- this.freq = y;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n \n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n- System.out.println(st.size());\n }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 4.6015", "pair_id": "java_4718_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 24.2759} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class B {\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ static long N;\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n \n- long ans = 0, end = 0;\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n \n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n }\n+ return (char) buf[bId++];\n+ }\n \n- q--;\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n }\n }\n }", "output": "SLOWER 0.057", "pair_id": "java_5783_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0403} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- }\n-\n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n+ }\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 1.3197", "pair_id": "java_4766_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.4962} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- String S = sc.next();\n+ int n = sc.nextInt();\n+ String s = sc.next();\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ for (int j = i + max + 1; j < n; j++) {\n+ if (0 < s.indexOf(s.substring(i, j), j)) {\n+ max = j - i;\n+ } else {\n+ break;\n+ }\n+ }\n+ }\n+ System.out.println(max);\n sc.close();\n- int r = -1;\n- String s = \"\";\n- long ans = 0;\n- for (int l = 0; l < N; l++) {\n- while (l - 1 > r) {\n- r++;\n- }\n- while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n- s += S.charAt(r + 1);\n- r++;\n- }\n- ans = Math.max(r - l + 1, ans);\n- if (s.length() >= 2) s = s.substring(1);\n- else if (s.length() == 1) s = \"\";\n- }\n- System.out.println(ans);\n }\n }", "output": "FASTER 0.5377", "pair_id": "java_3827_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.4517} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n+ }\n \n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n-\n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n }", "output": "SLOWER 0.6257", "pair_id": "java_5754_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.543} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class JavaApplication42 {\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n \n public static void main(String[] args) {\n+ int n = in.nextInt();\n \n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- System.out.println(sum);\n+\n+ out.println(weight);\n+\n+ in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.031", "pair_id": "java_208_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0217} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Demo {\n+public class R181D2A {\n \n- public static void main(String[] args) {\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n+ }\n+}\n \n- int n, n1, n2, n3;\n- Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n- int[] arr = new int[n];\n+class gao {\n \n- for (int i = 0; i < arr.length; i++) {\n- arr[i] = sc.nextInt();\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n \n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n- }\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n- }\n-\n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n-\n- for (int i = 0; i < arr.length; i++) {\n-\n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n- }\n- }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n- }\n-\n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n }", "output": "FASTER 0.0362", "pair_id": "java_6828_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0254} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static long mod = 1000000007;\n-\n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n } else {\n- c[i][0] = x;\n- c[i][1] = y;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n- }\n-\n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n-\n- return r;\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 5.0461", "pair_id": "java_4708_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 33.0399} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n+ }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n-\n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n- }\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 5.331", "pair_id": "java_4699_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 40.252} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n \n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n \n- gone = gone + j / 2;\n- } else {\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n \n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n- }\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "FASTER 0.0407", "pair_id": "java_5808_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0286} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.PrintWriter;\n import java.util.*;\n \n-public class second {\n+public class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+ for (int k = 0; k < q; k++) {\n+\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n+\n pw.flush();\n }\n }", "output": "FASTER 0.2286", "pair_id": "java_5825_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1717} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class Main {\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ long diff = ((N * N) + 1) / 2;\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n }\n }\n }", "output": "SLOWER 0.6021", "pair_id": "java_5787_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5179} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n-\n- pw.println(\"NO\");\n- pw.close();\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "FASTER 2.6046", "pair_id": "java_4749_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 6.0823} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class C {\n+ static class Point {\n+ int x, y;\n+\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n+\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n+ }\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n+\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "FASTER 0.9952", "pair_id": "java_4754_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.9933} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n+import java.io.PrintWriter;\n import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n-\n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n- }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n }\n }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n \n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n+\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n+\n+class IntDualSegmentTree {\n+\n+ final int[] Dat;\n+\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n+ }\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n+ }\n \n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ }\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n }\n }\n+ propagate(k);\n+ return Dat[k - N];\n+ }\n \n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n+ }\n+\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n+ } else {\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n- System.out.println();\n+ Laz[k] = E1;\n }\n }\n \n public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n-\n- } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n- }\n- }\n- }\n-\n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "SLOWER 1.2175", "pair_id": "java_5724_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.3255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n+ }\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt(), q = in.nextInt();\n-\n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n-\n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n- }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n- }\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n }\n }\n }\n-\n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n- }\n- return pow2 * 2;\n- }\n-\n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n-\n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n-\n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n- }\n-}", "output": "FASTER 1.3003", "pair_id": "java_5731_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.4628} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class ArrayA_300A {\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n+ for (int i = 0; i < n; i++) {\n \n- public static void main(String[] args) {\n+ x[i] = Integer.parseInt(st.nextToken());\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int arr[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = sc.nextInt();\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n+\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n }\n System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n+ }\n+ }\n } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n+ break;\n+ }\n+ }\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }", "output": "FASTER 1.8636", "pair_id": "java_6817_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.6392} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.HashMap;\n-import java.util.Random;\n+import java.util.HashSet;\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ String s = in.next();\n \n- int N = scanner.nextInt();\n- char[] s = scanner.next().toCharArray();\n- int[] M = {999_999_937, 1_000_000_007};\n- int B = new Random().nextInt(999_999_937);\n- int left = 0;\n- int right = N / 2 + 1;\n- while (right - left > 1) {\n- int mid = (left + right) / 2;\n- if (possible(s, mid, N, B, M)) left = mid;\n- else right = mid;\n- }\n- System.out.println(left);\n- }\n+ HashSet set = new HashSet<>();\n \n- private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n- long[] bn = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- bn[i] = 1;\n- for (int j = 0; j < K - 1; j++) {\n- bn[i] *= B;\n- bn[i] %= M[i];\n+ int len = 1;\n+ int lenMax = 0;\n+ for (int st = 0; st + len - 1 < n; st++) {\n+ String temp = s.substring(st, st + len);\n+\n+ while (s.indexOf(temp, st + len) > st) {\n+ len++;\n+ temp = s.substring(st, st + len);\n }\n+ lenMax = Math.max(lenMax, len - 1);\n }\n \n- HashMap occurrences = new HashMap<>();\n- long[] hash = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- hash[i] = hash(s, K, B, M[i]);\n- }\n- occurrences.put(new Tuple(hash), 0);\n- for (int i = 1; i <= N - K; i++) {\n- for (int j = 0; j < M.length; j++) {\n- hash[j] -= s[i - 1] * bn[j] % M[j];\n- if (hash[j] < 0) hash[j] += M[j];\n- hash[j] *= B;\n- hash[j] %= M[j];\n- hash[j] += s[i + K - 1];\n- if (hash[j] >= M[j]) hash[j] -= M[j];\n- }\n- Tuple key = new Tuple(hash);\n- if (occurrences.containsKey(key)) {\n- if (occurrences.get(key) + K <= i) return true;\n- } else occurrences.put(key, i);\n- }\n- return false;\n- }\n-\n- private static long hash(char[] s, int len, int B, int M) {\n- if (s.length < len)\n- throw new IllegalArgumentException(\n- \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n- long hash = 0;\n- for (int i = 0; i < len; i++) {\n- hash *= B;\n- hash %= M;\n- hash += s[i];\n- if (hash >= M) hash -= M;\n- }\n- return hash;\n- }\n-\n- private static class Tuple {\n- private final long[] elements;\n-\n- private Tuple(long[] elements) {\n- this.elements = Arrays.copyOf(elements, elements.length);\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Tuple tuple = (Tuple) o;\n- return Arrays.equals(elements, tuple.elements);\n- }\n-\n- @Override\n- public int hashCode() {\n- return Arrays.hashCode(elements);\n- }\n+ System.out.println(lenMax);\n+ in.close();\n }\n }", "output": "FASTER 0.1916", "pair_id": "java_3829_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.142} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n+public class EducationalRound49B {\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ public static void main(String[] args) {\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n+ public static PrintWriter out;\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- gone = gone + j / 2;\n- } else {\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- gone = gone + ((i - 1) / 2 * N);\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n \n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n }\n+ return str;\n }\n }\n }", "output": "FASTER 0.6834", "pair_id": "java_5778_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.6059} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+ }\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 4.6233", "pair_id": "java_4719_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 24.6462} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- static long N;\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n+ }\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n- }\n- }\n- }\n-\n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n-\n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n-\n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "SLOWER 0.466", "pair_id": "java_5792_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.3813} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- solve3027();\n- }\n-\n- public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n-\n- int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n-\n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n- System.out.println(ans);\n-\n- sc.close();\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n+ }\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "FASTER 0.0007", "pair_id": "java_7309_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 1.0005} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class ArrayA_300A {\n-\n+public class Array {\n public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int arr[] = new int[n];\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n+ int[] arr = new int[n];\n+ int plus = 0;\n for (int i = 0; i < n; i++) {\n- arr[i] = sc.nextInt();\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n+ }\n }\n- System.out.println();\n } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n+ }\n }\n }\n+ print(neg);\n+ print(pos);\n+ print(z);\n+ }\n+\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.println();\n+ return;\n }\n }", "output": "FASTER 0.1194", "pair_id": "java_6826_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0863} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n }\n- return st.nextToken();\n }\n \n- int nextInt() {\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n }\n }", "output": "SLOWER 5.2888", "pair_id": "java_4721_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 39.0914} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class TaskC {\n+public class Test {\n \n- public static void main(String[] args) {\n+ public static void main(String[] args) throws Exception {\n+ int[] nums0 = {1, 2, 2, 1, 0, 0};\n+ int[] nums1 = {0, 0, 1, 2, 2, 1};\n+\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n- int[] arr = {0, 0, 0};\n- int x = sc.nextInt();\n- arr[x] = 1;\n- int i = 0;\n- for (i = n; i > 0 && arr[1] != 1; i--) {\n- if (i % 2 == 0) {\n- int t = arr[1];\n- arr[1] = arr[2];\n- arr[2] = t;\n+ int current = sc.nextInt();\n+ int rem = n - (n / 6) * 6;\n+ if (rem == 0) {\n+ System.out.println(current);\n+ } else {\n+ if (nums0[rem - 1] == current) {\n+ System.out.println(\"0\");\n+ } else if (nums1[rem - 1] == current) {\n+ System.out.println(\"1\");\n } else {\n- int t = arr[0];\n- arr[0] = arr[1];\n- arr[1] = t;\n+ System.out.println(\"2\");\n }\n }\n- if (i == 0) {\n- for (int j = 0; j < 3; j++) {\n- if (arr[j] == 1) {\n- System.out.println(j);\n- break;\n- }\n- }\n- } else {\n- if (i % 2 == 0) {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(2);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(0);\n- }\n- } else {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(0);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(2);\n- }\n- }\n- }\n-\n- sc.close();\n }\n }", "output": "SLOWER 0.073", "pair_id": "java_424_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0519} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n-\n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n-\n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n- }\n-\n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.518", "pair_id": "java_5805_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.432} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 3.3847", "pair_id": "java_4743_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 10.4445} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.*;\n+import java.util.StringTokenizer;\n \n public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- System.out.println(solve(x, y, n));\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n+ }\n+\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n-\n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n- }\n }", "output": "FASTER 0.1635", "pair_id": "java_5803_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.12} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class JavaApplication42 {\n-\n- public static void main(String[] args) {\n-\n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- System.out.println(sum);\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.002", "pair_id": "java_199_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0014} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n-\n- public static void main(String[] args) {\n- int n = in.nextInt();\n-\n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ System.out.println(p);\n }\n }", "output": "FASTER 0.0329", "pair_id": "java_203_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0231} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class EducationalRound49B {\n-\n+public class second {\n public static void main(String[] args) {\n-\n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n- out.close();\n- }\n-\n- public static PrintWriter out;\n-\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 1.1223", "pair_id": "java_5781_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.1769} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n- public static void main(String[] args) {\n+public class Main {\n+ public static void main(String[] argc) {\n+ Scanner sc = new Scanner(System.in);\n+ int x = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n \n- Scanner sc = new Scanner(System.in);\n-\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n-\n- System.out.println((X - A) % B);\n+ System.out.println((x - a) % b);\n }\n }", "output": "SLOWER 0.1274", "pair_id": "java_6634_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0923} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n \n-public class Array {\n+public class CF300A {\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n- int n = s.nextInt();\n- int[] arr = new int[n];\n- int plus = 0;\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n+ int n = sc.nextInt();\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n+\n for (int i = 0; i < n; i++) {\n- arr[i] = s.nextInt();\n- if (arr[i] > 0) plus++;\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n }\n- List neg = new ArrayList<>();\n- List pos = new ArrayList<>();\n- List z = new ArrayList<>();\n- if (plus > 0) {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else z.add(x);\n- } else {\n- if (pos.size() == 0) pos.add(x);\n- else z.add(x);\n- }\n- }\n- } else {\n- for (int i = 0; i < n; i++) {\n- int x = arr[i];\n- if (x == 0) z.add(x);\n- else if (x < 0) {\n- if (neg.size() == 0) neg.add(x);\n- else if (pos.size() < 2) pos.add(x);\n- else z.add(x);\n+\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n+ break;\n }\n }\n }\n- print(neg);\n- print(pos);\n- print(z);\n- }\n \n- private static void print(List arr) {\n- System.out.print(arr.size() + \" \");\n- for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n- System.out.println();\n- return;\n+ int[] num = new int[n];\n+\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n+ }\n+ }\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n+\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n+ }\n+ pr.flush();\n }\n }", "output": "FASTER 0.0082", "pair_id": "java_6818_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0057} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n public class B {\n \n- private static long N;\n- private static long LAST;\n+ static long N;\n \n public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- LAST = N * N / 2 + (N & 1);\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n \n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n \n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n }\n }\n \n- private static long number(long i, long j) {\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n \n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n+ }\n }\n }", "output": "FASTER 1.3152", "pair_id": "java_5799_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 2.4884} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class ProblemD {\n-\n+public class Main {\n public static void main(String[] args) {\n-\n Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n+ }\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.0742", "pair_id": "java_184_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0528} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.util.HashMap;\n+import java.util.Map;\n+import java.util.Scanner;\n \n-public class Main {\n- static class Stone implements Comparable {\n- int a, b, c, position;\n+public class Skulptor2 {\n \n- Stone(int a, int b, int c, int d) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- this.position = d;\n+ public static void main(String[] args) {\n+ Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n+ int n = scan.nextInt();\n+\n+ L2Map map = new L2Map();\n+ Parallelepiped[] data = new Parallelepiped[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n+ Parallelepiped p = new Parallelepiped(i, a, b, c);\n+ data[i] = p;\n+ map.put(p);\n }\n \n- Stone() {}\n+ int maxDiameter = -1;\n+ int first = -1, second = -1;\n \n- @Override\n- public int compareTo(Stone s) {\n- if (this.c < s.c) return -1;\n- else if (this.c > s.c) return 1;\n- else if (this.b < s.b) return -1;\n- else if (this.b > s.b) return 1;\n- else if (this.a < s.a) return -1;\n- else if (this.a > s.a) return 1;\n- else return 0;\n+ for (Parallelepiped p : data) {\n+ if (p.c > maxDiameter) {\n+ maxDiameter = p.c;\n+ first = p.index;\n+ second = -1;\n+ }\n+\n+ Parallelepiped p2 = map.get(p);\n+ if (p2 != null) {\n+ int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n+ if (d > maxDiameter) {\n+ first = p.index;\n+ second = p2.index;\n+ maxDiameter = d;\n+ }\n+ }\n+ }\n+\n+ if (second == -1) {\n+ System.out.println(1);\n+ System.out.println(first + 1);\n+ } else {\n+ System.out.println(2);\n+ System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- while (sc.hasNext()) {\n- int n = sc.nextInt();\n- int max = -1;\n- int index = 0;\n- Stone[] s = new Stone[n];\n- int flag = 0;\n- int jg1 = 0;\n- int jg2 = 0;\n- int shu[] = new int[3];\n- for (int i = 0; i < n; i++) {\n- shu[0] = sc.nextInt();\n- shu[1] = sc.nextInt();\n- shu[2] = sc.nextInt();\n- Arrays.sort(shu);\n- s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n- if (max < shu[0]) {\n- index = i + 1;\n- max = shu[0];\n- }\n+ static class Parallelepiped {\n+ final int index;\n+ final int a, b, c;\n+\n+ Parallelepiped(int index, int a, int b, int c) {\n+\n+ this.index = index;\n+\n+ int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n+ int m4 = Math.max(m1, m2),\n+ m5 = Math.min(Math.min(m1, m2), m3),\n+ m6 = Math.min(Math.min(a, b), c);\n+\n+ this.a = m4;\n+ this.b = m5;\n+ this.c = m6;\n+ }\n+ }\n+\n+ static class L2Map {\n+ private Map> map =\n+ new HashMap>();\n+\n+ void put(Parallelepiped v) {\n+\n+ Map map2 = map.get(v.a);\n+ if (map2 == null) {\n+ map2 = new HashMap();\n+ map.put(v.a, map2);\n }\n- Arrays.sort(s);\n- for (int i = 0; i < n - 1; i++) {\n- if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n- int[] bj = new int[3];\n- bj[0] = s[i].a + s[i + 1].a;\n- bj[1] = s[i].b;\n- bj[2] = s[i].c;\n- Arrays.sort(bj);\n- if (bj[0] > max) {\n- flag = 1;\n- max = bj[0];\n- jg1 = s[i].position;\n- jg2 = s[i + 1].position;\n- }\n- }\n+\n+ Parallelepiped[] currentVs = map2.get(v.b);\n+ if (currentVs == null) {\n+ currentVs = new Parallelepiped[2];\n+ currentVs[0] = v;\n+ map2.put(v.b, currentVs);\n+ } else {\n+ if (currentVs[0].c < v.c) {\n+ currentVs[1] = currentVs[0];\n+ currentVs[0] = v;\n+ } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n- if (flag == 1) {\n- System.out.println(2);\n- System.out.println(jg1 + \" \" + jg2);\n- } else {\n- System.out.println(1);\n- System.out.println(index);\n- }\n+ }\n+\n+ Parallelepiped get(Parallelepiped p) {\n+ Map map2 = map.get(p.a);\n+ if (map2 == null) return null;\n+ Parallelepiped[] values = map2.get(p.b);\n+ if (values == null) return null;\n+ if (values[0] == p) return values[1];\n+ else return values[0];\n }\n }\n }", "output": "SLOWER 0.9094", "pair_id": "java_9713_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.8783} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n- for (int i = 0; i < n; i++) {\n+public class Demo {\n \n- x[i] = Integer.parseInt(st.nextToken());\n+ public static void main(String[] args) {\n \n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n+ int n, n1, n2, n3;\n+ Scanner sc = new Scanner(System.in);\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n+ int[] arr = new int[n];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+ arr[i] = sc.nextInt();\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n+ }\n+ }\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n }\n \n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n- }\n- }\n- } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n- break;\n- }\n- }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n }\n }\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n+ }\n+\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n+ }\n+ System.out.println(\"\");\n }\n }", "output": "SLOWER 1.8049", "pair_id": "java_6816_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.4941} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- static class sort implements Comparable {\n- int a, b, c;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n+ System.out.println(solve(x, y, n));\n }\n }\n \n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n \n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.7894", "pair_id": "java_5758_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7283} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n+public class CF300A {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n+ int n = sc.nextInt();\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n+\n for (int i = 0; i < n; i++) {\n-\n- x[i] = Integer.parseInt(st.nextToken());\n-\n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n }\n \n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n- }\n- }\n- } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n break;\n }\n }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ }\n+\n+ int[] num = new int[n];\n+\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n }\n }\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n+\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n+ }\n+ pr.flush();\n }\n }", "output": "SLOWER 1.736", "pair_id": "java_6812_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.3311} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n import java.util.Scanner;\n \n public class Main {\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n \n- int n = in.nextInt(), q = in.nextInt();\n+ Scanner sc = new Scanner(System.in);\n \n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n \n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n+ init(n1);\n+ arr = new int[op_num];\n+\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n+ } else {\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n- }\n+ i1++;\n+ mark++;\n+ }\n+ }\n+\n+ private static int find(int n1, int n2) {\n+\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n+ }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n+ }\n+\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n+ }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ }\n+\n+ public static void init(int N) {\n+\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n }\n-\n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n- }\n- return pow2 * 2;\n- }\n-\n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n-\n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n-\n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n- }\n-}", "output": "SLOWER 0.1054", "pair_id": "java_5745_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.0758} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n+ public static void main(String[] args) {\n \n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n+ Scanner sc = new Scanner(System.in);\n \n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n \n- public static class Solver {\n- public Solver() {\n+ init(n1);\n+ arr = new int[op_num];\n \n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n- } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n+ } else {\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n- }\n-\n- public static class SegmentTree {\n-\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n-\n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n- }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n- }\n+ i1++;\n+ mark++;\n }\n }\n \n- public static void main(String[] args) {\n- new Solver();\n+ private static int find(int n1, int n2) {\n+\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n+ }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n+\n+ return temp;\n }\n \n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n \n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n+ }\n \n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n+ public static void init(int N) {\n \n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n }", "output": "SLOWER 1.2028", "pair_id": "java_5738_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.3019} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n }\n- }\n-\n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.2162", "pair_id": "java_191_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.1617} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- }\n-\n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n \n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 3.9341", "pair_id": "java_4752_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 15.2856} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class CF300A {\n+public class Array {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n- int zeros = 0;\n- int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n-\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n+ int[] arr = new int[n];\n+ int plus = 0;\n for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n+ }\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n+ }\n }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n- }\n-\n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n- break;\n+ } else {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n }\n }\n }\n+ print(neg);\n+ print(pos);\n+ print(z);\n+ }\n \n- int[] num = new int[n];\n-\n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n- }\n- }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.println();\n+ return;\n }\n }", "output": "SLOWER 0.0082", "pair_id": "java_6818_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0057} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class TwoSquares {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ Scanner s = new Scanner(System.in);\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n \n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 0.664", "pair_id": "java_4767_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.5845} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-public class Test {\n-\n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n-\n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n- }\n- }\n-\n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n- }\n-\n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 4.4544", "pair_id": "java_4727_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 21.9231} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- System.out.println(sum);\n+\n+ out.println(weight);\n+\n+ in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.1158", "pair_id": "java_190_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0836} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n \n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 2.3247", "pair_id": "java_4757_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 5.0095} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class ShellGame {\n- public static void main(String[] args) {\n- Scanner nw = new Scanner(System.in);\n- int n = nw.nextInt();\n- int pos = nw.nextInt();\n- String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n- (n) %= elm.length;\n- System.out.println(elm[n].charAt(pos));\n+public class Codechef {\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner sc = new Scanner(System.in);\n+ int noOfMoves = sc.nextInt();\n+ int index = sc.nextInt();\n+\n+ int position = index;\n+\n+ for (int i = noOfMoves % 6; i >= 1; i--) {\n+ if (i % 2 == 0) {\n+ if (position == 2) position = 1;\n+ else if (position == 1) position = 2;\n+ } else {\n+ if (position == 1) position = 0;\n+ else if (position == 0) position = 1;\n+ }\n+ }\n+\n+ System.out.println(position);\n }\n }", "output": "FASTER 0.1472", "pair_id": "java_422_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.1074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class EducationalRound49B {\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ public static void main(String[] args) {\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n+ return str;\n }\n }\n }", "output": "FASTER 0.0812", "pair_id": "java_5773_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0579} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- String s = in.next();\n-\n- HashSet set = new HashSet<>();\n-\n- int len = 1;\n- int lenMax = 0;\n- for (int st = 0; st + len - 1 < n; st++) {\n- String temp = s.substring(st, st + len);\n-\n- while (s.indexOf(temp, st + len) > st) {\n- len++;\n- temp = s.substring(st, st + len);\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ String S = sc.next();\n+ sc.close();\n+ int r = -1;\n+ String s = \"\";\n+ long ans = 0;\n+ for (int l = 0; l < N; l++) {\n+ while (l - 1 > r) {\n+ r++;\n }\n- lenMax = Math.max(lenMax, len - 1);\n+ while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n+ s += S.charAt(r + 1);\n+ r++;\n+ }\n+ ans = Math.max(r - l + 1, ans);\n+ if (s.length() >= 2) s = s.substring(1);\n+ else if (s.length() == 1) s = \"\";\n }\n-\n- System.out.println(lenMax);\n- in.close();\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.4948", "pair_id": "java_3831_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.4091} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n+import java.io.Closeable;\n import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n import java.io.OutputStreamWriter;\n-\n-public class newProgram5 {\n-\n- public static void main(String[] args) throws IOException {\n-\n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n- }\n- }\n-\n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n-\n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n-\n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n+ for (int i = 0; i < 4; i++) {\n+ r1.update(in.readInt(), in.readInt());\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n+ } else {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n }\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 1.8716", "pair_id": "java_4725_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.6594} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\nimport java.nio.charset.Charset;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n LightScanner in = new LightScanner(inputStream);\n LightWriter out = new LightWriter(outputStream);\n E1Or2 solver = new E1Or2();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class E1Or2 {\n public void solve(int testNumber, LightScanner in, LightWriter out) {\n\n int n = in.ints(), m = in.ints();\n IntUnionFind uf = new IntUnionFind(n);\n for (int i = 0; i < m; i++) {\n int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n uf.union(x, y);\n }\n out.ans(uf.size()).ln();\n }\n }\n\n static class LightScanner {\n private BufferedReader reader = null;\n private StringTokenizer tokenizer = null;\n\n public LightScanner(InputStream in) {\n reader = new BufferedReader(new InputStreamReader(in));\n }\n\n public String string() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int ints() {\n return Integer.parseInt(string());\n }\n }\n\n static final class IntUnionFind {\n private int groups;\n private final int[] nodes;\n private final int[] rank;\n\n public IntUnionFind(int n) {\n groups = n;\n nodes = new int[n];\n Arrays.fill(nodes, -1);\n rank = new int[n];\n }\n\n public int find(int i) {\n int ans = nodes[i];\n if (ans < 0) {\n return i;\n } else {\n return nodes[i] = find(ans);\n }\n }\n\n public int size() {\n return groups;\n }\n\n public boolean union(int x, int y) {\n x = find(x);\n y = find(y);\n if (x == y) {\n return false;\n } else if (rank[x] < rank[y]) {\n nodes[y] += nodes[x];\n nodes[x] = y;\n } else if (rank[x] == rank[y]) {\n rank[x]++;\n nodes[x] += nodes[y];\n nodes[y] = x;\n } else {\n nodes[x] += nodes[y];\n nodes[y] = x;\n }\n groups--;\n return true;\n }\n }\n\n static class LightWriter implements AutoCloseable {\n private final Writer out;\n private boolean autoflush = false;\n private boolean breaked = true;\n\n public LightWriter(Writer out) {\n this.out = out;\n }\n\n public LightWriter(OutputStream out) {\n this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n }\n\n public LightWriter print(char c) {\n try {\n out.write(c);\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter print(String s) {\n try {\n out.write(s, 0, s.length());\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter ans(String s) {\n if (!breaked) {\n print(' ');\n }\n return print(s);\n }\n\n public LightWriter ans(int i) {\n return ans(Integer.toString(i));\n }\n\n public LightWriter ln() {\n print(System.lineSeparator());\n breaked = true;\n if (autoflush) {\n try {\n out.flush();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n return this;\n }\n\n public void close() {\n try {\n out.close();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n UnionFindTree t = new UnionFindTree(n);\n\n for (int i = 0; i < m; i++) {\n t.unite(sc.nextInt() - 1, sc.nextInt() - 1);\n sc.nextInt();\n }\n\n System.out.println(t.total());\n }\n}\n\nclass UnionFindTree {\n int[] par;\n int[] rank;\n int[] peers;\n\n public UnionFindTree(int n) {\n par = new int[n];\n rank = new int[n];\n peers = new int[n];\n\n for (int i = 0; i < n; i++) {\n par[i] = i;\n peers[i] = 1;\n }\n }\n\n int find(int x) {\n if (par[x] == x) {\n return x;\n } else {\n return par[x] = find(par[x]);\n }\n }\n\n void unite(int x, int y) {\n int px = find(x);\n int py = find(y);\n\n if (px == py) {\n return;\n } else if (rank[px] < rank[py]) {\n peers[py] += peers[px];\n par[px] = py;\n\n } else {\n peers[px] += peers[py];\n par[py] = px;\n if (rank[px] == rank[py]) {\n rank[px]++;\n }\n }\n }\n\n boolean isEquivalent(int x, int y) {\n return find(x) == find(y);\n }\n\n int peersnum(int x) {\n return peers[find(x)];\n }\n\n int total() {\n boolean[] iss = new boolean[par.length];\n int sum = 0;\n for (int i = 0; i < par.length; i++) {\n int mo = find(i);\n if (iss[mo]) {\n\n } else {\n iss[mo] = true;\n sum += 1;\n }\n }\n return sum;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n-import java.nio.charset.Charset;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- LightScanner in = new LightScanner(inputStream);\n- LightWriter out = new LightWriter(outputStream);\n- E1Or2 solver = new E1Or2();\n- solver.solve(1, in, out);\n- out.close();\n+ FastScanner sc = new FastScanner();\n+\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ UnionFindTree t = new UnionFindTree(n);\n+\n+ for (int i = 0; i < m; i++) {\n+ t.unite(sc.nextInt() - 1, sc.nextInt() - 1);\n+ sc.nextInt();\n+ }\n+\n+ System.out.println(t.total());\n }\n+}\n \n- static class E1Or2 {\n- public void solve(int testNumber, LightScanner in, LightWriter out) {\n+class UnionFindTree {\n+ int[] par;\n+ int[] rank;\n+ int[] peers;\n \n- int n = in.ints(), m = in.ints();\n- IntUnionFind uf = new IntUnionFind(n);\n- for (int i = 0; i < m; i++) {\n- int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n- uf.union(x, y);\n- }\n- out.ans(uf.size()).ln();\n+ public UnionFindTree(int n) {\n+ par = new int[n];\n+ rank = new int[n];\n+ peers = new int[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ peers[i] = 1;\n }\n }\n \n- static class LightScanner {\n- private BufferedReader reader = null;\n- private StringTokenizer tokenizer = null;\n-\n- public LightScanner(InputStream in) {\n- reader = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- public String string() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int ints() {\n- return Integer.parseInt(string());\n+ int find(int x) {\n+ if (par[x] == x) {\n+ return x;\n+ } else {\n+ return par[x] = find(par[x]);\n }\n }\n \n- static final class IntUnionFind {\n- private int groups;\n- private final int[] nodes;\n- private final int[] rank;\n+ void unite(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n \n- public IntUnionFind(int n) {\n- groups = n;\n- nodes = new int[n];\n- Arrays.fill(nodes, -1);\n- rank = new int[n];\n- }\n+ if (px == py) {\n+ return;\n+ } else if (rank[px] < rank[py]) {\n+ peers[py] += peers[px];\n+ par[px] = py;\n \n- public int find(int i) {\n- int ans = nodes[i];\n- if (ans < 0) {\n- return i;\n- } else {\n- return nodes[i] = find(ans);\n+ } else {\n+ peers[px] += peers[py];\n+ par[py] = px;\n+ if (rank[px] == rank[py]) {\n+ rank[px]++;\n }\n- }\n-\n- public int size() {\n- return groups;\n- }\n-\n- public boolean union(int x, int y) {\n- x = find(x);\n- y = find(y);\n- if (x == y) {\n- return false;\n- } else if (rank[x] < rank[y]) {\n- nodes[y] += nodes[x];\n- nodes[x] = y;\n- } else if (rank[x] == rank[y]) {\n- rank[x]++;\n- nodes[x] += nodes[y];\n- nodes[y] = x;\n- } else {\n- nodes[x] += nodes[y];\n- nodes[y] = x;\n- }\n- groups--;\n- return true;\n }\n }\n \n- static class LightWriter implements AutoCloseable {\n- private final Writer out;\n- private boolean autoflush = false;\n- private boolean breaked = true;\n+ boolean isEquivalent(int x, int y) {\n+ return find(x) == find(y);\n+ }\n \n- public LightWriter(Writer out) {\n- this.out = out;\n- }\n+ int peersnum(int x) {\n+ return peers[find(x)];\n+ }\n \n- public LightWriter(OutputStream out) {\n- this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n- }\n+ int total() {\n+ boolean[] iss = new boolean[par.length];\n+ int sum = 0;\n+ for (int i = 0; i < par.length; i++) {\n+ int mo = find(i);\n+ if (iss[mo]) {\n \n- public LightWriter print(char c) {\n- try {\n- out.write(c);\n- breaked = false;\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- return this;\n- }\n-\n- public LightWriter print(String s) {\n- try {\n- out.write(s, 0, s.length());\n- breaked = false;\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- return this;\n- }\n-\n- public LightWriter ans(String s) {\n- if (!breaked) {\n- print(' ');\n- }\n- return print(s);\n- }\n-\n- public LightWriter ans(int i) {\n- return ans(Integer.toString(i));\n- }\n-\n- public LightWriter ln() {\n- print(System.lineSeparator());\n- breaked = true;\n- if (autoflush) {\n- try {\n- out.flush();\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- }\n- return this;\n- }\n-\n- public void close() {\n- try {\n- out.close();\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n+ } else {\n+ iss[mo] = true;\n+ sum += 1;\n }\n }\n+ return sum;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 3.2783", "pair_id": "java_12875_forward", "problem_id": "p03045", "language": "java", "direction": "forward", "speedup_ratio": 9.7018} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n+ solve3027();\n+ }\n+\n+ public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n- }\n- System.out.println(Math.max(count1, count2));\n+\n+ int N = sc.nextInt();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n+\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ System.out.println(ans);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.0007", "pair_id": "java_7309_reversed", "problem_id": "p02125", "language": "java", "direction": "reversed", "speedup_ratio": 1.0005} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n-\n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n \n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n }\n \n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ return false;\n }\n }", "output": "FASTER 1.0422", "pair_id": "java_4733_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.0593} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- String s = sc.next();\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- for (int j = i + max + 1; j < n; j++) {\n- if (0 < s.indexOf(s.substring(i, j), j)) {\n- max = j - i;\n- } else {\n- break;\n- }\n+ int N = sc.nextInt();\n+ String S = sc.next();\n+ sc.close();\n+ int r = -1;\n+ String s = \"\";\n+ long ans = 0;\n+ for (int l = 0; l < N; l++) {\n+ while (l - 1 > r) {\n+ r++;\n }\n+ while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n+ s += S.charAt(r + 1);\n+ r++;\n+ }\n+ ans = Math.max(r - l + 1, ans);\n+ if (s.length() >= 2) s = s.substring(1);\n+ else if (s.length() == 1) s = \"\";\n }\n- System.out.println(max);\n- sc.close();\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.5377", "pair_id": "java_3827_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.4517} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.2393", "pair_id": "java_5815_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1804} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n+ }\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n \n- public int getX() {\n- return x;\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n }\n \n- public int getY() {\n- return y;\n- }\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n \n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n+ static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n \n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n try {\n- st = new StringTokenizer(br.readLine());\n+ s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n \n- int nextInt() {\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- long nextLong() {\n+ public long nextLong() {\n return Long.parseLong(next());\n }\n \n- double nextDouble() {\n+ public double nextDouble() {\n return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n }", "output": "FASTER 2.3895", "pair_id": "java_4741_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 5.2397} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n boolean nextBoolean() {\n return Boolean.parseBoolean(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws IOException {\n FastReader fr = new FastReader();\n int n = fr.nextInt();\n int a = fr.nextInt() - 1;\n int x = fr.nextInt() - 1;\n int b = fr.nextInt() - 1;\n int y = fr.nextInt() - 1;\n\n int i = a;\n int j = b;\n while (true) {\n\n if (i == j) {\n System.out.println(\"YES\");\n return;\n } else if (i == x || j == y) {\n System.out.println(\"NO\");\n return;\n } else {\n i = (i + 1) % (n);\n j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ACircleMetro solver = new ACircleMetro();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ACircleMetro {\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int a = in.nextInt();\n int x = in.nextInt();\n int b = in.nextInt();\n int y = in.nextInt();\n boolean flag = false;\n while (a != x && b != y) {\n if (a == n) a = 1;\n else a++;\n if (b == 1) b = n;\n else b--;\n if (a == b) {\n flag = true;\n break;\n }\n }\n if (flag) out.println(\"YES\");\n else out.println(\"NO\");\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ACircleMetro solver = new ACircleMetro();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ static class ACircleMetro {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int a = in.nextInt();\n+ int x = in.nextInt();\n+ int b = in.nextInt();\n+ int y = in.nextInt();\n+ boolean flag = false;\n+ while (a != x && b != y) {\n+ if (a == n) a = 1;\n+ else a++;\n+ if (b == 1) b = n;\n+ else b--;\n+ if (a == b) {\n+ flag = true;\n+ break;\n }\n }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- boolean nextBoolean() {\n- return Boolean.parseBoolean(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws IOException {\n- FastReader fr = new FastReader();\n- int n = fr.nextInt();\n- int a = fr.nextInt() - 1;\n- int x = fr.nextInt() - 1;\n- int b = fr.nextInt() - 1;\n- int y = fr.nextInt() - 1;\n-\n- int i = a;\n- int j = b;\n- while (true) {\n-\n- if (i == j) {\n- System.out.println(\"YES\");\n- return;\n- } else if (i == x || j == y) {\n- System.out.println(\"NO\");\n- return;\n- } else {\n- i = (i + 1) % (n);\n- j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n- }\n+ if (flag) out.println(\"YES\");\n+ else out.println(\"NO\");\n }\n }\n }", "output": "SLOWER 5.8372", "pair_id": "java_5829_reversed", "problem_id": "1169_A", "language": "java", "direction": "reversed", "speedup_ratio": 57.1715} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n- public static void main(String[] arg) {\n- Scanner in = new Scanner(System.in);\n- char[][] numbers = new char[100][];\n- int[] eqVal = new int[100];\n- for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n- int m = in.nextInt();\n+ static boolean check(char[] a, char[] b) {\n+ for (int i = 0; i < 8; i++) {\n+ if (a[i] != b[i] && a[i] != '*') return false;\n+ }\n+ return true;\n+ }\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+\n+ if (n == 0 && m == 0) break;\n+\n+ int money[] = new int[n];\n+ int hit = 0;\n+ String[] str1 = new String[n];\n+ String[] str2 = new String[m];\n+ char[][] a = new char[n][];\n+ char[][] b = new char[m][];\n+\n for (int i = 0; i < n; i++) {\n- numbers[i] = in.next().toCharArray();\n- eqVal[i] = in.nextInt();\n+ str1[i] = sc.next();\n+ a[i] = str1[i].toCharArray();\n+ money[i] = sc.nextInt();\n }\n- int val = 0;\n for (int i = 0; i < m; i++) {\n- char[] hNum = in.next().toCharArray();\n- for (int index = 0; index < n; index++) {\n- boolean isMuch = true;\n- for (int keta = 0; keta < 8; keta++) {\n- if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n- isMuch = false;\n- break;\n- }\n- }\n- if (isMuch) {\n- val += eqVal[index];\n- break;\n- }\n+ str2[i] = sc.next();\n+ b[i] = str2[i].toCharArray();\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ if (check(a[i], b[j])) hit += money[i];\n }\n }\n- System.out.println(val);\n+\n+ System.out.println(hit);\n }\n }\n }", "output": "FASTER 0.0428", "pair_id": "java_997_forward", "problem_id": "p01322", "language": "java", "direction": "forward", "speedup_ratio": 1.0301} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class B {\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- private static long N;\n- private static long LAST;\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n+ }\n \n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n- }\n- }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ pw.flush();\n }\n }", "output": "FASTER 0.5598", "pair_id": "java_5826_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.4741} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int M = sc.nextInt();\n List[] edges = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n edges[i] = new ArrayList();\n }\n for (int i = 0; i < M; i++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n int w = sc.nextInt();\n edges[x - 1].add(y - 1);\n edges[y - 1].add(x - 1);\n }\n boolean[] visited = new boolean[N];\n int ans = 0;\n for (int i = 0; i < N; i++) {\n if (visited[i]) continue;\n LinkedList queue = new LinkedList();\n queue.offerLast(i);\n visited[i] = true;\n ans++;\n while (queue.size() > 0) {\n int v = queue.pollFirst();\n for (int w : edges[v]) {\n if (visited[w]) continue;\n queue.offerLast(w);\n visited[w] = true;\n }\n }\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\nimport java.nio.charset.Charset;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n LightScanner in = new LightScanner(inputStream);\n LightWriter out = new LightWriter(outputStream);\n E1Or2 solver = new E1Or2();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class E1Or2 {\n public void solve(int testNumber, LightScanner in, LightWriter out) {\n\n int n = in.ints(), m = in.ints();\n IntUnionFind uf = new IntUnionFind(n);\n for (int i = 0; i < m; i++) {\n int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n uf.union(x, y);\n }\n out.ans(uf.size()).ln();\n }\n }\n\n static class LightScanner {\n private BufferedReader reader = null;\n private StringTokenizer tokenizer = null;\n\n public LightScanner(InputStream in) {\n reader = new BufferedReader(new InputStreamReader(in));\n }\n\n public String string() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int ints() {\n return Integer.parseInt(string());\n }\n }\n\n static final class IntUnionFind {\n private int groups;\n private final int[] nodes;\n private final int[] rank;\n\n public IntUnionFind(int n) {\n groups = n;\n nodes = new int[n];\n Arrays.fill(nodes, -1);\n rank = new int[n];\n }\n\n public int find(int i) {\n int ans = nodes[i];\n if (ans < 0) {\n return i;\n } else {\n return nodes[i] = find(ans);\n }\n }\n\n public int size() {\n return groups;\n }\n\n public boolean union(int x, int y) {\n x = find(x);\n y = find(y);\n if (x == y) {\n return false;\n } else if (rank[x] < rank[y]) {\n nodes[y] += nodes[x];\n nodes[x] = y;\n } else if (rank[x] == rank[y]) {\n rank[x]++;\n nodes[x] += nodes[y];\n nodes[y] = x;\n } else {\n nodes[x] += nodes[y];\n nodes[y] = x;\n }\n groups--;\n return true;\n }\n }\n\n static class LightWriter implements AutoCloseable {\n private final Writer out;\n private boolean autoflush = false;\n private boolean breaked = true;\n\n public LightWriter(Writer out) {\n this.out = out;\n }\n\n public LightWriter(OutputStream out) {\n this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n }\n\n public LightWriter print(char c) {\n try {\n out.write(c);\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter print(String s) {\n try {\n out.write(s, 0, s.length());\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter ans(String s) {\n if (!breaked) {\n print(' ');\n }\n return print(s);\n }\n\n public LightWriter ans(int i) {\n return ans(Integer.toString(i));\n }\n\n public LightWriter ln() {\n print(System.lineSeparator());\n breaked = true;\n if (autoflush) {\n try {\n out.flush();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n return this;\n }\n\n public void close() {\n try {\n out.close();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+import java.nio.charset.Charset;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- int M = sc.nextInt();\n- List[] edges = new ArrayList[N];\n- for (int i = 0; i < N; i++) {\n- edges[i] = new ArrayList();\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ LightScanner in = new LightScanner(inputStream);\n+ LightWriter out = new LightWriter(outputStream);\n+ E1Or2 solver = new E1Or2();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class E1Or2 {\n+ public void solve(int testNumber, LightScanner in, LightWriter out) {\n+\n+ int n = in.ints(), m = in.ints();\n+ IntUnionFind uf = new IntUnionFind(n);\n+ for (int i = 0; i < m; i++) {\n+ int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n+ uf.union(x, y);\n+ }\n+ out.ans(uf.size()).ln();\n }\n- for (int i = 0; i < M; i++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- int w = sc.nextInt();\n- edges[x - 1].add(y - 1);\n- edges[y - 1].add(x - 1);\n+ }\n+\n+ static class LightScanner {\n+ private BufferedReader reader = null;\n+ private StringTokenizer tokenizer = null;\n+\n+ public LightScanner(InputStream in) {\n+ reader = new BufferedReader(new InputStreamReader(in));\n }\n- boolean[] visited = new boolean[N];\n- int ans = 0;\n- for (int i = 0; i < N; i++) {\n- if (visited[i]) continue;\n- LinkedList queue = new LinkedList();\n- queue.offerLast(i);\n- visited[i] = true;\n- ans++;\n- while (queue.size() > 0) {\n- int v = queue.pollFirst();\n- for (int w : edges[v]) {\n- if (visited[w]) continue;\n- queue.offerLast(w);\n- visited[w] = true;\n+\n+ public String string() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n }\n }\n+ return tokenizer.nextToken();\n }\n- System.out.println(ans);\n+\n+ public int ints() {\n+ return Integer.parseInt(string());\n+ }\n+ }\n+\n+ static final class IntUnionFind {\n+ private int groups;\n+ private final int[] nodes;\n+ private final int[] rank;\n+\n+ public IntUnionFind(int n) {\n+ groups = n;\n+ nodes = new int[n];\n+ Arrays.fill(nodes, -1);\n+ rank = new int[n];\n+ }\n+\n+ public int find(int i) {\n+ int ans = nodes[i];\n+ if (ans < 0) {\n+ return i;\n+ } else {\n+ return nodes[i] = find(ans);\n+ }\n+ }\n+\n+ public int size() {\n+ return groups;\n+ }\n+\n+ public boolean union(int x, int y) {\n+ x = find(x);\n+ y = find(y);\n+ if (x == y) {\n+ return false;\n+ } else if (rank[x] < rank[y]) {\n+ nodes[y] += nodes[x];\n+ nodes[x] = y;\n+ } else if (rank[x] == rank[y]) {\n+ rank[x]++;\n+ nodes[x] += nodes[y];\n+ nodes[y] = x;\n+ } else {\n+ nodes[x] += nodes[y];\n+ nodes[y] = x;\n+ }\n+ groups--;\n+ return true;\n+ }\n+ }\n+\n+ static class LightWriter implements AutoCloseable {\n+ private final Writer out;\n+ private boolean autoflush = false;\n+ private boolean breaked = true;\n+\n+ public LightWriter(Writer out) {\n+ this.out = out;\n+ }\n+\n+ public LightWriter(OutputStream out) {\n+ this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n+ }\n+\n+ public LightWriter print(char c) {\n+ try {\n+ out.write(c);\n+ breaked = false;\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ return this;\n+ }\n+\n+ public LightWriter print(String s) {\n+ try {\n+ out.write(s, 0, s.length());\n+ breaked = false;\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ return this;\n+ }\n+\n+ public LightWriter ans(String s) {\n+ if (!breaked) {\n+ print(' ');\n+ }\n+ return print(s);\n+ }\n+\n+ public LightWriter ans(int i) {\n+ return ans(Integer.toString(i));\n+ }\n+\n+ public LightWriter ln() {\n+ print(System.lineSeparator());\n+ breaked = true;\n+ if (autoflush) {\n+ try {\n+ out.flush();\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ try {\n+ out.close();\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ }\n }\n }", "output": "SLOWER 2.864", "pair_id": "java_12876_reversed", "problem_id": "p03045", "language": "java", "direction": "reversed", "speedup_ratio": 7.2805} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n }\n+ return st.nextToken();\n+ }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n }\n }\n }", "output": "SLOWER 0.05", "pair_id": "java_5801_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0353} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.util.HashMap;\n+import java.util.Map;\n+import java.util.Scanner;\n \n-public class Main {\n- static HashMap map;\n- static HashMap pos;\n+public class Skulptor2 {\n \n- static void update(long value, int temp, int i) {\n- if (!map.containsKey(value)) {\n- map.put(value, temp);\n- pos.put(value, i);\n+ public static void main(String[] args) {\n+ Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n+ int n = scan.nextInt();\n+\n+ L2Map map = new L2Map();\n+ Parallelepiped[] data = new Parallelepiped[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n+ Parallelepiped p = new Parallelepiped(i, a, b, c);\n+ data[i] = p;\n+ map.put(p);\n+ }\n+\n+ int maxDiameter = -1;\n+ int first = -1, second = -1;\n+\n+ for (Parallelepiped p : data) {\n+ if (p.c > maxDiameter) {\n+ maxDiameter = p.c;\n+ first = p.index;\n+ second = -1;\n+ }\n+\n+ Parallelepiped p2 = map.get(p);\n+ if (p2 != null) {\n+ int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n+ if (d > maxDiameter) {\n+ first = p.index;\n+ second = p2.index;\n+ maxDiameter = d;\n+ }\n+ }\n+ }\n+\n+ if (second == -1) {\n+ System.out.println(1);\n+ System.out.println(first + 1);\n } else {\n- int val = map.get(value);\n- if (temp > val) {\n- map.put(value, temp);\n- pos.put(value, i);\n- }\n+ System.out.println(2);\n+ System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n \n- static int det(long temp) {\n- if (!map.containsKey(temp)) return 0;\n- return map.get(temp);\n+ static class Parallelepiped {\n+ final int index;\n+ final int a, b, c;\n+\n+ Parallelepiped(int index, int a, int b, int c) {\n+\n+ this.index = index;\n+\n+ int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n+ int m4 = Math.max(m1, m2),\n+ m5 = Math.min(Math.min(m1, m2), m3),\n+ m6 = Math.min(Math.min(a, b), c);\n+\n+ this.a = m4;\n+ this.b = m5;\n+ this.c = m6;\n+ }\n }\n \n- public static void main(String[] args) throws Exception {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- int n = Integer.parseInt(br.readLine());\n- StringTokenizer st;\n- map = new HashMap<>();\n- pos = new HashMap<>();\n- long mod = (long) 1E9 + 7;\n- int ans = 0;\n- int single = -1;\n- int next = -1;\n- int postemp = -1;\n- for (int i = 1; i <= n; i++) {\n- st = new StringTokenizer(br.readLine());\n- int a = Integer.parseInt(st.nextToken());\n- int b = Integer.parseInt(st.nextToken());\n- int c = Integer.parseInt(st.nextToken());\n- int min = Math.min(a, Math.min(b, c));\n- if (ans < min) {\n- ans = min;\n- single = i;\n- next = -1;\n+ static class L2Map {\n+ private Map> map =\n+ new HashMap>();\n+\n+ void put(Parallelepiped v) {\n+\n+ Map map2 = map.get(v.a);\n+ if (map2 == null) {\n+ map2 = new HashMap();\n+ map.put(v.a, map2);\n }\n- int val = det(Math.min(a, b) * mod + Math.max(a, b));\n- if (val > 0) {\n- postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n- val = Math.min(a, Math.min(b, val + c));\n- if (ans < val) {\n- ans = val;\n- single = i;\n- next = postemp;\n- }\n+\n+ Parallelepiped[] currentVs = map2.get(v.b);\n+ if (currentVs == null) {\n+ currentVs = new Parallelepiped[2];\n+ currentVs[0] = v;\n+ map2.put(v.b, currentVs);\n+ } else {\n+ if (currentVs[0].c < v.c) {\n+ currentVs[1] = currentVs[0];\n+ currentVs[0] = v;\n+ } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n- int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n- if (val1 > 0) {\n- postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n- val1 = Math.min(a, Math.min(c, b + val1));\n- if (ans < val1) {\n- ans = val1;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n- if (val2 > 0) {\n- postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n- val2 = Math.min(b, Math.min(c, a + val2));\n- if (ans < val2) {\n- ans = val2;\n- single = i;\n- next = postemp;\n- }\n- }\n- update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n- update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n- update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n- if (next == -1) {\n- System.out.println(\"1\");\n- System.out.println(single);\n- return;\n+\n+ Parallelepiped get(Parallelepiped p) {\n+ Map map2 = map.get(p.a);\n+ if (map2 == null) return null;\n+ Parallelepiped[] values = map2.get(p.b);\n+ if (values == null) return null;\n+ if (values[0] == p) return values[1];\n+ else return values[0];\n }\n- System.out.println(\"2\");\n- System.out.println(single + \" \" + next);\n }\n }", "output": "FASTER 1.3795", "pair_id": "java_9717_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 2.6017} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Demo {\n+public class CF300A {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n+ int n = sc.nextInt();\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n \n- public static void main(String[] args) {\n+ for (int i = 0; i < n; i++) {\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n+ }\n \n- int n, n1, n2, n3;\n- Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n- int[] arr = new int[n];\n-\n- for (int i = 0; i < arr.length; i++) {\n- arr[i] = sc.nextInt();\n-\n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n+ break;\n+ }\n }\n }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n- }\n \n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n+ int[] num = new int[n];\n \n- for (int i = 0; i < arr.length; i++) {\n-\n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n }\n }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n- }\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n \n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n }\n- System.out.println(\"\");\n+ pr.flush();\n }\n }", "output": "FASTER 0.0689", "pair_id": "java_6821_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0489} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.IntBinaryOperator;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n+public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ StringBuilder out = new StringBuilder();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ final int N = nextInt(sc);\n+ final int Q = nextInt(sc);\n \n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n- } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n+ IntDualSegmentTree t =\n+ new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n+ for (int j = 0; j < Q; j++) {\n+ int q = nextInt(sc);\n+ switch (q) {\n+ case 0:\n+ int l = nextInt(sc);\n+ int r = nextInt(sc) + 1;\n+ int x = nextInt(sc);\n+ t.apply(l, r, x);\n+ break;\n+ case 1:\n+ int i = nextInt(sc);\n+ out.append(t.get(i)).append('\\n');\n+ break;\n+ default:\n+ break;\n+ }\n+ }\n+ sc.close();\n+ pw.write(out.toString());\n+ pw.flush();\n+ pw.close();\n+ }\n+\n+ public static int nextInt(Scanner sc) {\n+ return Integer.parseInt(sc.next());\n+ }\n+\n+ public static long nextLong(Scanner sc) {\n+ return Long.parseLong(sc.next());\n+ }\n+}\n+\n+class IntDualSegmentTree {\n+\n+ final int[] Dat;\n+\n+ final int[] Laz;\n+\n+ final int N;\n+\n+ final int L;\n+\n+ final int E1;\n+\n+ final IntBinaryOperator G;\n+\n+ final IntBinaryOperator H;\n+\n+ final int[] Stack = new int[64];\n+\n+ public IntDualSegmentTree(\n+ int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ Arrays.fill(Dat, initialValue);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n+ this.E1 = e1;\n+ this.G = g;\n+ this.H = h;\n+ int n = src.length;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.L = n;\n+ this.Dat = new int[k];\n+ this.Laz = new int[k << 1];\n+ System.arraycopy(src, 0, Dat, 0, src.length);\n+ Arrays.fill(Laz, e1);\n+ }\n+\n+ public void apply(int l, int r, int v) {\n+ if (l < 0 || l > L || r < 0 || r > L) {\n+ throw new IndexOutOfBoundsException(\n+ String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n+ }\n+ if (l >= r) return;\n+ updown(l, r);\n+ l += N;\n+ r += N;\n+ for (; l < r; l >>= 1, r >>= 1) {\n+ if ((l & 1) != 0) {\n+ Laz[l] = H.applyAsInt(Laz[l], v);\n+ l++;\n+ }\n+ if ((r & 1) != 0) {\n+ r--;\n+ Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n \n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ public int get(int i) {\n+ if (i < 0 || i >= L) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n+ }\n+ int k = 1;\n+ int l = 0, r = N;\n+ while (k < N) {\n+ propagate(k);\n+ int kl = k << 1 | 0;\n+ int kr = k << 1 | 1;\n+ int m = (l + r) >> 1;\n+ if (m > i) {\n+ r = m;\n+ k = kl;\n+ } else {\n+ l = m;\n+ k = kr;\n+ }\n+ }\n+ propagate(k);\n+ return Dat[k - N];\n+ }\n+\n+ void updown(int l, int r) {\n+ int i = 0;\n+ int kl = l + N, kr = r + N;\n+ for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n+ 0 < kl && kl < kr;\n+ kl >>= 1, kr >>= 1) {\n+ if (kl <= x) Stack[i++] = kl;\n+ if (kr <= y) Stack[i++] = kr;\n+ }\n+ for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n+ while (i > 0) propagate(Stack[--i]);\n+ }\n+\n+ void propagate(int k) {\n+ int lz = Laz[k];\n+ if (lz != E1) {\n+ if (k < N) {\n+ int l = k << 1 | 0, r = k << 1 | 1;\n+ Laz[l] = H.applyAsInt(Laz[l], lz);\n+ Laz[r] = H.applyAsInt(Laz[r], lz);\n+ } else {\n+ Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n+ }\n+ Laz[k] = E1;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ int[] a = {0, 1, 2, 3, 4, 5};\n+ IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n+ System.out.println(t1);\n+ t1.apply(0, 3, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n+ t1.apply(2, 4, 10);\n+ System.out.println(t1);\n+ System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n }", "output": "FASTER 0.4607", "pair_id": "java_5741_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.3762} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n+\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n+\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n+ }\n+\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n- pw.flush();\n }\n }", "output": "FASTER 0.518", "pair_id": "java_5805_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.432} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- String S = sc.next();\n- sc.close();\n- int r = -1;\n- String s = \"\";\n- long ans = 0;\n- for (int l = 0; l < N; l++) {\n- while (l - 1 > r) {\n- r++;\n+ int num = Integer.parseInt(sc.next());\n+ String str = sc.next();\n+\n+ int res = 0;\n+ for (int len = num; len > 0; len--) {\n+ int[] dp = new int[num];\n+ for (int i = num - len - 1; i >= 0; i--) {\n+ if (str.charAt(i) == str.charAt(i + len)) {\n+ dp[i] = Math.min(dp[i + 1] + 1, len);\n+ res = Math.max(res, dp[i]);\n+ } else {\n+ dp[i] = 0;\n+ }\n }\n- while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n- s += S.charAt(r + 1);\n- r++;\n- }\n- ans = Math.max(r - l + 1, ans);\n- if (s.length() >= 2) s = s.substring(1);\n- else if (s.length() == 1) s = \"\";\n }\n- System.out.println(ans);\n+\n+ System.out.println(res);\n }\n }", "output": "FASTER 0.3926", "pair_id": "java_3834_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.3128} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n- }\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n+ }\n+ }\n+\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 1.3295", "pair_id": "java_4764_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.5131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class JavaApplication42 {\n \n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+ public static void main(String[] args) {\n+\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n- }\n-\n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.1313", "pair_id": "java_209_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0953} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n- public static void main(String[] args) {\n-\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n-\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n-\n- System.out.println((X - A) % B);\n+ System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n }", "output": "SLOWER 0.1223", "pair_id": "java_6633_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0885} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+ }\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }", "output": "SLOWER 0.9952", "pair_id": "java_4754_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.9933} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.util.*;\n \n-public class Main {\n- public static class SegmentTree {\n- int[] tree;\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n- }\n-\n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n- }\n- return r;\n- }\n-\n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n- }\n- }\n-\n- public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n-\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n \n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "SLOWER 1.6783", "pair_id": "java_5726_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 3.2004} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Array {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n int n = s.nextInt();\n int[] arr = new int[n];\n int plus = 0;\n for (int i = 0; i < n; i++) {\n arr[i] = s.nextInt();\n if (arr[i] > 0) plus++;\n }\n List neg = new ArrayList<>();\n List pos = new ArrayList<>();\n List z = new ArrayList<>();\n if (plus > 0) {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else z.add(x);\n } else {\n if (pos.size() == 0) pos.add(x);\n else z.add(x);\n }\n }\n } else {\n for (int i = 0; i < n; i++) {\n int x = arr[i];\n if (x == 0) z.add(x);\n else if (x < 0) {\n if (neg.size() == 0) neg.add(x);\n else if (pos.size() < 2) pos.add(x);\n else z.add(x);\n }\n }\n }\n print(neg);\n print(pos);\n print(z);\n }\n\n private static void print(List arr) {\n System.out.print(arr.size() + \" \");\n for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n System.out.println();\n return;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n+public class Array {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n+ int n = s.nextInt();\n+ int[] arr = new int[n];\n+ int plus = 0;\n for (int i = 0; i < n; i++) {\n-\n- x[i] = Integer.parseInt(st.nextToken());\n-\n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n+ arr[i] = s.nextInt();\n+ if (arr[i] > 0) plus++;\n }\n-\n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n+ List neg = new ArrayList<>();\n+ List pos = new ArrayList<>();\n+ List z = new ArrayList<>();\n+ if (plus > 0) {\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else z.add(x);\n+ } else {\n+ if (pos.size() == 0) pos.add(x);\n+ else z.add(x);\n }\n }\n } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n- break;\n+ for (int i = 0; i < n; i++) {\n+ int x = arr[i];\n+ if (x == 0) z.add(x);\n+ else if (x < 0) {\n+ if (neg.size() == 0) neg.add(x);\n+ else if (pos.size() < 2) pos.add(x);\n+ else z.add(x);\n }\n }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n- }\n }\n+ print(neg);\n+ print(pos);\n+ print(z);\n+ }\n+\n+ private static void print(List arr) {\n+ System.out.print(arr.size() + \" \");\n+ for (int i = 0; i < arr.size(); i++) System.out.print(arr.get(i) + \" \");\n+ System.out.println();\n+ return;\n }\n }", "output": "SLOWER 1.7442", "pair_id": "java_6813_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.3502} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class helloWorld {\n+public class Main {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n-\n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n- System.out.println(ans);\n-\n- in.close();\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += (i * (i + 1));\n+ }\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.1076", "pair_id": "java_187_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0774} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n+import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n- }\n+ static class sort implements Comparable {\n+ int a, b, c;\n+\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n \n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n+ pw.close();\n+ }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n \n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.0109", "pair_id": "java_5750_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0076} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n- static void move(int[] shells, int i) {\n- int a, b;\n-\n- if (i % 2 == 0) {\n- a = 1;\n- b = 2;\n- } else {\n- a = 0;\n- b = 1;\n- }\n-\n- int tmp = shells[a];\n- shells[a] = shells[b];\n- shells[b] = tmp;\n- }\n-\n- static String getState(int[] shells, int i) {\n- String state = Integer.toString(i % 2);\n-\n- state += Integer.toString(shells[0]);\n- state += Integer.toString(shells[1]);\n- state += Integer.toString(shells[2]);\n-\n- return state;\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt();\n- int x = in.nextInt();\n-\n- int[] shells = new int[3];\n- shells[x] = 1;\n-\n- ArrayList states = new ArrayList<>();\n-\n- for (int i = n; i >= 0; i--) {\n- String state = getState(shells, i);\n-\n- int idx = states.indexOf(state);\n-\n- if (idx != -1) {\n-\n- break;\n- }\n-\n- states.add(state);\n-\n- if (i > 0) {\n- move(shells, i);\n- }\n- }\n-\n- int cycleLength = states.size();\n- int r = n % cycleLength;\n-\n- System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n+public class ShellGame {\n+ public static void main(String[] args) {\n+ Scanner nw = new Scanner(System.in);\n+ int n = nw.nextInt();\n+ int pos = nw.nextInt();\n+ String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n+ (n) %= elm.length;\n+ System.out.println(elm[n].charAt(pos));\n }\n }", "output": "FASTER 0.0056", "pair_id": "java_429_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0039} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n City[] cities = new City[n];\n for (int i = 0; i < n; ++i) {\n cities[i] = new City(i);\n }\n for (int i = 0; i < m; ++i) {\n City a = cities[in.nextInt() - 1];\n City b = cities[in.nextInt() - 1];\n a.outgo.add(b);\n }\n int[][] dd = new int[n][n];\n City[] q = new City[n];\n for (int i = 0; i < n; ++i) {\n for (City x : cities) {\n x.dist = -1;\n }\n cities[i].dist = 0;\n int qt = 0;\n int qh = 1;\n q[0] = cities[i];\n while (qt < qh) {\n City cur = q[qt++];\n for (City other : cur.outgo) {\n if (other.dist < 0) {\n other.dist = cur.dist + 1;\n q[qh++] = other;\n }\n }\n }\n for (int j = 0; j < n; ++j) {\n dd[i][j] = cities[j].dist;\n }\n }\n\n int[] first = new int[n];\n int[] next = new int[n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[i][j];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestOut[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[j][i];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestIn[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n\n City ra = null;\n City rb = null;\n City rc = null;\n City rd = null;\n int res = 0;\n\n for (City b : cities) {\n b.mark = true;\n for (City c : cities)\n if (!c.mark) {\n int bc = dd[b.index][c.index];\n if (bc < 0) continue;\n c.mark = true;\n for (City a : b.closestIn)\n if (a != null && !a.mark) {\n int ab = dd[a.index][b.index];\n if (ab < 0) continue;\n a.mark = true;\n for (City d : c.closestOut)\n if (d != null && !d.mark) {\n int cd = dd[c.index][d.index];\n if (cd < 0) continue;\n d.mark = true;\n int cur = ab + bc + cd;\n if (cur > res) {\n res = cur;\n ra = a;\n rb = b;\n rc = c;\n rd = d;\n }\n d.mark = false;\n }\n a.mark = false;\n }\n c.mark = false;\n }\n b.mark = false;\n }\n\n out.println(\n (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n\n static class City {\n int index;\n int dist;\n List outgo = new ArrayList<>(1);\n boolean mark = false;\n City[] closestIn = new City[3];\n City[] closestOut = new City[3];\n\n public City(int index) {\n this.index = index;\n }\n }\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.lang.reflect.Constructor;\nimport java.util.ArrayDeque;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collection;\nimport java.util.InputMismatchException;\nimport java.util.Iterator;\nimport java.util.LinkedList;\nimport java.util.StringTokenizer;\n\npublic class CodeB {\n private static final boolean SHOULD_BUFFER_OUTPUT = false;\n\n static final SuperWriter sw = new SuperWriter(System.out);\n\n static final SuperScanner sc = new SuperScanner();\n\n static Node[] nodes;\n\n static class Answer implements Comparable {\n final int[] nodes;\n final int cost;\n\n Answer(int a, int b, int cost) {\n this.nodes = new int[] {a, b};\n this.cost = cost;\n }\n\n public Answer(Answer other, int id, int addedCost) {\n this.nodes = new int[other.nodes.length + 1];\n this.nodes[0] = id;\n for (int i = 0; i < other.nodes.length; i++) {\n this.nodes[i + 1] = other.nodes[i];\n }\n this.cost = other.cost + addedCost;\n }\n\n boolean contains(int id) {\n for (int i : nodes) {\n if (i == id) {\n return true;\n }\n }\n return false;\n }\n\n @Override\n public int compareTo(Answer o) {\n return o.cost - cost;\n }\n }\n\n static Answer[] tmpSort;\n\n static Answer[] getN(ArrayList values, int n) {\n Answer[] answer = new Answer[n];\n int currentMinIndex = 0;\n int currentSize = 0;\n for (Answer v : values) {\n if (currentSize != n) {\n answer[currentSize++] = v;\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n } else {\n if (v.cost > answer[currentMinIndex].cost) {\n answer[currentMinIndex] = v;\n }\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n }\n }\n Arrays.sort(answer);\n return answer;\n }\n\n static class Node {\n final ArrayList edges = new ArrayList<>();\n final int id;\n int visitedCost;\n int[] costs;\n Answer[] first;\n Answer[] second;\n\n Node(int id) {\n this.id = id;\n }\n\n Answer[] getFirst() {\n if (first != null) {\n return first;\n }\n ArrayList firstTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n firstTmp.add(new Answer(id, i, cost));\n }\n first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n return first;\n }\n\n Answer[] getSecond() {\n if (second != null) {\n return second;\n }\n LinkedList missing = new LinkedList<>();\n for (int i = 0; i < nodes.length; i++) {\n if (i != id) {\n missing.add(i);\n }\n }\n ArrayList secondTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n for (Answer answer : nodes[i].getFirst()) {\n if (!answer.contains(id)) {\n secondTmp.add(new Answer(answer, id, cost));\n }\n }\n }\n Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n ArrayList relevants = new ArrayList<>();\n for (Answer answer : secondTmp2) {\n if (missing.isEmpty()) {\n break;\n }\n boolean relevant = false;\n Iterator it = missing.iterator();\n while (it.hasNext()) {\n int next = it.next();\n if (!answer.contains(next)) {\n it.remove();\n relevant = true;\n }\n }\n if (relevant) {\n relevants.add(answer);\n }\n }\n return second = relevants.toArray(new Answer[0]);\n }\n\n Answer getSolution(int first, int cost) {\n for (Answer answer : getSecond()) {\n if (!answer.contains(first)) {\n return new Answer(answer, first, cost);\n }\n }\n return null;\n }\n\n Answer getSolution() {\n Answer best = null;\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n Answer possible = nodes[i].getSolution(id, cost);\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n return best;\n }\n }\n\n static int[] getCosts(Node[] nodes, int fromNode) {\n for (Node node : nodes) {\n node.visitedCost = Integer.MAX_VALUE;\n }\n int[] answer = new int[nodes.length];\n Arrays.fill(answer, Integer.MAX_VALUE);\n answer[fromNode] = 0;\n nodes[fromNode].visitedCost = 0;\n ArrayDeque queue = new ArrayDeque<>();\n queue.add(nodes[fromNode]);\n while (!queue.isEmpty()) {\n Node current = queue.pollFirst();\n for (Node edge : current.edges) {\n if (edge.visitedCost != Integer.MAX_VALUE) {\n continue;\n }\n answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n queue.add(edge);\n }\n }\n return answer;\n }\n\n public static void main() {\n int n = sc.nextInt();\n int m = sc.nextInt();\n nodes = new Node[n];\n tmpSort = new Answer[4 * (m + 1)];\n for (int i = 0; i < n; i++) {\n nodes[i] = new Node(i);\n }\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n nodes[u].edges.add(nodes[v]);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n Answer best = null;\n for (int i = 0; i < n; i++) {\n Answer possible = nodes[i].getSolution();\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n for (int i = 0; i < 4; i++) {\n best.nodes[i]++;\n }\n sw.printLine(best.nodes);\n }\n\n static class LineScanner extends Scanner {\n private StringTokenizer st;\n\n public LineScanner(String input) {\n st = new StringTokenizer(input);\n }\n\n @Override\n public String next() {\n return st.hasMoreTokens() ? st.nextToken() : null;\n }\n\n @Override\n public String nextLine() {\n throw new RuntimeException(\"not supported\");\n }\n\n public boolean hasNext() {\n return st.hasMoreTokens();\n }\n\n private final ArrayList temp = new ArrayList();\n\n private void fillTemp() {\n while (st.hasMoreTokens()) {\n temp.add(st.nextToken());\n }\n }\n\n public String[] asStringArray() {\n fillTemp();\n String[] answer = new String[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = (String) temp.get(i);\n }\n temp.clear();\n return answer;\n }\n\n public int[] asIntArray() {\n fillTemp();\n int[] answer = new int[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Integer.parseInt((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public long[] asLongArray() {\n fillTemp();\n long[] answer = new long[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Long.parseLong((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public double[] asDoubleArray() {\n fillTemp();\n double[] answer = new double[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Double.parseDouble((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n }\n\n static class SuperScanner extends Scanner {\n private InputStream stream;\n private byte[] buf = new byte[8096];\n private int curChar;\n private int numChars;\n\n public SuperScanner() {\n this.stream = System.in;\n }\n\n public int read() {\n if (numChars == -1) return -1;\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public static boolean isWhitespace(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n public static boolean isLineEnd(int c) {\n return c == '\\n' || c == -1;\n }\n\n private final StringBuilder sb = new StringBuilder();\n\n @Override\n public String next() {\n int c = read();\n while (isWhitespace(c)) {\n if (c == -1) {\n return null;\n }\n c = read();\n }\n sb.setLength(0);\n do {\n sb.append((char) c);\n c = read();\n } while (!isWhitespace(c));\n return sb.toString();\n }\n\n @Override\n public String nextLine() {\n sb.setLength(0);\n int c;\n while (true) {\n c = read();\n if (!isLineEnd(c)) {\n sb.append((char) c);\n } else {\n break;\n }\n }\n if (c == -1 && sb.length() == 0) {\n return null;\n } else {\n if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n return sb.substring(0, sb.length() - 1);\n } else {\n return sb.toString();\n }\n }\n }\n\n public LineScanner nextLineScanner() {\n String line = nextLine();\n if (line == null) {\n return null;\n } else {\n return new LineScanner(line);\n }\n }\n\n public LineScanner nextNonEmptyLineScanner() {\n while (true) {\n String line = nextLine();\n if (line == null) {\n return null;\n } else if (!line.isEmpty()) {\n return new LineScanner(line);\n }\n }\n }\n\n @Override\n public int nextInt() {\n int c = read();\n while (isWhitespace(c)) {\n c = read();\n }\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n\n @Override\n public long nextLong() {\n int c = read();\n while (isWhitespace(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n long res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n }\n\n abstract static class Scanner {\n\n public abstract String next();\n\n public abstract String nextLine();\n\n public int nextIntOrQuit() {\n Integer n = nextInteger();\n if (n == null) {\n sw.close();\n System.exit(0);\n }\n return n.intValue();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public int[] nextIntArray(int n) {\n int[] res = new int[n];\n for (int i = 0; i < res.length; i++) res[i] = nextInt();\n return res;\n }\n\n public long[] nextLongArray(int n) {\n long[] res = new long[n];\n for (int i = 0; i < res.length; i++) res[i] = nextLong();\n return res;\n }\n\n public double[] nextDoubleArray(int n) {\n double[] res = new double[n];\n for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n return res;\n }\n\n public void sortIntArray(int[] array) {\n Integer[] vals = new Integer[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortLongArray(long[] array) {\n Long[] vals = new Long[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortDoubleArray(double[] array) {\n Double[] vals = new Double[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public String[] nextStringArray(int n) {\n String[] vals = new String[n];\n for (int i = 0; i < n; i++) vals[i] = next();\n return vals;\n }\n\n public Integer nextInteger() {\n String s = next();\n if (s == null) return null;\n return Integer.parseInt(s);\n }\n\n public int[][] nextIntMatrix(int n, int m) {\n int[][] ans = new int[n][];\n for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n return ans;\n }\n\n public char[][] nextGrid(int r) {\n char[][] grid = new char[r][];\n for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n return grid;\n }\n\n public static T fill(T arreglo, int val) {\n if (arreglo instanceof Object[]) {\n Object[] a = (Object[]) arreglo;\n for (Object x : a) fill(x, val);\n } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n return arreglo;\n }\n\n public T[] nextObjectArray(Class clazz, int size) {\n @SuppressWarnings(\"unchecked\")\n T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n for (int c = 0; c < 3; c++) {\n Constructor constructor;\n try {\n if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n else constructor = clazz.getDeclaredConstructor();\n } catch (Exception e) {\n continue;\n }\n try {\n for (int i = 0; i < result.length; i++) {\n if (c == 0) result[i] = constructor.newInstance(this, i);\n else if (c == 1) result[i] = constructor.newInstance(this);\n else result[i] = constructor.newInstance();\n }\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n return result;\n }\n throw new RuntimeException(\"Constructor not found\");\n }\n\n public Collection wrap(int[] as) {\n ArrayList ans = new ArrayList();\n for (int i : as) ans.add(i);\n return ans;\n }\n\n public int[] unwrap(Collection collection) {\n int[] vals = new int[collection.size()];\n int index = 0;\n for (int i : collection) vals[index++] = i;\n return vals;\n }\n\n int testCases = Integer.MIN_VALUE;\n\n boolean testCases() {\n if (testCases == Integer.MIN_VALUE) {\n testCases = nextInt();\n }\n return --testCases >= 0;\n }\n }\n\n static class SuperWriter {\n\n private final PrintWriter writer;\n\n public SuperWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public SuperWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void close() {\n writer.flush();\n writer.close();\n }\n\n public void printLine(String line) {\n writer.println(line);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(long... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int prec, double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n String precision = \"%.\" + prec + \"f\";\n writer.print(String.format(precision, vals[0]).replace(',', '.'));\n precision = \" \" + precision;\n for (int i = 1; i < vals.length; i++)\n writer.print(String.format(precision, vals[i]).replace(',', '.'));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(Collection vals) {\n if (vals.size() == 0) {\n writer.println();\n } else {\n int i = 0;\n for (E val : vals) {\n if (i++ == 0) {\n writer.print(val.toString());\n } else {\n writer.print(\" \".concat(val.toString()));\n }\n }\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printSimple(String value) {\n writer.print(value);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public boolean ifZeroExit(Number... values) {\n for (Number number : values) {\n if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n return false;\n }\n }\n close();\n System.exit(0);\n return true;\n }\n }\n\n public static void main(String[] args) {\n main();\n sw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStream;\n-import java.io.InputStreamReader;\n import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.lang.reflect.Constructor;\n+import java.util.ArrayDeque;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.List;\n+import java.util.Collection;\n+import java.util.InputMismatchException;\n+import java.util.Iterator;\n+import java.util.LinkedList;\n import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskB {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- City[] cities = new City[n];\n- for (int i = 0; i < n; ++i) {\n- cities[i] = new City(i);\n- }\n- for (int i = 0; i < m; ++i) {\n- City a = cities[in.nextInt() - 1];\n- City b = cities[in.nextInt() - 1];\n- a.outgo.add(b);\n- }\n- int[][] dd = new int[n][n];\n- City[] q = new City[n];\n- for (int i = 0; i < n; ++i) {\n- for (City x : cities) {\n- x.dist = -1;\n- }\n- cities[i].dist = 0;\n- int qt = 0;\n- int qh = 1;\n- q[0] = cities[i];\n- while (qt < qh) {\n- City cur = q[qt++];\n- for (City other : cur.outgo) {\n- if (other.dist < 0) {\n- other.dist = cur.dist + 1;\n- q[qh++] = other;\n- }\n+public class CodeB {\n+ private static final boolean SHOULD_BUFFER_OUTPUT = false;\n+\n+ static final SuperWriter sw = new SuperWriter(System.out);\n+\n+ static final SuperScanner sc = new SuperScanner();\n+\n+ static Node[] nodes;\n+\n+ static class Answer implements Comparable {\n+ final int[] nodes;\n+ final int cost;\n+\n+ Answer(int a, int b, int cost) {\n+ this.nodes = new int[] {a, b};\n+ this.cost = cost;\n+ }\n+\n+ public Answer(Answer other, int id, int addedCost) {\n+ this.nodes = new int[other.nodes.length + 1];\n+ this.nodes[0] = id;\n+ for (int i = 0; i < other.nodes.length; i++) {\n+ this.nodes[i + 1] = other.nodes[i];\n+ }\n+ this.cost = other.cost + addedCost;\n+ }\n+\n+ boolean contains(int id) {\n+ for (int i : nodes) {\n+ if (i == id) {\n+ return true;\n+ }\n+ }\n+ return false;\n+ }\n+\n+ @Override\n+ public int compareTo(Answer o) {\n+ return o.cost - cost;\n+ }\n+ }\n+\n+ static Answer[] tmpSort;\n+\n+ static Answer[] getN(ArrayList values, int n) {\n+ Answer[] answer = new Answer[n];\n+ int currentMinIndex = 0;\n+ int currentSize = 0;\n+ for (Answer v : values) {\n+ if (currentSize != n) {\n+ answer[currentSize++] = v;\n+ int min = Integer.MAX_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ if (answer[i] != null && answer[i].cost < min) {\n+ currentMinIndex = i;\n+ min = answer[i].cost;\n }\n }\n- for (int j = 0; j < n; ++j) {\n- dd[i][j] = cities[j].dist;\n- }\n- }\n-\n- int[] first = new int[n];\n- int[] next = new int[n];\n- for (int i = 0; i < n; ++i) {\n- Arrays.fill(first, -1);\n- for (int j = 0; j < n; ++j) {\n- int cd = dd[i][j];\n- if (cd < 0) continue;\n- next[j] = first[cd];\n- first[cd] = j;\n- }\n- int ptr = 0;\n- outer:\n- for (int cd = n - 1; cd >= 1; --cd) {\n- int cur = first[cd];\n- while (cur >= 0) {\n- cities[i].closestOut[ptr] = cities[cur];\n- ++ptr;\n- if (ptr == 3) break outer;\n- cur = next[cur];\n+ } else {\n+ if (v.cost > answer[currentMinIndex].cost) {\n+ answer[currentMinIndex] = v;\n+ }\n+ int min = Integer.MAX_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ if (answer[i] != null && answer[i].cost < min) {\n+ currentMinIndex = i;\n+ min = answer[i].cost;\n }\n }\n }\n- for (int i = 0; i < n; ++i) {\n- Arrays.fill(first, -1);\n- for (int j = 0; j < n; ++j) {\n- int cd = dd[j][i];\n- if (cd < 0) continue;\n- next[j] = first[cd];\n- first[cd] = j;\n- }\n- int ptr = 0;\n- outer:\n- for (int cd = n - 1; cd >= 1; --cd) {\n- int cur = first[cd];\n- while (cur >= 0) {\n- cities[i].closestIn[ptr] = cities[cur];\n- ++ptr;\n- if (ptr == 3) break outer;\n- cur = next[cur];\n+ }\n+ Arrays.sort(answer);\n+ return answer;\n+ }\n+\n+ static class Node {\n+ final ArrayList edges = new ArrayList<>();\n+ final int id;\n+ int visitedCost;\n+ int[] costs;\n+ Answer[] first;\n+ Answer[] second;\n+\n+ Node(int id) {\n+ this.id = id;\n+ }\n+\n+ Answer[] getFirst() {\n+ if (first != null) {\n+ return first;\n+ }\n+ ArrayList firstTmp = new ArrayList<>();\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ firstTmp.add(new Answer(id, i, cost));\n+ }\n+ first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n+ return first;\n+ }\n+\n+ Answer[] getSecond() {\n+ if (second != null) {\n+ return second;\n+ }\n+ LinkedList missing = new LinkedList<>();\n+ for (int i = 0; i < nodes.length; i++) {\n+ if (i != id) {\n+ missing.add(i);\n+ }\n+ }\n+ ArrayList secondTmp = new ArrayList<>();\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ for (Answer answer : nodes[i].getFirst()) {\n+ if (!answer.contains(id)) {\n+ secondTmp.add(new Answer(answer, id, cost));\n }\n }\n }\n-\n- City ra = null;\n- City rb = null;\n- City rc = null;\n- City rd = null;\n+ Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n+ ArrayList relevants = new ArrayList<>();\n+ for (Answer answer : secondTmp2) {\n+ if (missing.isEmpty()) {\n+ break;\n+ }\n+ boolean relevant = false;\n+ Iterator it = missing.iterator();\n+ while (it.hasNext()) {\n+ int next = it.next();\n+ if (!answer.contains(next)) {\n+ it.remove();\n+ relevant = true;\n+ }\n+ }\n+ if (relevant) {\n+ relevants.add(answer);\n+ }\n+ }\n+ return second = relevants.toArray(new Answer[0]);\n+ }\n+\n+ Answer getSolution(int first, int cost) {\n+ for (Answer answer : getSecond()) {\n+ if (!answer.contains(first)) {\n+ return new Answer(answer, first, cost);\n+ }\n+ }\n+ return null;\n+ }\n+\n+ Answer getSolution() {\n+ Answer best = null;\n+ for (int i = 0; i < costs.length; i++) {\n+ int cost = costs[i];\n+ if ((i == id) || (cost == Integer.MAX_VALUE)) {\n+ continue;\n+ }\n+ Answer possible = nodes[i].getSolution(id, cost);\n+ if (possible != null) {\n+ if (best == null || possible.cost > best.cost) {\n+ best = possible;\n+ }\n+ }\n+ }\n+ return best;\n+ }\n+ }\n+\n+ static int[] getCosts(Node[] nodes, int fromNode) {\n+ for (Node node : nodes) {\n+ node.visitedCost = Integer.MAX_VALUE;\n+ }\n+ int[] answer = new int[nodes.length];\n+ Arrays.fill(answer, Integer.MAX_VALUE);\n+ answer[fromNode] = 0;\n+ nodes[fromNode].visitedCost = 0;\n+ ArrayDeque queue = new ArrayDeque<>();\n+ queue.add(nodes[fromNode]);\n+ while (!queue.isEmpty()) {\n+ Node current = queue.pollFirst();\n+ for (Node edge : current.edges) {\n+ if (edge.visitedCost != Integer.MAX_VALUE) {\n+ continue;\n+ }\n+ answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n+ queue.add(edge);\n+ }\n+ }\n+ return answer;\n+ }\n+\n+ public static void main() {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ nodes = new Node[n];\n+ tmpSort = new Answer[4 * (m + 1)];\n+ for (int i = 0; i < n; i++) {\n+ nodes[i] = new Node(i);\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = sc.nextInt() - 1;\n+ int v = sc.nextInt() - 1;\n+ nodes[u].edges.add(nodes[v]);\n+ }\n+ for (int i = 0; i < n; i++) {\n+ nodes[i].costs = getCosts(nodes, i);\n+ }\n+ for (int i = 0; i < n; i++) {\n+ nodes[i].costs = getCosts(nodes, i);\n+ }\n+ Answer best = null;\n+ for (int i = 0; i < n; i++) {\n+ Answer possible = nodes[i].getSolution();\n+ if (possible != null) {\n+ if (best == null || possible.cost > best.cost) {\n+ best = possible;\n+ }\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ best.nodes[i]++;\n+ }\n+ sw.printLine(best.nodes);\n+ }\n+\n+ static class LineScanner extends Scanner {\n+ private StringTokenizer st;\n+\n+ public LineScanner(String input) {\n+ st = new StringTokenizer(input);\n+ }\n+\n+ @Override\n+ public String next() {\n+ return st.hasMoreTokens() ? st.nextToken() : null;\n+ }\n+\n+ @Override\n+ public String nextLine() {\n+ throw new RuntimeException(\"not supported\");\n+ }\n+\n+ public boolean hasNext() {\n+ return st.hasMoreTokens();\n+ }\n+\n+ private final ArrayList temp = new ArrayList();\n+\n+ private void fillTemp() {\n+ while (st.hasMoreTokens()) {\n+ temp.add(st.nextToken());\n+ }\n+ }\n+\n+ public String[] asStringArray() {\n+ fillTemp();\n+ String[] answer = new String[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = (String) temp.get(i);\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public int[] asIntArray() {\n+ fillTemp();\n+ int[] answer = new int[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Integer.parseInt((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public long[] asLongArray() {\n+ fillTemp();\n+ long[] answer = new long[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Long.parseLong((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+\n+ public double[] asDoubleArray() {\n+ fillTemp();\n+ double[] answer = new double[temp.size()];\n+ for (int i = 0; i < answer.length; i++) {\n+ answer[i] = Double.parseDouble((String) temp.get(i));\n+ }\n+ temp.clear();\n+ return answer;\n+ }\n+ }\n+\n+ static class SuperScanner extends Scanner {\n+ private InputStream stream;\n+ private byte[] buf = new byte[8096];\n+ private int curChar;\n+ private int numChars;\n+\n+ public SuperScanner() {\n+ this.stream = System.in;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) return -1;\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n+ }\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public static boolean isWhitespace(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+\n+ public static boolean isLineEnd(int c) {\n+ return c == '\\n' || c == -1;\n+ }\n+\n+ private final StringBuilder sb = new StringBuilder();\n+\n+ @Override\n+ public String next() {\n+ int c = read();\n+ while (isWhitespace(c)) {\n+ if (c == -1) {\n+ return null;\n+ }\n+ c = read();\n+ }\n+ sb.setLength(0);\n+ do {\n+ sb.append((char) c);\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return sb.toString();\n+ }\n+\n+ @Override\n+ public String nextLine() {\n+ sb.setLength(0);\n+ int c;\n+ while (true) {\n+ c = read();\n+ if (!isLineEnd(c)) {\n+ sb.append((char) c);\n+ } else {\n+ break;\n+ }\n+ }\n+ if (c == -1 && sb.length() == 0) {\n+ return null;\n+ } else {\n+ if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n+ return sb.substring(0, sb.length() - 1);\n+ } else {\n+ return sb.toString();\n+ }\n+ }\n+ }\n+\n+ public LineScanner nextLineScanner() {\n+ String line = nextLine();\n+ if (line == null) {\n+ return null;\n+ } else {\n+ return new LineScanner(line);\n+ }\n+ }\n+\n+ public LineScanner nextNonEmptyLineScanner() {\n+ while (true) {\n+ String line = nextLine();\n+ if (line == null) {\n+ return null;\n+ } else if (!line.isEmpty()) {\n+ return new LineScanner(line);\n+ }\n+ }\n+ }\n+\n+ @Override\n+ public int nextInt() {\n+ int c = read();\n+ while (isWhitespace(c)) {\n+ c = read();\n+ }\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n int res = 0;\n-\n- for (City b : cities) {\n- b.mark = true;\n- for (City c : cities)\n- if (!c.mark) {\n- int bc = dd[b.index][c.index];\n- if (bc < 0) continue;\n- c.mark = true;\n- for (City a : b.closestIn)\n- if (a != null && !a.mark) {\n- int ab = dd[a.index][b.index];\n- if (ab < 0) continue;\n- a.mark = true;\n- for (City d : c.closestOut)\n- if (d != null && !d.mark) {\n- int cd = dd[c.index][d.index];\n- if (cd < 0) continue;\n- d.mark = true;\n- int cur = ab + bc + cd;\n- if (cur > res) {\n- res = cur;\n- ra = a;\n- rb = b;\n- rc = c;\n- rd = d;\n- }\n- d.mark = false;\n- }\n- a.mark = false;\n- }\n- c.mark = false;\n- }\n- b.mark = false;\n- }\n-\n- out.println(\n- (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n- }\n-\n- static class City {\n- int index;\n- int dist;\n- List outgo = new ArrayList<>(1);\n- boolean mark = false;\n- City[] closestIn = new City[3];\n- City[] closestOut = new City[3];\n-\n- public City(int index) {\n- this.index = index;\n- }\n- }\n- }\n-\n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res = (res << 3) + (res << 1);\n+ res += c - '0';\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return res * sgn;\n+ }\n+\n+ @Override\n+ public long nextLong() {\n+ int c = read();\n+ while (isWhitespace(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ long res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res = (res << 3) + (res << 1);\n+ res += c - '0';\n+ c = read();\n+ } while (!isWhitespace(c));\n+ return res * sgn;\n+ }\n+ }\n+\n+ abstract static class Scanner {\n+\n+ public abstract String next();\n+\n+ public abstract String nextLine();\n+\n+ public int nextIntOrQuit() {\n+ Integer n = nextInteger();\n+ if (n == null) {\n+ sw.close();\n+ System.exit(0);\n+ }\n+ return n.intValue();\n }\n \n public int nextInt() {\n return Integer.parseInt(next());\n }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public int[] nextIntArray(int n) {\n+ int[] res = new int[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextInt();\n+ return res;\n+ }\n+\n+ public long[] nextLongArray(int n) {\n+ long[] res = new long[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextLong();\n+ return res;\n+ }\n+\n+ public double[] nextDoubleArray(int n) {\n+ double[] res = new double[n];\n+ for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n+ return res;\n+ }\n+\n+ public void sortIntArray(int[] array) {\n+ Integer[] vals = new Integer[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public void sortLongArray(long[] array) {\n+ Long[] vals = new Long[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public void sortDoubleArray(double[] array) {\n+ Double[] vals = new Double[array.length];\n+ for (int i = 0; i < array.length; i++) vals[i] = array[i];\n+ Arrays.sort(vals);\n+ for (int i = 0; i < array.length; i++) array[i] = vals[i];\n+ }\n+\n+ public String[] nextStringArray(int n) {\n+ String[] vals = new String[n];\n+ for (int i = 0; i < n; i++) vals[i] = next();\n+ return vals;\n+ }\n+\n+ public Integer nextInteger() {\n+ String s = next();\n+ if (s == null) return null;\n+ return Integer.parseInt(s);\n+ }\n+\n+ public int[][] nextIntMatrix(int n, int m) {\n+ int[][] ans = new int[n][];\n+ for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n+ return ans;\n+ }\n+\n+ public char[][] nextGrid(int r) {\n+ char[][] grid = new char[r][];\n+ for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n+ return grid;\n+ }\n+\n+ public static T fill(T arreglo, int val) {\n+ if (arreglo instanceof Object[]) {\n+ Object[] a = (Object[]) arreglo;\n+ for (Object x : a) fill(x, val);\n+ } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n+ else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n+ else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n+ return arreglo;\n+ }\n+\n+ public T[] nextObjectArray(Class clazz, int size) {\n+ @SuppressWarnings(\"unchecked\")\n+ T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n+ for (int c = 0; c < 3; c++) {\n+ Constructor constructor;\n+ try {\n+ if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n+ else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n+ else constructor = clazz.getDeclaredConstructor();\n+ } catch (Exception e) {\n+ continue;\n+ }\n+ try {\n+ for (int i = 0; i < result.length; i++) {\n+ if (c == 0) result[i] = constructor.newInstance(this, i);\n+ else if (c == 1) result[i] = constructor.newInstance(this);\n+ else result[i] = constructor.newInstance();\n+ }\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n+ return result;\n+ }\n+ throw new RuntimeException(\"Constructor not found\");\n+ }\n+\n+ public Collection wrap(int[] as) {\n+ ArrayList ans = new ArrayList();\n+ for (int i : as) ans.add(i);\n+ return ans;\n+ }\n+\n+ public int[] unwrap(Collection collection) {\n+ int[] vals = new int[collection.size()];\n+ int index = 0;\n+ for (int i : collection) vals[index++] = i;\n+ return vals;\n+ }\n+\n+ int testCases = Integer.MIN_VALUE;\n+\n+ boolean testCases() {\n+ if (testCases == Integer.MIN_VALUE) {\n+ testCases = nextInt();\n+ }\n+ return --testCases >= 0;\n+ }\n+ }\n+\n+ static class SuperWriter {\n+\n+ private final PrintWriter writer;\n+\n+ public SuperWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public SuperWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void close() {\n+ writer.flush();\n+ writer.close();\n+ }\n+\n+ public void printLine(String line) {\n+ writer.println(line);\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(int... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(long... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(double... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ writer.print(vals[0]);\n+ for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(int prec, double... vals) {\n+ if (vals.length == 0) {\n+ writer.println();\n+ } else {\n+ String precision = \"%.\" + prec + \"f\";\n+ writer.print(String.format(precision, vals[0]).replace(',', '.'));\n+ precision = \" \" + precision;\n+ for (int i = 1; i < vals.length; i++)\n+ writer.print(String.format(precision, vals[i]).replace(',', '.'));\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printLine(Collection vals) {\n+ if (vals.size() == 0) {\n+ writer.println();\n+ } else {\n+ int i = 0;\n+ for (E val : vals) {\n+ if (i++ == 0) {\n+ writer.print(val.toString());\n+ } else {\n+ writer.print(\" \".concat(val.toString()));\n+ }\n+ }\n+ writer.println();\n+ }\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public void printSimple(String value) {\n+ writer.print(value);\n+ if (!SHOULD_BUFFER_OUTPUT) {\n+ writer.flush();\n+ }\n+ }\n+\n+ public boolean ifZeroExit(Number... values) {\n+ for (Number number : values) {\n+ if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n+ return false;\n+ }\n+ }\n+ close();\n+ System.exit(0);\n+ return true;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ main();\n+ sw.close();\n }\n }", "output": "FASTER 1.3623", "pair_id": "java_6747_forward", "problem_id": "666_B", "language": "java", "direction": "forward", "speedup_ratio": 2.5709} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n+\n+ public static void main(String[] args) {\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- System.out.println(p);\n+\n+ out.println(weight);\n+\n+ in.close();\n+ out.close();\n }\n }", "output": "SLOWER 0.0329", "pair_id": "java_203_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0231} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n-\n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n+ return str;\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ public static void main(String[] args) throws java.lang.Exception {\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n \n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ System.out.println(m + no);\n }\n-\n- q--;\n }\n }\n }", "output": "SLOWER 0.5731", "pair_id": "java_5786_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.4877} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n+\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n }\n \n public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n+ }\n+\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ }\n+ return false;\n }\n }", "output": "FASTER 3.6468", "pair_id": "java_4736_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 12.5251} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n+import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class EducationalRound49B {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- public static void main(String[] args) {\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n- }\n- q--;\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n }\n- out.close();\n+\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n+ }\n }\n \n- public static PrintWriter out;\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ long n = nextLong();\n+ int q = nextInt();\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n+ pw.close();\n+ }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- long nextLong() {\n- return Long.parseLong(next());\n- }\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n \n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.0215", "pair_id": "java_5751_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.015} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class ProblemD {\n+public class helloWorld {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n \n- public static void main(String[] args) {\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n \n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "SLOWER 0.0334", "pair_id": "java_194_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0234} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n import java.util.*;\n \n-public class Main {\n+public class helloWorld {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n \n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n- }\n- }\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n \n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n+ System.out.println(ans);\n \n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ in.close();\n }\n }", "output": "FASTER 0.1086", "pair_id": "java_213_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0782} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n import java.util.StringTokenizer;\n \n-public class NumbersOnTheChessboard {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n+\n+ static class sort implements Comparable {\n+ int a, b, c;\n+\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n+ }\n+ }\n+\n public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ long n = nextLong();\n+ int q = nextInt();\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.6257", "pair_id": "java_5754_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.543} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-class Main {\n- static Scanner sc = new Scanner(System.in);\n-\n- public static void main(String[] args) throws Exception {\n- nint();\n- int q = nint();\n- TreeMap map = new TreeMap<>();\n- map.put(-1, Integer.MAX_VALUE);\n- while (q-- > 0) {\n- int command = nint();\n- if (command == 0) {\n- int s = nint();\n- int t = nint();\n- int x = nint();\n- int rightValue = map.floorEntry(t + 1).getValue();\n- map.subMap(s, t + 1).clear();\n- map.put(s, x);\n- map.put(t + 1, rightValue);\n+public class Main {\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n } else {\n- int i = nint();\n- System.out.println(map.floorEntry(i).getValue());\n- }\n- }\n- }\n-\n- static int nint() {\n- return Integer.parseInt(sc.next());\n+ return data[index];\n+ }\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n+ }\n }\n }", "output": "FASTER 1.3995", "pair_id": "java_5732_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.6381} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n- StringTokenizer st;\n+public class Main {\n \n- public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = bf.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n }\n }\n }", "output": "SLOWER 0.0407", "pair_id": "java_5808_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0286} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n- static class node {\n- int x;\n- int y;\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n+ }\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "SLOWER 0.6557", "pair_id": "java_4765_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.5754} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.util.*;\n \n-public class ProblemD {\n+public class Main {\n \n- public static void main(String[] args) {\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n+ }\n+ }\n \n- Scanner scanner = new Scanner(System.in);\n- int vertices = scanner.nextInt(), total = 0;\n- for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n- System.out.println(total);\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1421", "pair_id": "java_198_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.1035} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n- }\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n- }\n- }\n- return false;\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- }\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "FASTER 0.6557", "pair_id": "java_4765_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.5754} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n- }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 3.3944", "pair_id": "java_4744_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 10.5154} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class Main {\n+public class EducationalRound49B {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n+\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n out.close();\n }\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n- }\n- }\n- }\n- }\n+ public static PrintWriter out;\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n+ } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n \n- public int nextInt() {\n+ int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() {\n return Long.parseLong(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n }", "output": "SLOWER 0.0106", "pair_id": "java_5762_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class B {\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ private static long N;\n+ private static long LAST;\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n+\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n- return st.nextToken();\n- }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n }\n- return str;\n }\n }\n \n- public static void main(String[] args) throws java.lang.Exception {\n+ private static long number(long i, long j) {\n \n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- System.out.println(m + no);\n- }\n- }\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 0.7992", "pair_id": "java_5817_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class second {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- long n = sc.nextLong();\n- int q = sc.nextInt();\n- long last = (n * n + 1) / 2;\n- for (int rep = 0; rep < q; rep++) {\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n- x--;\n- y--;\n- long answer = 1 + (x * n + y) / 2;\n- if ((x + y) % 2 != 0) answer += last;\n- pw.println(answer);\n+public class Main {\n+\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n+ }\n }\n- pw.flush();\n }\n }", "output": "FASTER 0.4389", "pair_id": "java_5820_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.3556} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class EducationalRound49B {\n+public class B {\n+\n+ private static long N;\n+ private static long LAST;\n \n public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ LAST = N * N / 2 + (N & 1);\n+\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n- q--;\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n- out.close();\n }\n \n- public static PrintWriter out;\n+ private static long number(long i, long j) {\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 1.4535", "pair_id": "java_5782_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.7387} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class Main {\n- static long mod = 1000000007;\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n \n- public static void main(String[] args) throws Exception {\n- FastReader in = new FastReader();\n- PrintWriter pw = new PrintWriter(System.out);\n- int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n- int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n- int[][] c = new int[8][2];\n- for (int i = 0; i < 8; i++) {\n- int x = in.nextInt();\n- int y = in.nextInt();\n- if (i > 3) {\n- c[i][0] = x + y;\n- c[i][1] = y - x;\n- } else {\n- c[i][0] = x;\n- c[i][1] = y;\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n+ for (int i = 0; i < 4; i++) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n+ }\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n+ }\n+\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n- for (int i = 0; i < 4; i++) {\n- axmin = Math.min(axmin, c[i][0]);\n- axmax = Math.max(axmax, c[i][0]);\n- aymin = Math.min(aymin, c[i][1]);\n- aymax = Math.max(aymax, c[i][1]);\n- }\n- for (int i = 4; i < 8; i++) {\n- bxmin = Math.min(bxmin, c[i][0]);\n- bxmax = Math.max(bxmax, c[i][0]);\n- bymin = Math.min(bymin, c[i][1]);\n- bymax = Math.max(bymax, c[i][1]);\n- }\n- String ans = \"NO\";\n- for (int x = axmin; x <= axmax; x++) {\n- for (int y = aymin; y <= aymax; y++) {\n- if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n- }\n- }\n- pw.print(ans);\n- pw.flush();\n- }\n \n- public static long inverse(long a) {\n- long r = 1, p = mod - 2;\n- while (p > 0) {\n- if (p % 2 == 1) {\n- r *= a;\n- r %= mod;\n- }\n- p >>= 1;\n- a = (a * a) % mod;\n- }\n-\n- return r;\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }\n-\n-class pair {\n- A f;\n- B s;\n-\n- public pair(A a, B b) {\n- f = a;\n- s = b;\n- }\n-}\n-\n-class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() throws IOException {\n- if (st == null || !st.hasMoreElements()) {\n- st = new StringTokenizer(br.readLine());\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-}", "output": "SLOWER 6.3975", "pair_id": "java_4712_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 84.3} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n \n-public class EducationalRound49B {\n+public class Main {\n \n- public static void main(String[] args) {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n- q--;\n- }\n- out.close();\n- }\n-\n- public static PrintWriter out;\n-\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n }\n }\n }", "output": "SLOWER 0.6834", "pair_id": "java_5778_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.6059} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n+public class Demo {\n+\n+ public static void main(String[] args) {\n+\n+ int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n- for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n+ int[] arr = new int[n];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+ arr[i] = sc.nextInt();\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n+ }\n+ }\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n }\n \n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n+ }\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n+ }\n }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n- System.out.println();\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n+ }\n \n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n- System.out.println();\n-\n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n+ System.out.println(\"\");\n }\n }", "output": "SLOWER 0.0249", "pair_id": "java_6830_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0174} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n \n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n }\n- out.println(ans);\n+ System.out.println(dp[1][n]);\n }\n }\n \n- static class InputReader {\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n \n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n \n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 5.2048", "pair_id": "java_183_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 36.88} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n+public class EducationalRound49B {\n+\n+ public static void main(String[] args) {\n+\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ } else {\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ }\n+ q--;\n+ }\n+ out.close();\n+ }\n+\n+ public static PrintWriter out;\n+\n+ public static class FastReader {\n+ BufferedReader br;\n StringTokenizer st;\n \n public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n- while (st == null || !st.hasMoreElements()) {\n+ while (st == null || !st.hasMoreTokens()) {\n try {\n- st = new StringTokenizer(bf.readLine());\n- } catch (IOException e) {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return Integer.parseInt(next());\n }\n \n- float nextFloat() {\n- return Float.parseFloat(next());\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n long nextLong() {\n return Long.parseLong(next());\n }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n String nextLine() {\n String str = \"\";\n try {\n- str = bf.readLine();\n- } catch (IOException e) {\n+ str = br.readLine();\n+ } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n-\n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n- }\n- }\n }", "output": "FASTER 0.6427", "pair_id": "java_5776_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5612} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt(), q = in.nextInt();\n\n RUpdateQ rUpdateQ = new RUpdateQ(n);\n\n for (int i = 0; i < q; i++) {\n int cmd = in.nextInt();\n if (cmd == 0) {\n int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n rUpdateQ.update(s, t, x);\n }\n if (cmd == 1) {\n int index = in.nextInt();\n System.out.println(rUpdateQ.find(index));\n }\n }\n }\n}\n\nclass RUpdateQ {\n int[] heap;\n int n;\n\n static int _heap_size(int n) {\n int pow2 = 1;\n while (pow2 < n) {\n pow2 *= 2;\n }\n return pow2 * 2;\n }\n\n RUpdateQ(int n) {\n this.n = n;\n heap = new int[_heap_size(n)];\n Arrays.fill(heap, Integer.MAX_VALUE);\n }\n\n public void update(int s, int t, int x) {\n update(s, t + 1, x, 0, n, 1);\n }\n\n private void update(int s, int t, int x, int l, int r, int ih) {\n if (s >= t) {\n return;\n }\n if (s == l && t == r) {\n heap[ih] = x;\n return;\n }\n\n if (heap[ih] >= 0) {\n\n heap[ih * 2] = heap[ih];\n heap[ih * 2 + 1] = heap[ih];\n\n heap[ih] = -1;\n }\n\n int mid = (l + r) / 2;\n update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n }\n\n public int find(int index) {\n return find(index, 0, n, 1);\n }\n\n private int find(int index, int l, int r, int ih) {\n if (heap[ih] >= 0) {\n return heap[ih];\n } else {\n int mid = (l + r) / 2;\n if (index < mid) {\n return find(index, l, mid, ih * 2);\n } else {\n return find(index, mid, r, ih * 2 + 1);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String[] args) throws Exception {\n nint();\n int q = nint();\n TreeMap map = new TreeMap<>();\n map.put(-1, Integer.MAX_VALUE);\n while (q-- > 0) {\n int command = nint();\n if (command == 0) {\n int s = nint();\n int t = nint();\n int x = nint();\n int rightValue = map.floorEntry(t + 1).getValue();\n map.subMap(s, t + 1).clear();\n map.put(s, x);\n map.put(t + 1, rightValue);\n } else {\n int i = nint();\n System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n\n static int nint() {\n return Integer.parseInt(sc.next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n+class Main {\n+ static Scanner sc = new Scanner(System.in);\n \n- int n = in.nextInt(), q = in.nextInt();\n-\n- RUpdateQ rUpdateQ = new RUpdateQ(n);\n-\n- for (int i = 0; i < q; i++) {\n- int cmd = in.nextInt();\n- if (cmd == 0) {\n- int s = in.nextInt(), t = in.nextInt(), x = in.nextInt();\n- rUpdateQ.update(s, t, x);\n- }\n- if (cmd == 1) {\n- int index = in.nextInt();\n- System.out.println(rUpdateQ.find(index));\n+ public static void main(String[] args) throws Exception {\n+ nint();\n+ int q = nint();\n+ TreeMap map = new TreeMap<>();\n+ map.put(-1, Integer.MAX_VALUE);\n+ while (q-- > 0) {\n+ int command = nint();\n+ if (command == 0) {\n+ int s = nint();\n+ int t = nint();\n+ int x = nint();\n+ int rightValue = map.floorEntry(t + 1).getValue();\n+ map.subMap(s, t + 1).clear();\n+ map.put(s, x);\n+ map.put(t + 1, rightValue);\n+ } else {\n+ int i = nint();\n+ System.out.println(map.floorEntry(i).getValue());\n }\n }\n }\n-}\n \n-class RUpdateQ {\n- int[] heap;\n- int n;\n-\n- static int _heap_size(int n) {\n- int pow2 = 1;\n- while (pow2 < n) {\n- pow2 *= 2;\n- }\n- return pow2 * 2;\n- }\n-\n- RUpdateQ(int n) {\n- this.n = n;\n- heap = new int[_heap_size(n)];\n- Arrays.fill(heap, Integer.MAX_VALUE);\n- }\n-\n- public void update(int s, int t, int x) {\n- update(s, t + 1, x, 0, n, 1);\n- }\n-\n- private void update(int s, int t, int x, int l, int r, int ih) {\n- if (s >= t) {\n- return;\n- }\n- if (s == l && t == r) {\n- heap[ih] = x;\n- return;\n- }\n-\n- if (heap[ih] >= 0) {\n-\n- heap[ih * 2] = heap[ih];\n- heap[ih * 2 + 1] = heap[ih];\n-\n- heap[ih] = -1;\n- }\n-\n- int mid = (l + r) / 2;\n- update(Math.max(s, l), Math.min(mid, t), x, l, mid, ih * 2);\n- update(Math.max(s, mid), Math.min(t, r), x, mid, r, ih * 2 + 1);\n- }\n-\n- public int find(int index) {\n- return find(index, 0, n, 1);\n- }\n-\n- private int find(int index, int l, int r, int ih) {\n- if (heap[ih] >= 0) {\n- return heap[ih];\n- } else {\n- int mid = (l + r) / 2;\n- if (index < mid) {\n- return find(index, l, mid, ih * 2);\n- } else {\n- return find(index, mid, r, ih * 2 + 1);\n- }\n- }\n+ static int nint() {\n+ return Integer.parseInt(sc.next());\n }\n }", "output": "SLOWER 0.0992", "pair_id": "java_5744_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 1.0712} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n\n Scanner sc = new Scanner(System.in);\n long k = sc.nextLong();\n int x = sc.nextInt();\n int m = sc.nextInt();\n\n Set set = new HashSet();\n List list = new ArrayList();\n int now = x;\n set.add(now);\n list.add(now);\n int last = 0;\n for (long i = 0; i < k; i++) {\n now = (int) ((long) now * now % m);\n if (set.contains(now)) {\n last = now;\n break;\n } else {\n set.add(now);\n list.add(now);\n }\n }\n\n int loop_idx = 0;\n for (int i = 0; i < list.size(); i++) {\n if (list.get(i) == last) {\n loop_idx = i;\n }\n }\n\n long ans = 0;\n\n for (int i = 0; i < loop_idx; i++) {\n ans += list.get(i);\n }\n k -= loop_idx;\n\n long loop_sum = 0;\n for (int i = loop_idx; i < list.size(); i++) {\n loop_sum += list.get(i);\n }\n long len = list.size() - loop_idx;\n long block = k / len;\n ans += loop_sum * block;\n k %= len;\n\n for (int i = loop_idx; i < loop_idx + k; i++) {\n ans += list.get(i);\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n\n static int mod = (int) 998244353;\n static List> list = new ArrayList>();\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n long N = sc.nextLong();\n long X = sc.nextInt();\n int M = sc.nextInt();\n\n int[] m = new int[M];\n int[] v = new int[M];\n int s = 0;\n int t = 0;\n long ans = 0;\n if (X == 0) {\n System.out.println(0);\n return;\n }\n boolean flg = false;\n for (int i = 0; i < N; i++) {\n m[i] = (int) (X) % M;\n if (v[m[i]] == 0) {\n v[(int) m[i]] = i;\n } else {\n s = v[m[i]];\n t = i;\n flg = true;\n break;\n }\n ans = ans + m[i];\n X = (X * X) % M;\n }\n\n int d = 0;\n long w = 0;\n int x = 0;\n if (flg) {\n N = N - t;\n d = t - s;\n if (d != 0) w = N / d;\n else w = N;\n if (d != 0) x = (int) (N % d);\n else x = 0;\n }\n X = m[s];\n long sum = 0;\n long[] o = new long[M];\n for (int i = 0; i < d; i++) {\n o[i] = sum + (X) % M;\n X = (X * X) % M;\n sum = o[i];\n }\n\n ans = ans + (w * sum);\n if (x != 0) {\n ans = ans + o[x - 1];\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n+class Main {\n+\n+ static int mod = (int) 998244353;\n+ static List> list = new ArrayList>();\n+\n+ public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n- long k = sc.nextLong();\n- int x = sc.nextInt();\n- int m = sc.nextInt();\n+ long N = sc.nextLong();\n+ long X = sc.nextInt();\n+ int M = sc.nextInt();\n \n- Set set = new HashSet();\n- List list = new ArrayList();\n- int now = x;\n- set.add(now);\n- list.add(now);\n- int last = 0;\n- for (long i = 0; i < k; i++) {\n- now = (int) ((long) now * now % m);\n- if (set.contains(now)) {\n- last = now;\n+ int[] m = new int[M];\n+ int[] v = new int[M];\n+ int s = 0;\n+ int t = 0;\n+ long ans = 0;\n+ if (X == 0) {\n+ System.out.println(0);\n+ return;\n+ }\n+ boolean flg = false;\n+ for (int i = 0; i < N; i++) {\n+ m[i] = (int) (X) % M;\n+ if (v[m[i]] == 0) {\n+ v[(int) m[i]] = i;\n+ } else {\n+ s = v[m[i]];\n+ t = i;\n+ flg = true;\n break;\n- } else {\n- set.add(now);\n- list.add(now);\n }\n+ ans = ans + m[i];\n+ X = (X * X) % M;\n }\n \n- int loop_idx = 0;\n- for (int i = 0; i < list.size(); i++) {\n- if (list.get(i) == last) {\n- loop_idx = i;\n- }\n+ int d = 0;\n+ long w = 0;\n+ int x = 0;\n+ if (flg) {\n+ N = N - t;\n+ d = t - s;\n+ if (d != 0) w = N / d;\n+ else w = N;\n+ if (d != 0) x = (int) (N % d);\n+ else x = 0;\n+ }\n+ X = m[s];\n+ long sum = 0;\n+ long[] o = new long[M];\n+ for (int i = 0; i < d; i++) {\n+ o[i] = sum + (X) % M;\n+ X = (X * X) % M;\n+ sum = o[i];\n }\n \n- long ans = 0;\n-\n- for (int i = 0; i < loop_idx; i++) {\n- ans += list.get(i);\n- }\n- k -= loop_idx;\n-\n- long loop_sum = 0;\n- for (int i = loop_idx; i < list.size(); i++) {\n- loop_sum += list.get(i);\n- }\n- long len = list.size() - loop_idx;\n- long block = k / len;\n- ans += loop_sum * block;\n- k %= len;\n-\n- for (int i = loop_idx; i < loop_idx + k; i++) {\n- ans += list.get(i);\n+ ans = ans + (w * sum);\n+ if (x != 0) {\n+ ans = ans + o[x - 1];\n }\n \n System.out.println(ans);", "output": "FASTER 0.0331", "pair_id": "java_5946_forward", "problem_id": "p02550", "language": "java", "direction": "forward", "speedup_ratio": 1.0232} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class C {\n+ static class Point {\n+ int x, y;\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n+ public int getX() {\n+ return x;\n }\n \n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n+ public int getY() {\n+ return y;\n }\n \n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n }\n \n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n }\n \n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n }\n \n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ System.out.println(\"NO\");\n+ }\n+\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n }\n }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n }\n \n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n }\n- return false;\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n+ }\n+\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n+ }\n+ }\n+ }\n+\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n }", "output": "SLOWER 2.6516", "pair_id": "java_4734_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 6.2835} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class B {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- static long N;\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n- }\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n }\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n+ pw.close();\n+ }\n \n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n \n- public int nextInt() {\n- return (int) nextLong();\n- }\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n \n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n \n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n- }\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n }", "output": "FASTER 0.1598", "pair_id": "java_5753_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1171} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.util.StringTokenizer;\n \n-public class Demo {\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String s = br.readLine();\n+ StringTokenizer st = new StringTokenizer(s);\n+ int n = Integer.parseInt(st.nextToken());\n+ int countp = 0;\n+ int countn = 0;\n+ int countz = 0;\n+ int[] x = new int[n];\n+ s = br.readLine();\n+ st = new StringTokenizer(s);\n+ for (int i = 0; i < n; i++) {\n \n- public static void main(String[] args) {\n+ x[i] = Integer.parseInt(st.nextToken());\n \n- int n, n1, n2, n3;\n- Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n- int[] arr = new int[n];\n+ if (x[i] > 0) countp++;\n+ else if (x[i] < 0) countn++;\n+ else countz++;\n+ }\n \n- for (int i = 0; i < arr.length; i++) {\n- arr[i] = sc.nextInt();\n+ if (countn % 2 != 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 2) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n \n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 2) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 != 0) {\n+ System.out.print(countn + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + \" \");\n+\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ }\n+ } else if (countn % 2 == 0 && countp == 0) {\n+ int k = countn;\n+ System.out.print(countn - 3 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0 && k > 3) {\n+ System.out.print(x[i] + \" \");\n+ k--;\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countp + 2 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+\n+ if (x[i] < 0) {\n+ countn--;\n+ if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n+ }\n+ }\n+ System.out.println();\n+ System.out.print(countz + 1 + \" \");\n+ boolean flag = true;\n+ for (int i = x.length - 1; i > 0; i--) {\n+ if (x[i] == 0) System.out.print(x[i] + \" \");\n+ else if (x[i] < 0 && flag == true) {\n+ System.out.print(x[i] + \" \");\n+ flag = false;\n+ }\n+ }\n+ } else {\n+ int position = 0;\n+\n+ boolean flag = false;\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] < 0) {\n+ position = i;\n+ break;\n+ }\n+ }\n+ System.out.println(1 + \" \" + x[position]);\n+ System.out.print(countp + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] > 0) System.out.print(x[i] + \" \");\n+ }\n+ System.out.println();\n+ System.out.print(countz + countn - 1 + \" \");\n+ for (int i = 0; i < x.length; i++) {\n+ if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n- }\n-\n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n-\n- for (int i = 0; i < arr.length; i++) {\n-\n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n- }\n- }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n- }\n-\n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println(\"\");\n }\n }", "output": "FASTER 1.8049", "pair_id": "java_6816_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 3.4941} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.Scanner;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- String s = sc.next();\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- for (int j = i + max + 1; j < n; j++) {\n- if (0 < s.indexOf(s.substring(i, j), j)) {\n- max = j - i;\n- } else {\n- break;\n- }\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ String s = in.next();\n+\n+ HashSet set = new HashSet<>();\n+\n+ int len = 1;\n+ int lenMax = 0;\n+ for (int st = 0; st + len - 1 < n; st++) {\n+ String temp = s.substring(st, st + len);\n+\n+ while (s.indexOf(temp, st + len) > st) {\n+ len++;\n+ temp = s.substring(st, st + len);\n }\n+ lenMax = Math.max(lenMax, len - 1);\n }\n- System.out.println(max);\n- sc.close();\n+\n+ System.out.println(lenMax);\n+ in.close();\n }\n }", "output": "SLOWER 0.0429", "pair_id": "java_3823_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.0302} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+ private static final int INF = Integer.MAX_VALUE;\n+ static int n = 1;\n+ static int[] D;\n+ static int[] M;\n+ static int[] arr;\n \n- private static Scanner sc;\n- private static Printer pr;\n+ public static void main(String[] args) {\n \n- private static void solve() {\n- int n = sc.nextInt();\n- int[] data = new int[n];\n- Arrays.fill(data, (1 << 31) - 1);\n- RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+ Scanner sc = new Scanner(System.in);\n \n- int q = sc.nextInt();\n- for (int i = 0; i < q; i++) {\n- int cmd = sc.nextInt();\n+ int n1 = sc.nextInt();\n+ int op_num = sc.nextInt();\n+ String[] op = new String[op_num + 1];\n+ for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n \n- if (cmd == 0) {\n- int s = sc.nextInt();\n- int t = sc.nextInt();\n- int x = sc.nextInt();\n+ init(n1);\n+ arr = new int[op_num];\n \n- ruq.update(s, t + 1, x);\n- } else if (cmd == 1) {\n- int index = sc.nextInt();\n-\n- pr.println(ruq.find(index));\n- pr.flush();\n+ for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n+ String[] Split = op[i].split(\" \");\n+ int x, y, z;\n+ if (Integer.parseInt(Split[0]) == 0) {\n+ x = Integer.parseInt(Split[1]);\n+ y = Integer.parseInt(Split[2]);\n+ z = Integer.parseInt(Split[3]);\n+ arr[i1] = z;\n+ update(x, y + 1, 0, 0, n, mark);\n+ } else {\n+ x = Integer.parseInt(Split[1]);\n+ int result = find(x + n - 1, n);\n+ System.out.println(result);\n }\n+ i1++;\n+ mark++;\n }\n }\n \n- private static class RUQ_SqrtDecomposition {\n- int[] data;\n- int[] bakets;\n- int n;\n- int d;\n- int m;\n+ private static int find(int n1, int n2) {\n \n- static final int NULL = -1;\n+ int max = n1;\n+ for (int i = 0; n1 > 0; i++) {\n+ n1 = (n1 - 1) / 2;\n+ if (M[max] < M[n1]) max = n1;\n+ }\n+ int temp;\n+ if (M[max] == -1) temp = INF;\n+ else temp = arr[M[max]];\n \n- public RUQ_SqrtDecomposition(int[] data) {\n- this.n = data.length;\n- this.data = data;\n- this.d = (int) Math.sqrt(n);\n-\n- this.m = (n + d - 1) / d;\n- bakets = new int[m];\n- Arrays.fill(bakets, NULL);\n- }\n-\n- void update(int l, int r, int x) {\n- int bl = l / d;\n- int br = Math.min(r / d, m - 1);\n- for (int i = bl; i <= br; i++) {\n- int tmpl = i * d;\n- int tmpr = Math.min((i + 1) * d, n);\n- if (tmpl >= l && tmpr <= r) {\n- bakets[i] = x;\n- } else {\n- if (bakets[i] != NULL) {\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = bakets[i];\n- }\n- }\n- bakets[i] = NULL;\n-\n- tmpl = Math.max(tmpl, l);\n- tmpr = Math.min(tmpr, r);\n- for (int j = tmpl; j < tmpr; j++) {\n- data[j] = x;\n- }\n- }\n- }\n- }\n-\n- int find(int index) {\n- int bi = index / d;\n- if (bakets[bi] != NULL) {\n- return bakets[bi];\n- } else {\n- return data[index];\n- }\n- }\n+ return temp;\n }\n \n- public static void main(String[] args) {\n- sc = new Scanner(System.in);\n- pr = new Printer(System.out);\n+ public static void update(int a, int b, int k, int l, int r, int mark) {\n \n- solve();\n-\n- pr.close();\n- sc.close();\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ M[k] = mark;\n+ return;\n+ }\n+ update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n+ update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n \n- @SuppressWarnings(\"unused\")\n- private static class Scanner {\n- BufferedReader br;\n+ public static void init(int N) {\n \n- Scanner(InputStream in) {\n- br = new BufferedReader(new InputStreamReader(in));\n- }\n-\n- private boolean isPrintable(int ch) {\n- return ch >= '!' && ch <= '~';\n- }\n-\n- private boolean isCRLF(int ch) {\n- return ch == '\\n' || ch == '\\r' || ch == -1;\n- }\n-\n- private int nextPrintable() {\n- try {\n- int ch;\n- while (!isPrintable(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- return ch;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- String next() {\n- try {\n- int ch = nextPrintable();\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (isPrintable(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- int nextInt() {\n- try {\n-\n- boolean negative = false;\n- int res = 0;\n- int limit = -Integer.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Integer.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- int multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- long nextLong() {\n- try {\n-\n- boolean negative = false;\n- long res = 0;\n- long limit = -Long.MAX_VALUE;\n- int radix = 10;\n-\n- int fc = nextPrintable();\n- if (fc < '0') {\n- if (fc == '-') {\n- negative = true;\n- limit = Long.MIN_VALUE;\n- } else if (fc != '+') {\n- throw new NumberFormatException();\n- }\n- fc = br.read();\n- }\n- long multmin = limit / radix;\n-\n- int ch = fc;\n- do {\n- int digit = ch - '0';\n- if (digit < 0 || digit >= radix) {\n- throw new NumberFormatException();\n- }\n- if (res < multmin) {\n- throw new NumberFormatException();\n- }\n- res *= radix;\n- if (res < limit + digit) {\n- throw new NumberFormatException();\n- }\n- res -= digit;\n-\n- } while (isPrintable(ch = br.read()));\n-\n- return negative ? res : -res;\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- try {\n- int ch;\n- while (isCRLF(ch = br.read())) {\n- if (ch == -1) {\n- throw new NoSuchElementException();\n- }\n- }\n- StringBuilder sb = new StringBuilder();\n- do {\n- sb.appendCodePoint(ch);\n- } while (!isCRLF(ch = br.read()));\n-\n- return sb.toString();\n- } catch (IOException e) {\n- throw new NoSuchElementException();\n- }\n- }\n-\n- void close() {\n- try {\n- br.close();\n- } catch (IOException e) {\n-\n- }\n- }\n- }\n-\n- private static class Printer extends PrintWriter {\n- Printer(PrintStream out) {\n- super(out);\n+ n = 1;\n+ while (n < N) n *= 2;\n+ D = new int[n * 2 - 1];\n+ M = new int[n * 2 - 1];\n+ for (int i = 0; i < n * 2 - 1; i++) {\n+ D[i] = INF;\n+ M[i] = -1;\n }\n }\n }", "output": "SLOWER 1.4057", "pair_id": "java_5733_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 2.6494} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n+\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n+ }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+ }\n+\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n+\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n+ }\n+ }\n+ }\n+\n+ public static class line {\n+ double x;\n+ double y;\n+\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n+ }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n+\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n+\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 4.6233", "pair_id": "java_4719_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 24.6462} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n+import java.util.TreeMap;\n \n-public class Main {\n- static class Stone implements Comparable {\n- int a, b, c, position;\n+public class ProblemD {\n \n- Stone(int a, int b, int c, int d) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- this.position = d;\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt(), a[] = new int[3];\n+ int ans = 0, k[] = new int[2];\n+ TreeMap map = new TreeMap<>();\n+ for (int i = 0; i < n; i++) {\n+ a[0] = sc.nextInt();\n+ a[1] = sc.nextInt();\n+ a[2] = sc.nextInt();\n+ Arrays.sort(a);\n+\n+ if (!map.containsKey(new Pair(a[1], a[2]))) {\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ if (ans < a[0]) {\n+ ans = a[0];\n+ k[0] = i;\n+ k[1] = -1;\n+ }\n+ } else {\n+ Pair x = map.get(new Pair(a[1], a[2]));\n+ if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n+ ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n+ k[0] = x.first;\n+ k[1] = i;\n+ }\n+ if (x.second < a[0]) {\n+ map.remove(x);\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ }\n+ }\n }\n \n- Stone() {}\n+ if (k[1] == -1) {\n+ pw.println(1);\n+ pw.println(k[0] + 1);\n+ } else {\n+ pw.println(2);\n+ pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n+ }\n+ pw.flush();\n+ pw.close();\n+ }\n+\n+ static class Pair implements Comparable {\n+ int first, second;\n+\n+ public Pair(int f, int s) {\n+ first = f;\n+ second = s;\n+ }\n \n @Override\n- public int compareTo(Stone s) {\n- if (this.c < s.c) return -1;\n- else if (this.c > s.c) return 1;\n- else if (this.b < s.b) return -1;\n- else if (this.b > s.b) return 1;\n- else if (this.a < s.a) return -1;\n- else if (this.a > s.a) return 1;\n- else return 0;\n+ public int compareTo(Pair pair) {\n+ return first == pair.first ? second - pair.second : first - pair.first;\n+ }\n+\n+ public String toString() {\n+ return (\"First: \" + first + \" second: \" + second);\n }\n }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- while (sc.hasNext()) {\n- int n = sc.nextInt();\n- int max = -1;\n- int index = 0;\n- Stone[] s = new Stone[n];\n- int flag = 0;\n- int jg1 = 0;\n- int jg2 = 0;\n- int shu[] = new int[3];\n- for (int i = 0; i < n; i++) {\n- shu[0] = sc.nextInt();\n- shu[1] = sc.nextInt();\n- shu[2] = sc.nextInt();\n- Arrays.sort(shu);\n- s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n- if (max < shu[0]) {\n- index = i + 1;\n- max = shu[0];\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n+\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n }\n- }\n- Arrays.sort(s);\n- for (int i = 0; i < n - 1; i++) {\n- if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n- int[] bj = new int[3];\n- bj[0] = s[i].a + s[i + 1].a;\n- bj[1] = s[i].b;\n- bj[2] = s[i].c;\n- Arrays.sort(bj);\n- if (bj[0] > max) {\n- flag = 1;\n- max = bj[0];\n- jg1 = s[i].position;\n- jg2 = s[i + 1].position;\n- }\n- }\n- }\n- if (flag == 1) {\n- System.out.println(2);\n- System.out.println(jg1 + \" \" + jg2);\n- } else {\n- System.out.println(1);\n- System.out.println(index);\n- }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "SLOWER 3.0204", "pair_id": "java_9716_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 8.1142} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.*;\n-\n-public class C {\n- static class Point {\n- int x, y;\n-\n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 3.481", "pair_id": "java_4726_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 11.1659} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static class Stone implements Comparable {\n int a, b, c, position;\n\n Stone(int a, int b, int c, int d) {\n this.a = a;\n this.b = b;\n this.c = c;\n this.position = d;\n }\n\n Stone() {}\n\n @Override\n public int compareTo(Stone s) {\n if (this.c < s.c) return -1;\n else if (this.c > s.c) return 1;\n else if (this.b < s.b) return -1;\n else if (this.b > s.b) return 1;\n else if (this.a < s.a) return -1;\n else if (this.a > s.a) return 1;\n else return 0;\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n while (sc.hasNext()) {\n int n = sc.nextInt();\n int max = -1;\n int index = 0;\n Stone[] s = new Stone[n];\n int flag = 0;\n int jg1 = 0;\n int jg2 = 0;\n int shu[] = new int[3];\n for (int i = 0; i < n; i++) {\n shu[0] = sc.nextInt();\n shu[1] = sc.nextInt();\n shu[2] = sc.nextInt();\n Arrays.sort(shu);\n s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n if (max < shu[0]) {\n index = i + 1;\n max = shu[0];\n }\n }\n Arrays.sort(s);\n for (int i = 0; i < n - 1; i++) {\n if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n int[] bj = new int[3];\n bj[0] = s[i].a + s[i + 1].a;\n bj[1] = s[i].b;\n bj[2] = s[i].c;\n Arrays.sort(bj);\n if (bj[0] > max) {\n flag = 1;\n max = bj[0];\n jg1 = s[i].position;\n jg2 = s[i + 1].position;\n }\n }\n }\n if (flag == 1) {\n System.out.println(2);\n System.out.println(jg1 + \" \" + jg2);\n } else {\n System.out.println(1);\n System.out.println(index);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- static HashMap map;\n- static HashMap pos;\n+ static class Stone implements Comparable {\n+ int a, b, c, position;\n \n- static void update(long value, int temp, int i) {\n- if (!map.containsKey(value)) {\n- map.put(value, temp);\n- pos.put(value, i);\n- } else {\n- int val = map.get(value);\n- if (temp > val) {\n- map.put(value, temp);\n- pos.put(value, i);\n+ Stone(int a, int b, int c, int d) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ this.position = d;\n+ }\n+\n+ Stone() {}\n+\n+ @Override\n+ public int compareTo(Stone s) {\n+ if (this.c < s.c) return -1;\n+ else if (this.c > s.c) return 1;\n+ else if (this.b < s.b) return -1;\n+ else if (this.b > s.b) return 1;\n+ else if (this.a < s.a) return -1;\n+ else if (this.a > s.a) return 1;\n+ else return 0;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ while (sc.hasNext()) {\n+ int n = sc.nextInt();\n+ int max = -1;\n+ int index = 0;\n+ Stone[] s = new Stone[n];\n+ int flag = 0;\n+ int jg1 = 0;\n+ int jg2 = 0;\n+ int shu[] = new int[3];\n+ for (int i = 0; i < n; i++) {\n+ shu[0] = sc.nextInt();\n+ shu[1] = sc.nextInt();\n+ shu[2] = sc.nextInt();\n+ Arrays.sort(shu);\n+ s[i] = new Stone(shu[0], shu[1], shu[2], i + 1);\n+ if (max < shu[0]) {\n+ index = i + 1;\n+ max = shu[0];\n+ }\n+ }\n+ Arrays.sort(s);\n+ for (int i = 0; i < n - 1; i++) {\n+ if (s[i].b == s[i + 1].b && s[i].c == s[i + 1].c) {\n+ int[] bj = new int[3];\n+ bj[0] = s[i].a + s[i + 1].a;\n+ bj[1] = s[i].b;\n+ bj[2] = s[i].c;\n+ Arrays.sort(bj);\n+ if (bj[0] > max) {\n+ flag = 1;\n+ max = bj[0];\n+ jg1 = s[i].position;\n+ jg2 = s[i + 1].position;\n+ }\n+ }\n+ }\n+ if (flag == 1) {\n+ System.out.println(2);\n+ System.out.println(jg1 + \" \" + jg2);\n+ } else {\n+ System.out.println(1);\n+ System.out.println(index);\n }\n }\n }\n-\n- static int det(long temp) {\n- if (!map.containsKey(temp)) return 0;\n- return map.get(temp);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- int n = Integer.parseInt(br.readLine());\n- StringTokenizer st;\n- map = new HashMap<>();\n- pos = new HashMap<>();\n- long mod = (long) 1E9 + 7;\n- int ans = 0;\n- int single = -1;\n- int next = -1;\n- int postemp = -1;\n- for (int i = 1; i <= n; i++) {\n- st = new StringTokenizer(br.readLine());\n- int a = Integer.parseInt(st.nextToken());\n- int b = Integer.parseInt(st.nextToken());\n- int c = Integer.parseInt(st.nextToken());\n- int min = Math.min(a, Math.min(b, c));\n- if (ans < min) {\n- ans = min;\n- single = i;\n- next = -1;\n- }\n- int val = det(Math.min(a, b) * mod + Math.max(a, b));\n- if (val > 0) {\n- postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n- val = Math.min(a, Math.min(b, val + c));\n- if (ans < val) {\n- ans = val;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n- if (val1 > 0) {\n- postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n- val1 = Math.min(a, Math.min(c, b + val1));\n- if (ans < val1) {\n- ans = val1;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n- if (val2 > 0) {\n- postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n- val2 = Math.min(b, Math.min(c, a + val2));\n- if (ans < val2) {\n- ans = val2;\n- single = i;\n- next = postemp;\n- }\n- }\n- update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n- update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n- update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n- }\n- if (next == -1) {\n- System.out.println(\"1\");\n- System.out.println(single);\n- return;\n- }\n- System.out.println(\"2\");\n- System.out.println(single + \" \" + next);\n- }\n }", "output": "FASTER 2.2889", "pair_id": "java_9714_forward", "problem_id": "733_D", "language": "java", "direction": "forward", "speedup_ratio": 4.8867} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n- for (int i = 0; i < n; i++) {\n+public class R181D2A {\n \n- x[i] = Integer.parseInt(st.nextToken());\n-\n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n- }\n-\n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n- }\n- }\n- } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n- break;\n- }\n- }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n- }\n- }\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n }\n }\n+\n+class gao {\n+\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n+\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n+ }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ }\n+}", "output": "SLOWER 1.7687", "pair_id": "java_6814_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.4074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n\n Scanner sc = new Scanner(System.in);\n long k = sc.nextLong();\n int x = sc.nextInt();\n int m = sc.nextInt();\n\n Set set = new HashSet();\n List list = new ArrayList();\n int now = x;\n set.add(now);\n list.add(now);\n int last = 0;\n for (long i = 0; i < k; i++) {\n now = (int) ((long) now * now % m);\n if (set.contains(now)) {\n last = now;\n break;\n } else {\n set.add(now);\n list.add(now);\n }\n }\n\n int loop_idx = 0;\n for (int i = 0; i < list.size(); i++) {\n if (list.get(i) == last) {\n loop_idx = i;\n }\n }\n\n long ans = 0;\n\n for (int i = 0; i < loop_idx; i++) {\n ans += list.get(i);\n }\n k -= loop_idx;\n\n long loop_sum = 0;\n for (int i = loop_idx; i < list.size(); i++) {\n loop_sum += list.get(i);\n }\n long len = list.size() - loop_idx;\n long block = k / len;\n ans += loop_sum * block;\n k %= len;\n\n for (int i = loop_idx; i < loop_idx + k; i++) {\n ans += list.get(i);\n }\n\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner scanner = new Scanner(System.in)) {\n long n = scanner.nextLong();\n int x = scanner.nextInt(), m = scanner.nextInt();\n List list = new ArrayList<>();\n\n Set set = new HashSet<>();\n long next = x % m;\n list.add(next);\n set.add(next);\n while (list.size() < n) {\n next = next * next % m;\n if (set.contains(next)) {\n break;\n }\n set.add(next);\n list.add(next);\n }\n if (list.size() == n) {\n\n System.out.println(list.stream().mapToLong(i -> i).sum());\n } else {\n\n int start = list.indexOf(next);\n\n long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n\n long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n\n long bai = (n - start) / (list.size() - start);\n\n long remain = (n - start) % (list.size() - start);\n System.out.println(\n startSum\n + bai * loop\n + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n \n- Scanner sc = new Scanner(System.in);\n- long k = sc.nextLong();\n- int x = sc.nextInt();\n- int m = sc.nextInt();\n+ public static void main(String[] args) {\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ long n = scanner.nextLong();\n+ int x = scanner.nextInt(), m = scanner.nextInt();\n+ List list = new ArrayList<>();\n \n- Set set = new HashSet();\n- List list = new ArrayList();\n- int now = x;\n- set.add(now);\n- list.add(now);\n- int last = 0;\n- for (long i = 0; i < k; i++) {\n- now = (int) ((long) now * now % m);\n- if (set.contains(now)) {\n- last = now;\n- break;\n+ Set set = new HashSet<>();\n+ long next = x % m;\n+ list.add(next);\n+ set.add(next);\n+ while (list.size() < n) {\n+ next = next * next % m;\n+ if (set.contains(next)) {\n+ break;\n+ }\n+ set.add(next);\n+ list.add(next);\n+ }\n+ if (list.size() == n) {\n+\n+ System.out.println(list.stream().mapToLong(i -> i).sum());\n } else {\n- set.add(now);\n- list.add(now);\n+\n+ int start = list.indexOf(next);\n+\n+ long loop = list.stream().skip(start).mapToLong(i -> i).sum();\n+\n+ long startSum = list.stream().mapToLong(i -> i).limit(start).sum();\n+\n+ long bai = (n - start) / (list.size() - start);\n+\n+ long remain = (n - start) % (list.size() - start);\n+ System.out.println(\n+ startSum\n+ + bai * loop\n+ + list.stream().mapToLong(i -> i).skip(start).limit(remain).sum());\n }\n }\n-\n- int loop_idx = 0;\n- for (int i = 0; i < list.size(); i++) {\n- if (list.get(i) == last) {\n- loop_idx = i;\n- }\n- }\n-\n- long ans = 0;\n-\n- for (int i = 0; i < loop_idx; i++) {\n- ans += list.get(i);\n- }\n- k -= loop_idx;\n-\n- long loop_sum = 0;\n- for (int i = loop_idx; i < list.size(); i++) {\n- loop_sum += list.get(i);\n- }\n- long len = list.size() - loop_idx;\n- long block = k / len;\n- ans += loop_sum * block;\n- k %= len;\n-\n- for (int i = loop_idx; i < loop_idx + k; i++) {\n- ans += list.get(i);\n- }\n-\n- System.out.println(ans);\n }\n }", "output": "SLOWER 0.107", "pair_id": "java_5948_reversed", "problem_id": "p02550", "language": "java", "direction": "reversed", "speedup_ratio": 1.077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static boolean check(char[] a, char[] b) {\n for (int i = 0; i < 8; i++) {\n if (a[i] != b[i] && a[i] != '*') return false;\n }\n return true;\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n\n if (n == 0 && m == 0) break;\n\n int money[] = new int[n];\n int hit = 0;\n String[] str1 = new String[n];\n String[] str2 = new String[m];\n char[][] a = new char[n][];\n char[][] b = new char[m][];\n\n for (int i = 0; i < n; i++) {\n str1[i] = sc.next();\n a[i] = str1[i].toCharArray();\n money[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n str2[i] = sc.next();\n b[i] = str2[i].toCharArray();\n }\n\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n if (check(a[i], b[j])) hit += money[i];\n }\n }\n\n System.out.println(hit);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n- static boolean check(char[] a, char[] b) {\n- for (int i = 0; i < 8; i++) {\n- if (a[i] != b[i] && a[i] != '*') return false;\n- }\n- return true;\n- }\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n-\n- if (n == 0 && m == 0) break;\n-\n- int money[] = new int[n];\n- int hit = 0;\n- String[] str1 = new String[n];\n- String[] str2 = new String[m];\n- char[][] a = new char[n][];\n- char[][] b = new char[m][];\n-\n+ public static void main(String[] arg) {\n+ Scanner in = new Scanner(System.in);\n+ char[][] numbers = new char[100][];\n+ int[] eqVal = new int[100];\n+ for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n+ int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n- str1[i] = sc.next();\n- a[i] = str1[i].toCharArray();\n- money[i] = sc.nextInt();\n+ numbers[i] = in.next().toCharArray();\n+ eqVal[i] = in.nextInt();\n }\n+ int val = 0;\n for (int i = 0; i < m; i++) {\n- str2[i] = sc.next();\n- b[i] = str2[i].toCharArray();\n- }\n-\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- if (check(a[i], b[j])) hit += money[i];\n+ char[] hNum = in.next().toCharArray();\n+ for (int index = 0; index < n; index++) {\n+ boolean isMuch = true;\n+ for (int keta = 0; keta < 8; keta++) {\n+ if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n+ isMuch = false;\n+ break;\n+ }\n+ }\n+ if (isMuch) {\n+ val += eqVal[index];\n+ break;\n+ }\n }\n }\n-\n- System.out.println(hit);\n+ System.out.println(val);\n }\n }\n }", "output": "SLOWER 0.0428", "pair_id": "java_997_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 1.0301} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n+\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n- }\n-\n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n- }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 2.6144", "pair_id": "java_4750_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 6.1236} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class NumbersontheChessboard {\n- static class FastReader {\n- BufferedReader bf;\n+public class Ideone {\n+ public static class FastReader {\n+ BufferedReader br;\n StringTokenizer st;\n \n public FastReader() {\n- bf = new BufferedReader(new InputStreamReader(System.in));\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n- st = new StringTokenizer(bf.readLine());\n+ st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n \n int nextInt() {\n return Integer.parseInt(next());\n- }\n-\n- float nextFloat() {\n- return Float.parseFloat(next());\n }\n \n long nextLong() {\n String nextLine() {\n String str = \"\";\n try {\n- str = bf.readLine();\n+ str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n }\n \n- public static void main(String[] s) {\n- long n, a, b, i;\n- int q;\n- FastReader sc = new FastReader();\n- n = sc.nextLong();\n- long x;\n- if (n % 2 == 0) {\n- x = (n * n);\n- x /= 2;\n- } else {\n- x = (n * n);\n- x++;\n- x /= 2;\n- }\n- q = sc.nextInt();\n- for (i = 0; i < q; i++) {\n- a = sc.nextLong();\n- b = sc.nextLong();\n- long sum = (((a - 1) * n) + b + 1);\n- sum /= 2;\n- if ((a + b) % 2 == 0) System.out.println(sum);\n- else System.out.println((sum + x));\n+ public static void main(String[] args) throws java.lang.Exception {\n+\n+ FastReader scan = new FastReader();\n+ long n = scan.nextLong();\n+ long q = scan.nextLong();\n+ for (long i = 0; i < q; i++) {\n+ long x = scan.nextLong();\n+ long y = scan.nextLong();\n+ long sum = x + y;\n+ long d = n * (x - 1) + y;\n+ long no = (d + 1) / 2;\n+ long m;\n+ if (n % 2 == 0) {\n+ m = (long) ((n * n) / 2);\n+ } else {\n+ m = (long) ((n * n) / 2 + 1);\n+ }\n+ if (sum % 2 == 0) {\n+ System.out.println(no);\n+ } else {\n+\n+ System.out.println(m + no);\n+ }\n }\n }\n }", "output": "SLOWER 0.0116", "pair_id": "java_5807_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0081} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.Scanner;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int num = Integer.parseInt(sc.next());\n- String str = sc.next();\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ String s = in.next();\n \n- int res = 0;\n- for (int len = num; len > 0; len--) {\n- int[] dp = new int[num];\n- for (int i = num - len - 1; i >= 0; i--) {\n- if (str.charAt(i) == str.charAt(i + len)) {\n- dp[i] = Math.min(dp[i + 1] + 1, len);\n- res = Math.max(res, dp[i]);\n- } else {\n- dp[i] = 0;\n- }\n+ HashSet set = new HashSet<>();\n+\n+ int len = 1;\n+ int lenMax = 0;\n+ for (int st = 0; st + len - 1 < n; st++) {\n+ String temp = s.substring(st, st + len);\n+\n+ while (s.indexOf(temp, st + len) > st) {\n+ len++;\n+ temp = s.substring(st, st + len);\n }\n+ lenMax = Math.max(lenMax, len - 1);\n }\n \n- System.out.println(res);\n+ System.out.println(lenMax);\n+ in.close();\n }\n }", "output": "FASTER 0.1022", "pair_id": "java_3828_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.0734} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n- int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n- x -= a;\n- while (b <= x) {\n- x -= b;\n- }\n- System.out.println(x);\n+ int x = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+\n+ System.out.println((x - a) % b);\n }\n }", "output": "SLOWER 0.0571", "pair_id": "java_6637_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0404} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.HashMap;\n-import java.util.Random;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n-\n- int N = scanner.nextInt();\n- char[] s = scanner.next().toCharArray();\n- int[] M = {999_999_937, 1_000_000_007};\n- int B = new Random().nextInt(999_999_937);\n- int left = 0;\n- int right = N / 2 + 1;\n- while (right - left > 1) {\n- int mid = (left + right) / 2;\n- if (possible(s, mid, N, B, M)) left = mid;\n- else right = mid;\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ String S = sc.next();\n+ sc.close();\n+ int r = -1;\n+ String s = \"\";\n+ long ans = 0;\n+ for (int l = 0; l < N; l++) {\n+ while (l - 1 > r) {\n+ r++;\n+ }\n+ while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n+ s += S.charAt(r + 1);\n+ r++;\n+ }\n+ ans = Math.max(r - l + 1, ans);\n+ if (s.length() >= 2) s = s.substring(1);\n+ else if (s.length() == 1) s = \"\";\n }\n- System.out.println(left);\n- }\n-\n- private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n- long[] bn = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- bn[i] = 1;\n- for (int j = 0; j < K - 1; j++) {\n- bn[i] *= B;\n- bn[i] %= M[i];\n- }\n- }\n-\n- HashMap occurrences = new HashMap<>();\n- long[] hash = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- hash[i] = hash(s, K, B, M[i]);\n- }\n- occurrences.put(new Tuple(hash), 0);\n- for (int i = 1; i <= N - K; i++) {\n- for (int j = 0; j < M.length; j++) {\n- hash[j] -= s[i - 1] * bn[j] % M[j];\n- if (hash[j] < 0) hash[j] += M[j];\n- hash[j] *= B;\n- hash[j] %= M[j];\n- hash[j] += s[i + K - 1];\n- if (hash[j] >= M[j]) hash[j] -= M[j];\n- }\n- Tuple key = new Tuple(hash);\n- if (occurrences.containsKey(key)) {\n- if (occurrences.get(key) + K <= i) return true;\n- } else occurrences.put(key, i);\n- }\n- return false;\n- }\n-\n- private static long hash(char[] s, int len, int B, int M) {\n- if (s.length < len)\n- throw new IllegalArgumentException(\n- \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n- long hash = 0;\n- for (int i = 0; i < len; i++) {\n- hash *= B;\n- hash %= M;\n- hash += s[i];\n- if (hash >= M) hash -= M;\n- }\n- return hash;\n- }\n-\n- private static class Tuple {\n- private final long[] elements;\n-\n- private Tuple(long[] elements) {\n- this.elements = Arrays.copyOf(elements, elements.length);\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Tuple tuple = (Tuple) o;\n- return Arrays.equals(elements, tuple.elements);\n- }\n-\n- @Override\n- public int hashCode() {\n- return Arrays.hashCode(elements);\n- }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.3033", "pair_id": "java_3836_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.234} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n HashMap map = new HashMap();\n for (int i = 0; i < n; i++) {\n String s = sc.next().replace(\"*\", \".\");\n int price = sc.nextInt();\n map.put(s, price);\n }\n\n int ans = 0;\n for (int i = 0; i < m; i++) {\n String x = sc.next();\n for (String s : map.keySet()) {\n if (x.matches(s)) {\n ans += map.get(s);\n break;\n }\n }\n }\n\n System.out.println(ans);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] z) {\n Scanner s = new Scanner(System.in);\n for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n m = s.nextInt();\n Map a = new HashMap();\n for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n for (r = 0; m-- > 0; ) {\n String x = s.next();\n for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- while (true) {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- if (n == 0 && m == 0) break;\n-\n- HashMap map = new HashMap();\n- for (int i = 0; i < n; i++) {\n- String s = sc.next().replace(\"*\", \".\");\n- int price = sc.nextInt();\n- map.put(s, price);\n+class Main {\n+ public static void main(String[] z) {\n+ Scanner s = new Scanner(System.in);\n+ for (int n, m, r; (n = s.nextInt()) > 0; System.out.println(r)) {\n+ m = s.nextInt();\n+ Map a = new HashMap();\n+ for (; n-- > 0; ) a.put(s.next().replaceAll(\"\\\\*\", \"\"), s.nextLong());\n+ for (r = 0; m-- > 0; ) {\n+ String x = s.next();\n+ for (String y : a.keySet()) if (x.matches(\".*\" + y + \"$\")) r += a.get(y);\n }\n-\n- int ans = 0;\n- for (int i = 0; i < m; i++) {\n- String x = sc.next();\n- for (String s : map.keySet()) {\n- if (x.matches(s)) {\n- ans += map.get(s);\n- break;\n- }\n- }\n- }\n-\n- System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.2218", "pair_id": "java_1006_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 1.1662} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n }\n \n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n }\n \n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n }\n \n- public void close() throws IOException {\n- bw.close();\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n \n for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n+\n for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n- System.out.println(\"NO\");\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n+ }\n+\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ }\n+ return false;\n }\n }", "output": "SLOWER 0.9765", "pair_id": "java_4714_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.9677} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.IOException;\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n }\n- System.out.println(sum);\n+ }\n+\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.2162", "pair_id": "java_191_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.1617} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class A5 {\n+public class TaskC {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextLong();\n- int x = in.nextInt();\n- int[] a = new int[] {0, 0, 0};\n- a[x] = 1;\n- n %= 6;\n-\n- for (long i = n; i > 0; --i) {\n- if (i % 2 == 1) {\n- int t = a[0];\n- a[0] = a[1];\n- a[1] = t;\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int[] arr = {0, 0, 0};\n+ int x = sc.nextInt();\n+ arr[x] = 1;\n+ int i = 0;\n+ for (i = n; i > 0 && arr[1] != 1; i--) {\n+ if (i % 2 == 0) {\n+ int t = arr[1];\n+ arr[1] = arr[2];\n+ arr[2] = t;\n } else {\n- int t = a[1];\n- a[1] = a[2];\n- a[2] = t;\n+ int t = arr[0];\n+ arr[0] = arr[1];\n+ arr[1] = t;\n }\n }\n- System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n+ if (i == 0) {\n+ for (int j = 0; j < 3; j++) {\n+ if (arr[j] == 1) {\n+ System.out.println(j);\n+ break;\n+ }\n+ }\n+ } else {\n+ if (i % 2 == 0) {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(2);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(0);\n+ }\n+ } else {\n+ if (i % 6 <= 2 && i % 6 > 0) {\n+ System.out.println(0);\n+ } else if (i % 6 == 3 || i % 6 == 0) {\n+ System.out.println(1);\n+ } else {\n+ System.out.println(2);\n+ }\n+ }\n+ }\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.0446", "pair_id": "java_416_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0314} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.File;\n-import java.io.FileReader;\n-import java.io.FileWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.util.Locale;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class ER49B {\n- static StringTokenizer st;\n- static BufferedReader br;\n- static PrintWriter pw;\n-\n- static class sort implements Comparable {\n- int a, b, c;\n-\n- public sort(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n-\n- public int compareTo(sort arg0) {\n- if (this.c == arg0.c) return 0;\n- else if (this.c > arg0.c) return 1;\n- else return -1;\n- }\n- }\n-\n- public static void main(String[] args) throws IOException {\n- Locale.setDefault(Locale.US);\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n-\n- long n = nextLong();\n- int q = nextInt();\n-\n- for (int i = 0; i < q; i++) {\n- long xi = nextLong(), yi = nextLong();\n- long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n- if (n % 2 == 1) {\n- ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n- if ((xi + yi) % 2 == 0) {\n- ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n- }\n- }\n-\n- if ((xi + yi) % 2 == 1) {\n- ans += (n * n + 1) / 2;\n- }\n- pw.println(ans);\n- }\n-\n- pw.close();\n- }\n-\n- private static void gfile() throws IOException {\n- br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n- pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n- }\n-\n- private static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- private static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- private static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- private static String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ pw.flush();\n }\n }", "output": "SLOWER 1.1438", "pair_id": "java_5760_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.2096} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- long n = Integer.parseInt(st.nextToken());\n- int q = Integer.parseInt(st.nextToken());\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- while (q-- != 0) {\n- st = new StringTokenizer(br.readLine());\n- long r = Integer.parseInt(st.nextToken()) - 1;\n- long c = Integer.parseInt(st.nextToken()) - 1;\n- long offset = 0;\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n \n- if ((r + c) % 2 == 1) {\n- offset = (n * n + 1) / 2;\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n+ }\n }\n \n- long cell = r * n + c;\n- System.out.println(cell / 2 + offset + 1);\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n+\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n+\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n+ }\n+\n+ q--;\n }\n }\n }", "output": "FASTER 0.5231", "pair_id": "java_5784_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.437} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.util.*;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class B {\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ static long N;\n \n- System.out.println(solve(x, y, n));\n+ public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n+\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n+ } else {\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n+ }\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n+\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n+ }\n+\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ }\n+\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n+ return (char) buf[bId++];\n+ }\n \n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n+ }\n+\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n }\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.6296", "pair_id": "java_5796_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5471} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n+public class helloWorld {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n- }\n- System.out.println(sum);\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n+\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n+\n+ System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "SLOWER 0.1076", "pair_id": "java_187_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0774} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.HashMap;\n-import java.util.Random;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n-\n- int N = scanner.nextInt();\n- char[] s = scanner.next().toCharArray();\n- int[] M = {999_999_937, 1_000_000_007};\n- int B = new Random().nextInt(999_999_937);\n- int left = 0;\n- int right = N / 2 + 1;\n- while (right - left > 1) {\n- int mid = (left + right) / 2;\n- if (possible(s, mid, N, B, M)) left = mid;\n- else right = mid;\n- }\n- System.out.println(left);\n- }\n-\n- private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n- long[] bn = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- bn[i] = 1;\n- for (int j = 0; j < K - 1; j++) {\n- bn[i] *= B;\n- bn[i] %= M[i];\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ String s = sc.next();\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ for (int j = i + max + 1; j < n; j++) {\n+ if (0 < s.indexOf(s.substring(i, j), j)) {\n+ max = j - i;\n+ } else {\n+ break;\n+ }\n }\n }\n-\n- HashMap occurrences = new HashMap<>();\n- long[] hash = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- hash[i] = hash(s, K, B, M[i]);\n- }\n- occurrences.put(new Tuple(hash), 0);\n- for (int i = 1; i <= N - K; i++) {\n- for (int j = 0; j < M.length; j++) {\n- hash[j] -= s[i - 1] * bn[j] % M[j];\n- if (hash[j] < 0) hash[j] += M[j];\n- hash[j] *= B;\n- hash[j] %= M[j];\n- hash[j] += s[i + K - 1];\n- if (hash[j] >= M[j]) hash[j] -= M[j];\n- }\n- Tuple key = new Tuple(hash);\n- if (occurrences.containsKey(key)) {\n- if (occurrences.get(key) + K <= i) return true;\n- } else occurrences.put(key, i);\n- }\n- return false;\n- }\n-\n- private static long hash(char[] s, int len, int B, int M) {\n- if (s.length < len)\n- throw new IllegalArgumentException(\n- \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n- long hash = 0;\n- for (int i = 0; i < len; i++) {\n- hash *= B;\n- hash %= M;\n- hash += s[i];\n- if (hash >= M) hash -= M;\n- }\n- return hash;\n- }\n-\n- private static class Tuple {\n- private final long[] elements;\n-\n- private Tuple(long[] elements) {\n- this.elements = Arrays.copyOf(elements, elements.length);\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Tuple tuple = (Tuple) o;\n- return Arrays.equals(elements, tuple.elements);\n- }\n-\n- @Override\n- public int hashCode() {\n- return Arrays.hashCode(elements);\n- }\n+ System.out.println(max);\n+ sc.close();\n }\n }", "output": "FASTER 0.2345", "pair_id": "java_3825_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.1765} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n String s = sc.next();\n int max = 0;\n for (int i = 0; i < n; i++) {\n for (int j = i + max + 1; j < n; j++) {\n if (0 < s.indexOf(s.substring(i, j), j)) {\n max = j - i;\n } else {\n break;\n }\n }\n }\n System.out.println(max);\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.HashMap;\n+import java.util.Random;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- String s = sc.next();\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- for (int j = i + max + 1; j < n; j++) {\n- if (0 < s.indexOf(s.substring(i, j), j)) {\n- max = j - i;\n- } else {\n- break;\n- }\n+ int N = scanner.nextInt();\n+ char[] s = scanner.next().toCharArray();\n+ int[] M = {999_999_937, 1_000_000_007};\n+ int B = new Random().nextInt(999_999_937);\n+ int left = 0;\n+ int right = N / 2 + 1;\n+ while (right - left > 1) {\n+ int mid = (left + right) / 2;\n+ if (possible(s, mid, N, B, M)) left = mid;\n+ else right = mid;\n+ }\n+ System.out.println(left);\n+ }\n+\n+ private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n+ long[] bn = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ bn[i] = 1;\n+ for (int j = 0; j < K - 1; j++) {\n+ bn[i] *= B;\n+ bn[i] %= M[i];\n }\n }\n- System.out.println(max);\n- sc.close();\n+\n+ HashMap occurrences = new HashMap<>();\n+ long[] hash = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ hash[i] = hash(s, K, B, M[i]);\n+ }\n+ occurrences.put(new Tuple(hash), 0);\n+ for (int i = 1; i <= N - K; i++) {\n+ for (int j = 0; j < M.length; j++) {\n+ hash[j] -= s[i - 1] * bn[j] % M[j];\n+ if (hash[j] < 0) hash[j] += M[j];\n+ hash[j] *= B;\n+ hash[j] %= M[j];\n+ hash[j] += s[i + K - 1];\n+ if (hash[j] >= M[j]) hash[j] -= M[j];\n+ }\n+ Tuple key = new Tuple(hash);\n+ if (occurrences.containsKey(key)) {\n+ if (occurrences.get(key) + K <= i) return true;\n+ } else occurrences.put(key, i);\n+ }\n+ return false;\n+ }\n+\n+ private static long hash(char[] s, int len, int B, int M) {\n+ if (s.length < len)\n+ throw new IllegalArgumentException(\n+ \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n+ long hash = 0;\n+ for (int i = 0; i < len; i++) {\n+ hash *= B;\n+ hash %= M;\n+ hash += s[i];\n+ if (hash >= M) hash -= M;\n+ }\n+ return hash;\n+ }\n+\n+ private static class Tuple {\n+ private final long[] elements;\n+\n+ private Tuple(long[] elements) {\n+ this.elements = Arrays.copyOf(elements, elements.length);\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Tuple tuple = (Tuple) o;\n+ return Arrays.equals(elements, tuple.elements);\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return Arrays.hashCode(elements);\n+ }\n }\n }", "output": "SLOWER 0.2345", "pair_id": "java_3825_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.1765} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n public class Main {\n- static class node {\n- int x;\n- int y;\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n }\n \n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n \n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n+ }\n+\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- for (int i = 0; i < 4; i++) a[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n- for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "FASTER 3.3944", "pair_id": "java_4744_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 10.5154} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-public class Test {\n-\n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n-\n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n- }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n- }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n+import java.io.Closeable;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+\n+public class Main {\n+ public static void main(String[] args) throws Exception {\n+ Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n+ thread.start();\n+ thread.join();\n+ }\n+\n+ static class TaskAdapter implements Runnable {\n+ @Override\n+ public void run() {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastInput in = new FastInput(inputStream);\n+ FastOutput out = new FastOutput(outputStream);\n+ ATwoSquares solver = new ATwoSquares();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+ }\n+\n+ static class ATwoSquares {\n+ public void solve(int testNumber, FastInput in, FastOutput out) {\n+ Rect r1 = new Rect();\n+ Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n+ r1.update(in.readInt(), in.readInt());\n+ }\n for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n- }\n- }\n-\n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n- }\n-\n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n+ r2.update(in.readInt(), in.readInt());\n+ }\n+\n+ for (int x = -100; x <= 100; x++) {\n+ for (int y = -100; y <= 100; y++) {\n+ if (contain1(r1, x, y) && contain2(r2, x, y)) {\n+ out.println(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.println(\"NO\");\n+ }\n+\n+ public boolean contain1(Rect rect, int x, int y) {\n+ return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ }\n+\n+ public boolean contain2(Rect rect, int x, int y) {\n+ int cx = (rect.l + rect.r) / 2;\n+ int cy = (rect.b + rect.t) / 2;\n+ int dist = Math.abs(cx - x) + Math.abs(cy - y);\n+ return dist <= cx - rect.l;\n+ }\n+ }\n+\n+ static class FastInput {\n+ private final InputStream is;\n+ private byte[] buf = new byte[1 << 20];\n+ private int bufLen;\n+ private int bufOffset;\n+ private int next;\n+\n+ public FastInput(InputStream is) {\n+ this.is = is;\n+ }\n+\n+ private int read() {\n+ while (bufLen == bufOffset) {\n+ bufOffset = 0;\n+ try {\n+ bufLen = is.read(buf);\n+ } catch (IOException e) {\n+ bufLen = -1;\n+ }\n+ if (bufLen == -1) {\n+ return -1;\n+ }\n+ }\n+ return buf[bufOffset++];\n+ }\n+\n+ public void skipBlank() {\n+ while (next >= 0 && next <= 32) {\n+ next = read();\n+ }\n+ }\n+\n+ public int readInt() {\n+ int sign = 1;\n+\n+ skipBlank();\n+ if (next == '+' || next == '-') {\n+ sign = next == '+' ? 1 : -1;\n+ next = read();\n+ }\n+\n+ int val = 0;\n+ if (sign == 1) {\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 + next - '0';\n+ next = read();\n+ }\n } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n- return false;\n+ while (next >= '0' && next <= '9') {\n+ val = val * 10 - next + '0';\n+ next = read();\n+ }\n+ }\n+\n+ return val;\n+ }\n+ }\n+\n+ static class Rect {\n+ int l = 100;\n+ int r = -100;\n+ int t = -100;\n+ int b = 100;\n+\n+ public void update(int x, int y) {\n+ l = Math.min(l, x);\n+ r = Math.max(r, x);\n+ t = Math.max(t, y);\n+ b = Math.min(b, y);\n+ }\n+ }\n+\n+ static class FastOutput implements AutoCloseable, Closeable, Appendable {\n+ private StringBuilder cache = new StringBuilder(10 << 20);\n+ private final Writer os;\n+\n+ public FastOutput append(CharSequence csq) {\n+ cache.append(csq);\n+ return this;\n+ }\n+\n+ public FastOutput append(CharSequence csq, int start, int end) {\n+ cache.append(csq, start, end);\n+ return this;\n+ }\n+\n+ public FastOutput(Writer os) {\n+ this.os = os;\n+ }\n+\n+ public FastOutput(OutputStream os) {\n+ this(new OutputStreamWriter(os));\n+ }\n+\n+ public FastOutput append(char c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput append(String c) {\n+ cache.append(c);\n+ return this;\n+ }\n+\n+ public FastOutput println(String c) {\n+ return append(c).println();\n+ }\n+\n+ public FastOutput println() {\n+ cache.append(System.lineSeparator());\n+ return this;\n+ }\n+\n+ public FastOutput flush() {\n+ try {\n+ os.append(cache);\n+ os.flush();\n+ cache.setLength(0);\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+\n+ public String toString() {\n+ return cache.toString();\n+ }\n }\n }", "output": "FASTER 2.5828", "pair_id": "java_4748_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 5.9909} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n import java.util.Scanner;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n+public class JavaApplication42 {\n \n public static void main(String[] args) {\n- int n = in.nextInt();\n \n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n+ int sum = 0;\n+ for (int i = 2; i < n; i++) {\n+ sum += 1 * i * (i + 1);\n }\n-\n- out.println(weight);\n-\n- in.close();\n- out.close();\n+ System.out.println(sum);\n }\n }", "output": "FASTER 0.031", "pair_id": "java_208_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0217} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+public class a1140 {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ int i, p = 0, n;\n+ n = in.nextInt();\n+ for (i = n; i > 2; i--) {\n+ p += i * (i - 1);\n }\n- System.out.println(sum);\n+ System.out.println(p);\n }\n }", "output": "SLOWER 0.083", "pair_id": "java_185_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0592} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n-\n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n-\n- long diff = ((N * N) + 1) / 2;\n-\n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n- }\n+public class second {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.4389", "pair_id": "java_5820_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.3556} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.HashMap;\nimport java.util.Map;\nimport java.util.Scanner;\n\npublic class Skulptor2 {\n\n public static void main(String[] args) {\n Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n int n = scan.nextInt();\n\n L2Map map = new L2Map();\n Parallelepiped[] data = new Parallelepiped[n];\n\n for (int i = 0; i < n; i++) {\n int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n Parallelepiped p = new Parallelepiped(i, a, b, c);\n data[i] = p;\n map.put(p);\n }\n\n int maxDiameter = -1;\n int first = -1, second = -1;\n\n for (Parallelepiped p : data) {\n if (p.c > maxDiameter) {\n maxDiameter = p.c;\n first = p.index;\n second = -1;\n }\n\n Parallelepiped p2 = map.get(p);\n if (p2 != null) {\n int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n if (d > maxDiameter) {\n first = p.index;\n second = p2.index;\n maxDiameter = d;\n }\n }\n }\n\n if (second == -1) {\n System.out.println(1);\n System.out.println(first + 1);\n } else {\n System.out.println(2);\n System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n\n static class Parallelepiped {\n final int index;\n final int a, b, c;\n\n Parallelepiped(int index, int a, int b, int c) {\n\n this.index = index;\n\n int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n int m4 = Math.max(m1, m2),\n m5 = Math.min(Math.min(m1, m2), m3),\n m6 = Math.min(Math.min(a, b), c);\n\n this.a = m4;\n this.b = m5;\n this.c = m6;\n }\n }\n\n static class L2Map {\n private Map> map =\n new HashMap>();\n\n void put(Parallelepiped v) {\n\n Map map2 = map.get(v.a);\n if (map2 == null) {\n map2 = new HashMap();\n map.put(v.a, map2);\n }\n\n Parallelepiped[] currentVs = map2.get(v.b);\n if (currentVs == null) {\n currentVs = new Parallelepiped[2];\n currentVs[0] = v;\n map2.put(v.b, currentVs);\n } else {\n if (currentVs[0].c < v.c) {\n currentVs[1] = currentVs[0];\n currentVs[0] = v;\n } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n }\n }\n\n Parallelepiped get(Parallelepiped p) {\n Map map2 = map.get(p.a);\n if (map2 == null) return null;\n Parallelepiped[] values = map2.get(p.b);\n if (values == null) return null;\n if (values[0] == p) return values[1];\n else return values[0];\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.util.HashMap;\n-import java.util.Map;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Skulptor2 {\n+public class Main {\n+ static HashMap map;\n+ static HashMap pos;\n \n- public static void main(String[] args) {\n- Scanner scan = new Scanner(new BufferedInputStream(System.in, 1024 * 128));\n- int n = scan.nextInt();\n-\n- L2Map map = new L2Map();\n- Parallelepiped[] data = new Parallelepiped[n];\n-\n- for (int i = 0; i < n; i++) {\n- int a = scan.nextInt(), b = scan.nextInt(), c = scan.nextInt();\n- Parallelepiped p = new Parallelepiped(i, a, b, c);\n- data[i] = p;\n- map.put(p);\n- }\n-\n- int maxDiameter = -1;\n- int first = -1, second = -1;\n-\n- for (Parallelepiped p : data) {\n- if (p.c > maxDiameter) {\n- maxDiameter = p.c;\n- first = p.index;\n- second = -1;\n+ static void update(long value, int temp, int i) {\n+ if (!map.containsKey(value)) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n+ } else {\n+ int val = map.get(value);\n+ if (temp > val) {\n+ map.put(value, temp);\n+ pos.put(value, i);\n }\n-\n- Parallelepiped p2 = map.get(p);\n- if (p2 != null) {\n- int d = Math.min(Math.min(p.a, p.b), p.c + p2.c);\n- if (d > maxDiameter) {\n- first = p.index;\n- second = p2.index;\n- maxDiameter = d;\n- }\n- }\n- }\n-\n- if (second == -1) {\n- System.out.println(1);\n- System.out.println(first + 1);\n- } else {\n- System.out.println(2);\n- System.out.println((first + 1) + \" \" + (second + 1));\n }\n }\n \n- static class Parallelepiped {\n- final int index;\n- final int a, b, c;\n-\n- Parallelepiped(int index, int a, int b, int c) {\n-\n- this.index = index;\n-\n- int m1 = Math.max(a, b), m2 = Math.max(b, c), m3 = Math.max(a, c);\n- int m4 = Math.max(m1, m2),\n- m5 = Math.min(Math.min(m1, m2), m3),\n- m6 = Math.min(Math.min(a, b), c);\n-\n- this.a = m4;\n- this.b = m5;\n- this.c = m6;\n- }\n+ static int det(long temp) {\n+ if (!map.containsKey(temp)) return 0;\n+ return map.get(temp);\n }\n \n- static class L2Map {\n- private Map> map =\n- new HashMap>();\n-\n- void put(Parallelepiped v) {\n-\n- Map map2 = map.get(v.a);\n- if (map2 == null) {\n- map2 = new HashMap();\n- map.put(v.a, map2);\n+ public static void main(String[] args) throws Exception {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int n = Integer.parseInt(br.readLine());\n+ StringTokenizer st;\n+ map = new HashMap<>();\n+ pos = new HashMap<>();\n+ long mod = (long) 1E9 + 7;\n+ int ans = 0;\n+ int single = -1;\n+ int next = -1;\n+ int postemp = -1;\n+ for (int i = 1; i <= n; i++) {\n+ st = new StringTokenizer(br.readLine());\n+ int a = Integer.parseInt(st.nextToken());\n+ int b = Integer.parseInt(st.nextToken());\n+ int c = Integer.parseInt(st.nextToken());\n+ int min = Math.min(a, Math.min(b, c));\n+ if (ans < min) {\n+ ans = min;\n+ single = i;\n+ next = -1;\n }\n-\n- Parallelepiped[] currentVs = map2.get(v.b);\n- if (currentVs == null) {\n- currentVs = new Parallelepiped[2];\n- currentVs[0] = v;\n- map2.put(v.b, currentVs);\n- } else {\n- if (currentVs[0].c < v.c) {\n- currentVs[1] = currentVs[0];\n- currentVs[0] = v;\n- } else if (currentVs[1] == null || currentVs[1].c < v.c) currentVs[1] = v;\n+ int val = det(Math.min(a, b) * mod + Math.max(a, b));\n+ if (val > 0) {\n+ postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n+ val = Math.min(a, Math.min(b, val + c));\n+ if (ans < val) {\n+ ans = val;\n+ single = i;\n+ next = postemp;\n+ }\n }\n+ int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n+ if (val1 > 0) {\n+ postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n+ val1 = Math.min(a, Math.min(c, b + val1));\n+ if (ans < val1) {\n+ ans = val1;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n+ if (val2 > 0) {\n+ postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n+ val2 = Math.min(b, Math.min(c, a + val2));\n+ if (ans < val2) {\n+ ans = val2;\n+ single = i;\n+ next = postemp;\n+ }\n+ }\n+ update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n+ update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n+ update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n-\n- Parallelepiped get(Parallelepiped p) {\n- Map map2 = map.get(p.a);\n- if (map2 == null) return null;\n- Parallelepiped[] values = map2.get(p.b);\n- if (values == null) return null;\n- if (values[0] == p) return values[1];\n- else return values[0];\n+ if (next == -1) {\n+ System.out.println(\"1\");\n+ System.out.println(single);\n+ return;\n }\n+ System.out.println(\"2\");\n+ System.out.println(single + \" \" + next);\n }\n }", "output": "SLOWER 1.3795", "pair_id": "java_9717_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 2.6017} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n import java.util.*;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n- }\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 1.005", "pair_id": "java_4755_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 2.0069} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n UnionFindTree t = new UnionFindTree(n);\n\n for (int i = 0; i < m; i++) {\n t.unite(sc.nextInt() - 1, sc.nextInt() - 1);\n sc.nextInt();\n }\n\n System.out.println(t.total());\n }\n}\n\nclass UnionFindTree {\n int[] par;\n int[] rank;\n int[] peers;\n\n public UnionFindTree(int n) {\n par = new int[n];\n rank = new int[n];\n peers = new int[n];\n\n for (int i = 0; i < n; i++) {\n par[i] = i;\n peers[i] = 1;\n }\n }\n\n int find(int x) {\n if (par[x] == x) {\n return x;\n } else {\n return par[x] = find(par[x]);\n }\n }\n\n void unite(int x, int y) {\n int px = find(x);\n int py = find(y);\n\n if (px == py) {\n return;\n } else if (rank[px] < rank[py]) {\n peers[py] += peers[px];\n par[px] = py;\n\n } else {\n peers[px] += peers[py];\n par[py] = px;\n if (rank[px] == rank[py]) {\n rank[px]++;\n }\n }\n }\n\n boolean isEquivalent(int x, int y) {\n return find(x) == find(y);\n }\n\n int peersnum(int x) {\n return peers[find(x)];\n }\n\n int total() {\n boolean[] iss = new boolean[par.length];\n int sum = 0;\n for (int i = 0; i < par.length; i++) {\n int mo = find(i);\n if (iss[mo]) {\n\n } else {\n iss[mo] = true;\n sum += 1;\n }\n }\n return sum;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\nimport java.nio.charset.Charset;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n LightScanner in = new LightScanner(inputStream);\n LightWriter out = new LightWriter(outputStream);\n E1Or2 solver = new E1Or2();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class E1Or2 {\n public void solve(int testNumber, LightScanner in, LightWriter out) {\n\n int n = in.ints(), m = in.ints();\n IntUnionFind uf = new IntUnionFind(n);\n for (int i = 0; i < m; i++) {\n int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n uf.union(x, y);\n }\n out.ans(uf.size()).ln();\n }\n }\n\n static class LightScanner {\n private BufferedReader reader = null;\n private StringTokenizer tokenizer = null;\n\n public LightScanner(InputStream in) {\n reader = new BufferedReader(new InputStreamReader(in));\n }\n\n public String string() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int ints() {\n return Integer.parseInt(string());\n }\n }\n\n static final class IntUnionFind {\n private int groups;\n private final int[] nodes;\n private final int[] rank;\n\n public IntUnionFind(int n) {\n groups = n;\n nodes = new int[n];\n Arrays.fill(nodes, -1);\n rank = new int[n];\n }\n\n public int find(int i) {\n int ans = nodes[i];\n if (ans < 0) {\n return i;\n } else {\n return nodes[i] = find(ans);\n }\n }\n\n public int size() {\n return groups;\n }\n\n public boolean union(int x, int y) {\n x = find(x);\n y = find(y);\n if (x == y) {\n return false;\n } else if (rank[x] < rank[y]) {\n nodes[y] += nodes[x];\n nodes[x] = y;\n } else if (rank[x] == rank[y]) {\n rank[x]++;\n nodes[x] += nodes[y];\n nodes[y] = x;\n } else {\n nodes[x] += nodes[y];\n nodes[y] = x;\n }\n groups--;\n return true;\n }\n }\n\n static class LightWriter implements AutoCloseable {\n private final Writer out;\n private boolean autoflush = false;\n private boolean breaked = true;\n\n public LightWriter(Writer out) {\n this.out = out;\n }\n\n public LightWriter(OutputStream out) {\n this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n }\n\n public LightWriter print(char c) {\n try {\n out.write(c);\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter print(String s) {\n try {\n out.write(s, 0, s.length());\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter ans(String s) {\n if (!breaked) {\n print(' ');\n }\n return print(s);\n }\n\n public LightWriter ans(int i) {\n return ans(Integer.toString(i));\n }\n\n public LightWriter ln() {\n print(System.lineSeparator());\n breaked = true;\n if (autoflush) {\n try {\n out.flush();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n return this;\n }\n\n public void close() {\n try {\n out.close();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n import java.io.InputStream;\n-import java.util.*;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.UncheckedIOException;\n+import java.io.Writer;\n+import java.nio.charset.Charset;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ LightScanner in = new LightScanner(inputStream);\n+ LightWriter out = new LightWriter(outputStream);\n+ E1Or2 solver = new E1Or2();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n+ static class E1Or2 {\n+ public void solve(int testNumber, LightScanner in, LightWriter out) {\n \n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- UnionFindTree t = new UnionFindTree(n);\n-\n- for (int i = 0; i < m; i++) {\n- t.unite(sc.nextInt() - 1, sc.nextInt() - 1);\n- sc.nextInt();\n- }\n-\n- System.out.println(t.total());\n- }\n-}\n-\n-class UnionFindTree {\n- int[] par;\n- int[] rank;\n- int[] peers;\n-\n- public UnionFindTree(int n) {\n- par = new int[n];\n- rank = new int[n];\n- peers = new int[n];\n-\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- peers[i] = 1;\n+ int n = in.ints(), m = in.ints();\n+ IntUnionFind uf = new IntUnionFind(n);\n+ for (int i = 0; i < m; i++) {\n+ int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n+ uf.union(x, y);\n+ }\n+ out.ans(uf.size()).ln();\n }\n }\n \n- int find(int x) {\n- if (par[x] == x) {\n- return x;\n- } else {\n- return par[x] = find(par[x]);\n+ static class LightScanner {\n+ private BufferedReader reader = null;\n+ private StringTokenizer tokenizer = null;\n+\n+ public LightScanner(InputStream in) {\n+ reader = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ public String string() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new UncheckedIOException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int ints() {\n+ return Integer.parseInt(string());\n }\n }\n \n- void unite(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n+ static final class IntUnionFind {\n+ private int groups;\n+ private final int[] nodes;\n+ private final int[] rank;\n \n- if (px == py) {\n- return;\n- } else if (rank[px] < rank[py]) {\n- peers[py] += peers[px];\n- par[px] = py;\n+ public IntUnionFind(int n) {\n+ groups = n;\n+ nodes = new int[n];\n+ Arrays.fill(nodes, -1);\n+ rank = new int[n];\n+ }\n \n- } else {\n- peers[px] += peers[py];\n- par[py] = px;\n- if (rank[px] == rank[py]) {\n- rank[px]++;\n+ public int find(int i) {\n+ int ans = nodes[i];\n+ if (ans < 0) {\n+ return i;\n+ } else {\n+ return nodes[i] = find(ans);\n+ }\n+ }\n+\n+ public int size() {\n+ return groups;\n+ }\n+\n+ public boolean union(int x, int y) {\n+ x = find(x);\n+ y = find(y);\n+ if (x == y) {\n+ return false;\n+ } else if (rank[x] < rank[y]) {\n+ nodes[y] += nodes[x];\n+ nodes[x] = y;\n+ } else if (rank[x] == rank[y]) {\n+ rank[x]++;\n+ nodes[x] += nodes[y];\n+ nodes[y] = x;\n+ } else {\n+ nodes[x] += nodes[y];\n+ nodes[y] = x;\n+ }\n+ groups--;\n+ return true;\n+ }\n+ }\n+\n+ static class LightWriter implements AutoCloseable {\n+ private final Writer out;\n+ private boolean autoflush = false;\n+ private boolean breaked = true;\n+\n+ public LightWriter(Writer out) {\n+ this.out = out;\n+ }\n+\n+ public LightWriter(OutputStream out) {\n+ this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n+ }\n+\n+ public LightWriter print(char c) {\n+ try {\n+ out.write(c);\n+ breaked = false;\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ return this;\n+ }\n+\n+ public LightWriter print(String s) {\n+ try {\n+ out.write(s, 0, s.length());\n+ breaked = false;\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ return this;\n+ }\n+\n+ public LightWriter ans(String s) {\n+ if (!breaked) {\n+ print(' ');\n+ }\n+ return print(s);\n+ }\n+\n+ public LightWriter ans(int i) {\n+ return ans(Integer.toString(i));\n+ }\n+\n+ public LightWriter ln() {\n+ print(System.lineSeparator());\n+ breaked = true;\n+ if (autoflush) {\n+ try {\n+ out.flush();\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n+ }\n+ }\n+ return this;\n+ }\n+\n+ public void close() {\n+ try {\n+ out.close();\n+ } catch (IOException ex) {\n+ throw new UncheckedIOException(ex);\n }\n }\n }\n-\n- boolean isEquivalent(int x, int y) {\n- return find(x) == find(y);\n- }\n-\n- int peersnum(int x) {\n- return peers[find(x)];\n- }\n-\n- int total() {\n- boolean[] iss = new boolean[par.length];\n- int sum = 0;\n- for (int i = 0; i < par.length; i++) {\n- int mo = find(i);\n- if (iss[mo]) {\n-\n- } else {\n- iss[mo] = true;\n- sum += 1;\n- }\n- }\n- return sum;\n- }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 3.2783", "pair_id": "java_12875_reversed", "problem_id": "p03045", "language": "java", "direction": "reversed", "speedup_ratio": 9.7018} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.lang.reflect.Constructor;\nimport java.util.ArrayDeque;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collection;\nimport java.util.InputMismatchException;\nimport java.util.Iterator;\nimport java.util.LinkedList;\nimport java.util.StringTokenizer;\n\npublic class CodeB {\n private static final boolean SHOULD_BUFFER_OUTPUT = false;\n\n static final SuperWriter sw = new SuperWriter(System.out);\n\n static final SuperScanner sc = new SuperScanner();\n\n static Node[] nodes;\n\n static class Answer implements Comparable {\n final int[] nodes;\n final int cost;\n\n Answer(int a, int b, int cost) {\n this.nodes = new int[] {a, b};\n this.cost = cost;\n }\n\n public Answer(Answer other, int id, int addedCost) {\n this.nodes = new int[other.nodes.length + 1];\n this.nodes[0] = id;\n for (int i = 0; i < other.nodes.length; i++) {\n this.nodes[i + 1] = other.nodes[i];\n }\n this.cost = other.cost + addedCost;\n }\n\n boolean contains(int id) {\n for (int i : nodes) {\n if (i == id) {\n return true;\n }\n }\n return false;\n }\n\n @Override\n public int compareTo(Answer o) {\n return o.cost - cost;\n }\n }\n\n static Answer[] tmpSort;\n\n static Answer[] getN(ArrayList values, int n) {\n Answer[] answer = new Answer[n];\n int currentMinIndex = 0;\n int currentSize = 0;\n for (Answer v : values) {\n if (currentSize != n) {\n answer[currentSize++] = v;\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n } else {\n if (v.cost > answer[currentMinIndex].cost) {\n answer[currentMinIndex] = v;\n }\n int min = Integer.MAX_VALUE;\n for (int i = 0; i < n; i++) {\n if (answer[i] != null && answer[i].cost < min) {\n currentMinIndex = i;\n min = answer[i].cost;\n }\n }\n }\n }\n Arrays.sort(answer);\n return answer;\n }\n\n static class Node {\n final ArrayList edges = new ArrayList<>();\n final int id;\n int visitedCost;\n int[] costs;\n Answer[] first;\n Answer[] second;\n\n Node(int id) {\n this.id = id;\n }\n\n Answer[] getFirst() {\n if (first != null) {\n return first;\n }\n ArrayList firstTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n firstTmp.add(new Answer(id, i, cost));\n }\n first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n return first;\n }\n\n Answer[] getSecond() {\n if (second != null) {\n return second;\n }\n LinkedList missing = new LinkedList<>();\n for (int i = 0; i < nodes.length; i++) {\n if (i != id) {\n missing.add(i);\n }\n }\n ArrayList secondTmp = new ArrayList<>();\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n for (Answer answer : nodes[i].getFirst()) {\n if (!answer.contains(id)) {\n secondTmp.add(new Answer(answer, id, cost));\n }\n }\n }\n Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n ArrayList relevants = new ArrayList<>();\n for (Answer answer : secondTmp2) {\n if (missing.isEmpty()) {\n break;\n }\n boolean relevant = false;\n Iterator it = missing.iterator();\n while (it.hasNext()) {\n int next = it.next();\n if (!answer.contains(next)) {\n it.remove();\n relevant = true;\n }\n }\n if (relevant) {\n relevants.add(answer);\n }\n }\n return second = relevants.toArray(new Answer[0]);\n }\n\n Answer getSolution(int first, int cost) {\n for (Answer answer : getSecond()) {\n if (!answer.contains(first)) {\n return new Answer(answer, first, cost);\n }\n }\n return null;\n }\n\n Answer getSolution() {\n Answer best = null;\n for (int i = 0; i < costs.length; i++) {\n int cost = costs[i];\n if ((i == id) || (cost == Integer.MAX_VALUE)) {\n continue;\n }\n Answer possible = nodes[i].getSolution(id, cost);\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n return best;\n }\n }\n\n static int[] getCosts(Node[] nodes, int fromNode) {\n for (Node node : nodes) {\n node.visitedCost = Integer.MAX_VALUE;\n }\n int[] answer = new int[nodes.length];\n Arrays.fill(answer, Integer.MAX_VALUE);\n answer[fromNode] = 0;\n nodes[fromNode].visitedCost = 0;\n ArrayDeque queue = new ArrayDeque<>();\n queue.add(nodes[fromNode]);\n while (!queue.isEmpty()) {\n Node current = queue.pollFirst();\n for (Node edge : current.edges) {\n if (edge.visitedCost != Integer.MAX_VALUE) {\n continue;\n }\n answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n queue.add(edge);\n }\n }\n return answer;\n }\n\n public static void main() {\n int n = sc.nextInt();\n int m = sc.nextInt();\n nodes = new Node[n];\n tmpSort = new Answer[4 * (m + 1)];\n for (int i = 0; i < n; i++) {\n nodes[i] = new Node(i);\n }\n for (int i = 0; i < m; i++) {\n int u = sc.nextInt() - 1;\n int v = sc.nextInt() - 1;\n nodes[u].edges.add(nodes[v]);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n for (int i = 0; i < n; i++) {\n nodes[i].costs = getCosts(nodes, i);\n }\n Answer best = null;\n for (int i = 0; i < n; i++) {\n Answer possible = nodes[i].getSolution();\n if (possible != null) {\n if (best == null || possible.cost > best.cost) {\n best = possible;\n }\n }\n }\n for (int i = 0; i < 4; i++) {\n best.nodes[i]++;\n }\n sw.printLine(best.nodes);\n }\n\n static class LineScanner extends Scanner {\n private StringTokenizer st;\n\n public LineScanner(String input) {\n st = new StringTokenizer(input);\n }\n\n @Override\n public String next() {\n return st.hasMoreTokens() ? st.nextToken() : null;\n }\n\n @Override\n public String nextLine() {\n throw new RuntimeException(\"not supported\");\n }\n\n public boolean hasNext() {\n return st.hasMoreTokens();\n }\n\n private final ArrayList temp = new ArrayList();\n\n private void fillTemp() {\n while (st.hasMoreTokens()) {\n temp.add(st.nextToken());\n }\n }\n\n public String[] asStringArray() {\n fillTemp();\n String[] answer = new String[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = (String) temp.get(i);\n }\n temp.clear();\n return answer;\n }\n\n public int[] asIntArray() {\n fillTemp();\n int[] answer = new int[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Integer.parseInt((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public long[] asLongArray() {\n fillTemp();\n long[] answer = new long[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Long.parseLong((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n\n public double[] asDoubleArray() {\n fillTemp();\n double[] answer = new double[temp.size()];\n for (int i = 0; i < answer.length; i++) {\n answer[i] = Double.parseDouble((String) temp.get(i));\n }\n temp.clear();\n return answer;\n }\n }\n\n static class SuperScanner extends Scanner {\n private InputStream stream;\n private byte[] buf = new byte[8096];\n private int curChar;\n private int numChars;\n\n public SuperScanner() {\n this.stream = System.in;\n }\n\n public int read() {\n if (numChars == -1) return -1;\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public static boolean isWhitespace(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n public static boolean isLineEnd(int c) {\n return c == '\\n' || c == -1;\n }\n\n private final StringBuilder sb = new StringBuilder();\n\n @Override\n public String next() {\n int c = read();\n while (isWhitespace(c)) {\n if (c == -1) {\n return null;\n }\n c = read();\n }\n sb.setLength(0);\n do {\n sb.append((char) c);\n c = read();\n } while (!isWhitespace(c));\n return sb.toString();\n }\n\n @Override\n public String nextLine() {\n sb.setLength(0);\n int c;\n while (true) {\n c = read();\n if (!isLineEnd(c)) {\n sb.append((char) c);\n } else {\n break;\n }\n }\n if (c == -1 && sb.length() == 0) {\n return null;\n } else {\n if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n return sb.substring(0, sb.length() - 1);\n } else {\n return sb.toString();\n }\n }\n }\n\n public LineScanner nextLineScanner() {\n String line = nextLine();\n if (line == null) {\n return null;\n } else {\n return new LineScanner(line);\n }\n }\n\n public LineScanner nextNonEmptyLineScanner() {\n while (true) {\n String line = nextLine();\n if (line == null) {\n return null;\n } else if (!line.isEmpty()) {\n return new LineScanner(line);\n }\n }\n }\n\n @Override\n public int nextInt() {\n int c = read();\n while (isWhitespace(c)) {\n c = read();\n }\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n\n @Override\n public long nextLong() {\n int c = read();\n while (isWhitespace(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n long res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res = (res << 3) + (res << 1);\n res += c - '0';\n c = read();\n } while (!isWhitespace(c));\n return res * sgn;\n }\n }\n\n abstract static class Scanner {\n\n public abstract String next();\n\n public abstract String nextLine();\n\n public int nextIntOrQuit() {\n Integer n = nextInteger();\n if (n == null) {\n sw.close();\n System.exit(0);\n }\n return n.intValue();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public int[] nextIntArray(int n) {\n int[] res = new int[n];\n for (int i = 0; i < res.length; i++) res[i] = nextInt();\n return res;\n }\n\n public long[] nextLongArray(int n) {\n long[] res = new long[n];\n for (int i = 0; i < res.length; i++) res[i] = nextLong();\n return res;\n }\n\n public double[] nextDoubleArray(int n) {\n double[] res = new double[n];\n for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n return res;\n }\n\n public void sortIntArray(int[] array) {\n Integer[] vals = new Integer[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortLongArray(long[] array) {\n Long[] vals = new Long[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public void sortDoubleArray(double[] array) {\n Double[] vals = new Double[array.length];\n for (int i = 0; i < array.length; i++) vals[i] = array[i];\n Arrays.sort(vals);\n for (int i = 0; i < array.length; i++) array[i] = vals[i];\n }\n\n public String[] nextStringArray(int n) {\n String[] vals = new String[n];\n for (int i = 0; i < n; i++) vals[i] = next();\n return vals;\n }\n\n public Integer nextInteger() {\n String s = next();\n if (s == null) return null;\n return Integer.parseInt(s);\n }\n\n public int[][] nextIntMatrix(int n, int m) {\n int[][] ans = new int[n][];\n for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n return ans;\n }\n\n public char[][] nextGrid(int r) {\n char[][] grid = new char[r][];\n for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n return grid;\n }\n\n public static T fill(T arreglo, int val) {\n if (arreglo instanceof Object[]) {\n Object[] a = (Object[]) arreglo;\n for (Object x : a) fill(x, val);\n } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n return arreglo;\n }\n\n public T[] nextObjectArray(Class clazz, int size) {\n @SuppressWarnings(\"unchecked\")\n T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n for (int c = 0; c < 3; c++) {\n Constructor constructor;\n try {\n if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n else constructor = clazz.getDeclaredConstructor();\n } catch (Exception e) {\n continue;\n }\n try {\n for (int i = 0; i < result.length; i++) {\n if (c == 0) result[i] = constructor.newInstance(this, i);\n else if (c == 1) result[i] = constructor.newInstance(this);\n else result[i] = constructor.newInstance();\n }\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n return result;\n }\n throw new RuntimeException(\"Constructor not found\");\n }\n\n public Collection wrap(int[] as) {\n ArrayList ans = new ArrayList();\n for (int i : as) ans.add(i);\n return ans;\n }\n\n public int[] unwrap(Collection collection) {\n int[] vals = new int[collection.size()];\n int index = 0;\n for (int i : collection) vals[index++] = i;\n return vals;\n }\n\n int testCases = Integer.MIN_VALUE;\n\n boolean testCases() {\n if (testCases == Integer.MIN_VALUE) {\n testCases = nextInt();\n }\n return --testCases >= 0;\n }\n }\n\n static class SuperWriter {\n\n private final PrintWriter writer;\n\n public SuperWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public SuperWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void close() {\n writer.flush();\n writer.close();\n }\n\n public void printLine(String line) {\n writer.println(line);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(long... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n writer.print(vals[0]);\n for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(int prec, double... vals) {\n if (vals.length == 0) {\n writer.println();\n } else {\n String precision = \"%.\" + prec + \"f\";\n writer.print(String.format(precision, vals[0]).replace(',', '.'));\n precision = \" \" + precision;\n for (int i = 1; i < vals.length; i++)\n writer.print(String.format(precision, vals[i]).replace(',', '.'));\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printLine(Collection vals) {\n if (vals.size() == 0) {\n writer.println();\n } else {\n int i = 0;\n for (E val : vals) {\n if (i++ == 0) {\n writer.print(val.toString());\n } else {\n writer.print(\" \".concat(val.toString()));\n }\n }\n writer.println();\n }\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public void printSimple(String value) {\n writer.print(value);\n if (!SHOULD_BUFFER_OUTPUT) {\n writer.flush();\n }\n }\n\n public boolean ifZeroExit(Number... values) {\n for (Number number : values) {\n if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n return false;\n }\n }\n close();\n System.exit(0);\n return true;\n }\n }\n\n public static void main(String[] args) {\n main();\n sw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n City[] cities = new City[n];\n for (int i = 0; i < n; ++i) {\n cities[i] = new City(i);\n }\n for (int i = 0; i < m; ++i) {\n City a = cities[in.nextInt() - 1];\n City b = cities[in.nextInt() - 1];\n a.outgo.add(b);\n }\n int[][] dd = new int[n][n];\n City[] q = new City[n];\n for (int i = 0; i < n; ++i) {\n for (City x : cities) {\n x.dist = -1;\n }\n cities[i].dist = 0;\n int qt = 0;\n int qh = 1;\n q[0] = cities[i];\n while (qt < qh) {\n City cur = q[qt++];\n for (City other : cur.outgo) {\n if (other.dist < 0) {\n other.dist = cur.dist + 1;\n q[qh++] = other;\n }\n }\n }\n for (int j = 0; j < n; ++j) {\n dd[i][j] = cities[j].dist;\n }\n }\n\n int[] first = new int[n];\n int[] next = new int[n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[i][j];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestOut[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n for (int i = 0; i < n; ++i) {\n Arrays.fill(first, -1);\n for (int j = 0; j < n; ++j) {\n int cd = dd[j][i];\n if (cd < 0) continue;\n next[j] = first[cd];\n first[cd] = j;\n }\n int ptr = 0;\n outer:\n for (int cd = n - 1; cd >= 1; --cd) {\n int cur = first[cd];\n while (cur >= 0) {\n cities[i].closestIn[ptr] = cities[cur];\n ++ptr;\n if (ptr == 3) break outer;\n cur = next[cur];\n }\n }\n }\n\n City ra = null;\n City rb = null;\n City rc = null;\n City rd = null;\n int res = 0;\n\n for (City b : cities) {\n b.mark = true;\n for (City c : cities)\n if (!c.mark) {\n int bc = dd[b.index][c.index];\n if (bc < 0) continue;\n c.mark = true;\n for (City a : b.closestIn)\n if (a != null && !a.mark) {\n int ab = dd[a.index][b.index];\n if (ab < 0) continue;\n a.mark = true;\n for (City d : c.closestOut)\n if (d != null && !d.mark) {\n int cd = dd[c.index][d.index];\n if (cd < 0) continue;\n d.mark = true;\n int cur = ab + bc + cd;\n if (cur > res) {\n res = cur;\n ra = a;\n rb = b;\n rc = c;\n rd = d;\n }\n d.mark = false;\n }\n a.mark = false;\n }\n c.mark = false;\n }\n b.mark = false;\n }\n\n out.println(\n (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n\n static class City {\n int index;\n int dist;\n List outgo = new ArrayList<>(1);\n boolean mark = false;\n City[] closestIn = new City[3];\n City[] closestOut = new City[3];\n\n public City(int index) {\n this.index = index;\n }\n }\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A ��� B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n+import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n+import java.io.InputStreamReader;\n import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.lang.reflect.Constructor;\n-import java.util.ArrayDeque;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.Collection;\n-import java.util.InputMismatchException;\n-import java.util.Iterator;\n-import java.util.LinkedList;\n+import java.util.List;\n import java.util.StringTokenizer;\n \n-public class CodeB {\n- private static final boolean SHOULD_BUFFER_OUTPUT = false;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static final SuperWriter sw = new SuperWriter(System.out);\n+ static class TaskB {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ City[] cities = new City[n];\n+ for (int i = 0; i < n; ++i) {\n+ cities[i] = new City(i);\n+ }\n+ for (int i = 0; i < m; ++i) {\n+ City a = cities[in.nextInt() - 1];\n+ City b = cities[in.nextInt() - 1];\n+ a.outgo.add(b);\n+ }\n+ int[][] dd = new int[n][n];\n+ City[] q = new City[n];\n+ for (int i = 0; i < n; ++i) {\n+ for (City x : cities) {\n+ x.dist = -1;\n+ }\n+ cities[i].dist = 0;\n+ int qt = 0;\n+ int qh = 1;\n+ q[0] = cities[i];\n+ while (qt < qh) {\n+ City cur = q[qt++];\n+ for (City other : cur.outgo) {\n+ if (other.dist < 0) {\n+ other.dist = cur.dist + 1;\n+ q[qh++] = other;\n+ }\n+ }\n+ }\n+ for (int j = 0; j < n; ++j) {\n+ dd[i][j] = cities[j].dist;\n+ }\n+ }\n \n- static final SuperScanner sc = new SuperScanner();\n+ int[] first = new int[n];\n+ int[] next = new int[n];\n+ for (int i = 0; i < n; ++i) {\n+ Arrays.fill(first, -1);\n+ for (int j = 0; j < n; ++j) {\n+ int cd = dd[i][j];\n+ if (cd < 0) continue;\n+ next[j] = first[cd];\n+ first[cd] = j;\n+ }\n+ int ptr = 0;\n+ outer:\n+ for (int cd = n - 1; cd >= 1; --cd) {\n+ int cur = first[cd];\n+ while (cur >= 0) {\n+ cities[i].closestOut[ptr] = cities[cur];\n+ ++ptr;\n+ if (ptr == 3) break outer;\n+ cur = next[cur];\n+ }\n+ }\n+ }\n+ for (int i = 0; i < n; ++i) {\n+ Arrays.fill(first, -1);\n+ for (int j = 0; j < n; ++j) {\n+ int cd = dd[j][i];\n+ if (cd < 0) continue;\n+ next[j] = first[cd];\n+ first[cd] = j;\n+ }\n+ int ptr = 0;\n+ outer:\n+ for (int cd = n - 1; cd >= 1; --cd) {\n+ int cur = first[cd];\n+ while (cur >= 0) {\n+ cities[i].closestIn[ptr] = cities[cur];\n+ ++ptr;\n+ if (ptr == 3) break outer;\n+ cur = next[cur];\n+ }\n+ }\n+ }\n \n- static Node[] nodes;\n+ City ra = null;\n+ City rb = null;\n+ City rc = null;\n+ City rd = null;\n+ int res = 0;\n \n- static class Answer implements Comparable {\n- final int[] nodes;\n- final int cost;\n+ for (City b : cities) {\n+ b.mark = true;\n+ for (City c : cities)\n+ if (!c.mark) {\n+ int bc = dd[b.index][c.index];\n+ if (bc < 0) continue;\n+ c.mark = true;\n+ for (City a : b.closestIn)\n+ if (a != null && !a.mark) {\n+ int ab = dd[a.index][b.index];\n+ if (ab < 0) continue;\n+ a.mark = true;\n+ for (City d : c.closestOut)\n+ if (d != null && !d.mark) {\n+ int cd = dd[c.index][d.index];\n+ if (cd < 0) continue;\n+ d.mark = true;\n+ int cur = ab + bc + cd;\n+ if (cur > res) {\n+ res = cur;\n+ ra = a;\n+ rb = b;\n+ rc = c;\n+ rd = d;\n+ }\n+ d.mark = false;\n+ }\n+ a.mark = false;\n+ }\n+ c.mark = false;\n+ }\n+ b.mark = false;\n+ }\n \n- Answer(int a, int b, int cost) {\n- this.nodes = new int[] {a, b};\n- this.cost = cost;\n+ out.println(\n+ (ra.index + 1) + \" \" + (rb.index + 1) + \" \" + (rc.index + 1) + \" \" + (rd.index + 1));\n }\n \n- public Answer(Answer other, int id, int addedCost) {\n- this.nodes = new int[other.nodes.length + 1];\n- this.nodes[0] = id;\n- for (int i = 0; i < other.nodes.length; i++) {\n- this.nodes[i + 1] = other.nodes[i];\n+ static class City {\n+ int index;\n+ int dist;\n+ List outgo = new ArrayList<>(1);\n+ boolean mark = false;\n+ City[] closestIn = new City[3];\n+ City[] closestOut = new City[3];\n+\n+ public City(int index) {\n+ this.index = index;\n }\n- this.cost = other.cost + addedCost;\n- }\n-\n- boolean contains(int id) {\n- for (int i : nodes) {\n- if (i == id) {\n- return true;\n- }\n- }\n- return false;\n- }\n-\n- @Override\n- public int compareTo(Answer o) {\n- return o.cost - cost;\n }\n }\n \n- static Answer[] tmpSort;\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n \n- static Answer[] getN(ArrayList values, int n) {\n- Answer[] answer = new Answer[n];\n- int currentMinIndex = 0;\n- int currentSize = 0;\n- for (Answer v : values) {\n- if (currentSize != n) {\n- answer[currentSize++] = v;\n- int min = Integer.MAX_VALUE;\n- for (int i = 0; i < n; i++) {\n- if (answer[i] != null && answer[i].cost < min) {\n- currentMinIndex = i;\n- min = answer[i].cost;\n- }\n- }\n- } else {\n- if (v.cost > answer[currentMinIndex].cost) {\n- answer[currentMinIndex] = v;\n- }\n- int min = Integer.MAX_VALUE;\n- for (int i = 0; i < n; i++) {\n- if (answer[i] != null && answer[i].cost < min) {\n- currentMinIndex = i;\n- min = answer[i].cost;\n- }\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n }\n }\n- }\n- Arrays.sort(answer);\n- return answer;\n- }\n-\n- static class Node {\n- final ArrayList edges = new ArrayList<>();\n- final int id;\n- int visitedCost;\n- int[] costs;\n- Answer[] first;\n- Answer[] second;\n-\n- Node(int id) {\n- this.id = id;\n- }\n-\n- Answer[] getFirst() {\n- if (first != null) {\n- return first;\n- }\n- ArrayList firstTmp = new ArrayList<>();\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n- }\n- firstTmp.add(new Answer(id, i, cost));\n- }\n- first = getN(firstTmp, Math.min(firstTmp.size(), 3));\n- return first;\n- }\n-\n- Answer[] getSecond() {\n- if (second != null) {\n- return second;\n- }\n- LinkedList missing = new LinkedList<>();\n- for (int i = 0; i < nodes.length; i++) {\n- if (i != id) {\n- missing.add(i);\n- }\n- }\n- ArrayList secondTmp = new ArrayList<>();\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n- }\n- for (Answer answer : nodes[i].getFirst()) {\n- if (!answer.contains(id)) {\n- secondTmp.add(new Answer(answer, id, cost));\n- }\n- }\n- }\n- Answer[] secondTmp2 = getN(secondTmp, Math.min(secondTmp.size(), 4));\n- ArrayList relevants = new ArrayList<>();\n- for (Answer answer : secondTmp2) {\n- if (missing.isEmpty()) {\n- break;\n- }\n- boolean relevant = false;\n- Iterator it = missing.iterator();\n- while (it.hasNext()) {\n- int next = it.next();\n- if (!answer.contains(next)) {\n- it.remove();\n- relevant = true;\n- }\n- }\n- if (relevant) {\n- relevants.add(answer);\n- }\n- }\n- return second = relevants.toArray(new Answer[0]);\n- }\n-\n- Answer getSolution(int first, int cost) {\n- for (Answer answer : getSecond()) {\n- if (!answer.contains(first)) {\n- return new Answer(answer, first, cost);\n- }\n- }\n- return null;\n- }\n-\n- Answer getSolution() {\n- Answer best = null;\n- for (int i = 0; i < costs.length; i++) {\n- int cost = costs[i];\n- if ((i == id) || (cost == Integer.MAX_VALUE)) {\n- continue;\n- }\n- Answer possible = nodes[i].getSolution(id, cost);\n- if (possible != null) {\n- if (best == null || possible.cost > best.cost) {\n- best = possible;\n- }\n- }\n- }\n- return best;\n- }\n- }\n-\n- static int[] getCosts(Node[] nodes, int fromNode) {\n- for (Node node : nodes) {\n- node.visitedCost = Integer.MAX_VALUE;\n- }\n- int[] answer = new int[nodes.length];\n- Arrays.fill(answer, Integer.MAX_VALUE);\n- answer[fromNode] = 0;\n- nodes[fromNode].visitedCost = 0;\n- ArrayDeque queue = new ArrayDeque<>();\n- queue.add(nodes[fromNode]);\n- while (!queue.isEmpty()) {\n- Node current = queue.pollFirst();\n- for (Node edge : current.edges) {\n- if (edge.visitedCost != Integer.MAX_VALUE) {\n- continue;\n- }\n- answer[edge.id] = edge.visitedCost = answer[current.id] + 1;\n- queue.add(edge);\n- }\n- }\n- return answer;\n- }\n-\n- public static void main() {\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- nodes = new Node[n];\n- tmpSort = new Answer[4 * (m + 1)];\n- for (int i = 0; i < n; i++) {\n- nodes[i] = new Node(i);\n- }\n- for (int i = 0; i < m; i++) {\n- int u = sc.nextInt() - 1;\n- int v = sc.nextInt() - 1;\n- nodes[u].edges.add(nodes[v]);\n- }\n- for (int i = 0; i < n; i++) {\n- nodes[i].costs = getCosts(nodes, i);\n- }\n- for (int i = 0; i < n; i++) {\n- nodes[i].costs = getCosts(nodes, i);\n- }\n- Answer best = null;\n- for (int i = 0; i < n; i++) {\n- Answer possible = nodes[i].getSolution();\n- if (possible != null) {\n- if (best == null || possible.cost > best.cost) {\n- best = possible;\n- }\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- best.nodes[i]++;\n- }\n- sw.printLine(best.nodes);\n- }\n-\n- static class LineScanner extends Scanner {\n- private StringTokenizer st;\n-\n- public LineScanner(String input) {\n- st = new StringTokenizer(input);\n- }\n-\n- @Override\n- public String next() {\n- return st.hasMoreTokens() ? st.nextToken() : null;\n- }\n-\n- @Override\n- public String nextLine() {\n- throw new RuntimeException(\"not supported\");\n- }\n-\n- public boolean hasNext() {\n- return st.hasMoreTokens();\n- }\n-\n- private final ArrayList temp = new ArrayList();\n-\n- private void fillTemp() {\n- while (st.hasMoreTokens()) {\n- temp.add(st.nextToken());\n- }\n- }\n-\n- public String[] asStringArray() {\n- fillTemp();\n- String[] answer = new String[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = (String) temp.get(i);\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public int[] asIntArray() {\n- fillTemp();\n- int[] answer = new int[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Integer.parseInt((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public long[] asLongArray() {\n- fillTemp();\n- long[] answer = new long[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Long.parseLong((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n-\n- public double[] asDoubleArray() {\n- fillTemp();\n- double[] answer = new double[temp.size()];\n- for (int i = 0; i < answer.length; i++) {\n- answer[i] = Double.parseDouble((String) temp.get(i));\n- }\n- temp.clear();\n- return answer;\n- }\n- }\n-\n- static class SuperScanner extends Scanner {\n- private InputStream stream;\n- private byte[] buf = new byte[8096];\n- private int curChar;\n- private int numChars;\n-\n- public SuperScanner() {\n- this.stream = System.in;\n- }\n-\n- public int read() {\n- if (numChars == -1) return -1;\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public static boolean isWhitespace(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-\n- public static boolean isLineEnd(int c) {\n- return c == '\\n' || c == -1;\n- }\n-\n- private final StringBuilder sb = new StringBuilder();\n-\n- @Override\n- public String next() {\n- int c = read();\n- while (isWhitespace(c)) {\n- if (c == -1) {\n- return null;\n- }\n- c = read();\n- }\n- sb.setLength(0);\n- do {\n- sb.append((char) c);\n- c = read();\n- } while (!isWhitespace(c));\n- return sb.toString();\n- }\n-\n- @Override\n- public String nextLine() {\n- sb.setLength(0);\n- int c;\n- while (true) {\n- c = read();\n- if (!isLineEnd(c)) {\n- sb.append((char) c);\n- } else {\n- break;\n- }\n- }\n- if (c == -1 && sb.length() == 0) {\n- return null;\n- } else {\n- if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\\r') {\n- return sb.substring(0, sb.length() - 1);\n- } else {\n- return sb.toString();\n- }\n- }\n- }\n-\n- public LineScanner nextLineScanner() {\n- String line = nextLine();\n- if (line == null) {\n- return null;\n- } else {\n- return new LineScanner(line);\n- }\n- }\n-\n- public LineScanner nextNonEmptyLineScanner() {\n- while (true) {\n- String line = nextLine();\n- if (line == null) {\n- return null;\n- } else if (!line.isEmpty()) {\n- return new LineScanner(line);\n- }\n- }\n- }\n-\n- @Override\n- public int nextInt() {\n- int c = read();\n- while (isWhitespace(c)) {\n- c = read();\n- }\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res = (res << 3) + (res << 1);\n- res += c - '0';\n- c = read();\n- } while (!isWhitespace(c));\n- return res * sgn;\n- }\n-\n- @Override\n- public long nextLong() {\n- int c = read();\n- while (isWhitespace(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- long res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res = (res << 3) + (res << 1);\n- res += c - '0';\n- c = read();\n- } while (!isWhitespace(c));\n- return res * sgn;\n- }\n- }\n-\n- abstract static class Scanner {\n-\n- public abstract String next();\n-\n- public abstract String nextLine();\n-\n- public int nextIntOrQuit() {\n- Integer n = nextInteger();\n- if (n == null) {\n- sw.close();\n- System.exit(0);\n- }\n- return n.intValue();\n+ return tokenizer.nextToken();\n }\n \n public int nextInt() {\n return Integer.parseInt(next());\n }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public int[] nextIntArray(int n) {\n- int[] res = new int[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextInt();\n- return res;\n- }\n-\n- public long[] nextLongArray(int n) {\n- long[] res = new long[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextLong();\n- return res;\n- }\n-\n- public double[] nextDoubleArray(int n) {\n- double[] res = new double[n];\n- for (int i = 0; i < res.length; i++) res[i] = nextDouble();\n- return res;\n- }\n-\n- public void sortIntArray(int[] array) {\n- Integer[] vals = new Integer[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public void sortLongArray(long[] array) {\n- Long[] vals = new Long[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public void sortDoubleArray(double[] array) {\n- Double[] vals = new Double[array.length];\n- for (int i = 0; i < array.length; i++) vals[i] = array[i];\n- Arrays.sort(vals);\n- for (int i = 0; i < array.length; i++) array[i] = vals[i];\n- }\n-\n- public String[] nextStringArray(int n) {\n- String[] vals = new String[n];\n- for (int i = 0; i < n; i++) vals[i] = next();\n- return vals;\n- }\n-\n- public Integer nextInteger() {\n- String s = next();\n- if (s == null) return null;\n- return Integer.parseInt(s);\n- }\n-\n- public int[][] nextIntMatrix(int n, int m) {\n- int[][] ans = new int[n][];\n- for (int i = 0; i < n; i++) ans[i] = nextIntArray(m);\n- return ans;\n- }\n-\n- public char[][] nextGrid(int r) {\n- char[][] grid = new char[r][];\n- for (int i = 0; i < r; i++) grid[i] = next().toCharArray();\n- return grid;\n- }\n-\n- public static T fill(T arreglo, int val) {\n- if (arreglo instanceof Object[]) {\n- Object[] a = (Object[]) arreglo;\n- for (Object x : a) fill(x, val);\n- } else if (arreglo instanceof int[]) Arrays.fill((int[]) arreglo, val);\n- else if (arreglo instanceof double[]) Arrays.fill((double[]) arreglo, val);\n- else if (arreglo instanceof long[]) Arrays.fill((long[]) arreglo, val);\n- return arreglo;\n- }\n-\n- public T[] nextObjectArray(Class clazz, int size) {\n- @SuppressWarnings(\"unchecked\")\n- T[] result = (T[]) java.lang.reflect.Array.newInstance(clazz, size);\n- for (int c = 0; c < 3; c++) {\n- Constructor constructor;\n- try {\n- if (c == 0) constructor = clazz.getDeclaredConstructor(Scanner.class, Integer.TYPE);\n- else if (c == 1) constructor = clazz.getDeclaredConstructor(Scanner.class);\n- else constructor = clazz.getDeclaredConstructor();\n- } catch (Exception e) {\n- continue;\n- }\n- try {\n- for (int i = 0; i < result.length; i++) {\n- if (c == 0) result[i] = constructor.newInstance(this, i);\n- else if (c == 1) result[i] = constructor.newInstance(this);\n- else result[i] = constructor.newInstance();\n- }\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n- }\n- return result;\n- }\n- throw new RuntimeException(\"Constructor not found\");\n- }\n-\n- public Collection wrap(int[] as) {\n- ArrayList ans = new ArrayList();\n- for (int i : as) ans.add(i);\n- return ans;\n- }\n-\n- public int[] unwrap(Collection collection) {\n- int[] vals = new int[collection.size()];\n- int index = 0;\n- for (int i : collection) vals[index++] = i;\n- return vals;\n- }\n-\n- int testCases = Integer.MIN_VALUE;\n-\n- boolean testCases() {\n- if (testCases == Integer.MIN_VALUE) {\n- testCases = nextInt();\n- }\n- return --testCases >= 0;\n- }\n- }\n-\n- static class SuperWriter {\n-\n- private final PrintWriter writer;\n-\n- public SuperWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public SuperWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void close() {\n- writer.flush();\n- writer.close();\n- }\n-\n- public void printLine(String line) {\n- writer.println(line);\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(int... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(long... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(double... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- writer.print(vals[0]);\n- for (int i = 1; i < vals.length; i++) writer.print(\" \".concat(String.valueOf(vals[i])));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(int prec, double... vals) {\n- if (vals.length == 0) {\n- writer.println();\n- } else {\n- String precision = \"%.\" + prec + \"f\";\n- writer.print(String.format(precision, vals[0]).replace(',', '.'));\n- precision = \" \" + precision;\n- for (int i = 1; i < vals.length; i++)\n- writer.print(String.format(precision, vals[i]).replace(',', '.'));\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printLine(Collection vals) {\n- if (vals.size() == 0) {\n- writer.println();\n- } else {\n- int i = 0;\n- for (E val : vals) {\n- if (i++ == 0) {\n- writer.print(val.toString());\n- } else {\n- writer.print(\" \".concat(val.toString()));\n- }\n- }\n- writer.println();\n- }\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public void printSimple(String value) {\n- writer.print(value);\n- if (!SHOULD_BUFFER_OUTPUT) {\n- writer.flush();\n- }\n- }\n-\n- public boolean ifZeroExit(Number... values) {\n- for (Number number : values) {\n- if (number.doubleValue() != 0.0d || number.longValue() != 0) {\n- return false;\n- }\n- }\n- close();\n- System.exit(0);\n- return true;\n- }\n- }\n-\n- public static void main(String[] args) {\n- main();\n- sw.close();\n }\n }", "output": "SLOWER 1.3623", "pair_id": "java_6747_reversed", "problem_id": "666_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.5709} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class GFG {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n \n+ System.out.println(solve(x, y, n));\n+ }\n+ }\n+\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ rowSum = sq + ((n * (x - 1)) / 2);\n }\n- pw.println(v2);\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n+\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n+ }\n+ } else {\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n+ }\n+ }\n }\n-\n- pw.flush();\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "FASTER 0.1258", "pair_id": "java_5822_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0911} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n-\n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n-\n- long diff = ((N * N) + 1) / 2;\n-\n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n }\n }\n }\n+\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ public String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+ }\n }", "output": "FASTER 0.6939", "pair_id": "java_5768_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.6177} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class Codechef {\n- public static void main(String[] args) throws java.lang.Exception {\n+public class Test {\n+\n+ public static void main(String[] args) throws Exception {\n+ int[] nums0 = {1, 2, 2, 1, 0, 0};\n+ int[] nums1 = {0, 0, 1, 2, 2, 1};\n+\n Scanner sc = new Scanner(System.in);\n- int noOfMoves = sc.nextInt();\n- int index = sc.nextInt();\n-\n- int position = index;\n-\n- for (int i = noOfMoves % 6; i >= 1; i--) {\n- if (i % 2 == 0) {\n- if (position == 2) position = 1;\n- else if (position == 1) position = 2;\n+ int n = sc.nextInt();\n+ int current = sc.nextInt();\n+ int rem = n - (n / 6) * 6;\n+ if (rem == 0) {\n+ System.out.println(current);\n+ } else {\n+ if (nums0[rem - 1] == current) {\n+ System.out.println(\"0\");\n+ } else if (nums1[rem - 1] == current) {\n+ System.out.println(\"1\");\n } else {\n- if (position == 1) position = 0;\n- else if (position == 0) position = 1;\n+ System.out.println(\"2\");\n }\n }\n-\n- System.out.println(position);\n }\n }", "output": "SLOWER 0.0813", "pair_id": "java_421_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String s = br.readLine();\n StringTokenizer st = new StringTokenizer(s);\n int n = Integer.parseInt(st.nextToken());\n int countp = 0;\n int countn = 0;\n int countz = 0;\n int[] x = new int[n];\n s = br.readLine();\n st = new StringTokenizer(s);\n for (int i = 0; i < n; i++) {\n\n x[i] = Integer.parseInt(st.nextToken());\n\n if (x[i] > 0) countp++;\n else if (x[i] < 0) countn++;\n else countz++;\n }\n\n if (countn % 2 != 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 2) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 2) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 != 0) {\n System.out.print(countn + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + \" \");\n\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n }\n } else if (countn % 2 == 0 && countp == 0) {\n int k = countn;\n System.out.print(countn - 3 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0 && k > 3) {\n System.out.print(x[i] + \" \");\n k--;\n }\n }\n System.out.println();\n System.out.print(countp + 2 + \" \");\n for (int i = 0; i < x.length; i++) {\n\n if (x[i] < 0) {\n countn--;\n if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n }\n }\n System.out.println();\n System.out.print(countz + 1 + \" \");\n boolean flag = true;\n for (int i = x.length - 1; i > 0; i--) {\n if (x[i] == 0) System.out.print(x[i] + \" \");\n else if (x[i] < 0 && flag == true) {\n System.out.print(x[i] + \" \");\n flag = false;\n }\n }\n } else {\n int position = 0;\n\n boolean flag = false;\n for (int i = 0; i < x.length; i++) {\n if (x[i] < 0) {\n position = i;\n break;\n }\n }\n System.out.println(1 + \" \" + x[position]);\n System.out.print(countp + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] > 0) System.out.print(x[i] + \" \");\n }\n System.out.println();\n System.out.print(countz + countn - 1 + \" \");\n for (int i = 0; i < x.length; i++) {\n if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String s = br.readLine();\n- StringTokenizer st = new StringTokenizer(s);\n- int n = Integer.parseInt(st.nextToken());\n- int countp = 0;\n- int countn = 0;\n- int countz = 0;\n- int[] x = new int[n];\n- s = br.readLine();\n- st = new StringTokenizer(s);\n+public class ArrayA_300A {\n+\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n-\n- x[i] = Integer.parseInt(st.nextToken());\n-\n- if (x[i] > 0) countp++;\n- else if (x[i] < 0) countn++;\n- else countz++;\n+ arr[i] = sc.nextInt();\n }\n-\n- if (countn % 2 != 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 2) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n+ Arrays.sort(arr);\n+ System.out.println(1 + \" \" + arr[0]);\n+ if (arr[n - 1] > 0) {\n+ System.out.println(1 + \" \" + arr[n - 1]);\n+ System.out.print(n - 2 + \" \");\n+ for (int i = 1; i < n - 1; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 2) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 != 0) {\n- System.out.print(countn + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + \" \");\n-\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- }\n- } else if (countn % 2 == 0 && countp == 0) {\n- int k = countn;\n- System.out.print(countn - 3 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0 && k > 3) {\n- System.out.print(x[i] + \" \");\n- k--;\n- }\n- }\n- System.out.println();\n- System.out.print(countp + 2 + \" \");\n- for (int i = 0; i < x.length; i++) {\n-\n- if (x[i] < 0) {\n- countn--;\n- if (countn < 3 && countn >= 1) System.out.print(x[i] + \" \");\n- }\n- }\n- System.out.println();\n- System.out.print(countz + 1 + \" \");\n- boolean flag = true;\n- for (int i = x.length - 1; i > 0; i--) {\n- if (x[i] == 0) System.out.print(x[i] + \" \");\n- else if (x[i] < 0 && flag == true) {\n- System.out.print(x[i] + \" \");\n- flag = false;\n- }\n- }\n } else {\n- int position = 0;\n-\n- boolean flag = false;\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] < 0) {\n- position = i;\n- break;\n- }\n- }\n- System.out.println(1 + \" \" + x[position]);\n- System.out.print(countp + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] > 0) System.out.print(x[i] + \" \");\n- }\n- System.out.println();\n- System.out.print(countz + countn - 1 + \" \");\n- for (int i = 0; i < x.length; i++) {\n- if (x[i] == 0 || (x[i] < 0 && i != position)) System.out.print(x[i] + \" \");\n+ System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n+ System.out.print(n - 3 + \" \");\n+ for (int i = 3; i < n; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n }\n }", "output": "SLOWER 1.8636", "pair_id": "java_6817_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 3.6392} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class TaskC {\n+public class Codechef {\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner sc = new Scanner(System.in);\n+ int noOfMoves = sc.nextInt();\n+ int index = sc.nextInt();\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int[] arr = {0, 0, 0};\n- int x = sc.nextInt();\n- arr[x] = 1;\n- int i = 0;\n- for (i = n; i > 0 && arr[1] != 1; i--) {\n+ int position = index;\n+\n+ for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n- int t = arr[1];\n- arr[1] = arr[2];\n- arr[2] = t;\n+ if (position == 2) position = 1;\n+ else if (position == 1) position = 2;\n } else {\n- int t = arr[0];\n- arr[0] = arr[1];\n- arr[1] = t;\n- }\n- }\n- if (i == 0) {\n- for (int j = 0; j < 3; j++) {\n- if (arr[j] == 1) {\n- System.out.println(j);\n- break;\n- }\n- }\n- } else {\n- if (i % 2 == 0) {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(2);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(0);\n- }\n- } else {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(0);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(2);\n- }\n+ if (position == 1) position = 0;\n+ else if (position == 0) position = 1;\n }\n }\n \n- sc.close();\n+ System.out.println(position);\n }\n }", "output": "FASTER 0.0083", "pair_id": "java_420_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0058} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n x -= a;\n while (b <= x) {\n x -= b;\n }\n System.out.println(x);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n- System.out.println((X - A) % B);\n+ int x = sc.nextInt(), a = sc.nextInt(), b = sc.nextInt();\n+ x -= a;\n+ while (b <= x) {\n+ x -= b;\n+ }\n+ System.out.println(x);\n }\n }", "output": "FASTER 0.0682", "pair_id": "java_6638_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0484} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Test {\n-\n- public static void main(String[] args) throws Exception {\n- int[] nums0 = {1, 2, 2, 1, 0, 0};\n- int[] nums1 = {0, 0, 1, 2, 2, 1};\n-\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int current = sc.nextInt();\n- int rem = n - (n / 6) * 6;\n- if (rem == 0) {\n- System.out.println(current);\n- } else {\n- if (nums0[rem - 1] == current) {\n- System.out.println(\"0\");\n- } else if (nums1[rem - 1] == current) {\n- System.out.println(\"1\");\n- } else {\n- System.out.println(\"2\");\n- }\n- }\n+public class ShellGame {\n+ public static void main(String[] args) {\n+ Scanner nw = new Scanner(System.in);\n+ int n = nw.nextInt();\n+ int pos = nw.nextInt();\n+ String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n+ (n) %= elm.length;\n+ System.out.println(elm[n].charAt(pos));\n }\n }", "output": "SLOWER 0.0658", "pair_id": "java_427_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0467} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Test {\n-\n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n-\n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n+ st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n }\n- boolean ans = false;\n for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n-\n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n }\n }\n }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n-\n- public void setCoins(long money) {\n- this.coins = money;\n- }\n- }\n-\n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n }\n return true;\n }\n \n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n }\n \n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n }\n \n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n- }\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n }", "output": "FASTER 5.2994", "pair_id": "java_4697_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 39.3802} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class edu_1027_B {\n+ static long ans = 1000000000;\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- }\n- out.println(ans);\n- } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n+\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[64];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n }\n }\n \n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n+ public static void main(String args[]) throws IOException {\n+ Reader ob = new Reader();\n+ long n = ob.nextLong();\n \n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n+ int q = ob.nextInt();\n+ while (q != 0) {\n+ long x = ob.nextLong();\n+ long y = ob.nextLong();\n \n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n+ long ans = 0, end = 0;\n+\n+ if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n+ else {\n+ if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n+ else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n- return st.nextToken();\n- }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n+ q--;\n }\n }\n }", "output": "SLOWER 0.0918", "pair_id": "java_5763_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0657} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n-\n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n }\n \n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n+ if (n % 2 == 0) {\n+ x = (n * n);\n+ x /= 2;\n+ } else {\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n+ }\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n }\n }\n }", "output": "SLOWER 0.5614", "pair_id": "java_5785_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.4757} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class B {\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ private static long N;\n+ private static long LAST;\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n+ LAST = N * N / 2 + (N & 1);\n \n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n \n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n+ private static long number(long i, long j) {\n \n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n- }\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 1.3722", "pair_id": "java_5791_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.5887} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.awt.*;\n+import java.util.Scanner;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n+public class TwoSquares {\n+ public static void main(String[] args) {\n+ Scanner s = new Scanner(System.in);\n+\n+ int minX = Integer.MAX_VALUE;\n+ int maxX = Integer.MIN_VALUE;\n+ int minY = Integer.MAX_VALUE;\n+ int maxY = Integer.MIN_VALUE;\n+\n for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ minX = Math.min(x, minX);\n+ maxX = Math.max(x, maxX);\n+ minY = Math.min(y, minY);\n+ maxY = Math.max(y, maxY);\n }\n- st = new StringTokenizer(in.readLine());\n+ int[] xPoints = new int[4];\n+ int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n+ xPoints[i] = s.nextInt();\n+ yPoints[i] = s.nextInt();\n }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n+\n+ boolean overlap = false;\n+ Polygon p = new Polygon(xPoints, yPoints, 4);\n+ for (int i = minX; i <= maxX; i++) {\n+ for (int j = minY; j <= maxY; j++) {\n+ if (p.contains(i - 0.1, j)) overlap = true;\n+ else if (p.contains(i + 0.1, j)) overlap = true;\n+ else if (p.contains(i, j - 0.1)) overlap = true;\n+ else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ if (overlap) System.out.println(\"YES\");\n+ else System.out.println(\"NO\");\n }\n }", "output": "SLOWER 6.6507", "pair_id": "java_4701_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 100.477} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.Arrays;\n+import java.util.NoSuchElementException;\n \n public class Main {\n- static int N = 300005;\n- static int tree[];\n+ public static class SegmentTree {\n+ int[] tree;\n+\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n+\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n+\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ }\n+ }\n+\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n+\n+ public int query(int a, int b, int k, int l, int r) {\n+\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n+ }\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n+ }\n+ }\n \n public static void main(String[] args) {\n- int n, m;\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- tree = new int[N];\n- for (int i = 0; i < N; i++) {\n- tree[i] = 2147483647;\n- }\n-\n- int nMax = 1;\n- n = n - 1;\n- while (n > 0) {\n- n = n / 2;\n- nMax = nMax << 1;\n- }\n- if (nMax == 1) nMax = 2;\n-\n- for (int i = 0; i < m; i++) {\n- int temp = 0;\n- int x, y, val;\n- temp = in.nextInt();\n- if (temp == 0) {\n- x = in.nextInt();\n- y = in.nextInt();\n- val = in.nextInt();\n- update(x, y, val, 0, nMax - 1, 0);\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n \n } else {\n- x = in.nextInt();\n- int res = find(x, x, 0, nMax - 1, 0);\n- System.out.println(res);\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n }\n }\n }\n \n- private static int find(int x, int y, int left, int right, int nodeId) {\n- if (left > y || right < x) return -1;\n- else if (left <= x && right >= y && tree[nodeId] >= 0) {\n- return tree[nodeId];\n- } else {\n- int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n- int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n- return Math.max(num1, num2);\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n- }\n \n- private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n+ }\n \n- if (x > right || y < left) return;\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n \n- if (x <= left && y >= right) {\n- tree[nodeId] = val;\n- } else {\n- if (tree[nodeId] >= 0) {\n- tree[nodeId * 2 + 1] = tree[nodeId];\n- tree[nodeId * 2 + 2] = tree[nodeId];\n- tree[nodeId] = -1;\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n }\n- update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n- update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n }\n }\n }", "output": "FASTER 1.7492", "pair_id": "java_5728_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 3.3617} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n-\n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n+ st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n }\n }\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n+ }\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n+ }\n+\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n+ }\n+\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 6.6507", "pair_id": "java_4701_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 100.477} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += (i * (i + 1));\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+public class JavaApplication42 {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n+\n+ Scanner inp = new Scanner(System.in);\n+ int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n- sum += (i * (i + 1));\n+ sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }", "output": "SLOWER 0.0849", "pair_id": "java_186_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0606} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Codechef {\n public static void main(String[] args) throws java.lang.Exception {\n Scanner sc = new Scanner(System.in);\n int noOfMoves = sc.nextInt();\n int index = sc.nextInt();\n\n int position = index;\n\n for (int i = noOfMoves % 6; i >= 1; i--) {\n if (i % 2 == 0) {\n if (position == 2) position = 1;\n else if (position == 1) position = 2;\n } else {\n if (position == 1) position = 0;\n else if (position == 0) position = 1;\n }\n }\n\n System.out.println(position);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Main {\n- static void move(int[] shells, int i) {\n- int a, b;\n+public class Codechef {\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner sc = new Scanner(System.in);\n+ int noOfMoves = sc.nextInt();\n+ int index = sc.nextInt();\n \n- if (i % 2 == 0) {\n- a = 1;\n- b = 2;\n- } else {\n- a = 0;\n- b = 1;\n- }\n+ int position = index;\n \n- int tmp = shells[a];\n- shells[a] = shells[b];\n- shells[b] = tmp;\n- }\n-\n- static String getState(int[] shells, int i) {\n- String state = Integer.toString(i % 2);\n-\n- state += Integer.toString(shells[0]);\n- state += Integer.toString(shells[1]);\n- state += Integer.toString(shells[2]);\n-\n- return state;\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n- Scanner in = new Scanner(System.in);\n-\n- int n = in.nextInt();\n- int x = in.nextInt();\n-\n- int[] shells = new int[3];\n- shells[x] = 1;\n-\n- ArrayList states = new ArrayList<>();\n-\n- for (int i = n; i >= 0; i--) {\n- String state = getState(shells, i);\n-\n- int idx = states.indexOf(state);\n-\n- if (idx != -1) {\n-\n- break;\n- }\n-\n- states.add(state);\n-\n- if (i > 0) {\n- move(shells, i);\n+ for (int i = noOfMoves % 6; i >= 1; i--) {\n+ if (i % 2 == 0) {\n+ if (position == 2) position = 1;\n+ else if (position == 1) position = 2;\n+ } else {\n+ if (position == 1) position = 0;\n+ else if (position == 0) position = 1;\n }\n }\n \n- int cycleLength = states.size();\n- int r = n % cycleLength;\n-\n- System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n+ System.out.println(position);\n }\n }", "output": "FASTER 0.1529", "pair_id": "java_423_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.1118} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ static class BNumbersOnTheChessboard {\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ long n = in.nextLong();\n+ int q = in.nextInt();\n+ long nn = n * n;\n+ long nn2 = nn / 2 + nn % 2;\n+ for (int i = 0; i < q; i++) {\n+ long x = in.nextLong();\n+ long y = in.nextLong();\n+ long ans;\n+ if ((x + y) % 2 == 0) {\n+ ans = 0;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += (y + 1) / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ }\n+ out.println(ans);\n+ } else {\n+ ans = nn2;\n+ if (x % 2 == 1) {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x / 2);\n+ }\n+ ans += y / 2;\n+ } else {\n+ if (n % 2 == 0) {\n+ ans += (x - 1) * (n / 2);\n+ } else {\n+ ans += (x - 1) * (n / 2) + (x - 1) / 2;\n+ }\n+ ans += (y + 1) / 2;\n+ }\n+ out.println(ans);\n+ }\n+ }\n+ }\n+ }\n+\n+ static class FastScanner {\n+ private BufferedReader br;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream inputStream) {\n+ br = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- String next() {\n+ public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n- int nextInt() {\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- long nextLong() {\n+ public long nextLong() {\n return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n- }\n }\n }\n }", "output": "FASTER 0.6649", "pair_id": "java_5767_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.5855} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n static int N = 300005;\n static int tree[];\n\n public static void main(String[] args) {\n int n, m;\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n tree = new int[N];\n for (int i = 0; i < N; i++) {\n tree[i] = 2147483647;\n }\n\n int nMax = 1;\n n = n - 1;\n while (n > 0) {\n n = n / 2;\n nMax = nMax << 1;\n }\n if (nMax == 1) nMax = 2;\n\n for (int i = 0; i < m; i++) {\n int temp = 0;\n int x, y, val;\n temp = in.nextInt();\n if (temp == 0) {\n x = in.nextInt();\n y = in.nextInt();\n val = in.nextInt();\n update(x, y, val, 0, nMax - 1, 0);\n\n } else {\n x = in.nextInt();\n int res = find(x, x, 0, nMax - 1, 0);\n System.out.println(res);\n }\n }\n }\n\n private static int find(int x, int y, int left, int right, int nodeId) {\n if (left > y || right < x) return -1;\n else if (left <= x && right >= y && tree[nodeId] >= 0) {\n return tree[nodeId];\n } else {\n int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n return Math.max(num1, num2);\n }\n }\n\n private static void update(int x, int y, int val, int left, int right, int nodeId) {\n\n if (x > right || y < left) return;\n\n if (x <= left && y >= right) {\n tree[nodeId] = val;\n } else {\n if (tree[nodeId] >= 0) {\n tree[nodeId * 2 + 1] = tree[nodeId];\n tree[nodeId * 2 + 2] = tree[nodeId];\n tree[nodeId] = -1;\n }\n update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.Arrays;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n \n public class Main {\n- public static class SegmentTree {\n- int[] tree;\n+ static int N = 300005;\n+ static int tree[];\n \n- public SegmentTree(int n) {\n- int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n- tree = new int[(int) Math.pow(2, d + 1)];\n- Arrays.fill(tree, -1);\n- tree[0] = Integer.MAX_VALUE;\n+ public static void main(String[] args) {\n+ int n, m;\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ tree = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ tree[i] = 2147483647;\n }\n \n- public int find(int i) {\n- i += tree.length / 2 - 1;\n- int r = tree[i];\n- while (i > 0) {\n- i = (i - 1) / 2;\n- if (tree[i] >= 0) r = tree[i];\n- }\n- return r;\n+ int nMax = 1;\n+ n = n - 1;\n+ while (n > 0) {\n+ n = n / 2;\n+ nMax = nMax << 1;\n }\n+ if (nMax == 1) nMax = 2;\n \n- public void update(int i, int x) {\n- i += tree.length / 2 - 1;\n- tree[i] = x;\n- while (i > 0) {\n- i = (i - 1) / 2;\n- tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n- }\n- }\n-\n- public void updateRange(int a, int b, int x, int k, int l, int r) {\n- if (r <= a || b < l) return;\n- if (a <= l && r - 1 <= b) tree[k] = x;\n- else {\n- if (tree[k] >= 0) {\n- tree[k * 2 + 1] = tree[k];\n- tree[k * 2 + 2] = tree[k];\n- tree[k] = -1;\n- }\n- updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n- updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n- }\n- }\n-\n- public int query(int a, int b, int k, int l, int r) {\n-\n- if (r <= a || b < l) return Integer.MAX_VALUE;\n- if (a <= l && r - 1 <= b) return tree[k];\n- else {\n- int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n- int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n- return Math.min(vl, vr);\n- }\n- }\n-\n- public void print() {\n- int d = 2;\n- for (int i = 0; i < tree.length - 1; i++) {\n- System.out.print(tree[i] + \" \");\n- if (i == d - 2) {\n- System.out.println();\n- d *= 2;\n- }\n- }\n- System.out.println();\n- }\n- }\n-\n- public static void main(String[] args) {\n- FS r = new FS();\n- int n = r.nextInt();\n- int q = r.nextInt();\n- SegmentTree seg = new SegmentTree(n);\n- for (int k = 0; k < q; k++) {\n- int c = r.nextInt();\n- if (c == 0) {\n- int s = r.nextInt();\n- int t = r.nextInt();\n- int x = r.nextInt();\n- seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n+ for (int i = 0; i < m; i++) {\n+ int temp = 0;\n+ int x, y, val;\n+ temp = in.nextInt();\n+ if (temp == 0) {\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ val = in.nextInt();\n+ update(x, y, val, 0, nMax - 1, 0);\n \n } else {\n- int i = r.nextInt();\n- System.out.println(seg.find(i));\n+ x = in.nextInt();\n+ int res = find(x, x, 0, nMax - 1, 0);\n+ System.out.println(res);\n }\n }\n }\n \n- static class FS {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n+ private static int find(int x, int y, int left, int right, int nodeId) {\n+ if (left > y || right < x) return -1;\n+ else if (left <= x && right >= y && tree[nodeId] >= 0) {\n+ return tree[nodeId];\n+ } else {\n+ int num1 = find(x, y, left, (left + right) / 2, nodeId * 2 + 1);\n+ int num2 = find(x, y, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n+ return Math.max(num1, num2);\n+ }\n+ }\n \n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n+ private static void update(int x, int y, int val, int left, int right, int nodeId) {\n+\n+ if (x > right || y < left) return;\n+\n+ if (x <= left && y >= right) {\n+ tree[nodeId] = val;\n+ } else {\n+ if (tree[nodeId] >= 0) {\n+ tree[nodeId * 2 + 1] = tree[nodeId];\n+ tree[nodeId * 2 + 2] = tree[nodeId];\n+ tree[nodeId] = -1;\n }\n- return true;\n- }\n-\n- private int readByte() {\n- return hasNextByte() ? buffer[ptr++] : -1;\n- }\n-\n- private boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n+ update(x, y, val, left, (left + right) / 2, nodeId * 2 + 1);\n+ update(x, y, val, (left + right) / 2 + 1, right, nodeId * 2 + 2);\n }\n }\n }", "output": "SLOWER 1.7492", "pair_id": "java_5728_reversed", "problem_id": "p02348", "language": "java", "direction": "reversed", "speedup_ratio": 3.3617} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n+ public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n- System.out.println((X - A) % B);\n+ System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n }", "output": "FASTER 0.0159", "pair_id": "java_6640_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0111} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n-\n-public class TwoSquares {\n- public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n-\n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n- }\n-\n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n- }\n- }\n-\n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 5.8057", "pair_id": "java_4731_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 55.9359} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class helloWorld {\n+public class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- int ans = 0;\n-\n- for (int i = 2; i < n; i++) ans += i * (i + 1);\n-\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n+ }\n System.out.println(ans);\n-\n- in.close();\n }\n }", "output": "SLOWER 0.0029", "pair_id": "java_211_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.002} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Arrays;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static class SegmentTree {\n int[] tree;\n\n public SegmentTree(int n) {\n int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n tree = new int[(int) Math.pow(2, d + 1)];\n Arrays.fill(tree, -1);\n tree[0] = Integer.MAX_VALUE;\n }\n\n public int find(int i) {\n i += tree.length / 2 - 1;\n int r = tree[i];\n while (i > 0) {\n i = (i - 1) / 2;\n if (tree[i] >= 0) r = tree[i];\n }\n return r;\n }\n\n public void update(int i, int x) {\n i += tree.length / 2 - 1;\n tree[i] = x;\n while (i > 0) {\n i = (i - 1) / 2;\n tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n }\n }\n\n public void updateRange(int a, int b, int x, int k, int l, int r) {\n if (r <= a || b < l) return;\n if (a <= l && r - 1 <= b) tree[k] = x;\n else {\n if (tree[k] >= 0) {\n tree[k * 2 + 1] = tree[k];\n tree[k * 2 + 2] = tree[k];\n tree[k] = -1;\n }\n updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n }\n }\n\n public int query(int a, int b, int k, int l, int r) {\n\n if (r <= a || b < l) return Integer.MAX_VALUE;\n if (a <= l && r - 1 <= b) return tree[k];\n else {\n int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n return Math.min(vl, vr);\n }\n }\n\n public void print() {\n int d = 2;\n for (int i = 0; i < tree.length - 1; i++) {\n System.out.print(tree[i] + \" \");\n if (i == d - 2) {\n System.out.println();\n d *= 2;\n }\n }\n System.out.println();\n }\n }\n\n public static void main(String[] args) {\n FS r = new FS();\n int n = r.nextInt();\n int q = r.nextInt();\n SegmentTree seg = new SegmentTree(n);\n for (int k = 0; k < q; k++) {\n int c = r.nextInt();\n if (c == 0) {\n int s = r.nextInt();\n int t = r.nextInt();\n int x = r.nextInt();\n seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n\n } else {\n int i = r.nextInt();\n System.out.println(seg.find(i));\n }\n }\n }\n\n static class FS {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n return hasNextByte() ? buffer[ptr++] : -1;\n }\n\n private boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.Arrays;\n+import java.util.NoSuchElementException;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+ public static class SegmentTree {\n+ int[] tree;\n \n- public static void main(String[] args) {\n+ public SegmentTree(int n) {\n+ int d = (int) Math.ceil(Math.log((double) n) / Math.log(2.0));\n+ tree = new int[(int) Math.pow(2, d + 1)];\n+ Arrays.fill(tree, -1);\n+ tree[0] = Integer.MAX_VALUE;\n+ }\n \n- Scanner sc = new Scanner(System.in);\n+ public int find(int i) {\n+ i += tree.length / 2 - 1;\n+ int r = tree[i];\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ if (tree[i] >= 0) r = tree[i];\n+ }\n+ return r;\n+ }\n \n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n+ public void update(int i, int x) {\n+ i += tree.length / 2 - 1;\n+ tree[i] = x;\n+ while (i > 0) {\n+ i = (i - 1) / 2;\n+ tree[i] = Math.min(tree[i * 2 + 1], tree[i * 2 + 2]);\n+ }\n+ }\n \n- init(n1);\n- arr = new int[op_num];\n+ public void updateRange(int a, int b, int x, int k, int l, int r) {\n+ if (r <= a || b < l) return;\n+ if (a <= l && r - 1 <= b) tree[k] = x;\n+ else {\n+ if (tree[k] >= 0) {\n+ tree[k * 2 + 1] = tree[k];\n+ tree[k * 2 + 2] = tree[k];\n+ tree[k] = -1;\n+ }\n+ updateRange(a, b, x, k * 2 + 1, l, (l + r) / 2);\n+ updateRange(a, b, x, k * 2 + 2, (l + r) / 2, r);\n+ }\n+ }\n \n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n- } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n+ public int query(int a, int b, int k, int l, int r) {\n+\n+ if (r <= a || b < l) return Integer.MAX_VALUE;\n+ if (a <= l && r - 1 <= b) return tree[k];\n+ else {\n+ int vl = query(a, b, k * 2 + 1, l, (l + r) / 2);\n+ int vr = query(a, b, k * 2 + 2, (l + r) / 2, r);\n+ return Math.min(vl, vr);\n }\n- i1++;\n- mark++;\n+ }\n+\n+ public void print() {\n+ int d = 2;\n+ for (int i = 0; i < tree.length - 1; i++) {\n+ System.out.print(tree[i] + \" \");\n+ if (i == d - 2) {\n+ System.out.println();\n+ d *= 2;\n+ }\n+ }\n+ System.out.println();\n }\n }\n \n- private static int find(int n1, int n2) {\n+ public static void main(String[] args) {\n+ FS r = new FS();\n+ int n = r.nextInt();\n+ int q = r.nextInt();\n+ SegmentTree seg = new SegmentTree(n);\n+ for (int k = 0; k < q; k++) {\n+ int c = r.nextInt();\n+ if (c == 0) {\n+ int s = r.nextInt();\n+ int t = r.nextInt();\n+ int x = r.nextInt();\n+ seg.updateRange(s, t, x, 0, 0, seg.tree.length / 2);\n \n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n+ } else {\n+ int i = r.nextInt();\n+ System.out.println(seg.find(i));\n+ }\n }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n }\n \n- public static void update(int a, int b, int k, int l, int r, int mark) {\n+ static class FS {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n \n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n \n- public static void init(int N) {\n+ private int readByte() {\n+ return hasNextByte() ? buffer[ptr++] : -1;\n+ }\n \n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ private boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n }\n }\n }", "output": "FASTER 1.6844", "pair_id": "java_5727_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 3.2141} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n-\n- pw.println(\"NO\");\n- pw.close();\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 4.4762", "pair_id": "java_4728_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 22.2574} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Demo {\n-\n- public static void main(String[] args) {\n-\n- int n, n1, n2, n3;\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n- n1 = 0;\n- n2 = 0;\n- n3 = 0;\n- n = sc.nextInt();\n- int[] arr = new int[n];\n-\n- for (int i = 0; i < arr.length; i++) {\n- arr[i] = sc.nextInt();\n-\n- if (arr[i] < 0) {\n- n1++;\n- } else if (arr[i] > 0) {\n- n2++;\n- } else {\n- n3++;\n- }\n- }\n- int index1 = 0;\n- int index2 = 0;\n- int index3 = 0;\n- boolean isPositive = true;\n- if (n2 == 0) {\n- n2 = 2;\n- isPositive = false;\n- n1 -= 2;\n- }\n- boolean isAdd = true;\n- if (n1 % 2 == 0) {\n- n1--;\n- n3++;\n- isAdd = false;\n+ int n = sc.nextInt();\n+ int zeros = 0;\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n+ for (int i = 0; i < n; i++) {\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n }\n \n- int[] arr1 = new int[n1];\n- int[] arr2 = new int[n2];\n- int[] arr3 = new int[n3];\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n+ }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n \n- for (int i = 0; i < arr.length; i++) {\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else {\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ }\n+ System.out.println();\n \n- if (arr[i] < 0) {\n- if (isPositive == false && index2 < arr2.length) {\n- arr2[index2++] = arr[i];\n- } else if (isAdd == false) {\n- arr3[index3++] = arr[i];\n- isAdd = true;\n- } else {\n- arr1[index1++] = arr[i];\n- }\n- } else if (arr[i] > 0) {\n- arr2[index2++] = arr[i];\n- } else {\n- arr3[index3++] = arr[i];\n- }\n- }\n- intMang(arr1);\n- intMang(arr2);\n- intMang(arr3);\n- }\n-\n- public static void intMang(int[] arr) {\n- System.out.print(arr.length + \" \");\n- for (int i = 0; i < arr.length; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println(\"\");\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n+ System.out.println();\n }\n }", "output": "FASTER 0.0249", "pair_id": "java_6830_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0174} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class A5 {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextLong();\n int x = in.nextInt();\n int[] a = new int[] {0, 0, 0};\n a[x] = 1;\n n %= 6;\n\n for (long i = n; i > 0; --i) {\n if (i % 2 == 1) {\n int t = a[0];\n a[0] = a[1];\n a[1] = t;\n } else {\n int t = a[1];\n a[1] = a[2];\n a[2] = t;\n }\n }\n System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Test {\n+public class A5 {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextLong();\n+ int x = in.nextInt();\n+ int[] a = new int[] {0, 0, 0};\n+ a[x] = 1;\n+ n %= 6;\n \n- public static void main(String[] args) throws Exception {\n- int[] nums0 = {1, 2, 2, 1, 0, 0};\n- int[] nums1 = {0, 0, 1, 2, 2, 1};\n-\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int current = sc.nextInt();\n- int rem = n - (n / 6) * 6;\n- if (rem == 0) {\n- System.out.println(current);\n- } else {\n- if (nums0[rem - 1] == current) {\n- System.out.println(\"0\");\n- } else if (nums1[rem - 1] == current) {\n- System.out.println(\"1\");\n+ for (long i = n; i > 0; --i) {\n+ if (i % 2 == 1) {\n+ int t = a[0];\n+ a[0] = a[1];\n+ a[1] = t;\n } else {\n- System.out.println(\"2\");\n+ int t = a[1];\n+ a[1] = a[2];\n+ a[2] = t;\n }\n }\n+ System.out.println(a[0] == 1 ? \"0\" : a[1] == 1 ? \"1\" : \"2\");\n }\n }", "output": "FASTER 0.1177", "pair_id": "java_417_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.085} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.BufferedOutputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class B {\n-\n- static long N;\n+public class EducationalRound49B {\n \n public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n+ out = new PrintWriter(new BufferedOutputStream(System.out));\n+ FastReader s = new FastReader();\n+ long n = s.nextLong();\n+ int q = s.nextInt();\n+ while (q > 0) {\n+ int x = s.nextInt();\n+ int y = s.nextInt();\n+ long ans = 0;\n+ if ((x + y) % 2 == 0) {\n+ long rem;\n+ if (x % 2 != 0) rem = (y + 1) / 2;\n+ else rem = y / 2 + (n + 1) / 2;\n+ out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n+ long rem;\n+ if (x % 2 != 0) rem = y / 2;\n+ else rem = (y + 1) / 2 + n / 2;\n+ out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n+ q--;\n }\n+ out.close();\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ public static PrintWriter out;\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n+ public static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() {\n- return (int) nextLong();\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n+ long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n+ return str;\n }\n }\n }", "output": "FASTER 0.1383", "pair_id": "java_5774_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.1006} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.Scanner;\n \n-public class Main {\n+public class B {\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ private static long N;\n+ private static long LAST;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ public static void main(String[] args) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- long diff = ((N * N) + 1) / 2;\n+ LAST = N * N / 2 + (N & 1);\n \n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n \n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n }\n }\n }\n+\n+ private static long number(long i, long j) {\n+\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n+ }\n }", "output": "SLOWER 0.7702", "pair_id": "java_5821_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7055} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n-\n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n- }\n-\n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n- }\n-\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n- }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n }\n return false;\n }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n+ }\n }", "output": "SLOWER 3.6249", "pair_id": "java_4735_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 12.337} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n+class Main {\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n+\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+\n+ System.out.println((X - A) % B);\n }\n }", "output": "FASTER 0.1223", "pair_id": "java_6633_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0885} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class R181D2A {\n\n public static void main(String[] args) throws Exception {\n new gao().hugao();\n }\n}\n\nclass gao {\n\n Scanner in = new Scanner(System.in);\n List li;\n List ll;\n\n void hugao() throws Exception {\n int n = in.nextInt();\n int ze = 0, tag = 0, y = 0;\n li = new ArrayList();\n ll = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n if (x == 0) ze++;\n else if (x < 0) {\n if (tag == 0) {\n y = x;\n tag = 1;\n } else ll.add(x);\n } else li.add(x);\n }\n int z = ll.size();\n if ((ll.size() & 1) > 0) z--;\n System.out.println(1 + \" \" + y);\n System.out.print(li.size() + z);\n for (int x : li) System.out.print(\" \" + x);\n for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n System.out.print(ze + ll.size() - z);\n for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Problem023_300A_Array {\n- public static void main(String args[]) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int zeros = 0;\n- ArrayList positive = new ArrayList();\n- ArrayList negative = new ArrayList();\n- boolean hasPositive = false;\n- int temp;\n- boolean moveNegativeToZero = false;\n- int valueOfMoveNegativeToZero = 0;\n- for (int i = 0; i < n; i++) {\n- temp = sc.nextInt();\n- if (temp == 0) zeros++;\n- else if (temp > 0) {\n- hasPositive = true;\n- positive.add(temp);\n- } else negative.add(temp);\n- }\n+public class R181D2A {\n \n- if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n- moveNegativeToZero = true;\n- valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n- negative.remove(negative.size() - 1);\n- }\n- if (hasPositive) {\n- System.out.print(negative.size() + \" \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else System.out.print(negative.size() - 2 + \" \");\n- for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n- System.out.println();\n-\n- if (!hasPositive) {\n- System.out.print(\"2 \");\n- for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n- } else {\n- System.out.print(positive.size() + \" \");\n- for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n- }\n- System.out.println();\n-\n- System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n- for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n- if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n- System.out.println();\n+ public static void main(String[] args) throws Exception {\n+ new gao().hugao();\n }\n }\n+\n+class gao {\n+\n+ Scanner in = new Scanner(System.in);\n+ List li;\n+ List ll;\n+\n+ void hugao() throws Exception {\n+ int n = in.nextInt();\n+ int ze = 0, tag = 0, y = 0;\n+ li = new ArrayList();\n+ ll = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ if (x == 0) ze++;\n+ else if (x < 0) {\n+ if (tag == 0) {\n+ y = x;\n+ tag = 1;\n+ } else ll.add(x);\n+ } else li.add(x);\n+ }\n+ int z = ll.size();\n+ if ((ll.size() & 1) > 0) z--;\n+ System.out.println(1 + \" \" + y);\n+ System.out.print(li.size() + z);\n+ for (int x : li) System.out.print(\" \" + x);\n+ for (int i = 0; i < z; i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ System.out.print(ze + ll.size() - z);\n+ for (int i = 0; i < ze; i++) System.out.print(\" \" + 0);\n+ for (int i = z; i < ll.size(); i++) System.out.print(\" \" + ll.get(i));\n+ System.out.println(\"\");\n+ }\n+}", "output": "FASTER 0.0114", "pair_id": "java_6827_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0079} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n import java.io.InputStream;\n+import java.io.InputStreamReader;\n import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n+ }\n+\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n }\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n \n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n- }\n- }\n- out.println(\"NO\");\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n- }\n-\n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n- }\n- }\n-\n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n-\n- public FastInput(InputStream is) {\n- this.is = is;\n- }\n-\n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n }\n- if (bufLen == -1) {\n- return -1;\n- }\n- }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n }\n }\n \n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n- }\n- }\n-\n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n-\n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n- }\n- }\n-\n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n }\n \n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n- }\n-\n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n-\n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- }\n-\n- public String toString() {\n- return cache.toString();\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n }\n }", "output": "SLOWER 3.2701", "pair_id": "java_4751_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 9.6472} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class Main {\n-\n+public class MyClass {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n+ Scanner in = new Scanner(System.in);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 5.099", "pair_id": "java_181_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 34.2722} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static void move(int[] shells, int i) {\n int a, b;\n\n if (i % 2 == 0) {\n a = 1;\n b = 2;\n } else {\n a = 0;\n b = 1;\n }\n\n int tmp = shells[a];\n shells[a] = shells[b];\n shells[b] = tmp;\n }\n\n static String getState(int[] shells, int i) {\n String state = Integer.toString(i % 2);\n\n state += Integer.toString(shells[0]);\n state += Integer.toString(shells[1]);\n state += Integer.toString(shells[2]);\n\n return state;\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n Scanner in = new Scanner(System.in);\n\n int n = in.nextInt();\n int x = in.nextInt();\n\n int[] shells = new int[3];\n shells[x] = 1;\n\n ArrayList states = new ArrayList<>();\n\n for (int i = n; i >= 0; i--) {\n String state = getState(shells, i);\n\n int idx = states.indexOf(state);\n\n if (idx != -1) {\n\n break;\n }\n\n states.add(state);\n\n if (i > 0) {\n move(shells, i);\n }\n }\n\n int cycleLength = states.size();\n int r = n % cycleLength;\n\n System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class ShellGame {\n- public static void main(String[] args) {\n- Scanner nw = new Scanner(System.in);\n- int n = nw.nextInt();\n- int pos = nw.nextInt();\n- String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n- (n) %= elm.length;\n- System.out.println(elm[n].charAt(pos));\n+public class Main {\n+ static void move(int[] shells, int i) {\n+ int a, b;\n+\n+ if (i % 2 == 0) {\n+ a = 1;\n+ b = 2;\n+ } else {\n+ a = 0;\n+ b = 1;\n+ }\n+\n+ int tmp = shells[a];\n+ shells[a] = shells[b];\n+ shells[b] = tmp;\n+ }\n+\n+ static String getState(int[] shells, int i) {\n+ String state = Integer.toString(i % 2);\n+\n+ state += Integer.toString(shells[0]);\n+ state += Integer.toString(shells[1]);\n+ state += Integer.toString(shells[2]);\n+\n+ return state;\n+ }\n+\n+ public static void main(String[] args) throws java.lang.Exception {\n+ Scanner in = new Scanner(System.in);\n+\n+ int n = in.nextInt();\n+ int x = in.nextInt();\n+\n+ int[] shells = new int[3];\n+ shells[x] = 1;\n+\n+ ArrayList states = new ArrayList<>();\n+\n+ for (int i = n; i >= 0; i--) {\n+ String state = getState(shells, i);\n+\n+ int idx = states.indexOf(state);\n+\n+ if (idx != -1) {\n+\n+ break;\n+ }\n+\n+ states.add(state);\n+\n+ if (i > 0) {\n+ move(shells, i);\n+ }\n+ }\n+\n+ int cycleLength = states.size();\n+ int r = n % cycleLength;\n+\n+ System.out.println(states.get(r).substring(1).indexOf(\"1\"));\n }\n }", "output": "SLOWER 0.0056", "pair_id": "java_429_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0039} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n- }\n-\n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n- }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "FASTER 1.0915", "pair_id": "java_4724_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 2.131} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.util.Scanner;\n \n public class B {\n \n- static long N;\n+ private static long N;\n+ private static long LAST;\n \n public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n+ LAST = N * N / 2 + (N & 1);\n \n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n+ }\n \n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n }\n }\n }\n \n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n+ private static long number(long i, long j) {\n \n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n \n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n- }\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 1.3152", "pair_id": "java_5799_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 2.4884} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class BNumbersOnTheChessboard {\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n long n = in.nextLong();\n int q = in.nextInt();\n long nn = n * n;\n long nn2 = nn / 2 + nn % 2;\n for (int i = 0; i < q; i++) {\n long x = in.nextLong();\n long y = in.nextLong();\n long ans;\n if ((x + y) % 2 == 0) {\n ans = 0;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += (y + 1) / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n }\n out.println(ans);\n } else {\n ans = nn2;\n if (x % 2 == 1) {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x / 2);\n }\n ans += y / 2;\n } else {\n if (n % 2 == 0) {\n ans += (x - 1) * (n / 2);\n } else {\n ans += (x - 1) * (n / 2) + (x - 1) / 2;\n }\n ans += (y + 1) / 2;\n }\n out.println(ans);\n }\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader br;\n private StringTokenizer st;\n\n public FastScanner(InputStream inputStream) {\n br = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- BNumbersOnTheChessboard solver = new BNumbersOnTheChessboard();\n- solver.solve(1, in, out);\n- out.close();\n+public class NumbersOnTheChessboard {\n+ private static final boolean debug = false;\n+\n+ public static void main(String args[]) throws Exception {\n+ BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n+ String[] S = bro.readLine().split(\" \");\n+ long n = Long.parseLong(S[0]);\n+ int q = Integer.parseInt(S[1]);\n+ for (int i = 0; i < q; i++) {\n+ S = bro.readLine().split(\" \");\n+ long x = Long.parseLong(S[0]);\n+ long y = Long.parseLong(S[1]);\n+\n+ System.out.println(solve(x, y, n));\n+ }\n }\n \n- static class BNumbersOnTheChessboard {\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- long n = in.nextLong();\n- int q = in.nextInt();\n- long nn = n * n;\n- long nn2 = nn / 2 + nn % 2;\n- for (int i = 0; i < q; i++) {\n- long x = in.nextLong();\n- long y = in.nextLong();\n- long ans;\n- if ((x + y) % 2 == 0) {\n- ans = 0;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += (y + 1) / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n+ static long solve(long x, long y, long n) {\n+ long rowSum = 0;\n+ long sq = 0;\n+ if (n % 2 == 0) sq = n * n / 2;\n+ else sq = (n * n + 1) / 2;\n+ if (n % 2 == 0) {\n+ if ((x + y) % 2 == 0) {\n+ rowSum = (n * (x - 1) / 2);\n+ } else {\n+ rowSum = sq + ((n * (x - 1)) / 2);\n+ }\n+ } else {\n+ if ((x + y) % 2 == 0) {\n+ if (x % 2 != 0) {\n+ rowSum = ((x - 1) / 2) * (n);\n+ } else {\n+ rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n+ }\n+ } else {\n+ if (x % 2 != 0) {\n+\n+ rowSum = sq + (n * (x - 1) / 2);\n+ if (debug) {\n+ System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n- out.println(ans);\n } else {\n- ans = nn2;\n- if (x % 2 == 1) {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x / 2);\n- }\n- ans += y / 2;\n- } else {\n- if (n % 2 == 0) {\n- ans += (x - 1) * (n / 2);\n- } else {\n- ans += (x - 1) * (n / 2) + (x - 1) / 2;\n- }\n- ans += (y + 1) / 2;\n- }\n- out.println(ans);\n+ rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n- }\n-\n- static class FastScanner {\n- private BufferedReader br;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream inputStream) {\n- br = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n+ return rowSum + (long) Math.ceil((double) y / 2);\n }\n }", "output": "SLOWER 0.7785", "pair_id": "java_5769_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7153} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Test {\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n \n- private static Scanner s;\n- public static int[] arr;\n- public static int[] a = new int[3];\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n \n- public static void main(String[] args) {\n- s = new Scanner(System.in);\n- int[] x_a = new int[4];\n- int[] y_a = new int[4];\n- int[] x = new int[2];\n- x[0] = Integer.MAX_VALUE;\n- x[1] = Integer.MIN_VALUE;\n- int[] y = new int[2];\n- y[0] = Integer.MAX_VALUE;\n- y[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- x_a[i] = s.nextInt();\n- y_a[i] = s.nextInt();\n- x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n- x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n- y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n- y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n }\n- int[] x_b = new int[4];\n- int[] y_b = new int[4];\n- for (int i = 0; i < 4; i++) {\n- x_b[i] = s.nextInt();\n- y_b[i] = s.nextInt();\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n }\n- boolean ans = false;\n- for (int i = 0; i < 4; i++) {\n- int tmpX = x_b[i];\n- int tmpY = y_b[i];\n- if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n }\n- if (ans) {\n- System.out.println(\"Yes\");\n- } else {\n- int[] tmpx = new int[4];\n- int[] tmpy = new int[4];\n- int[] tmpx_b = new int[4];\n- int[] tmpy_b = new int[4];\n- int[] x1 = new int[2];\n- x1[0] = Integer.MAX_VALUE;\n- x1[1] = Integer.MIN_VALUE;\n- int[] y1 = new int[2];\n- y1[0] = Integer.MAX_VALUE;\n- y1[1] = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- tmpx[i] = x_a[i] + y_a[i];\n- tmpy[i] = x_a[i] - y_a[i];\n- tmpx_b[i] = x_b[i] + y_b[i];\n- tmpy_b[i] = x_b[i] - y_b[i];\n \n- x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n- x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n- y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n- y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n- }\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n \n- for (int i = 0; i < 4; i++) {\n- int tmpX = tmpx[i];\n- int tmpY = tmpy[i];\n- if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n- else {\n- ans = true;\n- break;\n- }\n- }\n- if (ans) System.out.println(\"Yes\");\n- else {\n- int midx = (x_b[0] + x_b[2]) / 2;\n- int midy = (y_b[0] + y_b[2]) / 2;\n- if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n- System.out.println(\"No\");\n- } else {\n- ans = true;\n- System.out.println(\"Yes\");\n- }\n- }\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n }\n }\n \n- public static class knights {\n- public int str;\n- public long coins;\n- public long maxCoins;\n-\n- public knights(int strength) {\n- this.str = strength;\n- this.coins = 0;\n- this.maxCoins = 0;\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n }\n \n- public void setCoins(long money) {\n- this.coins = money;\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n+ out.close();\n }\n \n- public static int maxribbons(int len) {\n- if (len == 0) return 0;\n- if (arr[len] != 0) return arr[len];\n- if (len < a[0]) return Integer.MIN_VALUE;\n- return (arr[len] =\n- Math.max(\n- len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n- Math.max(\n- len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n- len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n- }\n-\n- public static class knightsComparator implements Comparator {\n-\n- @Override\n- public int compare(knights arg0, knights arg1) {\n- if (arg0.str < arg1.str) return -1;\n- else if (arg0.str > arg1.str) return 1;\n- else {\n- if (arg0.coins < arg1.coins) return -1;\n- else if (arg0.coins > arg1.coins) return 1;\n- else return 0;\n- }\n- }\n- }\n-\n- public static class duel {\n- public int x;\n- public int freq;\n-\n- public duel(int x, int y) {\n- this.x = x;\n- this.freq = y;\n- }\n- }\n-\n- public static int bracketSequenceConcat(String a, String b) {\n- int ans = 0;\n- boolean aflag = true, bflag = true;\n- Stack st = new Stack();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- aflag = false;\n- } else {\n- st.pop();\n- }\n- }\n- if (!st.isEmpty()) aflag = false;\n- System.out.println(aflag);\n- if (!aflag) b = a + b;\n- System.out.println(\"b :\" + b);\n- for (int i = 0; i < b.length(); i++) {\n- if (b.charAt(i) == '(') st.push('(');\n- else if (st.isEmpty()) {\n- bflag = false;\n- break;\n- } else {\n- st.pop();\n- }\n- System.out.println(st.size());\n- }\n- if (!st.isEmpty()) bflag = false;\n- System.out.println(bflag);\n- if (aflag && bflag) return 1;\n- else if (!aflag && bflag) return 1;\n- return ans;\n- }\n-\n- public static int cuttingRod(int[] a, int n) {\n- if (n <= 0) return 0;\n- int ans = Integer.MIN_VALUE;\n- for (int i = 0; i < n; i++) {\n- ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n- }\n- return ans;\n- }\n-\n- public static boolean isPrimeSqrt(int n) {\n- if (n <= 1) return false;\n- else if (n == 2 || n == 3) return true;\n- for (int i = 2; i <= Math.sqrt(n); i++) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-\n- public static int lcm(int a, int b) {\n- return (a * b) / gcd(a, b);\n- }\n-\n- public static int gcd(int a, int b) {\n- if (a == 0) return b;\n- if (b == 0) return a;\n- if (a % b == 0) return b;\n- else return gcd(b, a % b);\n- }\n-\n- public static boolean isPowerOfTwo(long a) {\n- long diff = a;\n- long test = 1;\n- while (test > 0) {\n- if (diff == (diff & test)) {\n- return true;\n- }\n- test = test << 1;\n- }\n- return false;\n- }\n-\n- public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n- if (l < r) {\n- int mid = l + (r - l) / 2;\n- if (target == a[mid]) return true;\n- else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n- else return boolBinarySearch(a, l, mid - 1, target);\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }", "output": "FASTER 3.6249", "pair_id": "java_4735_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 12.337} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Ideone {\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws java.lang.Exception {\n\n FastReader scan = new FastReader();\n long n = scan.nextLong();\n long q = scan.nextLong();\n for (long i = 0; i < q; i++) {\n long x = scan.nextLong();\n long y = scan.nextLong();\n long sum = x + y;\n long d = n * (x - 1) + y;\n long no = (d + 1) / 2;\n long m;\n if (n % 2 == 0) {\n m = (long) ((n * n) / 2);\n } else {\n m = (long) ((n * n) / 2 + 1);\n }\n if (sum % 2 == 0) {\n System.out.println(no);\n } else {\n\n System.out.println(m + no);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n-public class Ideone {\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n+public class Main {\n \n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n }\n- }\n- return st.nextToken();\n- }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n \n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n \n- long nextLong() {\n- return Long.parseLong(next());\n- }\n+ gone = gone + (j + 1) / 2;\n+ } else {\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ gone = gone + ((i - 1) / 2) * N;\n \n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n- }\n-\n- public static void main(String[] args) throws java.lang.Exception {\n-\n- FastReader scan = new FastReader();\n- long n = scan.nextLong();\n- long q = scan.nextLong();\n- for (long i = 0; i < q; i++) {\n- long x = scan.nextLong();\n- long y = scan.nextLong();\n- long sum = x + y;\n- long d = n * (x - 1) + y;\n- long no = (d + 1) / 2;\n- long m;\n- if (n % 2 == 0) {\n- m = (long) ((n * n) / 2);\n- } else {\n- m = (long) ((n * n) / 2 + 1);\n- }\n- if (sum % 2 == 0) {\n- System.out.println(no);\n- } else {\n-\n- System.out.println(m + no);\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n }\n }\n }", "output": "SLOWER 0.029", "pair_id": "java_5813_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.0203} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class NumbersontheChessboard {\n static class FastReader {\n BufferedReader bf;\n StringTokenizer st;\n\n public FastReader() {\n bf = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(bf.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = bf.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] s) {\n long n, a, b, i;\n int q;\n FastReader sc = new FastReader();\n n = sc.nextLong();\n long x;\n if (n % 2 == 0) {\n x = (n * n);\n x /= 2;\n } else {\n x = (n * n);\n x++;\n x /= 2;\n }\n q = sc.nextInt();\n for (i = 0; i < q; i++) {\n a = sc.nextLong();\n b = sc.nextLong();\n long sum = (((a - 1) * n) + b + 1);\n sum /= 2;\n if ((a + b) % 2 == 0) System.out.println(sum);\n else System.out.println((sum + x));\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class NumbersontheChessboard {\n+ static class FastReader {\n+ BufferedReader bf;\n+ StringTokenizer st;\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ public FastReader() {\n+ bf = new BufferedReader(new InputStreamReader(System.in));\n+ }\n \n- System.out.println(solve(x, y, n));\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(bf.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = bf.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n \n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n+ public static void main(String[] s) {\n+ long n, a, b, i;\n+ int q;\n+ FastReader sc = new FastReader();\n+ n = sc.nextLong();\n+ long x;\n if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n+ x = (n * n);\n+ x /= 2;\n } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n+ x = (n * n);\n+ x++;\n+ x /= 2;\n }\n- return rowSum + (long) Math.ceil((double) y / 2);\n+ q = sc.nextInt();\n+ for (i = 0; i < q; i++) {\n+ a = sc.nextLong();\n+ b = sc.nextLong();\n+ long sum = (((a - 1) * n) + b + 1);\n+ sum /= 2;\n+ if ((a + b) % 2 == 0) System.out.println(sum);\n+ else System.out.println((sum + x));\n+ }\n }\n }", "output": "FASTER 0.1251", "pair_id": "java_5809_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0906} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n String S = sc.next();\n sc.close();\n int r = -1;\n String s = \"\";\n long ans = 0;\n for (int l = 0; l < N; l++) {\n while (l - 1 > r) {\n r++;\n }\n while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n s += S.charAt(r + 1);\n r++;\n }\n ans = Math.max(r - l + 1, ans);\n if (s.length() >= 2) s = s.substring(1);\n else if (s.length() == 1) s = \"\";\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.HashMap;\n+import java.util.Random;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- String S = sc.next();\n- sc.close();\n- int r = -1;\n- String s = \"\";\n- long ans = 0;\n- for (int l = 0; l < N; l++) {\n- while (l - 1 > r) {\n- r++;\n+ Scanner scanner = new Scanner(System.in);\n+\n+ int N = scanner.nextInt();\n+ char[] s = scanner.next().toCharArray();\n+ int[] M = {999_999_937, 1_000_000_007};\n+ int B = new Random().nextInt(999_999_937);\n+ int left = 0;\n+ int right = N / 2 + 1;\n+ while (right - left > 1) {\n+ int mid = (left + right) / 2;\n+ if (possible(s, mid, N, B, M)) left = mid;\n+ else right = mid;\n+ }\n+ System.out.println(left);\n+ }\n+\n+ private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n+ long[] bn = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ bn[i] = 1;\n+ for (int j = 0; j < K - 1; j++) {\n+ bn[i] *= B;\n+ bn[i] %= M[i];\n }\n- while (r + 1 < N && S.lastIndexOf(s + S.charAt(r + 1)) > r + 1) {\n- s += S.charAt(r + 1);\n- r++;\n+ }\n+\n+ HashMap occurrences = new HashMap<>();\n+ long[] hash = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ hash[i] = hash(s, K, B, M[i]);\n+ }\n+ occurrences.put(new Tuple(hash), 0);\n+ for (int i = 1; i <= N - K; i++) {\n+ for (int j = 0; j < M.length; j++) {\n+ hash[j] -= s[i - 1] * bn[j] % M[j];\n+ if (hash[j] < 0) hash[j] += M[j];\n+ hash[j] *= B;\n+ hash[j] %= M[j];\n+ hash[j] += s[i + K - 1];\n+ if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n- ans = Math.max(r - l + 1, ans);\n- if (s.length() >= 2) s = s.substring(1);\n- else if (s.length() == 1) s = \"\";\n+ Tuple key = new Tuple(hash);\n+ if (occurrences.containsKey(key)) {\n+ if (occurrences.get(key) + K <= i) return true;\n+ } else occurrences.put(key, i);\n }\n- System.out.println(ans);\n+ return false;\n+ }\n+\n+ private static long hash(char[] s, int len, int B, int M) {\n+ if (s.length < len)\n+ throw new IllegalArgumentException(\n+ \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n+ long hash = 0;\n+ for (int i = 0; i < len; i++) {\n+ hash *= B;\n+ hash %= M;\n+ hash += s[i];\n+ if (hash >= M) hash -= M;\n+ }\n+ return hash;\n+ }\n+\n+ private static class Tuple {\n+ private final long[] elements;\n+\n+ private Tuple(long[] elements) {\n+ this.elements = Arrays.copyOf(elements, elements.length);\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Tuple tuple = (Tuple) o;\n+ return Arrays.equals(elements, tuple.elements);\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return Arrays.hashCode(elements);\n+ }\n }\n }", "output": "FASTER 0.3033", "pair_id": "java_3836_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.234} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int N = Integer.parseInt(sc.next());\n- String S = sc.next();\n- StringBuilder sb = new StringBuilder(S);\n- int ans = 0;\n- for (int i = 0; i < S.length(); i++) {\n- String S_tmp = sb.substring(i);\n- int[] z = z_algo(S_tmp);\n+ int num = Integer.parseInt(sc.next());\n+ String str = sc.next();\n \n- for (int j = 1; j < S.length() - i; j++) {\n- if (j >= z[j]) {\n- ans = Math.max(ans, z[j]);\n+ int res = 0;\n+ for (int len = num; len > 0; len--) {\n+ int[] dp = new int[num];\n+ for (int i = num - len - 1; i >= 0; i--) {\n+ if (str.charAt(i) == str.charAt(i + len)) {\n+ dp[i] = Math.min(dp[i + 1] + 1, len);\n+ res = Math.max(res, dp[i]);\n+ } else {\n+ dp[i] = 0;\n }\n }\n }\n- System.out.println(ans);\n- }\n \n- public static int[] z_algo(String S) {\n- int N = S.length();\n- int[] A = new int[N];\n- A[0] = N;\n- int i = 1;\n- int j = 0;\n- while (i < N) {\n- while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n- j++;\n- }\n- A[i] = j;\n- if (j == 0) {\n- i++;\n- continue;\n- }\n- int k = 1;\n- while (i + k < N && k + A[k] < j) {\n- A[i + k] = A[k];\n- k++;\n- }\n- i += k;\n- j -= k;\n- }\n- return A;\n+ System.out.println(res);\n }\n }", "output": "FASTER 0.3859", "pair_id": "java_3833_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.3067} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n+public class C {\n+ static class Point {\n+ int x, y;\n+\n+ public Point(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public int getX() {\n+ return x;\n+ }\n+\n+ public int getY() {\n+ return y;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Point point = (Point) o;\n+ return x == point.x && y == point.y;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+\n+ return Objects.hash(x, y);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return x + \",\" + y;\n+ }\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n+ static class Square {\n+ List points = new ArrayList<>();\n+ }\n \n- pair(double a, double b) {\n- x = a;\n- y = b;\n+ public static void main(String[] args) {\n+ FastScanner scanner = new FastScanner();\n+\n+ Square A = readSquare(scanner);\n+ Square B = readSquare(scanner);\n+\n+ Set regions = new HashSet<>();\n+ Point center = center(B);\n+ draw(regions, B.points.get(0), B.points.get(1), center);\n+ draw(regions, B.points.get(1), B.points.get(2), center);\n+ draw(regions, B.points.get(2), B.points.get(3), center);\n+ draw(regions, B.points.get(3), B.points.get(0), center);\n+\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+\n+ for (int x = minx; x <= maxx; ++x) {\n+ for (int y = miny; y <= maxy; ++y) {\n+ if (regions.contains(new Point(x, y))) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n }\n \n- pair a[][] = new pair[2][4];\n+ System.out.println(\"NO\");\n+ }\n \n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n+ private static Point center(Square A) {\n+ int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n+ int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n+ int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n+ int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n+ int midx = 0;\n+ int midy = 0;\n+ for (Point p : A.points) {\n+ if (p.x != minx && p.x != maxx) {\n+ midx = p.x;\n+ break;\n }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+ }\n+ for (Point p : A.points) {\n+ if (p.y != miny && p.y != maxy) {\n+ midy = p.y;\n+ break;\n+ }\n+ }\n+ return new Point(midx, midy);\n+ }\n \n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n+ static void draw(Set regions, Point a, Point b, Point c) {\n+ List xs = new ArrayList<>();\n+ List ys = new ArrayList<>();\n+ if (a.x < b.x) {\n+ for (int x = a.x; x <= b.x; ++x) {\n+ xs.add(x);\n+ }\n+ } else {\n+ for (int x = a.x; x >= b.x; --x) {\n+ xs.add(x);\n+ }\n+ }\n+ if (a.y < b.y) {\n+ for (int y = a.y; y <= b.y; ++y) {\n+ ys.add(y);\n+ }\n+ } else {\n+ for (int y = a.y; y >= b.y; --y) {\n+ ys.add(y);\n+ }\n }\n \n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n+ for (int i = 0; i < xs.size(); ++i) {\n+ regions.add(new Point(xs.get(i), ys.get(i)));\n+ for (int xx = xs.get(i); xx <= c.x; ++xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n+ for (int xx = xs.get(i); xx >= c.x; --xx) {\n+ regions.add(new Point(xx, ys.get(i)));\n }\n- out.print(\"NO\");\n }\n }\n \n- static class InputReader {\n+ private static Square readSquare(FastScanner scanner) {\n+ Square A = new Square();\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n+ return A;\n+ }\n+\n+ public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n \n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n+ public FastScanner() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n+ while (st == null || !st.hasMoreElements()) {\n try {\n- s = br.readLine();\n+ st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n \n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n+ int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() {\n+ long nextLong() {\n return Long.parseLong(next());\n }\n \n- public double nextDouble() {\n+ double nextDouble() {\n return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n }\n }\n }", "output": "SLOWER 2.3895", "pair_id": "java_4741_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 5.2397} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] argc) {\n Scanner sc = new Scanner(System.in);\n int x = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n\n System.out.println((x - a) % b);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] argc) {\n+ Scanner sc = new Scanner(System.in);\n+ int x = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int X = sc.nextInt();\n- int A = sc.nextInt();\n- int B = sc.nextInt();\n- System.out.println((X - A) % B);\n+ System.out.println((x - a) % b);\n }\n }", "output": "FASTER 0.0111", "pair_id": "java_6641_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.0077} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.IOException;\n import java.util.*;\n \n-public class triangulation {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+public class Main {\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n }\n- out.println(sum);\n- out.close();\n+ }\n+\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1072", "pair_id": "java_216_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0771} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.IntBinaryOperator;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n StringBuilder out = new StringBuilder();\n PrintWriter pw = new PrintWriter(System.out);\n final int N = nextInt(sc);\n final int Q = nextInt(sc);\n\n IntDualSegmentTree t =\n new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n for (int j = 0; j < Q; j++) {\n int q = nextInt(sc);\n switch (q) {\n case 0:\n int l = nextInt(sc);\n int r = nextInt(sc) + 1;\n int x = nextInt(sc);\n t.apply(l, r, x);\n break;\n case 1:\n int i = nextInt(sc);\n out.append(t.get(i)).append('\\n');\n break;\n default:\n break;\n }\n }\n sc.close();\n pw.write(out.toString());\n pw.flush();\n pw.close();\n }\n\n public static int nextInt(Scanner sc) {\n return Integer.parseInt(sc.next());\n }\n\n public static long nextLong(Scanner sc) {\n return Long.parseLong(sc.next());\n }\n}\n\nclass IntDualSegmentTree {\n\n final int[] Dat;\n\n final int[] Laz;\n\n final int N;\n\n final int L;\n\n final int E1;\n\n final IntBinaryOperator G;\n\n final IntBinaryOperator H;\n\n final int[] Stack = new int[64];\n\n public IntDualSegmentTree(\n int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n Arrays.fill(Dat, initialValue);\n Arrays.fill(Laz, e1);\n }\n\n public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n this.E1 = e1;\n this.G = g;\n this.H = h;\n int n = src.length;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.L = n;\n this.Dat = new int[k];\n this.Laz = new int[k << 1];\n System.arraycopy(src, 0, Dat, 0, src.length);\n Arrays.fill(Laz, e1);\n }\n\n public void apply(int l, int r, int v) {\n if (l < 0 || l > L || r < 0 || r > L) {\n throw new IndexOutOfBoundsException(\n String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n }\n if (l >= r) return;\n updown(l, r);\n l += N;\n r += N;\n for (; l < r; l >>= 1, r >>= 1) {\n if ((l & 1) != 0) {\n Laz[l] = H.applyAsInt(Laz[l], v);\n l++;\n }\n if ((r & 1) != 0) {\n r--;\n Laz[r] = H.applyAsInt(Laz[r], v);\n }\n }\n }\n\n public int get(int i) {\n if (i < 0 || i >= L) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n }\n int k = 1;\n int l = 0, r = N;\n while (k < N) {\n propagate(k);\n int kl = k << 1 | 0;\n int kr = k << 1 | 1;\n int m = (l + r) >> 1;\n if (m > i) {\n r = m;\n k = kl;\n } else {\n l = m;\n k = kr;\n }\n }\n propagate(k);\n return Dat[k - N];\n }\n\n void updown(int l, int r) {\n int i = 0;\n int kl = l + N, kr = r + N;\n for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n 0 < kl && kl < kr;\n kl >>= 1, kr >>= 1) {\n if (kl <= x) Stack[i++] = kl;\n if (kr <= y) Stack[i++] = kr;\n }\n for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n while (i > 0) propagate(Stack[--i]);\n }\n\n void propagate(int k) {\n int lz = Laz[k];\n if (lz != E1) {\n if (k < N) {\n int l = k << 1 | 0, r = k << 1 | 1;\n Laz[l] = H.applyAsInt(Laz[l], lz);\n Laz[r] = H.applyAsInt(Laz[r], lz);\n } else {\n Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n }\n Laz[k] = E1;\n }\n }\n\n public static void main(String[] args) {\n int[] a = {0, 1, 2, 3, 4, 5};\n IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n System.out.println(t1);\n t1.apply(0, 3, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n t1.apply(2, 4, 10);\n System.out.println(t1);\n System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.IntBinaryOperator;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n+\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n+ } else {\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n+ }\n+ }\n+ }\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- StringBuilder out = new StringBuilder();\n- PrintWriter pw = new PrintWriter(System.out);\n- final int N = nextInt(sc);\n- final int Q = nextInt(sc);\n-\n- IntDualSegmentTree t =\n- new IntDualSegmentTree(N, Integer.MAX_VALUE, -1, (u, v) -> v, (u, v) -> v);\n- for (int j = 0; j < Q; j++) {\n- int q = nextInt(sc);\n- switch (q) {\n- case 0:\n- int l = nextInt(sc);\n- int r = nextInt(sc) + 1;\n- int x = nextInt(sc);\n- t.apply(l, r, x);\n- break;\n- case 1:\n- int i = nextInt(sc);\n- out.append(t.get(i)).append('\\n');\n- break;\n- default:\n- break;\n- }\n- }\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n sc.close();\n- pw.write(out.toString());\n- pw.flush();\n- pw.close();\n- }\n-\n- public static int nextInt(Scanner sc) {\n- return Integer.parseInt(sc.next());\n- }\n-\n- public static long nextLong(Scanner sc) {\n- return Long.parseLong(sc.next());\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n+ }\n }\n }\n-\n-class IntDualSegmentTree {\n-\n- final int[] Dat;\n-\n- final int[] Laz;\n-\n- final int N;\n-\n- final int L;\n-\n- final int E1;\n-\n- final IntBinaryOperator G;\n-\n- final IntBinaryOperator H;\n-\n- final int[] Stack = new int[64];\n-\n- public IntDualSegmentTree(\n- int n, int initialValue, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- Arrays.fill(Dat, initialValue);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public IntDualSegmentTree(int[] src, int e1, IntBinaryOperator g, IntBinaryOperator h) {\n- this.E1 = e1;\n- this.G = g;\n- this.H = h;\n- int n = src.length;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.L = n;\n- this.Dat = new int[k];\n- this.Laz = new int[k << 1];\n- System.arraycopy(src, 0, Dat, 0, src.length);\n- Arrays.fill(Laz, e1);\n- }\n-\n- public void apply(int l, int r, int v) {\n- if (l < 0 || l > L || r < 0 || r > L) {\n- throw new IndexOutOfBoundsException(\n- String.format(\"Segment [%d, %d) is not in [%d, %d)\", l, r, 0, L));\n- }\n- if (l >= r) return;\n- updown(l, r);\n- l += N;\n- r += N;\n- for (; l < r; l >>= 1, r >>= 1) {\n- if ((l & 1) != 0) {\n- Laz[l] = H.applyAsInt(Laz[l], v);\n- l++;\n- }\n- if ((r & 1) != 0) {\n- r--;\n- Laz[r] = H.applyAsInt(Laz[r], v);\n- }\n- }\n- }\n-\n- public int get(int i) {\n- if (i < 0 || i >= L) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d)\", i, 0, L));\n- }\n- int k = 1;\n- int l = 0, r = N;\n- while (k < N) {\n- propagate(k);\n- int kl = k << 1 | 0;\n- int kr = k << 1 | 1;\n- int m = (l + r) >> 1;\n- if (m > i) {\n- r = m;\n- k = kl;\n- } else {\n- l = m;\n- k = kr;\n- }\n- }\n- propagate(k);\n- return Dat[k - N];\n- }\n-\n- void updown(int l, int r) {\n- int i = 0;\n- int kl = l + N, kr = r + N;\n- for (int x = kl / (kl & -kl) >> 1, y = kr / (kr & -kr) >> 1;\n- 0 < kl && kl < kr;\n- kl >>= 1, kr >>= 1) {\n- if (kl <= x) Stack[i++] = kl;\n- if (kr <= y) Stack[i++] = kr;\n- }\n- for (; kl > 0; kl >>= 1) Stack[i++] = kl;\n- while (i > 0) propagate(Stack[--i]);\n- }\n-\n- void propagate(int k) {\n- int lz = Laz[k];\n- if (lz != E1) {\n- if (k < N) {\n- int l = k << 1 | 0, r = k << 1 | 1;\n- Laz[l] = H.applyAsInt(Laz[l], lz);\n- Laz[r] = H.applyAsInt(Laz[r], lz);\n- } else {\n- Dat[k - N] = G.applyAsInt(Dat[k - N], lz);\n- }\n- Laz[k] = E1;\n- }\n- }\n-\n- public static void main(String[] args) {\n- int[] a = {0, 1, 2, 3, 4, 5};\n- IntDualSegmentTree t1 = new IntDualSegmentTree(a, 0, (u, v) -> u + v, (u, v) -> u + v);\n- System.out.println(t1);\n- t1.apply(0, 3, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- t1.apply(2, 4, 10);\n- System.out.println(t1);\n- System.out.printf(\"\\na[2] = %d \\n\\n\", t1.get(2));\n- }\n-}", "output": "FASTER 0.9388", "pair_id": "java_5730_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.9169} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n out.close();\n }\n \n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n }\n }\n- return true;\n+\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n+ }\n+ }\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n+ }\n }\n \n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n+ }\n \n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "SLOWER 1.9366", "pair_id": "java_4694_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 3.8279} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n+public class helloWorld {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n \n- public static void main(String[] args) {\n- int n = in.nextInt();\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n \n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n- }\n-\n- out.println(weight);\n+ System.out.println(ans);\n \n in.close();\n- out.close();\n }\n }", "output": "FASTER 0.0082", "pair_id": "java_212_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0057} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class helloWorld {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n int ans = 0;\n\n for (int i = 2; i < n; i++) ans += i * (i + 1);\n\n System.out.println(ans);\n\n in.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class JavaApplication42 {\n+public class helloWorld {\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ int ans = 0;\n \n- public static void main(String[] args) {\n+ for (int i = 2; i < n; i++) ans += i * (i + 1);\n \n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n- }\n- System.out.println(sum);\n+ System.out.println(ans);\n+\n+ in.close();\n }\n }", "output": "SLOWER 0.0228", "pair_id": "java_205_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0159} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n+ TaskE solver = new TaskE();\n solver.solve(1, in, out);\n+ out.flush();\n out.close();\n }\n \n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n+ static class TaskE {\n+ class pair {\n+ double x, y;\n+\n+ pair(double a, double b) {\n+ x = a;\n+ y = b;\n+ }\n }\n \n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n+ pair a[][] = new pair[2][4];\n+\n+ boolean chk(double x, double y) {\n+ if (a[0][0].x == a[0][1].x) {\n+ if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n+ return false;\n+ } else {\n+ if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n+ return false;\n+ }\n+ double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n+ double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n+\n+ if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n+ || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n+ return false;\n+ return true;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ for (int i = 0; i < 2; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n- return false;\n+\n+ for (int i = -100; i <= 100; i++) {\n+ for (int j = -100; j <= 100; j++) {\n+ if (chk(i, j)) {\n+ out.print(\"YES\");\n+ return;\n+ }\n+ }\n+ }\n+ out.print(\"NO\");\n }\n }\n \n static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n }\n \n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n+ return st.nextToken();\n }\n \n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n+ }\n+ return true;\n }\n \n public int nextInt() {\n return Integer.parseInt(next());\n }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n }\n }", "output": "FASTER 4.0502", "pair_id": "java_4745_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 16.566} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] arg) {\n Scanner in = new Scanner(System.in);\n char[][] numbers = new char[100][];\n int[] eqVal = new int[100];\n for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n int m = in.nextInt();\n for (int i = 0; i < n; i++) {\n numbers[i] = in.next().toCharArray();\n eqVal[i] = in.nextInt();\n }\n int val = 0;\n for (int i = 0; i < m; i++) {\n char[] hNum = in.next().toCharArray();\n for (int index = 0; index < n; index++) {\n boolean isMuch = true;\n for (int keta = 0; keta < 8; keta++) {\n if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n isMuch = false;\n break;\n }\n }\n if (isMuch) {\n val += eqVal[index];\n break;\n }\n }\n }\n System.out.println(val);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n while (true) {\n int n = sc.nextInt();\n int m = sc.nextInt();\n if (n == 0 && m == 0) break;\n\n String[] a = new String[n];\n int[] b = new int[n];\n\n for (int i = 0; i < n; i++) {\n a[i] = sc.next();\n b[i] = sc.nextInt();\n }\n\n int sum = 0;\n int c = 0;\n String s = \"\";\n\n for (int i = 0; i < m; i++) {\n s = sc.next();\n for (int j = 0; j < n; j++) {\n c = 0;\n while (a[j].codePointAt(c) == 42) c++;\n if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n System.out.println(sum);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] arg) {\n- Scanner in = new Scanner(System.in);\n- char[][] numbers = new char[100][];\n- int[] eqVal = new int[100];\n- for (int n = in.nextInt(); n > 0; n = in.nextInt()) {\n- int m = in.nextInt();\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+\n+ while (true) {\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ if (n == 0 && m == 0) break;\n+\n+ String[] a = new String[n];\n+ int[] b = new int[n];\n+\n for (int i = 0; i < n; i++) {\n- numbers[i] = in.next().toCharArray();\n- eqVal[i] = in.nextInt();\n+ a[i] = sc.next();\n+ b[i] = sc.nextInt();\n }\n- int val = 0;\n+\n+ int sum = 0;\n+ int c = 0;\n+ String s = \"\";\n+\n for (int i = 0; i < m; i++) {\n- char[] hNum = in.next().toCharArray();\n- for (int index = 0; index < n; index++) {\n- boolean isMuch = true;\n- for (int keta = 0; keta < 8; keta++) {\n- if (numbers[index][keta] != '*' && hNum[keta] != numbers[index][keta]) {\n- isMuch = false;\n- break;\n- }\n- }\n- if (isMuch) {\n- val += eqVal[index];\n- break;\n- }\n+ s = sc.next();\n+ for (int j = 0; j < n; j++) {\n+ c = 0;\n+ while (a[j].codePointAt(c) == 42) c++;\n+ if (a[j].substring(c, 8).compareTo(s.substring(c, 8)) == 0) sum += b[j];\n }\n }\n- System.out.println(val);\n+ System.out.println(sum);\n }\n }\n }", "output": "SLOWER 0.1431", "pair_id": "java_1001_reversed", "problem_id": "p01322", "language": "java", "direction": "reversed", "speedup_ratio": 1.1043} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.Locale;\nimport java.util.StringTokenizer;\n\npublic class ER49B {\n static StringTokenizer st;\n static BufferedReader br;\n static PrintWriter pw;\n\n static class sort implements Comparable {\n int a, b, c;\n\n public sort(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n public int compareTo(sort arg0) {\n if (this.c == arg0.c) return 0;\n else if (this.c > arg0.c) return 1;\n else return -1;\n }\n }\n\n public static void main(String[] args) throws IOException {\n Locale.setDefault(Locale.US);\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n\n long n = nextLong();\n int q = nextInt();\n\n for (int i = 0; i < q; i++) {\n long xi = nextLong(), yi = nextLong();\n long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n if (n % 2 == 1) {\n ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n if ((xi + yi) % 2 == 0) {\n ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n }\n }\n\n if ((xi + yi) % 2 == 1) {\n ans += (n * n + 1) / 2;\n }\n pw.println(ans);\n }\n\n pw.close();\n }\n\n private static void gfile() throws IOException {\n br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n }\n\n private static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n private static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n private static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n private static String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.File;\n+import java.io.FileReader;\n+import java.io.FileWriter;\n import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.Locale;\n+import java.util.StringTokenizer;\n \n-public class Main {\n+public class ER49B {\n+ static StringTokenizer st;\n+ static BufferedReader br;\n+ static PrintWriter pw;\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ static class sort implements Comparable {\n+ int a, b, c;\n \n- String[] split1 = br.readLine().split(\" \");\n- long N = Integer.parseInt(split1[0]);\n- long Q = Integer.parseInt(split1[1]);\n+ public sort(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n \n- long diff = ((N * N) + 1) / 2;\n-\n- for (int k = 0; k < Q; k++) {\n- String[] split = br.readLine().split(\" \");\n- long i = Integer.parseInt(split[0]);\n- long j = Integer.parseInt(split[1]);\n-\n- long sum = i + j;\n- if (sum % 2 == 0) {\n- long gone = 0;\n-\n- if (i % 2 == 0) {\n- gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n-\n- gone = gone + j / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2 * N);\n-\n- gone = gone + (j + 1) / 2;\n- }\n- System.out.println(gone);\n- } else {\n- long gone = diff;\n- if (i % 2 == 0) {\n-\n- gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n-\n- gone = gone + (j + 1) / 2;\n- } else {\n-\n- gone = gone + ((i - 1) / 2) * N;\n-\n- gone = gone + j / 2;\n- }\n- System.out.println(gone);\n- }\n+ public int compareTo(sort arg0) {\n+ if (this.c == arg0.c) return 0;\n+ else if (this.c > arg0.c) return 1;\n+ else return -1;\n }\n }\n+\n+ public static void main(String[] args) throws IOException {\n+ Locale.setDefault(Locale.US);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+\n+ long n = nextLong();\n+ int q = nextInt();\n+\n+ for (int i = 0; i < q; i++) {\n+ long xi = nextLong(), yi = nextLong();\n+ long ans = ((n + 1) / 2) * (xi - 1) + (yi + 1) / 2;\n+ if (n % 2 == 1) {\n+ ans = ((n + 1) / 2) * ((xi - 1) / 2) + (n / 2) * (xi / 2) + (yi + 1) / 2;\n+ if ((xi + yi) % 2 == 0) {\n+ ans = ((n + 1) / 2) * (xi / 2) + (n / 2) * ((xi - 1) / 2) + (yi + 1) / 2;\n+ }\n+ }\n+\n+ if ((xi + yi) % 2 == 1) {\n+ ans += (n * n + 1) / 2;\n+ }\n+ pw.println(ans);\n+ }\n+\n+ pw.close();\n+ }\n+\n+ private static void gfile() throws IOException {\n+ br = new BufferedReader(new FileReader(new File(\"input.txt\")));\n+ pw = new PrintWriter(new BufferedWriter(new FileWriter(new File(\"output.txt\"))));\n+ }\n+\n+ private static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ private static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ private static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ private static String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n }", "output": "FASTER 0.7048", "pair_id": "java_5757_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.6299} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int INF = Integer.MAX_VALUE;\n static int n = 1;\n static int[] D;\n static int[] M;\n static int[] arr;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n1 = sc.nextInt();\n int op_num = sc.nextInt();\n String[] op = new String[op_num + 1];\n for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n\n init(n1);\n arr = new int[op_num];\n\n for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n String[] Split = op[i].split(\" \");\n int x, y, z;\n if (Integer.parseInt(Split[0]) == 0) {\n x = Integer.parseInt(Split[1]);\n y = Integer.parseInt(Split[2]);\n z = Integer.parseInt(Split[3]);\n arr[i1] = z;\n update(x, y + 1, 0, 0, n, mark);\n } else {\n x = Integer.parseInt(Split[1]);\n int result = find(x + n - 1, n);\n System.out.println(result);\n }\n i1++;\n mark++;\n }\n }\n\n private static int find(int n1, int n2) {\n\n int max = n1;\n for (int i = 0; n1 > 0; i++) {\n n1 = (n1 - 1) / 2;\n if (M[max] < M[n1]) max = n1;\n }\n int temp;\n if (M[max] == -1) temp = INF;\n else temp = arr[M[max]];\n\n return temp;\n }\n\n public static void update(int a, int b, int k, int l, int r, int mark) {\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n M[k] = mark;\n return;\n }\n update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n }\n\n public static void init(int N) {\n\n n = 1;\n while (n < N) n *= 2;\n D = new int[n * 2 - 1];\n M = new int[n * 2 - 1];\n for (int i = 0; i < n * 2 - 1; i++) {\n D[i] = INF;\n M[i] = -1;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- private static final int INF = Integer.MAX_VALUE;\n- static int n = 1;\n- static int[] D;\n- static int[] M;\n- static int[] arr;\n+\n+ static FastScanner sc = new FastScanner();\n+ static PrintStream out = System.out;\n+ static PrintWriter pw = new PrintWriter(out);\n+\n+ static final int[] dx = {0, 1, 0, -1};\n+ static final int[] dy = {-1, 0, 1, 0};\n+\n+ static final long MOD = (long) (1e9 + 7);\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ public static class Solver {\n+ public Solver() {\n+\n+ int n = sc.nextInt();\n+ int q = sc.nextInt();\n+\n+ long[] a = new long[n];\n+ Arrays.fill(a, (1 << 31) - 1);\n+\n+ SegmentTree seg = new SegmentTree(a);\n+\n+ for (int i = 0; i < q; i++) {\n+ int com = sc.nextInt();\n+ if (com == 0) {\n+ seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ } else {\n+ int index = sc.nextInt();\n+ out.println(seg.query(index, index + 1).val);\n+ }\n+ }\n+ }\n+\n+ public static class SegmentTree {\n+\n+ static final long INF = Long.MAX_VALUE / 2;\n+\n+ Node[] tree;\n+ int N = 1;\n+ int size;\n+ Node initialNode;\n+\n+ public static class Node {\n+ static long initialVal = 0;\n+ static long initialLazy = 0;\n+ long val;\n+ long lazy;\n+ boolean isLazy;\n+\n+ public Node() {\n+ val = initialVal;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node(long val) {\n+ this.val = val;\n+ lazy = initialLazy;\n+ }\n+\n+ public Node operation(Node nl, Node nr) {\n+ val = nl.val + nr.val;\n+ return this;\n+ }\n+\n+ public void prop(Node par) {\n+ if (!par.isLazy) return;\n+ lazy = par.lazy / 2;\n+ isLazy = true;\n+ }\n+\n+ public void prop(long x, int l, int r) {\n+ lazy = x * (r - l);\n+ isLazy = true;\n+ }\n+\n+ public void update() {\n+ if (!isLazy) return;\n+ val = lazy;\n+ lazy = initialLazy;\n+ isLazy = false;\n+ }\n+ }\n+\n+ public void update(int k, long x) {\n+ k += N - 1;\n+ tree[k] = new Node(x);\n+\n+ while (k != 0) {\n+ k = parent(k);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ private void prop(int k) {\n+ if (childL(k) < size) {\n+ tree[childL(k)].prop(tree[k]);\n+ tree[childR(k)].prop(tree[k]);\n+ }\n+ tree[k].update();\n+ }\n+\n+ public void put(int a, int b, long x) {\n+ put(a, b, 0, 0, N, x);\n+ }\n+\n+ private void put(int a, int b, int k, int l, int r, long x) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return;\n+ if (a <= l && r <= b) {\n+ tree[k].prop(x, l, r);\n+ prop(k);\n+ } else {\n+ put(a, b, childL(k), l, (l + r) / 2, x);\n+ put(a, b, childR(k), (l + r) / 2, r, x);\n+ tree[k].operation(tree[childL(k)], tree[childR(k)]);\n+ }\n+ }\n+\n+ public SegmentTree(long[] A) {\n+ initialNode = new Node();\n+\n+ while (N < A.length) N *= 2;\n+\n+ size = N * 2 - 1;\n+ tree = new Node[size];\n+\n+ for (int i = 0; i < size; i++) {\n+ tree[i] = new Node();\n+ }\n+\n+ for (int i = 0; i < A.length; i++) {\n+ update(i, A[i]);\n+ }\n+ }\n+\n+ public Node query(int a, int b) {\n+ return query(a, b, 0, 0, N);\n+ }\n+\n+ private Node query(int a, int b, int k, int l, int r) {\n+ prop(k);\n+\n+ if (r <= a || b <= l) return initialNode;\n+ if (a <= l && r <= b) return tree[k];\n+\n+ return new Node()\n+ .operation(\n+ query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n+ }\n+\n+ private int parent(int k) {\n+ return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n+ }\n+\n+ private int childL(int k) {\n+ return 2 * k + 1;\n+ }\n+\n+ private int childR(int k) {\n+ return 2 * k + 2;\n+ }\n+ }\n+ }\n \n public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int n1 = sc.nextInt();\n- int op_num = sc.nextInt();\n- String[] op = new String[op_num + 1];\n- for (int i = 0; i < op.length; i++) op[i] = sc.nextLine();\n-\n- init(n1);\n- arr = new int[op_num];\n-\n- for (int i = 1, mark = 0, i1 = 0; i <= op_num; i++) {\n- String[] Split = op[i].split(\" \");\n- int x, y, z;\n- if (Integer.parseInt(Split[0]) == 0) {\n- x = Integer.parseInt(Split[1]);\n- y = Integer.parseInt(Split[2]);\n- z = Integer.parseInt(Split[3]);\n- arr[i1] = z;\n- update(x, y + 1, 0, 0, n, mark);\n+ new Solver();\n+ }\n+\n+ static class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n } else {\n- x = Integer.parseInt(Split[1]);\n- int result = find(x + n - 1, n);\n- System.out.println(result);\n- }\n- i1++;\n- mark++;\n- }\n- }\n-\n- private static int find(int n1, int n2) {\n-\n- int max = n1;\n- for (int i = 0; n1 > 0; i++) {\n- n1 = (n1 - 1) / 2;\n- if (M[max] < M[n1]) max = n1;\n- }\n- int temp;\n- if (M[max] == -1) temp = INF;\n- else temp = arr[M[max]];\n-\n- return temp;\n- }\n-\n- public static void update(int a, int b, int k, int l, int r, int mark) {\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- M[k] = mark;\n- return;\n- }\n- update(a, b, 2 * k + 1, l, (l + r) / 2, mark);\n- update(a, b, 2 * k + 2, (l + r) / 2, r, mark);\n- }\n-\n- public static void init(int N) {\n-\n- n = 1;\n- while (n < N) n *= 2;\n- D = new int[n * 2 - 1];\n- M = new int[n * 2 - 1];\n- for (int i = 0; i < n * 2 - 1; i++) {\n- D[i] = INF;\n- M[i] = -1;\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ private void skipUnprintable() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ }\n+\n+ public boolean hasNext() {\n+ skipUnprintable();\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ return (int) nextLong();\n+ }\n+\n+ public int[] nextIntArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ int[] array = new int[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ } else {\n+ int[] array = new int[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextInt();\n+ }\n+ return array;\n+ }\n+ }\n+\n+ public long[] nextLongArray(int N, boolean oneBased) {\n+ if (oneBased) {\n+ long[] array = new long[N + 1];\n+ for (int i = 1; i <= N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ } else {\n+ long[] array = new long[N];\n+ for (int i = 0; i < N; i++) {\n+ array[i] = sc.nextLong();\n+ }\n+ return array;\n+ }\n }\n }\n }", "output": "FASTER 1.2028", "pair_id": "java_5738_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 2.3019} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Demo {\n\n public static void main(String[] args) {\n\n int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n n1 = 0;\n n2 = 0;\n n3 = 0;\n n = sc.nextInt();\n int[] arr = new int[n];\n\n for (int i = 0; i < arr.length; i++) {\n arr[i] = sc.nextInt();\n\n if (arr[i] < 0) {\n n1++;\n } else if (arr[i] > 0) {\n n2++;\n } else {\n n3++;\n }\n }\n int index1 = 0;\n int index2 = 0;\n int index3 = 0;\n boolean isPositive = true;\n if (n2 == 0) {\n n2 = 2;\n isPositive = false;\n n1 -= 2;\n }\n boolean isAdd = true;\n if (n1 % 2 == 0) {\n n1--;\n n3++;\n isAdd = false;\n }\n\n int[] arr1 = new int[n1];\n int[] arr2 = new int[n2];\n int[] arr3 = new int[n3];\n\n for (int i = 0; i < arr.length; i++) {\n\n if (arr[i] < 0) {\n if (isPositive == false && index2 < arr2.length) {\n arr2[index2++] = arr[i];\n } else if (isAdd == false) {\n arr3[index3++] = arr[i];\n isAdd = true;\n } else {\n arr1[index1++] = arr[i];\n }\n } else if (arr[i] > 0) {\n arr2[index2++] = arr[i];\n } else {\n arr3[index3++] = arr[i];\n }\n }\n intMang(arr1);\n intMang(arr2);\n intMang(arr3);\n }\n\n public static void intMang(int[] arr) {\n System.out.print(arr.length + \" \");\n for (int i = 0; i < arr.length; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println(\"\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class CF300A {\n+public class Demo {\n+\n public static void main(String[] args) {\n+\n+ int n, n1, n2, n3;\n Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n- int zeros = 0;\n- int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n+ n1 = 0;\n+ n2 = 0;\n+ n3 = 0;\n+ n = sc.nextInt();\n+ int[] arr = new int[n];\n \n- for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n+ for (int i = 0; i < arr.length; i++) {\n+ arr[i] = sc.nextInt();\n+\n+ if (arr[i] < 0) {\n+ n1++;\n+ } else if (arr[i] > 0) {\n+ n2++;\n+ } else {\n+ n3++;\n }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n+ }\n+ int index1 = 0;\n+ int index2 = 0;\n+ int index3 = 0;\n+ boolean isPositive = true;\n+ if (n2 == 0) {\n+ n2 = 2;\n+ isPositive = false;\n+ n1 -= 2;\n+ }\n+ boolean isAdd = true;\n+ if (n1 % 2 == 0) {\n+ n1--;\n+ n3++;\n+ isAdd = false;\n }\n \n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n- break;\n+ int[] arr1 = new int[n1];\n+ int[] arr2 = new int[n2];\n+ int[] arr3 = new int[n3];\n+\n+ for (int i = 0; i < arr.length; i++) {\n+\n+ if (arr[i] < 0) {\n+ if (isPositive == false && index2 < arr2.length) {\n+ arr2[index2++] = arr[i];\n+ } else if (isAdd == false) {\n+ arr3[index3++] = arr[i];\n+ isAdd = true;\n+ } else {\n+ arr1[index1++] = arr[i];\n }\n+ } else if (arr[i] > 0) {\n+ arr2[index2++] = arr[i];\n+ } else {\n+ arr3[index3++] = arr[i];\n }\n }\n+ intMang(arr1);\n+ intMang(arr2);\n+ intMang(arr3);\n+ }\n \n- int[] num = new int[n];\n-\n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n- }\n+ public static void intMang(int[] arr) {\n+ System.out.print(arr.length + \" \");\n+ for (int i = 0; i < arr.length; i++) {\n+ System.out.print(arr[i] + \" \");\n }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n+ System.out.println(\"\");\n }\n }", "output": "SLOWER 0.0689", "pair_id": "java_6821_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.0489} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner input = new Scanner(System.in);\n- while (input.hasNext()) {\n- int n = input.nextInt();\n- long[][] dp = new long[n + 1][n + 1];\n- for (long i = n; i >= 1; i--) {\n- for (long j = i + 2; j <= n; j++) {\n- if (j == i + 2) {\n- dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n- continue;\n- }\n- dp[(int) (i)][(int) (j)] =\n- Math.min(\n- dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n- dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n- }\n- }\n- System.out.println(dp[1][n]);\n+public class triangulation {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n- }\n-\n- static long modFact(int n, long p) {\n- if (n >= p) return 0;\n-\n- long result = 1;\n- for (int i = 1; i <= n; i++) result = (result * i) % p;\n-\n- return result;\n- }\n-\n- static boolean isPrime(int n) {\n-\n- if (n <= 1) return false;\n-\n- for (int i = 2; i < n; i++) if (n % i == 0) return false;\n-\n- return true;\n- }\n-\n- public static long fac(long n) {\n- if (n == 1) {\n- return 1;\n- }\n- return n * fac(n - 1);\n+ out.println(sum);\n+ out.close();\n }\n }", "output": "FASTER 0.1072", "pair_id": "java_216_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0771} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class GFG {\n+public class B {\n+\n+ private static long N;\n+ private static long LAST;\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n- int q = sc.nextInt();\n- for (int k = 0; k < q; k++) {\n+ int[][] data;\n+ try (Scanner scanner = new Scanner(System.in)) {\n+ N = scanner.nextInt();\n+ int q = scanner.nextInt();\n \n- i = new Long(sc.next());\n- j = new Long(sc.next());\n- if (n % 2 == 0) {\n- Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n- v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n+ LAST = N * N / 2 + (N & 1);\n \n- } else {\n- Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n- if ((i + j) % 2 == 0)\n- v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n- else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ data = new int[q][2];\n+ for (int step = 0; step < q; step++) {\n+ data[step][0] = scanner.nextInt();\n+ data[step][1] = scanner.nextInt();\n }\n- pw.println(v2);\n+\n+ for (int[] element : data) {\n+ System.out.println(number(element[0], element[1]));\n+ }\n }\n+ }\n \n- pw.flush();\n+ private static long number(long i, long j) {\n+\n+ long result = (i - 1) * N / 2 + j / 2;\n+ long jParity = j & 1;\n+ long tail = jParity + LAST * (jParity ^ (i & 1));\n+\n+ return result + (tail | ((N & 1) & (1 - jParity)));\n }\n }", "output": "SLOWER 0.5598", "pair_id": "java_5826_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.4741} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-\n-public class newProgram5 {\n-\n- public static void main(String[] args) throws IOException {\n-\n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n System.out.println(\"Yes\");\n } else {\n- System.out.println(\"No\");\n- }\n- }\n-\n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n-\n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n-\n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 4.4544", "pair_id": "java_4727_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 21.9231} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Problem023_300A_Array {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int zeros = 0;\n ArrayList positive = new ArrayList();\n ArrayList negative = new ArrayList();\n boolean hasPositive = false;\n int temp;\n boolean moveNegativeToZero = false;\n int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n temp = sc.nextInt();\n if (temp == 0) zeros++;\n else if (temp > 0) {\n hasPositive = true;\n positive.add(temp);\n } else negative.add(temp);\n }\n\n if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n moveNegativeToZero = true;\n valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n negative.remove(negative.size() - 1);\n }\n if (hasPositive) {\n System.out.print(negative.size() + \" \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else System.out.print(negative.size() - 2 + \" \");\n for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n System.out.println();\n\n if (!hasPositive) {\n System.out.print(\"2 \");\n for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n } else {\n System.out.print(positive.size() + \" \");\n for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n }\n System.out.println();\n\n System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n System.out.println();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class CF300A {\n- public static void main(String[] args) {\n+public class Problem023_300A_Array {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n- PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n- int[] neg = new int[1];\n+ int n = sc.nextInt();\n int zeros = 0;\n- int n = sc.nextInt();\n- ArrayList all = new ArrayList<>();\n- boolean found = false;\n- int c = 0;\n- int negN = -1;\n- int oddN = 0;\n- boolean odd = false;\n-\n+ ArrayList positive = new ArrayList();\n+ ArrayList negative = new ArrayList();\n+ boolean hasPositive = false;\n+ int temp;\n+ boolean moveNegativeToZero = false;\n+ int valueOfMoveNegativeToZero = 0;\n for (int i = 0; i < n; i++) {\n- int chk = sc.nextInt();\n- if (chk < 0) {\n- oddN++;\n- }\n- if (chk == 0) zeros++;\n- else all.add(chk);\n+ temp = sc.nextInt();\n+ if (temp == 0) zeros++;\n+ else if (temp > 0) {\n+ hasPositive = true;\n+ positive.add(temp);\n+ } else negative.add(temp);\n }\n \n- if (oddN > 0 && oddN % 2 == 0) {\n- odd = true;\n- for (int i = 0; i < all.size(); i++) {\n- if (all.get(i) < 0) {\n- negN = all.get(i);\n- all.remove(i);\n- break;\n- }\n- }\n+ if (negative.size() % 2 == 0 && (hasPositive || (!hasPositive && negative.size() != 2))) {\n+ moveNegativeToZero = true;\n+ valueOfMoveNegativeToZero = negative.get(negative.size() - 1);\n+ negative.remove(negative.size() - 1);\n }\n+ if (hasPositive) {\n+ System.out.print(negative.size() + \" \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else System.out.print(negative.size() - 2 + \" \");\n+ for (int i = 2; i < negative.size(); i++) System.out.print(negative.get(i) + \" \");\n+ System.out.println();\n \n- int[] num = new int[n];\n+ if (!hasPositive) {\n+ System.out.print(\"2 \");\n+ for (int i = 0; i < negative.size() && i < 2; i++) System.out.print(negative.get(i) + \" \");\n+ } else {\n+ System.out.print(positive.size() + \" \");\n+ for (int i = 0; i < positive.size(); i++) System.out.print(positive.get(i) + \" \");\n+ }\n+ System.out.println();\n \n- for (int i = 0; i < all.size(); i++) {\n- int x = all.get(i);\n- if (x < 0 && !found) {\n- neg[0] = x;\n- found = true;\n- } else if (x > 0 || (x < 0 && found)) {\n- num[c] = x;\n- c++;\n- }\n- }\n- pr.println(\"1 \" + neg[0]);\n- pr.print(c);\n- for (int i = 0; i < c; i++) {\n- pr.print(\" \" + num[i]);\n- }\n- pr.println();\n-\n- if (odd) pr.print(zeros + 1 + \" \" + negN);\n- else pr.print(zeros);\n-\n- for (int i = 0; i < zeros; i++) {\n- pr.print(\" 0\");\n- }\n- pr.flush();\n+ System.out.print(((moveNegativeToZero) ? (zeros + 1) : zeros) + \" \");\n+ for (int i = 0; i < zeros; i++) System.out.print(\"0 \");\n+ if (moveNegativeToZero) System.out.print(valueOfMoveNegativeToZero);\n+ System.out.println();\n }\n }", "output": "SLOWER 0.044", "pair_id": "java_6820_reversed", "problem_id": "300_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.031} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class NumbersOnTheChessboard {\n private static final boolean debug = false;\n\n public static void main(String args[]) throws Exception {\n BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n String[] S = bro.readLine().split(\" \");\n long n = Long.parseLong(S[0]);\n int q = Integer.parseInt(S[1]);\n for (int i = 0; i < q; i++) {\n S = bro.readLine().split(\" \");\n long x = Long.parseLong(S[0]);\n long y = Long.parseLong(S[1]);\n\n System.out.println(solve(x, y, n));\n }\n }\n\n static long solve(long x, long y, long n) {\n long rowSum = 0;\n long sq = 0;\n if (n % 2 == 0) sq = n * n / 2;\n else sq = (n * n + 1) / 2;\n if (n % 2 == 0) {\n if ((x + y) % 2 == 0) {\n rowSum = (n * (x - 1) / 2);\n } else {\n rowSum = sq + ((n * (x - 1)) / 2);\n }\n } else {\n if ((x + y) % 2 == 0) {\n if (x % 2 != 0) {\n rowSum = ((x - 1) / 2) * (n);\n } else {\n rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n }\n } else {\n if (x % 2 != 0) {\n\n rowSum = sq + (n * (x - 1) / 2);\n if (debug) {\n System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n }\n } else {\n rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n }\n }\n }\n return rowSum + (long) Math.ceil((double) y / 2);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String[] split1 = br.readLine().split(\" \");\n long N = Integer.parseInt(split1[0]);\n long Q = Integer.parseInt(split1[1]);\n\n long diff = ((N * N) + 1) / 2;\n\n for (int k = 0; k < Q; k++) {\n String[] split = br.readLine().split(\" \");\n long i = Integer.parseInt(split[0]);\n long j = Integer.parseInt(split[1]);\n\n long sum = i + j;\n if (sum % 2 == 0) {\n long gone = 0;\n\n if (i % 2 == 0) {\n gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n\n gone = gone + j / 2;\n } else {\n\n gone = gone + ((i - 1) / 2 * N);\n\n gone = gone + (j + 1) / 2;\n }\n System.out.println(gone);\n } else {\n long gone = diff;\n if (i % 2 == 0) {\n\n gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n\n gone = gone + (j + 1) / 2;\n } else {\n\n gone = gone + ((i - 1) / 2) * N;\n\n gone = gone + j / 2;\n }\n System.out.println(gone);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.util.*;\n \n-public class NumbersOnTheChessboard {\n- private static final boolean debug = false;\n+public class Main {\n \n- public static void main(String args[]) throws Exception {\n- BufferedReader bro = new BufferedReader(new InputStreamReader(System.in));\n- String[] S = bro.readLine().split(\" \");\n- long n = Long.parseLong(S[0]);\n- int q = Integer.parseInt(S[1]);\n- for (int i = 0; i < q; i++) {\n- S = bro.readLine().split(\" \");\n- long x = Long.parseLong(S[0]);\n- long y = Long.parseLong(S[1]);\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- System.out.println(solve(x, y, n));\n+ String[] split1 = br.readLine().split(\" \");\n+ long N = Integer.parseInt(split1[0]);\n+ long Q = Integer.parseInt(split1[1]);\n+\n+ long diff = ((N * N) + 1) / 2;\n+\n+ for (int k = 0; k < Q; k++) {\n+ String[] split = br.readLine().split(\" \");\n+ long i = Integer.parseInt(split[0]);\n+ long j = Integer.parseInt(split[1]);\n+\n+ long sum = i + j;\n+ if (sum % 2 == 0) {\n+ long gone = 0;\n+\n+ if (i % 2 == 0) {\n+ gone = gone + ((i - 2) / 2 * N) + ((N + 1) / 2);\n+\n+ gone = gone + j / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2 * N);\n+\n+ gone = gone + (j + 1) / 2;\n+ }\n+ System.out.println(gone);\n+ } else {\n+ long gone = diff;\n+ if (i % 2 == 0) {\n+\n+ gone = gone + ((i - 2) / 2 * N) + ((N) / 2);\n+\n+ gone = gone + (j + 1) / 2;\n+ } else {\n+\n+ gone = gone + ((i - 1) / 2) * N;\n+\n+ gone = gone + j / 2;\n+ }\n+ System.out.println(gone);\n+ }\n }\n }\n-\n- static long solve(long x, long y, long n) {\n- long rowSum = 0;\n- long sq = 0;\n- if (n % 2 == 0) sq = n * n / 2;\n- else sq = (n * n + 1) / 2;\n- if (n % 2 == 0) {\n- if ((x + y) % 2 == 0) {\n- rowSum = (n * (x - 1) / 2);\n- } else {\n- rowSum = sq + ((n * (x - 1)) / 2);\n- }\n- } else {\n- if ((x + y) % 2 == 0) {\n- if (x % 2 != 0) {\n- rowSum = ((x - 1) / 2) * (n);\n- } else {\n- rowSum = (((x - 2) / 2) * (n) + ((n + 1) / 2));\n- }\n- } else {\n- if (x % 2 != 0) {\n-\n- rowSum = sq + (n * (x - 1) / 2);\n- if (debug) {\n- System.out.println(\"rowSum :\" + rowSum + \" woo :\" + (long) Math.ceil(n * n / 2.0D));\n- }\n- } else {\n- rowSum = sq + ((x - 2) / 2) * (n) + (n - 1) / 2;\n- }\n- }\n- }\n- return rowSum + (long) Math.ceil((double) y / 2);\n- }\n }", "output": "FASTER 0.0845", "pair_id": "java_5818_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.0603} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class triangulation {\n+public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n- }\n- out.println(sum);\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n+ solver.solve(1, in, out);\n out.close();\n }\n+\n+ static class DMinimalnayaTriangulyaciya {\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i < n; i++) {\n+ ans += i * (i + 1);\n+ }\n+ out.println(ans);\n+ }\n+ }\n+\n+ static class InputReader {\n+\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream), 32768);\n+ tokenizer = null;\n+ }\n+\n+ public String next() {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+ }\n }", "output": "FASTER 5.0976", "pair_id": "java_180_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 34.2401} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n public static void main(String[] args) throws Exception {\n int[] nums0 = {1, 2, 2, 1, 0, 0};\n int[] nums1 = {0, 0, 1, 2, 2, 1};\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int current = sc.nextInt();\n int rem = n - (n / 6) * 6;\n if (rem == 0) {\n System.out.println(current);\n } else {\n if (nums0[rem - 1] == current) {\n System.out.println(\"0\");\n } else if (nums1[rem - 1] == current) {\n System.out.println(\"1\");\n } else {\n System.out.println(\"2\");\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class ShellGame {\n- public static void main(String[] args) {\n- Scanner nw = new Scanner(System.in);\n- int n = nw.nextInt();\n- int pos = nw.nextInt();\n- String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n- (n) %= elm.length;\n- System.out.println(elm[n].charAt(pos));\n+public class Test {\n+\n+ public static void main(String[] args) throws Exception {\n+ int[] nums0 = {1, 2, 2, 1, 0, 0};\n+ int[] nums1 = {0, 0, 1, 2, 2, 1};\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int current = sc.nextInt();\n+ int rem = n - (n / 6) * 6;\n+ if (rem == 0) {\n+ System.out.println(current);\n+ } else {\n+ if (nums0[rem - 1] == current) {\n+ System.out.println(\"0\");\n+ } else if (nums1[rem - 1] == current) {\n+ System.out.println(\"1\");\n+ } else {\n+ System.out.println(\"2\");\n+ }\n+ }\n }\n }", "output": "FASTER 0.0658", "pair_id": "java_427_forward", "problem_id": "777_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0467} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ACircleMetro solver = new ACircleMetro();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ACircleMetro {\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int a = in.nextInt();\n int x = in.nextInt();\n int b = in.nextInt();\n int y = in.nextInt();\n boolean flag = false;\n while (a != x && b != y) {\n if (a == n) a = 1;\n else a++;\n if (b == 1) b = n;\n else b--;\n if (a == b) {\n flag = true;\n break;\n }\n }\n if (flag) out.println(\"YES\");\n else out.println(\"NO\");\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n boolean nextBoolean() {\n return Boolean.parseBoolean(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n\n public static void main(String[] args) throws IOException {\n FastReader fr = new FastReader();\n int n = fr.nextInt();\n int a = fr.nextInt() - 1;\n int x = fr.nextInt() - 1;\n int b = fr.nextInt() - 1;\n int y = fr.nextInt() - 1;\n\n int i = a;\n int j = b;\n while (true) {\n\n if (i == j) {\n System.out.println(\"YES\");\n return;\n } else if (i == x || j == y) {\n System.out.println(\"NO\");\n return;\n } else {\n i = (i + 1) % (n);\n j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ACircleMetro solver = new ACircleMetro();\n- solver.solve(1, in, out);\n- out.close();\n+\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ boolean nextBoolean() {\n+ return Boolean.parseBoolean(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n }\n \n- static class ACircleMetro {\n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int a = in.nextInt();\n- int x = in.nextInt();\n- int b = in.nextInt();\n- int y = in.nextInt();\n- boolean flag = false;\n- while (a != x && b != y) {\n- if (a == n) a = 1;\n- else a++;\n- if (b == 1) b = n;\n- else b--;\n- if (a == b) {\n- flag = true;\n- break;\n- }\n+ public static void main(String[] args) throws IOException {\n+ FastReader fr = new FastReader();\n+ int n = fr.nextInt();\n+ int a = fr.nextInt() - 1;\n+ int x = fr.nextInt() - 1;\n+ int b = fr.nextInt() - 1;\n+ int y = fr.nextInt() - 1;\n+\n+ int i = a;\n+ int j = b;\n+ while (true) {\n+\n+ if (i == j) {\n+ System.out.println(\"YES\");\n+ return;\n+ } else if (i == x || j == y) {\n+ System.out.println(\"NO\");\n+ return;\n+ } else {\n+ i = (i + 1) % (n);\n+ j = (j - 1) % (n) >= 0 ? (j - 1) % (n) : n + (j - 1) % (n);\n }\n- if (flag) out.println(\"YES\");\n- else out.println(\"NO\");\n }\n }\n }", "output": "FASTER 5.8372", "pair_id": "java_5829_forward", "problem_id": "1169_A", "language": "java", "direction": "forward", "speedup_ratio": 57.1715} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.StringTokenizer;\n\npublic class NumbersOnTheChessboard {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n StringTokenizer st = new StringTokenizer(br.readLine());\n long n = Integer.parseInt(st.nextToken());\n int q = Integer.parseInt(st.nextToken());\n\n while (q-- != 0) {\n st = new StringTokenizer(br.readLine());\n long r = Integer.parseInt(st.nextToken()) - 1;\n long c = Integer.parseInt(st.nextToken()) - 1;\n long offset = 0;\n\n if ((r + c) % 2 == 1) {\n offset = (n * n + 1) / 2;\n }\n\n long cell = r * n + c;\n System.out.println(cell / 2 + offset + 1);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class EducationalRound49B {\n+public class NumbersOnTheChessboard {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ long n = Integer.parseInt(st.nextToken());\n+ int q = Integer.parseInt(st.nextToken());\n \n- public static void main(String[] args) {\n+ while (q-- != 0) {\n+ st = new StringTokenizer(br.readLine());\n+ long r = Integer.parseInt(st.nextToken()) - 1;\n+ long c = Integer.parseInt(st.nextToken()) - 1;\n+ long offset = 0;\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n- } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ if ((r + c) % 2 == 1) {\n+ offset = (n * n + 1) / 2;\n }\n- q--;\n- }\n- out.close();\n- }\n \n- public static PrintWriter out;\n-\n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- return str;\n+ long cell = r * n + c;\n+ System.out.println(cell / 2 + offset + 1);\n }\n }\n }", "output": "SLOWER 0.6043", "pair_id": "java_5775_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.5202} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n import java.util.*;\n \n-public class C {\n- static class Point {\n- int x, y;\n-\n- public Point(int x, int y) {\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n this.x = x;\n- this.y = y;\n- }\n-\n- public int getX() {\n- return x;\n- }\n-\n- public int getY() {\n- return y;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n-\n- @Override\n- public int hashCode() {\n-\n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n- }\n-\n- static class Square {\n- List points = new ArrayList<>();\n- }\n-\n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n- }\n-\n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "SLOWER 0.9734", "pair_id": "java_4753_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.9634} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedOutputStream;\nimport java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class EducationalRound49B {\n\n public static void main(String[] args) {\n\n out = new PrintWriter(new BufferedOutputStream(System.out));\n FastReader s = new FastReader();\n long n = s.nextLong();\n int q = s.nextInt();\n while (q > 0) {\n int x = s.nextInt();\n int y = s.nextInt();\n long ans = 0;\n if ((x + y) % 2 == 0) {\n long rem;\n if (x % 2 != 0) rem = (y + 1) / 2;\n else rem = y / 2 + (n + 1) / 2;\n out.println((((x + 1) / 2) - 1) * (n) + rem);\n } else {\n long rem;\n if (x % 2 != 0) rem = y / 2;\n else rem = (y + 1) / 2 + n / 2;\n out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n }\n q--;\n }\n out.close();\n }\n\n public static PrintWriter out;\n\n public static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedOutputStream;\n-import java.io.BufferedReader;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.io.BufferedInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n \n-public class EducationalRound49B {\n+public class B {\n+\n+ static long N;\n \n public static void main(String[] args) {\n+ JS in = new JS();\n+ N = in.nextLong();\n+ int Q = in.nextInt();\n+ long colSt = (N * N) / 2;\n+ if ((N * N) % 2 == 1) colSt++;\n \n- out = new PrintWriter(new BufferedOutputStream(System.out));\n- FastReader s = new FastReader();\n- long n = s.nextLong();\n- int q = s.nextInt();\n- while (q > 0) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- long ans = 0;\n- if ((x + y) % 2 == 0) {\n- long rem;\n- if (x % 2 != 0) rem = (y + 1) / 2;\n- else rem = y / 2 + (n + 1) / 2;\n- out.println((((x + 1) / 2) - 1) * (n) + rem);\n+ for (int q = 0; q < Q; q++) {\n+ int r = in.nextInt() - 1;\n+ int c = in.nextInt() - 1;\n+\n+ if ((r + c) % 2 == 0) {\n+ long o = N / 2;\n+ long bef = r;\n+ long nBef = (bef * o);\n+ if (N % 2 == 1) {\n+ long even = bef / 2;\n+ if (bef % 2 == 1) even++;\n+ nBef += even;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc);\n } else {\n- long rem;\n- if (x % 2 != 0) rem = y / 2;\n- else rem = (y + 1) / 2 + n / 2;\n- out.println((n * n + 1) / 2 + (((x + 1) / 2) - 1) * (n) + rem);\n+ long e = N / 2;\n+ long bef = r;\n+ long nBef = (bef * e);\n+ if (N % 2 == 1) {\n+ long odd = bef / 2;\n+ nBef += odd;\n+ }\n+ if (r == 0) nBef = 0;\n+ long cc = c / 2 + 1;\n+\n+ System.out.println(nBef + cc + colSt);\n }\n- q--;\n }\n- out.close();\n }\n \n- public static PrintWriter out;\n+ static class JS {\n+ public int BS = 1 << 16;\n+ public char NC = (char) 0;\n+ byte[] buf = new byte[BS];\n+ int bId = 0, size = 0;\n+ char c = NC;\n+ double num = 1;\n+ BufferedInputStream in;\n \n- public static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public JS() {\n+ in = new BufferedInputStream(System.in, BS);\n }\n \n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n+ public JS(String s) throws FileNotFoundException {\n+ in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n \n- int nextInt() {\n- return Integer.parseInt(next());\n+ public char nextChar() {\n+ while (bId == size) {\n+ try {\n+ size = in.read(buf);\n+ } catch (Exception e) {\n+ return NC;\n+ }\n+ if (size == -1) return NC;\n+ bId = 0;\n+ }\n+ return (char) buf[bId++];\n }\n \n- double nextDouble() {\n- return Double.parseDouble(next());\n+ public int nextInt() {\n+ return (int) nextLong();\n }\n \n- long nextLong() {\n- return Long.parseLong(next());\n+ public long nextLong() {\n+ num = 1;\n+ boolean neg = false;\n+ if (c == NC) c = nextChar();\n+ for (; (c < '0' || c > '9'); c = nextChar()) {\n+ if (c == '-') neg = true;\n+ }\n+ long res = 0;\n+ for (; c >= '0' && c <= '9'; c = nextChar()) {\n+ res = (res << 3) + (res << 1) + c - '0';\n+ num *= 10;\n+ }\n+ return neg ? -res : res;\n }\n \n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n+ public double nextDouble() {\n+ while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n+ boolean neg = c == '-';\n+ if (neg) c = nextChar();\n+ boolean fl = c == '.';\n+ double cur = nextLong();\n+ if (fl) return neg ? -cur / num : cur / num;\n+ if (c == '.') {\n+ double next = nextLong();\n+ return neg ? -cur - next / num : cur + next / num;\n+ } else return neg ? -cur : cur;\n+ }\n+\n+ public String next() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c > 32) {\n+ res.append(c);\n+ c = nextChar();\n }\n- return str;\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ StringBuilder res = new StringBuilder();\n+ while (c <= 32) c = nextChar();\n+ while (c != '\\n') {\n+ res.append(c);\n+ c = nextChar();\n+ }\n+ return res.toString();\n+ }\n+\n+ public boolean hasNext() {\n+ if (c > 32) return true;\n+ while (true) {\n+ c = nextChar();\n+ if (c == NC) return false;\n+ else if (c > 32) return true;\n+ }\n }\n }\n }", "output": "SLOWER 0.1383", "pair_id": "java_5774_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.1006} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- static Scanner in = new Scanner(System.in);\n- static PrintWriter out = new PrintWriter(System.out);\n-\n+public class triangulation {\n public static void main(String[] args) {\n- int n = in.nextInt();\n-\n- int weight = 0;\n- for (int i = 1; i < n - 1; i++) {\n- weight += ((i + 1) * (i + 2));\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int t = sc.nextInt();\n+ int sum = 0;\n+ for (int i = 1; i <= t - 2; i++) {\n+ sum += (i + 1) * (i + 2);\n }\n-\n- out.println(weight);\n-\n- in.close();\n+ out.println(sum);\n out.close();\n }\n }", "output": "FASTER 0.0068", "pair_id": "java_215_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0047} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n-\n System.out.println((X - A) % B);\n }\n }", "output": "SLOWER 0.1384", "pair_id": "java_6635_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.1007} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- solve3027();\n- }\n \n- public static void solve3027() {\n- Scanner sc = new Scanner(System.in);\n+ public static void main(String[] args) throws IOException {\n \n- int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n- System.out.println(ans);\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n \n- sc.close();\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n+ }\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7554", "pair_id": "java_7306_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 108.0399} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.Rectangle;\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class Main {\n+import java.util.*;\n+\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskA solver = new TaskA();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskA {\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- Polygon p1 = new Polygon();\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- p1.addPoint(in.nextInt(), in.nextInt());\n- Rectangle r = p1.getBounds();\n- Polygon p2 = new Polygon();\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- p2.addPoint(in.nextInt(), in.nextInt());\n- boolean inside = p2.intersects(r);\n- boolean point = false;\n- point |= intersPoint(p1, p2);\n- point |= intersPoint(p2, p1);\n- out.println((inside || point) ? \"YES\" : \"NO\");\n- }\n-\n- boolean intersPoint(Polygon p1, Polygon p2) {\n- for (int i = 0; i < p1.npoints; i++) {\n- int i2 = (i + 1) % p1.npoints;\n- int dx = p1.xpoints[i] - p1.xpoints[i2];\n- int dy = p1.ypoints[i] - p1.ypoints[i2];\n- Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- for (int j = 0; j < p2.npoints; j++) {\n- dx = p1.xpoints[i] - p2.xpoints[j];\n- dy = p1.ypoints[i] - p2.ypoints[j];\n- Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- dx = p2.xpoints[j] - p1.xpoints[i2];\n- dy = p2.ypoints[j] - p1.ypoints[i2];\n- Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n- if (edge1 + edge2 == edge) return true;\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n }\n }\n- return false;\n- }\n- }\n-\n- static class InputReader {\n- private StringTokenizer tokenizer;\n- private BufferedReader reader;\n-\n- public InputReader(InputStream inputStream) {\n- reader = new BufferedReader(new InputStreamReader(inputStream));\n- }\n-\n- private void fillTokenizer() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException(e);\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n }\n }\n }\n-\n- public String next() {\n- fillTokenizer();\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "FASTER 0.6873", "pair_id": "java_4760_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.6103} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.Polygon;\n-import java.awt.geom.Area;\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class C994 {\n- static class Scanner {\n- BufferedReader br;\n- StringTokenizer tk = new StringTokenizer(\"\");\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n+ }\n \n- public Scanner(InputStream is) {\n- br = new BufferedReader(new InputStreamReader(is));\n- }\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n \n- public int nextInt() throws IOException {\n- if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextInt();\n- }\n-\n- public long nextLong() throws IOException {\n- if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextLong();\n- }\n-\n- public String next() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return next();\n- }\n-\n- public String nextLine() throws IOException {\n- tk = new StringTokenizer(\"\");\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n- tk = new StringTokenizer(br.readLine());\n- return nextDouble();\n- }\n-\n- public char nextChar() throws IOException {\n- if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n- tk = new StringTokenizer(br.readLine());\n- return nextChar();\n- }\n-\n- public int[] nextIntArray(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArray(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) a[i] = nextLong();\n- return a;\n- }\n-\n- public int[] nextIntArrayOneBased(int n) throws IOException {\n- int a[] = new int[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextInt();\n- return a;\n- }\n-\n- public long[] nextLongArrayOneBased(int n) throws IOException {\n- long a[] = new long[n + 1];\n- for (int i = 1; i <= n; i++) a[i] = nextLong();\n- return a;\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner in = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int x1[] = new int[4];\n- int y1[] = new int[4];\n- int x2[] = new int[4];\n- int y2[] = new int[4];\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n+\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n- x1[i] = in.nextInt();\n- y1[i] = in.nextInt();\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n+ }\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- for (int i = 0; i < 4; i++) {\n- x2[i] = in.nextInt();\n- y2[i] = in.nextInt();\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n- Polygon p1 = new Polygon(x1, y1, 4);\n- Polygon p2 = new Polygon(x2, y2, 4);\n- Area a = new Area(p1);\n- a.intersect(new Area(p2));\n- boolean ans = !a.isEmpty();\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n- }\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n- }\n- }\n- if (ans) out.println(\"Yes\");\n- else out.println(\"No\");\n- out.close();\n- }\n-\n- static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n- int minx = Math.min(x1, x2);\n- int miny = Math.min(y1, y2);\n- int maxx = Math.max(x1, x2);\n- int maxy = Math.max(y1, y2);\n- if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n- if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n- }\n- return false;\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 3.6565", "pair_id": "java_4737_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 12.6101} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int N = Integer.parseInt(sc.next());\n+ String S = sc.next();\n+ StringBuilder sb = new StringBuilder(S);\n+ int ans = 0;\n+ for (int i = 0; i < S.length(); i++) {\n+ String S_tmp = sb.substring(i);\n+ int[] z = z_algo(S_tmp);\n \n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- String s = in.next();\n+ for (int j = 1; j < S.length() - i; j++) {\n+ if (j >= z[j]) {\n+ ans = Math.max(ans, z[j]);\n+ }\n+ }\n+ }\n+ System.out.println(ans);\n+ }\n \n- HashSet set = new HashSet<>();\n-\n- int len = 1;\n- int lenMax = 0;\n- for (int st = 0; st + len - 1 < n; st++) {\n- String temp = s.substring(st, st + len);\n-\n- while (s.indexOf(temp, st + len) > st) {\n- len++;\n- temp = s.substring(st, st + len);\n+ public static int[] z_algo(String S) {\n+ int N = S.length();\n+ int[] A = new int[N];\n+ A[0] = N;\n+ int i = 1;\n+ int j = 0;\n+ while (i < N) {\n+ while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n+ j++;\n }\n- lenMax = Math.max(lenMax, len - 1);\n+ A[i] = j;\n+ if (j == 0) {\n+ i++;\n+ continue;\n+ }\n+ int k = 1;\n+ while (i + k < N && k + A[k] < j) {\n+ A[i + k] = A[k];\n+ k++;\n+ }\n+ i += k;\n+ j -= k;\n }\n-\n- System.out.println(lenMax);\n- in.close();\n+ return A;\n }\n }", "output": "SLOWER 0.4881", "pair_id": "java_3830_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.4026} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n Scanner sc = new Scanner(System.in);\n \n int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n \n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n \n sc.close();", "output": "FASTER 0.0151", "pair_id": "java_7308_forward", "problem_id": "p02125", "language": "java", "direction": "forward", "speedup_ratio": 1.0105} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String[] args) throws Exception {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- System.out.println((sc.nextInt() - sc.nextInt()) % sc.nextInt());\n+ int X = sc.nextInt();\n+ int A = sc.nextInt();\n+ int B = sc.nextInt();\n+ System.out.println((X - A) % B);\n }\n }", "output": "SLOWER 0.0159", "pair_id": "java_6640_reversed", "problem_id": "p03447", "language": "java", "direction": "reversed", "speedup_ratio": 1.0111} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.IOException;\n import java.io.InputStreamReader;\n import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n-\n-public class QuestionC {\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n- int[][] s1 = new int[4][2], s2 = new int[4][2];\n- StringTokenizer st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s1[i][0] = Integer.parseInt(st.nextToken());\n- s1[i][1] = Integer.parseInt(st.nextToken());\n- }\n- st = new StringTokenizer(in.readLine());\n- for (int i = 0; i < 4; i++) {\n- s2[i][0] = Integer.parseInt(st.nextToken());\n- s2[i][1] = Integer.parseInt(st.nextToken());\n- }\n- for (int i = 0; i < 4; i++) {\n- for (int j = 0; j < 4; j++) {\n- if (inter(\n- s1[i][0],\n- s1[i][1],\n- s1[(i + 1) % 4][0],\n- s1[(i + 1) % 4][1],\n- s2[j][0],\n- s2[j][1],\n- s2[(j + 1) % 4][0],\n- s2[(j + 1) % 4][1])) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- }\n- }\n- if (checkInside(s1, s2)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- int[][] s3 = new int[4][2], s4 = new int[4][2];\n- for (int i = 0; i < 4; i++) {\n- s3[i][0] = s1[i][0] - s1[i][1];\n- s3[i][1] = s1[i][0] + s1[i][1];\n- s4[i][0] = s2[i][0] - s2[i][1];\n- s4[i][1] = s2[i][0] + s2[i][1];\n- }\n- if (checkInside(s4, s3)) {\n- out.println(\"YES\");\n- out.close();\n- return;\n- }\n- out.println(\"NO\");\n- in.close();\n- out.close();\n- }\n-\n- public static boolean checkInside(int[][] s1, int[][] s2) {\n- int lx = Integer.MAX_VALUE,\n- hx = Integer.MIN_VALUE,\n- ly = Integer.MAX_VALUE,\n- hy = Integer.MIN_VALUE;\n- for (int i = 0; i < 4; i++) {\n- lx = Math.min(lx, s1[i][0]);\n- hx = Math.max(hx, s1[i][0]);\n- ly = Math.min(ly, s1[i][1]);\n- hy = Math.max(hy, s1[i][1]);\n- }\n- for (int i = 0; i < 4; i++) {\n- if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n- int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n- if (v == 0) return 0;\n- return (v > 0) ? 1 : 2;\n- }\n-\n- public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n- return bx <= Math.max(ax, cx)\n- && bx >= Math.min(ax, cx)\n- && by <= Math.max(ay, cy)\n- && by >= Math.min(ay, cy);\n- }\n-\n- public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n- int o1 = orie(ax, ay, bx, by, cx, cy),\n- o2 = orie(ax, ay, bx, by, dx, dy),\n- o3 = orie(cx, cy, dx, dy, ax, ay),\n- o4 = orie(cx, cy, dx, dy, bx, by);\n- if (o1 != o2 && o3 != o4) return true;\n- if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n- if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n- if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n- if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n- return false;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n+ private final BufferedWriter bw;\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n+ try {\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "SLOWER 0.845", "pair_id": "java_4692_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.7963} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class JavaApplication42 {\n\n public static void main(String[] args) {\n\n Scanner inp = new Scanner(System.in);\n int n = inp.nextInt();\n int sum = 0;\n for (int i = 2; i < n; i++) {\n sum += 1 * i * (i + 1);\n }\n System.out.println(sum);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class JavaApplication42 {\n+public class ProblemD {\n \n public static void main(String[] args) {\n \n- Scanner inp = new Scanner(System.in);\n- int n = inp.nextInt();\n- int sum = 0;\n- for (int i = 2; i < n; i++) {\n- sum += 1 * i * (i + 1);\n- }\n- System.out.println(sum);\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0106", "pair_id": "java_193_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0074} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n static FastScanner sc = new FastScanner();\n static PrintStream out = System.out;\n static PrintWriter pw = new PrintWriter(out);\n\n static final int[] dx = {0, 1, 0, -1};\n static final int[] dy = {-1, 0, 1, 0};\n\n static final long MOD = (long) (1e9 + 7);\n static final long INF = Long.MAX_VALUE / 2;\n\n public static class Solver {\n public Solver() {\n\n int n = sc.nextInt();\n int q = sc.nextInt();\n\n long[] a = new long[n];\n Arrays.fill(a, (1 << 31) - 1);\n\n SegmentTree seg = new SegmentTree(a);\n\n for (int i = 0; i < q; i++) {\n int com = sc.nextInt();\n if (com == 0) {\n seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n } else {\n int index = sc.nextInt();\n out.println(seg.query(index, index + 1).val);\n }\n }\n }\n\n public static class SegmentTree {\n\n static final long INF = Long.MAX_VALUE / 2;\n\n Node[] tree;\n int N = 1;\n int size;\n Node initialNode;\n\n public static class Node {\n static long initialVal = 0;\n static long initialLazy = 0;\n long val;\n long lazy;\n boolean isLazy;\n\n public Node() {\n val = initialVal;\n lazy = initialLazy;\n }\n\n public Node(long val) {\n this.val = val;\n lazy = initialLazy;\n }\n\n public Node operation(Node nl, Node nr) {\n val = nl.val + nr.val;\n return this;\n }\n\n public void prop(Node par) {\n if (!par.isLazy) return;\n lazy = par.lazy / 2;\n isLazy = true;\n }\n\n public void prop(long x, int l, int r) {\n lazy = x * (r - l);\n isLazy = true;\n }\n\n public void update() {\n if (!isLazy) return;\n val = lazy;\n lazy = initialLazy;\n isLazy = false;\n }\n }\n\n public void update(int k, long x) {\n k += N - 1;\n tree[k] = new Node(x);\n\n while (k != 0) {\n k = parent(k);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n private void prop(int k) {\n if (childL(k) < size) {\n tree[childL(k)].prop(tree[k]);\n tree[childR(k)].prop(tree[k]);\n }\n tree[k].update();\n }\n\n public void put(int a, int b, long x) {\n put(a, b, 0, 0, N, x);\n }\n\n private void put(int a, int b, int k, int l, int r, long x) {\n prop(k);\n\n if (r <= a || b <= l) return;\n if (a <= l && r <= b) {\n tree[k].prop(x, l, r);\n prop(k);\n } else {\n put(a, b, childL(k), l, (l + r) / 2, x);\n put(a, b, childR(k), (l + r) / 2, r, x);\n tree[k].operation(tree[childL(k)], tree[childR(k)]);\n }\n }\n\n public SegmentTree(long[] A) {\n initialNode = new Node();\n\n while (N < A.length) N *= 2;\n\n size = N * 2 - 1;\n tree = new Node[size];\n\n for (int i = 0; i < size; i++) {\n tree[i] = new Node();\n }\n\n for (int i = 0; i < A.length; i++) {\n update(i, A[i]);\n }\n }\n\n public Node query(int a, int b) {\n return query(a, b, 0, 0, N);\n }\n\n private Node query(int a, int b, int k, int l, int r) {\n prop(k);\n\n if (r <= a || b <= l) return initialNode;\n if (a <= l && r <= b) return tree[k];\n\n return new Node()\n .operation(\n query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n }\n\n private int parent(int k) {\n return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n }\n\n private int childL(int k) {\n return 2 * k + 1;\n }\n\n private int childR(int k) {\n return 2 * k + 2;\n }\n }\n }\n\n public static void main(String[] args) {\n new Solver();\n }\n\n static class FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n private void skipUnprintable() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n }\n\n public boolean hasNext() {\n skipUnprintable();\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public int[] nextIntArray(int N, boolean oneBased) {\n if (oneBased) {\n int[] array = new int[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n } else {\n int[] array = new int[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextInt();\n }\n return array;\n }\n }\n\n public long[] nextLongArray(int N, boolean oneBased) {\n if (oneBased) {\n long[] array = new long[N + 1];\n for (int i = 1; i <= N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n } else {\n long[] array = new long[N];\n for (int i = 0; i < N; i++) {\n array[i] = sc.nextLong();\n }\n return array;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n\n private static Scanner sc;\n private static Printer pr;\n\n private static void solve() {\n int n = sc.nextInt();\n int[] data = new int[n];\n Arrays.fill(data, (1 << 31) - 1);\n RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n\n int q = sc.nextInt();\n for (int i = 0; i < q; i++) {\n int cmd = sc.nextInt();\n\n if (cmd == 0) {\n int s = sc.nextInt();\n int t = sc.nextInt();\n int x = sc.nextInt();\n\n ruq.update(s, t + 1, x);\n } else if (cmd == 1) {\n int index = sc.nextInt();\n\n pr.println(ruq.find(index));\n pr.flush();\n }\n }\n }\n\n private static class RUQ_SqrtDecomposition {\n int[] data;\n int[] bakets;\n int n;\n int d;\n int m;\n\n static final int NULL = -1;\n\n public RUQ_SqrtDecomposition(int[] data) {\n this.n = data.length;\n this.data = data;\n this.d = (int) Math.sqrt(n);\n\n this.m = (n + d - 1) / d;\n bakets = new int[m];\n Arrays.fill(bakets, NULL);\n }\n\n void update(int l, int r, int x) {\n int bl = l / d;\n int br = Math.min(r / d, m - 1);\n for (int i = bl; i <= br; i++) {\n int tmpl = i * d;\n int tmpr = Math.min((i + 1) * d, n);\n if (tmpl >= l && tmpr <= r) {\n bakets[i] = x;\n } else {\n if (bakets[i] != NULL) {\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = bakets[i];\n }\n }\n bakets[i] = NULL;\n\n tmpl = Math.max(tmpl, l);\n tmpr = Math.min(tmpr, r);\n for (int j = tmpl; j < tmpr; j++) {\n data[j] = x;\n }\n }\n }\n }\n\n int find(int index) {\n int bi = index / d;\n if (bakets[bi] != NULL) {\n return bakets[bi];\n } else {\n return data[index];\n }\n }\n }\n\n public static void main(String[] args) {\n sc = new Scanner(System.in);\n pr = new Printer(System.out);\n\n solve();\n\n pr.close();\n sc.close();\n }\n\n @SuppressWarnings(\"unused\")\n private static class Scanner {\n BufferedReader br;\n\n Scanner(InputStream in) {\n br = new BufferedReader(new InputStreamReader(in));\n }\n\n private boolean isPrintable(int ch) {\n return ch >= '!' && ch <= '~';\n }\n\n private boolean isCRLF(int ch) {\n return ch == '\\n' || ch == '\\r' || ch == -1;\n }\n\n private int nextPrintable() {\n try {\n int ch;\n while (!isPrintable(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n\n return ch;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n String next() {\n try {\n int ch = nextPrintable();\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (isPrintable(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n int nextInt() {\n try {\n\n boolean negative = false;\n int res = 0;\n int limit = -Integer.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Integer.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n int multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n long nextLong() {\n try {\n\n boolean negative = false;\n long res = 0;\n long limit = -Long.MAX_VALUE;\n int radix = 10;\n\n int fc = nextPrintable();\n if (fc < '0') {\n if (fc == '-') {\n negative = true;\n limit = Long.MIN_VALUE;\n } else if (fc != '+') {\n throw new NumberFormatException();\n }\n fc = br.read();\n }\n long multmin = limit / radix;\n\n int ch = fc;\n do {\n int digit = ch - '0';\n if (digit < 0 || digit >= radix) {\n throw new NumberFormatException();\n }\n if (res < multmin) {\n throw new NumberFormatException();\n }\n res *= radix;\n if (res < limit + digit) {\n throw new NumberFormatException();\n }\n res -= digit;\n\n } while (isPrintable(ch = br.read()));\n\n return negative ? res : -res;\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n float nextFloat() {\n return Float.parseFloat(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n try {\n int ch;\n while (isCRLF(ch = br.read())) {\n if (ch == -1) {\n throw new NoSuchElementException();\n }\n }\n StringBuilder sb = new StringBuilder();\n do {\n sb.appendCodePoint(ch);\n } while (!isCRLF(ch = br.read()));\n\n return sb.toString();\n } catch (IOException e) {\n throw new NoSuchElementException();\n }\n }\n\n void close() {\n try {\n br.close();\n } catch (IOException e) {\n\n }\n }\n }\n\n private static class Printer extends PrintWriter {\n Printer(PrintStream out) {\n super(out);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n public class Main {\n \n- static FastScanner sc = new FastScanner();\n- static PrintStream out = System.out;\n- static PrintWriter pw = new PrintWriter(out);\n-\n- static final int[] dx = {0, 1, 0, -1};\n- static final int[] dy = {-1, 0, 1, 0};\n-\n- static final long MOD = (long) (1e9 + 7);\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- public static class Solver {\n- public Solver() {\n-\n- int n = sc.nextInt();\n- int q = sc.nextInt();\n-\n- long[] a = new long[n];\n- Arrays.fill(a, (1 << 31) - 1);\n-\n- SegmentTree seg = new SegmentTree(a);\n-\n- for (int i = 0; i < q; i++) {\n- int com = sc.nextInt();\n- if (com == 0) {\n- seg.put(sc.nextInt(), sc.nextInt() + 1, sc.nextLong());\n+ private static Scanner sc;\n+ private static Printer pr;\n+\n+ private static void solve() {\n+ int n = sc.nextInt();\n+ int[] data = new int[n];\n+ Arrays.fill(data, (1 << 31) - 1);\n+ RUQ_SqrtDecomposition ruq = new RUQ_SqrtDecomposition(data);\n+\n+ int q = sc.nextInt();\n+ for (int i = 0; i < q; i++) {\n+ int cmd = sc.nextInt();\n+\n+ if (cmd == 0) {\n+ int s = sc.nextInt();\n+ int t = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ ruq.update(s, t + 1, x);\n+ } else if (cmd == 1) {\n+ int index = sc.nextInt();\n+\n+ pr.println(ruq.find(index));\n+ pr.flush();\n+ }\n+ }\n+ }\n+\n+ private static class RUQ_SqrtDecomposition {\n+ int[] data;\n+ int[] bakets;\n+ int n;\n+ int d;\n+ int m;\n+\n+ static final int NULL = -1;\n+\n+ public RUQ_SqrtDecomposition(int[] data) {\n+ this.n = data.length;\n+ this.data = data;\n+ this.d = (int) Math.sqrt(n);\n+\n+ this.m = (n + d - 1) / d;\n+ bakets = new int[m];\n+ Arrays.fill(bakets, NULL);\n+ }\n+\n+ void update(int l, int r, int x) {\n+ int bl = l / d;\n+ int br = Math.min(r / d, m - 1);\n+ for (int i = bl; i <= br; i++) {\n+ int tmpl = i * d;\n+ int tmpr = Math.min((i + 1) * d, n);\n+ if (tmpl >= l && tmpr <= r) {\n+ bakets[i] = x;\n } else {\n- int index = sc.nextInt();\n- out.println(seg.query(index, index + 1).val);\n- }\n- }\n- }\n-\n- public static class SegmentTree {\n-\n- static final long INF = Long.MAX_VALUE / 2;\n-\n- Node[] tree;\n- int N = 1;\n- int size;\n- Node initialNode;\n-\n- public static class Node {\n- static long initialVal = 0;\n- static long initialLazy = 0;\n- long val;\n- long lazy;\n- boolean isLazy;\n-\n- public Node() {\n- val = initialVal;\n- lazy = initialLazy;\n- }\n-\n- public Node(long val) {\n- this.val = val;\n- lazy = initialLazy;\n- }\n-\n- public Node operation(Node nl, Node nr) {\n- val = nl.val + nr.val;\n- return this;\n- }\n-\n- public void prop(Node par) {\n- if (!par.isLazy) return;\n- lazy = par.lazy / 2;\n- isLazy = true;\n- }\n-\n- public void prop(long x, int l, int r) {\n- lazy = x * (r - l);\n- isLazy = true;\n- }\n-\n- public void update() {\n- if (!isLazy) return;\n- val = lazy;\n- lazy = initialLazy;\n- isLazy = false;\n- }\n- }\n-\n- public void update(int k, long x) {\n- k += N - 1;\n- tree[k] = new Node(x);\n-\n- while (k != 0) {\n- k = parent(k);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- private void prop(int k) {\n- if (childL(k) < size) {\n- tree[childL(k)].prop(tree[k]);\n- tree[childR(k)].prop(tree[k]);\n- }\n- tree[k].update();\n- }\n-\n- public void put(int a, int b, long x) {\n- put(a, b, 0, 0, N, x);\n- }\n-\n- private void put(int a, int b, int k, int l, int r, long x) {\n- prop(k);\n-\n- if (r <= a || b <= l) return;\n- if (a <= l && r <= b) {\n- tree[k].prop(x, l, r);\n- prop(k);\n- } else {\n- put(a, b, childL(k), l, (l + r) / 2, x);\n- put(a, b, childR(k), (l + r) / 2, r, x);\n- tree[k].operation(tree[childL(k)], tree[childR(k)]);\n- }\n- }\n-\n- public SegmentTree(long[] A) {\n- initialNode = new Node();\n-\n- while (N < A.length) N *= 2;\n-\n- size = N * 2 - 1;\n- tree = new Node[size];\n-\n- for (int i = 0; i < size; i++) {\n- tree[i] = new Node();\n- }\n-\n- for (int i = 0; i < A.length; i++) {\n- update(i, A[i]);\n- }\n- }\n-\n- public Node query(int a, int b) {\n- return query(a, b, 0, 0, N);\n- }\n-\n- private Node query(int a, int b, int k, int l, int r) {\n- prop(k);\n-\n- if (r <= a || b <= l) return initialNode;\n- if (a <= l && r <= b) return tree[k];\n-\n- return new Node()\n- .operation(\n- query(a, b, childL(k), l, (l + r) / 2), query(a, b, childR(k), (l + r) / 2, r));\n- }\n-\n- private int parent(int k) {\n- return k % 2 == 0 ? (k - 2) / 2 : (k - 1) / 2;\n- }\n-\n- private int childL(int k) {\n- return 2 * k + 1;\n- }\n-\n- private int childR(int k) {\n- return 2 * k + 2;\n+ if (bakets[i] != NULL) {\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = bakets[i];\n+ }\n+ }\n+ bakets[i] = NULL;\n+\n+ tmpl = Math.max(tmpl, l);\n+ tmpr = Math.min(tmpr, r);\n+ for (int j = tmpl; j < tmpr; j++) {\n+ data[j] = x;\n+ }\n+ }\n+ }\n+ }\n+\n+ int find(int index) {\n+ int bi = index / d;\n+ if (bakets[bi] != NULL) {\n+ return bakets[bi];\n+ } else {\n+ return data[index];\n }\n }\n }\n \n public static void main(String[] args) {\n- new Solver();\n- }\n-\n- static class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- private void skipUnprintable() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- }\n-\n- public boolean hasNext() {\n- skipUnprintable();\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public int[] nextIntArray(int N, boolean oneBased) {\n- if (oneBased) {\n- int[] array = new int[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- } else {\n- int[] array = new int[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextInt();\n- }\n- return array;\n- }\n- }\n-\n- public long[] nextLongArray(int N, boolean oneBased) {\n- if (oneBased) {\n- long[] array = new long[N + 1];\n- for (int i = 1; i <= N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- } else {\n- long[] array = new long[N];\n- for (int i = 0; i < N; i++) {\n- array[i] = sc.nextLong();\n- }\n- return array;\n- }\n+ sc = new Scanner(System.in);\n+ pr = new Printer(System.out);\n+\n+ solve();\n+\n+ pr.close();\n+ sc.close();\n+ }\n+\n+ @SuppressWarnings(\"unused\")\n+ private static class Scanner {\n+ BufferedReader br;\n+\n+ Scanner(InputStream in) {\n+ br = new BufferedReader(new InputStreamReader(in));\n+ }\n+\n+ private boolean isPrintable(int ch) {\n+ return ch >= '!' && ch <= '~';\n+ }\n+\n+ private boolean isCRLF(int ch) {\n+ return ch == '\\n' || ch == '\\r' || ch == -1;\n+ }\n+\n+ private int nextPrintable() {\n+ try {\n+ int ch;\n+ while (!isPrintable(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ return ch;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ String next() {\n+ try {\n+ int ch = nextPrintable();\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (isPrintable(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ int nextInt() {\n+ try {\n+\n+ boolean negative = false;\n+ int res = 0;\n+ int limit = -Integer.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Integer.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ int multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ long nextLong() {\n+ try {\n+\n+ boolean negative = false;\n+ long res = 0;\n+ long limit = -Long.MAX_VALUE;\n+ int radix = 10;\n+\n+ int fc = nextPrintable();\n+ if (fc < '0') {\n+ if (fc == '-') {\n+ negative = true;\n+ limit = Long.MIN_VALUE;\n+ } else if (fc != '+') {\n+ throw new NumberFormatException();\n+ }\n+ fc = br.read();\n+ }\n+ long multmin = limit / radix;\n+\n+ int ch = fc;\n+ do {\n+ int digit = ch - '0';\n+ if (digit < 0 || digit >= radix) {\n+ throw new NumberFormatException();\n+ }\n+ if (res < multmin) {\n+ throw new NumberFormatException();\n+ }\n+ res *= radix;\n+ if (res < limit + digit) {\n+ throw new NumberFormatException();\n+ }\n+ res -= digit;\n+\n+ } while (isPrintable(ch = br.read()));\n+\n+ return negative ? res : -res;\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ float nextFloat() {\n+ return Float.parseFloat(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ try {\n+ int ch;\n+ while (isCRLF(ch = br.read())) {\n+ if (ch == -1) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ do {\n+ sb.appendCodePoint(ch);\n+ } while (!isCRLF(ch = br.read()));\n+\n+ return sb.toString();\n+ } catch (IOException e) {\n+ throw new NoSuchElementException();\n+ }\n+ }\n+\n+ void close() {\n+ try {\n+ br.close();\n+ } catch (IOException e) {\n+\n+ }\n+ }\n+ }\n+\n+ private static class Printer extends PrintWriter {\n+ Printer(PrintStream out) {\n+ super(out);\n }\n }\n }", "output": "FASTER 0.2029", "pair_id": "java_5729_forward", "problem_id": "p02348", "language": "java", "direction": "forward", "speedup_ratio": 1.151} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n String s = in.next();\n\n HashSet set = new HashSet<>();\n\n int len = 1;\n int lenMax = 0;\n for (int st = 0; st + len - 1 < n; st++) {\n String temp = s.substring(st, st + len);\n\n while (s.indexOf(temp, st + len) > st) {\n len++;\n temp = s.substring(st, st + len);\n }\n lenMax = Math.max(lenMax, len - 1);\n }\n\n System.out.println(lenMax);\n in.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- String s = in.next();\n+ Scanner sc = new Scanner(System.in);\n+ int num = Integer.parseInt(sc.next());\n+ String str = sc.next();\n \n- HashSet set = new HashSet<>();\n-\n- int len = 1;\n- int lenMax = 0;\n- for (int st = 0; st + len - 1 < n; st++) {\n- String temp = s.substring(st, st + len);\n-\n- while (s.indexOf(temp, st + len) > st) {\n- len++;\n- temp = s.substring(st, st + len);\n+ int res = 0;\n+ for (int len = num; len > 0; len--) {\n+ int[] dp = new int[num];\n+ for (int i = num - len - 1; i >= 0; i--) {\n+ if (str.charAt(i) == str.charAt(i + len)) {\n+ dp[i] = Math.min(dp[i + 1] + 1, len);\n+ res = Math.max(res, dp[i]);\n+ } else {\n+ dp[i] = 0;\n+ }\n }\n- lenMax = Math.max(lenMax, len - 1);\n }\n \n- System.out.println(lenMax);\n- in.close();\n+ System.out.println(res);\n }\n }", "output": "SLOWER 0.1022", "pair_id": "java_3828_reversed", "problem_id": "p02913", "language": "java", "direction": "reversed", "speedup_ratio": 1.0734} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class edu_1027_B {\n static long ans = 1000000000;\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[64];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n public static void main(String args[]) throws IOException {\n Reader ob = new Reader();\n long n = ob.nextLong();\n\n int q = ob.nextInt();\n while (q != 0) {\n long x = ob.nextLong();\n long y = ob.nextLong();\n\n long ans = 0, end = 0;\n\n if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n else {\n if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n }\n\n q--;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class GFG {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n int q = sc.nextInt();\n for (int k = 0; k < q; k++) {\n\n i = new Long(sc.next());\n j = new Long(sc.next());\n if (n % 2 == 0) {\n Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n\n } else {\n Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n if ((i + j) % 2 == 0)\n v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n }\n pw.println(v2);\n }\n\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class edu_1027_B {\n- static long ans = 1000000000;\n+public class GFG {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ Long n = new Long(sc.next()), i = 0L, j = 0L, v2 = 0L;\n+ int q = sc.nextInt();\n+ for (int k = 0; k < q; k++) {\n \n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n+ i = new Long(sc.next());\n+ j = new Long(sc.next());\n+ if (n % 2 == 0) {\n+ Long r = (i + j) % 2 == 1 ? ((n * n) / 2) : 0;\n+ v2 = ((n + (n % 2)) * (i - 1)) / 2 + (j / 2) + (j % 2) + r;\n \n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n+ } else {\n+ Long r1 = (i + j) % 2 == 1 ? (((n * n) + 1) / 2) : 0;\n+ if ((i + j) % 2 == 0)\n+ v2 = (n / 2) * ((i - 1) / 2) + ((n + 1) / 2) * (i / 2) + (j / 2) + (j % 2) + r1;\n+ else v2 = ((n / 2) * ((i) / 2)) + (((n + 1) / 2) * ((i - 1) / 2)) + (j / 2) + (j % 2) + r1;\n+ }\n+ pw.println(v2);\n }\n \n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[64];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- public static void main(String args[]) throws IOException {\n- Reader ob = new Reader();\n- long n = ob.nextLong();\n-\n- int q = ob.nextInt();\n- while (q != 0) {\n- long x = ob.nextLong();\n- long y = ob.nextLong();\n-\n- long ans = 0, end = 0;\n-\n- if ((x + y) % 2 == 0) System.out.println(((x - 1) * n + y + 1) / 2);\n- else {\n- if (n % 2 == 0) System.out.println(((n * n) / 2) + ((x - 1) * n + y + 1) / 2);\n- else System.out.println((((n * n) + 1) / 2) + ((x - 1) * n + y + 1) / 2);\n- }\n-\n- q--;\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.8124", "pair_id": "java_5789_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.7561} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n+import java.io.*;\n+import java.util.*;\n \n-public class newProgram5 {\n-\n- public static void main(String[] args) throws IOException {\n-\n- FastIO in = new FastIO();\n- Point a1 = new Point(in.nd(), in.nd());\n- Point a2 = new Point(in.nd(), in.nd());\n- Point a3 = new Point(in.nd(), in.nd());\n- Point a4 = new Point(in.nd(), in.nd());\n-\n- Point b1 = new Point(in.nd(), in.nd());\n- Point b2 = new Point(in.nd(), in.nd());\n- Point b3 = new Point(in.nd(), in.nd());\n- Point b4 = new Point(in.nd(), in.nd());\n-\n- if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n- == 2 * getArea(a1, a2, a3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n- == 2 * getArea(b1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a1, a2, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a2, a3, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a3, a4, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b1, b2)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b2, b3)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b3, b4)) {\n- System.out.println(\"Yes\");\n- } else if (lineIntersect(a4, a1, b4, b1)) {\n- System.out.println(\"Yes\");\n- } else {\n- System.out.println(\"No\");\n- }\n+public class C994 {\n+ static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n+ return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n \n- private static double getArea(Point a, Point b, Point c) {\n- double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n- return ans / 2.0;\n- }\n-\n- private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n- double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n- double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n- double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n- double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n- return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n- }\n-\n- static class FastIO {\n-\n- private final BufferedReader br;\n- private final BufferedWriter bw;\n- private String s[];\n- private int index;\n-\n- public FastIO() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n- s = br.readLine().split(\" \");\n- index = 0;\n+ public static void main(String args[]) throws IOException {\n+ Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int x11 = sc.nextInt();\n+ int y11 = sc.nextInt();\n+ int x12 = sc.nextInt();\n+ int y12 = sc.nextInt();\n+ int x13 = sc.nextInt();\n+ int y13 = sc.nextInt();\n+ int x14 = sc.nextInt();\n+ int y14 = sc.nextInt();\n+ double x1c = (x11 + x12 + x13 + x14) / 4.0;\n+ double y1c = (y11 + y12 + y13 + y14) / 4.0;\n+ int x21 = sc.nextInt();\n+ int y21 = sc.nextInt();\n+ int x22 = sc.nextInt();\n+ int y22 = sc.nextInt();\n+ int x23 = sc.nextInt();\n+ int y23 = sc.nextInt();\n+ int x24 = sc.nextInt();\n+ int y24 = sc.nextInt();\n+ double x2c = (x21 + x22 + x23 + x24) / 4.0;\n+ double y2c = (y21 + y22 + y23 + y24) / 4.0;\n+ double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n+ double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n+ if (a1\n+ == area(x11, y11, x12, y12, x21, y21)\n+ + area(x11, y11, x21, y21, x14, y14)\n+ + area(x21, y21, x12, y12, x13, y13)\n+ + area(x21, y21, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x22, y22)\n+ + area(x11, y11, x22, y22, x14, y14)\n+ + area(x22, y22, x12, y12, x13, y13)\n+ + area(x22, y22, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x23, y23)\n+ + area(x11, y11, x23, y23, x14, y14)\n+ + area(x23, y23, x12, y12, x13, y13)\n+ + area(x23, y23, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x24, y24)\n+ + area(x11, y11, x24, y24, x14, y14)\n+ + area(x24, y24, x12, y12, x13, y13)\n+ + area(x24, y24, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a1\n+ == area(x11, y11, x12, y12, x2c, y2c)\n+ + area(x11, y11, x2c, y2c, x14, y14)\n+ + area(x2c, y2c, x12, y12, x13, y13)\n+ + area(x2c, y2c, x14, y14, x13, y13)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x11, y11)\n+ + area(x21, y21, x11, y11, x24, y24)\n+ + area(x11, y11, x22, y22, x23, y23)\n+ + area(x11, y11, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x12, y12)\n+ + area(x21, y21, x12, y12, x24, y24)\n+ + area(x12, y12, x22, y22, x23, y23)\n+ + area(x12, y12, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x13, y13)\n+ + area(x21, y21, x13, y13, x24, y24)\n+ + area(x13, y13, x22, y22, x23, y23)\n+ + area(x13, y13, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x14, y14)\n+ + area(x21, y21, x14, y14, x24, y24)\n+ + area(x14, y14, x22, y22, x23, y23)\n+ + area(x14, y14, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n+ }\n+ if (a2\n+ == area(x21, y21, x22, y22, x1c, y1c)\n+ + area(x21, y21, x14, y14, x2c, y2c)\n+ + area(x1c, y1c, x22, y22, x23, y23)\n+ + area(x1c, y1c, x24, y24, x23, y23)) {\n+ pw.println(\"YES\");\n+ pw.close();\n+ return;\n }\n \n- public int ni() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nd() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nl() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- public String next() throws IOException {\n- return nextToken();\n- }\n-\n- public String nli() throws IOException {\n- try {\n- return br.readLine();\n- } catch (IOException ex) {\n-\n- }\n- return null;\n- }\n-\n- public int[] gia(int n) throws IOException {\n- int a[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[] gia(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- int a[] = new int[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n) throws IOException {\n- double a[] = new double[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public double[] gda(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- double a[] = new double[n];\n- for (int i = start; i < end; i++) {\n- a[i] = nd();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n) throws IOException {\n- long a[] = new long[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public long[] gla(int n, int start, int end) throws IOException {\n- validate(n, start, end);\n- long a[] = new long[n];\n- for (int i = start; i < end; i++) {\n- a[i] = ni();\n- }\n- return a;\n- }\n-\n- public int[][] gg(int n, int m) throws IOException {\n- int adja[][] = new int[n + 1][];\n- int from[] = new int[m];\n- int to[] = new int[m];\n- int count[] = new int[n + 1];\n- for (int i = 0; i < m; i++) {\n- from[i] = ni();\n- to[i] = ni();\n- count[from[i]]++;\n- count[to[i]]++;\n- }\n- for (int i = 0; i <= n; i++) {\n- adja[i] = new int[count[i]];\n- }\n- for (int i = 0; i < m; i++) {\n- adja[from[i]][--count[from[i]]] = to[i];\n- adja[to[i]][--count[to[i]]] = from[i];\n- }\n- return adja;\n- }\n-\n- public void print(String s) throws IOException {\n- bw.write(s);\n- bw.flush();\n- }\n-\n- public void println(String s) throws IOException {\n- bw.write(s);\n- bw.newLine();\n- bw.flush();\n- }\n-\n- private String nextToken() throws IndexOutOfBoundsException, IOException {\n- if (index == s.length) {\n- s = br.readLine().split(\" \");\n- index = 0;\n- }\n- return s[index++];\n- }\n-\n- private void validate(int n, int start, int end) {\n- if (start < 0 || end >= n) {\n- throw new IllegalArgumentException();\n- }\n- }\n+ pw.println(\"NO\");\n+ pw.close();\n }\n }\n-\n-class Point {\n-\n- double x, y;\n-\n- public Point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-}", "output": "SLOWER 4.4762", "pair_id": "java_4728_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 22.2574} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\n\npublic class B {\n\n static long N;\n\n public static void main(String[] args) {\n JS in = new JS();\n N = in.nextLong();\n int Q = in.nextInt();\n long colSt = (N * N) / 2;\n if ((N * N) % 2 == 1) colSt++;\n\n for (int q = 0; q < Q; q++) {\n int r = in.nextInt() - 1;\n int c = in.nextInt() - 1;\n\n if ((r + c) % 2 == 0) {\n long o = N / 2;\n long bef = r;\n long nBef = (bef * o);\n if (N % 2 == 1) {\n long even = bef / 2;\n if (bef % 2 == 1) even++;\n nBef += even;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc);\n } else {\n long e = N / 2;\n long bef = r;\n long nBef = (bef * e);\n if (N % 2 == 1) {\n long odd = bef / 2;\n nBef += odd;\n }\n if (r == 0) nBef = 0;\n long cc = c / 2 + 1;\n\n System.out.println(nBef + cc + colSt);\n }\n }\n }\n\n static class JS {\n public int BS = 1 << 16;\n public char NC = (char) 0;\n byte[] buf = new byte[BS];\n int bId = 0, size = 0;\n char c = NC;\n double num = 1;\n BufferedInputStream in;\n\n public JS() {\n in = new BufferedInputStream(System.in, BS);\n }\n\n public JS(String s) throws FileNotFoundException {\n in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n }\n\n public char nextChar() {\n while (bId == size) {\n try {\n size = in.read(buf);\n } catch (Exception e) {\n return NC;\n }\n if (size == -1) return NC;\n bId = 0;\n }\n return (char) buf[bId++];\n }\n\n public int nextInt() {\n return (int) nextLong();\n }\n\n public long nextLong() {\n num = 1;\n boolean neg = false;\n if (c == NC) c = nextChar();\n for (; (c < '0' || c > '9'); c = nextChar()) {\n if (c == '-') neg = true;\n }\n long res = 0;\n for (; c >= '0' && c <= '9'; c = nextChar()) {\n res = (res << 3) + (res << 1) + c - '0';\n num *= 10;\n }\n return neg ? -res : res;\n }\n\n public double nextDouble() {\n while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n boolean neg = c == '-';\n if (neg) c = nextChar();\n boolean fl = c == '.';\n double cur = nextLong();\n if (fl) return neg ? -cur / num : cur / num;\n if (c == '.') {\n double next = nextLong();\n return neg ? -cur - next / num : cur + next / num;\n } else return neg ? -cur : cur;\n }\n\n public String next() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c > 32) {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public String nextLine() {\n StringBuilder res = new StringBuilder();\n while (c <= 32) c = nextChar();\n while (c != '\\n') {\n res.append(c);\n c = nextChar();\n }\n return res.toString();\n }\n\n public boolean hasNext() {\n if (c > 32) return true;\n while (true) {\n c = nextChar();\n if (c == NC) return false;\n else if (c > 32) return true;\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class B {\n-\n- static long N;\n-\n+public class second {\n public static void main(String[] args) {\n- JS in = new JS();\n- N = in.nextLong();\n- int Q = in.nextInt();\n- long colSt = (N * N) / 2;\n- if ((N * N) % 2 == 1) colSt++;\n-\n- for (int q = 0; q < Q; q++) {\n- int r = in.nextInt() - 1;\n- int c = in.nextInt() - 1;\n-\n- if ((r + c) % 2 == 0) {\n- long o = N / 2;\n- long bef = r;\n- long nBef = (bef * o);\n- if (N % 2 == 1) {\n- long even = bef / 2;\n- if (bef % 2 == 1) even++;\n- nBef += even;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc);\n- } else {\n- long e = N / 2;\n- long bef = r;\n- long nBef = (bef * e);\n- if (N % 2 == 1) {\n- long odd = bef / 2;\n- nBef += odd;\n- }\n- if (r == 0) nBef = 0;\n- long cc = c / 2 + 1;\n-\n- System.out.println(nBef + cc + colSt);\n- }\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n- }\n-\n- static class JS {\n- public int BS = 1 << 16;\n- public char NC = (char) 0;\n- byte[] buf = new byte[BS];\n- int bId = 0, size = 0;\n- char c = NC;\n- double num = 1;\n- BufferedInputStream in;\n-\n- public JS() {\n- in = new BufferedInputStream(System.in, BS);\n- }\n-\n- public JS(String s) throws FileNotFoundException {\n- in = new BufferedInputStream(new FileInputStream(new File(s)), BS);\n- }\n-\n- public char nextChar() {\n- while (bId == size) {\n- try {\n- size = in.read(buf);\n- } catch (Exception e) {\n- return NC;\n- }\n- if (size == -1) return NC;\n- bId = 0;\n- }\n- return (char) buf[bId++];\n- }\n-\n- public int nextInt() {\n- return (int) nextLong();\n- }\n-\n- public long nextLong() {\n- num = 1;\n- boolean neg = false;\n- if (c == NC) c = nextChar();\n- for (; (c < '0' || c > '9'); c = nextChar()) {\n- if (c == '-') neg = true;\n- }\n- long res = 0;\n- for (; c >= '0' && c <= '9'; c = nextChar()) {\n- res = (res << 3) + (res << 1) + c - '0';\n- num *= 10;\n- }\n- return neg ? -res : res;\n- }\n-\n- public double nextDouble() {\n- while (c != '.' && c != '-' && (c < '0' || c > '9')) c = nextChar();\n- boolean neg = c == '-';\n- if (neg) c = nextChar();\n- boolean fl = c == '.';\n- double cur = nextLong();\n- if (fl) return neg ? -cur / num : cur / num;\n- if (c == '.') {\n- double next = nextLong();\n- return neg ? -cur - next / num : cur + next / num;\n- } else return neg ? -cur : cur;\n- }\n-\n- public String next() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c > 32) {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- StringBuilder res = new StringBuilder();\n- while (c <= 32) c = nextChar();\n- while (c != '\\n') {\n- res.append(c);\n- c = nextChar();\n- }\n- return res.toString();\n- }\n-\n- public boolean hasNext() {\n- if (c > 32) return true;\n- while (true) {\n- c = nextChar();\n- if (c == NC) return false;\n- else if (c > 32) return true;\n- }\n- }\n+ pw.flush();\n }\n }", "output": "SLOWER 0.984", "pair_id": "java_5798_reversed", "problem_id": "1027_B", "language": "java", "direction": "reversed", "speedup_ratio": 1.9779} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n\n System.out.println((X - A) % B);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n+ public static void main(String[] args) {\n \n- public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n+\n int X = sc.nextInt();\n int A = sc.nextInt();\n int B = sc.nextInt();\n+\n System.out.println((X - A) % B);\n }\n }", "output": "FASTER 0.1384", "pair_id": "java_6635_forward", "problem_id": "p03447", "language": "java", "direction": "forward", "speedup_ratio": 1.1007} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\n\npublic class newProgram5 {\n\n public static void main(String[] args) throws IOException {\n\n FastIO in = new FastIO();\n Point a1 = new Point(in.nd(), in.nd());\n Point a2 = new Point(in.nd(), in.nd());\n Point a3 = new Point(in.nd(), in.nd());\n Point a4 = new Point(in.nd(), in.nd());\n\n Point b1 = new Point(in.nd(), in.nd());\n Point b2 = new Point(in.nd(), in.nd());\n Point b3 = new Point(in.nd(), in.nd());\n Point b4 = new Point(in.nd(), in.nd());\n\n if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n == 2 * getArea(a1, a2, a3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n == 2 * getArea(b1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a1, a2, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a2, a3, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a3, a4, b4, b1)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b1, b2)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b2, b3)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b3, b4)) {\n System.out.println(\"Yes\");\n } else if (lineIntersect(a4, a1, b4, b1)) {\n System.out.println(\"Yes\");\n } else {\n System.out.println(\"No\");\n }\n }\n\n private static double getArea(Point a, Point b, Point c) {\n double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n return ans / 2.0;\n }\n\n private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n }\n\n static class FastIO {\n\n private final BufferedReader br;\n private final BufferedWriter bw;\n private String s[];\n private int index;\n\n public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n s = br.readLine().split(\" \");\n index = 0;\n }\n\n public int ni() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nd() throws IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nl() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n public String next() throws IOException {\n return nextToken();\n }\n\n public String nli() throws IOException {\n try {\n return br.readLine();\n } catch (IOException ex) {\n\n }\n return null;\n }\n\n public int[] gia(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[] gia(int n, int start, int end) throws IOException {\n validate(n, start, end);\n int a[] = new int[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public double[] gda(int n) throws IOException {\n double a[] = new double[n];\n for (int i = 0; i < n; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public double[] gda(int n, int start, int end) throws IOException {\n validate(n, start, end);\n double a[] = new double[n];\n for (int i = start; i < end; i++) {\n a[i] = nd();\n }\n return a;\n }\n\n public long[] gla(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public long[] gla(int n, int start, int end) throws IOException {\n validate(n, start, end);\n long a[] = new long[n];\n for (int i = start; i < end; i++) {\n a[i] = ni();\n }\n return a;\n }\n\n public int[][] gg(int n, int m) throws IOException {\n int adja[][] = new int[n + 1][];\n int from[] = new int[m];\n int to[] = new int[m];\n int count[] = new int[n + 1];\n for (int i = 0; i < m; i++) {\n from[i] = ni();\n to[i] = ni();\n count[from[i]]++;\n count[to[i]]++;\n }\n for (int i = 0; i <= n; i++) {\n adja[i] = new int[count[i]];\n }\n for (int i = 0; i < m; i++) {\n adja[from[i]][--count[from[i]]] = to[i];\n adja[to[i]][--count[to[i]]] = from[i];\n }\n return adja;\n }\n\n public void print(String s) throws IOException {\n bw.write(s);\n bw.flush();\n }\n\n public void println(String s) throws IOException {\n bw.write(s);\n bw.newLine();\n bw.flush();\n }\n\n private String nextToken() throws IndexOutOfBoundsException, IOException {\n if (index == s.length) {\n s = br.readLine().split(\" \");\n index = 0;\n }\n return s[index++];\n }\n\n private void validate(int n, int start, int end) {\n if (start < 0 || end >= n) {\n throw new IllegalArgumentException();\n }\n }\n }\n}\n\nclass Point {\n\n double x, y;\n\n public Point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-import java.util.StringTokenizer;\n-\n-public class C {\n- static class FastWriter {\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+\n+public class newProgram5 {\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ FastIO in = new FastIO();\n+ Point a1 = new Point(in.nd(), in.nd());\n+ Point a2 = new Point(in.nd(), in.nd());\n+ Point a3 = new Point(in.nd(), in.nd());\n+ Point a4 = new Point(in.nd(), in.nd());\n+\n+ Point b1 = new Point(in.nd(), in.nd());\n+ Point b2 = new Point(in.nd(), in.nd());\n+ Point b3 = new Point(in.nd(), in.nd());\n+ Point b4 = new Point(in.nd(), in.nd());\n+\n+ if (getArea(a1, a2, b1) + getArea(a2, a3, b1) + getArea(a3, a4, b1) + getArea(a4, a1, b1)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b2) + getArea(a2, a3, b2) + getArea(a3, a4, b2) + getArea(a4, a1, b2)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b4) + getArea(a2, a3, b4) + getArea(a3, a4, b4) + getArea(a4, a1, b4)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(a1, a2, b3) + getArea(a2, a3, b3) + getArea(a3, a4, b3) + getArea(a4, a1, b3)\n+ == 2 * getArea(a1, a2, a3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a3) + getArea(b2, b3, a3) + getArea(b3, b4, a3) + getArea(b4, b1, a3)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a1) + getArea(b2, b3, a1) + getArea(b3, b4, a1) + getArea(b4, b1, a1)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a2) + getArea(b2, b3, a2) + getArea(b3, b4, a2) + getArea(b4, b1, a2)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (getArea(b1, b2, a4) + getArea(b2, b3, a4) + getArea(b3, b4, a4) + getArea(b4, b1, a4)\n+ == 2 * getArea(b1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a1, a2, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a2, a3, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a3, a4, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b1, b2)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b2, b3)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b3, b4)) {\n+ System.out.println(\"Yes\");\n+ } else if (lineIntersect(a4, a1, b4, b1)) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ System.out.println(\"No\");\n+ }\n+ }\n+\n+ private static double getArea(Point a, Point b, Point c) {\n+ double ans = Math.abs(((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))));\n+ return ans / 2.0;\n+ }\n+\n+ private static boolean lineIntersect(Point a, Point b, Point c, Point d) {\n+ double ans1 = a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y);\n+ double ans2 = a.x * (b.y - d.y) + b.x * (d.y - a.y) + d.x * (a.y - b.y);\n+ double ans3 = c.x * (d.y - a.y) + d.x * (a.y - c.y) + a.x * (c.y - d.y);\n+ double ans4 = c.x * (d.y - b.y) + d.x * (b.y - c.y) + b.x * (c.y - d.y);\n+ return ans1 * ans2 <= 0 && ans3 * ans4 <= 0;\n+ }\n+\n+ static class FastIO {\n+\n+ private final BufferedReader br;\n private final BufferedWriter bw;\n-\n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n- }\n-\n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n- }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n- }\n-\n- public void close() throws IOException {\n- bw.close();\n- }\n- }\n-\n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n+ private String s[];\n+ private int index;\n+\n+ public FastIO() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n+ bw = new BufferedWriter(new OutputStreamWriter(System.out, \"UTF-8\"));\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+\n+ public int ni() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nd() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nl() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ public String next() throws IOException {\n+ return nextToken();\n+ }\n+\n+ public String nli() throws IOException {\n try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n- }\n- }\n- }\n-\n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n- }\n-\n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ return br.readLine();\n+ } catch (IOException ex) {\n+\n+ }\n+ return null;\n+ }\n+\n+ public int[] gia(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[] gia(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ int a[] = new int[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n) throws IOException {\n+ double a[] = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public double[] gda(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ double a[] = new double[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = nd();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public long[] gla(int n, int start, int end) throws IOException {\n+ validate(n, start, end);\n+ long a[] = new long[n];\n+ for (int i = start; i < end; i++) {\n+ a[i] = ni();\n+ }\n+ return a;\n+ }\n+\n+ public int[][] gg(int n, int m) throws IOException {\n+ int adja[][] = new int[n + 1][];\n+ int from[] = new int[m];\n+ int to[] = new int[m];\n+ int count[] = new int[n + 1];\n+ for (int i = 0; i < m; i++) {\n+ from[i] = ni();\n+ to[i] = ni();\n+ count[from[i]]++;\n+ count[to[i]]++;\n+ }\n+ for (int i = 0; i <= n; i++) {\n+ adja[i] = new int[count[i]];\n+ }\n+ for (int i = 0; i < m; i++) {\n+ adja[from[i]][--count[from[i]]] = to[i];\n+ adja[to[i]][--count[to[i]]] = from[i];\n+ }\n+ return adja;\n+ }\n+\n+ public void print(String s) throws IOException {\n+ bw.write(s);\n+ bw.flush();\n+ }\n+\n+ public void println(String s) throws IOException {\n+ bw.write(s);\n+ bw.newLine();\n+ bw.flush();\n+ }\n+\n+ private String nextToken() throws IndexOutOfBoundsException, IOException {\n+ if (index == s.length) {\n+ s = br.readLine().split(\" \");\n+ index = 0;\n+ }\n+ return s[index++];\n+ }\n+\n+ private void validate(int n, int start, int end) {\n+ if (start < 0 || end >= n) {\n+ throw new IllegalArgumentException();\n+ }\n+ }\n }\n }\n+\n+class Point {\n+\n+ double x, y;\n+\n+ public Point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+}", "output": "SLOWER 0.147", "pair_id": "java_4713_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.1073} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\nimport java.nio.charset.Charset;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n LightScanner in = new LightScanner(inputStream);\n LightWriter out = new LightWriter(outputStream);\n E1Or2 solver = new E1Or2();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class E1Or2 {\n public void solve(int testNumber, LightScanner in, LightWriter out) {\n\n int n = in.ints(), m = in.ints();\n IntUnionFind uf = new IntUnionFind(n);\n for (int i = 0; i < m; i++) {\n int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n uf.union(x, y);\n }\n out.ans(uf.size()).ln();\n }\n }\n\n static class LightScanner {\n private BufferedReader reader = null;\n private StringTokenizer tokenizer = null;\n\n public LightScanner(InputStream in) {\n reader = new BufferedReader(new InputStreamReader(in));\n }\n\n public String string() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int ints() {\n return Integer.parseInt(string());\n }\n }\n\n static final class IntUnionFind {\n private int groups;\n private final int[] nodes;\n private final int[] rank;\n\n public IntUnionFind(int n) {\n groups = n;\n nodes = new int[n];\n Arrays.fill(nodes, -1);\n rank = new int[n];\n }\n\n public int find(int i) {\n int ans = nodes[i];\n if (ans < 0) {\n return i;\n } else {\n return nodes[i] = find(ans);\n }\n }\n\n public int size() {\n return groups;\n }\n\n public boolean union(int x, int y) {\n x = find(x);\n y = find(y);\n if (x == y) {\n return false;\n } else if (rank[x] < rank[y]) {\n nodes[y] += nodes[x];\n nodes[x] = y;\n } else if (rank[x] == rank[y]) {\n rank[x]++;\n nodes[x] += nodes[y];\n nodes[y] = x;\n } else {\n nodes[x] += nodes[y];\n nodes[y] = x;\n }\n groups--;\n return true;\n }\n }\n\n static class LightWriter implements AutoCloseable {\n private final Writer out;\n private boolean autoflush = false;\n private boolean breaked = true;\n\n public LightWriter(Writer out) {\n this.out = out;\n }\n\n public LightWriter(OutputStream out) {\n this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n }\n\n public LightWriter print(char c) {\n try {\n out.write(c);\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter print(String s) {\n try {\n out.write(s, 0, s.length());\n breaked = false;\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n return this;\n }\n\n public LightWriter ans(String s) {\n if (!breaked) {\n print(' ');\n }\n return print(s);\n }\n\n public LightWriter ans(int i) {\n return ans(Integer.toString(i));\n }\n\n public LightWriter ln() {\n print(System.lineSeparator());\n breaked = true;\n if (autoflush) {\n try {\n out.flush();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n return this;\n }\n\n public void close() {\n try {\n out.close();\n } catch (IOException ex) {\n throw new UncheckedIOException(ex);\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int M = sc.nextInt();\n List[] edges = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n edges[i] = new ArrayList();\n }\n for (int i = 0; i < M; i++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n int w = sc.nextInt();\n edges[x - 1].add(y - 1);\n edges[y - 1].add(x - 1);\n }\n boolean[] visited = new boolean[N];\n int ans = 0;\n for (int i = 0; i < N; i++) {\n if (visited[i]) continue;\n LinkedList queue = new LinkedList();\n queue.offerLast(i);\n visited[i] = true;\n ans++;\n while (queue.size() > 0) {\n int v = queue.pollFirst();\n for (int w : edges[v]) {\n if (visited[w]) continue;\n queue.offerLast(w);\n visited[w] = true;\n }\n }\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n-import java.nio.charset.Charset;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- LightScanner in = new LightScanner(inputStream);\n- LightWriter out = new LightWriter(outputStream);\n- E1Or2 solver = new E1Or2();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class E1Or2 {\n- public void solve(int testNumber, LightScanner in, LightWriter out) {\n-\n- int n = in.ints(), m = in.ints();\n- IntUnionFind uf = new IntUnionFind(n);\n- for (int i = 0; i < m; i++) {\n- int x = in.ints() - 1, y = in.ints() - 1, z = in.ints();\n- uf.union(x, y);\n- }\n- out.ans(uf.size()).ln();\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ int M = sc.nextInt();\n+ List[] edges = new ArrayList[N];\n+ for (int i = 0; i < N; i++) {\n+ edges[i] = new ArrayList();\n }\n- }\n-\n- static class LightScanner {\n- private BufferedReader reader = null;\n- private StringTokenizer tokenizer = null;\n-\n- public LightScanner(InputStream in) {\n- reader = new BufferedReader(new InputStreamReader(in));\n+ for (int i = 0; i < M; i++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ int w = sc.nextInt();\n+ edges[x - 1].add(y - 1);\n+ edges[y - 1].add(x - 1);\n }\n-\n- public String string() {\n- if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n+ boolean[] visited = new boolean[N];\n+ int ans = 0;\n+ for (int i = 0; i < N; i++) {\n+ if (visited[i]) continue;\n+ LinkedList queue = new LinkedList();\n+ queue.offerLast(i);\n+ visited[i] = true;\n+ ans++;\n+ while (queue.size() > 0) {\n+ int v = queue.pollFirst();\n+ for (int w : edges[v]) {\n+ if (visited[w]) continue;\n+ queue.offerLast(w);\n+ visited[w] = true;\n }\n }\n- return tokenizer.nextToken();\n }\n-\n- public int ints() {\n- return Integer.parseInt(string());\n- }\n- }\n-\n- static final class IntUnionFind {\n- private int groups;\n- private final int[] nodes;\n- private final int[] rank;\n-\n- public IntUnionFind(int n) {\n- groups = n;\n- nodes = new int[n];\n- Arrays.fill(nodes, -1);\n- rank = new int[n];\n- }\n-\n- public int find(int i) {\n- int ans = nodes[i];\n- if (ans < 0) {\n- return i;\n- } else {\n- return nodes[i] = find(ans);\n- }\n- }\n-\n- public int size() {\n- return groups;\n- }\n-\n- public boolean union(int x, int y) {\n- x = find(x);\n- y = find(y);\n- if (x == y) {\n- return false;\n- } else if (rank[x] < rank[y]) {\n- nodes[y] += nodes[x];\n- nodes[x] = y;\n- } else if (rank[x] == rank[y]) {\n- rank[x]++;\n- nodes[x] += nodes[y];\n- nodes[y] = x;\n- } else {\n- nodes[x] += nodes[y];\n- nodes[y] = x;\n- }\n- groups--;\n- return true;\n- }\n- }\n-\n- static class LightWriter implements AutoCloseable {\n- private final Writer out;\n- private boolean autoflush = false;\n- private boolean breaked = true;\n-\n- public LightWriter(Writer out) {\n- this.out = out;\n- }\n-\n- public LightWriter(OutputStream out) {\n- this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));\n- }\n-\n- public LightWriter print(char c) {\n- try {\n- out.write(c);\n- breaked = false;\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- return this;\n- }\n-\n- public LightWriter print(String s) {\n- try {\n- out.write(s, 0, s.length());\n- breaked = false;\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- return this;\n- }\n-\n- public LightWriter ans(String s) {\n- if (!breaked) {\n- print(' ');\n- }\n- return print(s);\n- }\n-\n- public LightWriter ans(int i) {\n- return ans(Integer.toString(i));\n- }\n-\n- public LightWriter ln() {\n- print(System.lineSeparator());\n- breaked = true;\n- if (autoflush) {\n- try {\n- out.flush();\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- }\n- return this;\n- }\n-\n- public void close() {\n- try {\n- out.close();\n- } catch (IOException ex) {\n- throw new UncheckedIOException(ex);\n- }\n- }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 2.864", "pair_id": "java_12876_forward", "problem_id": "p03045", "language": "java", "direction": "forward", "speedup_ratio": 7.2805} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class DMinimalnayaTriangulyaciya {\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long ans = 0;\n for (int i = 2; i < n; i++) {\n ans += i * (i + 1);\n }\n out.println(ans);\n }\n }\n\n static class InputReader {\n\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream), 32768);\n tokenizer = null;\n }\n\n public String next() {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n \n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- DMinimalnayaTriangulyaciya solver = new DMinimalnayaTriangulyaciya();\n- solver.solve(1, in, out);\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n+ }\n+\n+ out.println(weight);\n+\n+ in.close();\n out.close();\n }\n-\n- static class DMinimalnayaTriangulyaciya {\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i < n; i++) {\n- ans += i * (i + 1);\n- }\n- out.println(ans);\n- }\n- }\n-\n- static class InputReader {\n-\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream), 32768);\n- tokenizer = null;\n- }\n-\n- public String next() {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- try {\n- tokenizer = new StringTokenizer(reader.readLine());\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return tokenizer.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n- }\n }", "output": "SLOWER 5.1043", "pair_id": "java_182_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 34.3999} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int num = Integer.parseInt(sc.next());\n String str = sc.next();\n\n int res = 0;\n for (int len = num; len > 0; len--) {\n int[] dp = new int[num];\n for (int i = num - len - 1; i >= 0; i--) {\n if (str.charAt(i) == str.charAt(i + len)) {\n dp[i] = Math.min(dp[i + 1] + 1, len);\n res = Math.max(res, dp[i]);\n } else {\n dp[i] = 0;\n }\n }\n }\n\n System.out.println(res);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.HashMap;\n-import java.util.Random;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n+ Scanner sc = new Scanner(System.in);\n+ int num = Integer.parseInt(sc.next());\n+ String str = sc.next();\n \n- int N = scanner.nextInt();\n- char[] s = scanner.next().toCharArray();\n- int[] M = {999_999_937, 1_000_000_007};\n- int B = new Random().nextInt(999_999_937);\n- int left = 0;\n- int right = N / 2 + 1;\n- while (right - left > 1) {\n- int mid = (left + right) / 2;\n- if (possible(s, mid, N, B, M)) left = mid;\n- else right = mid;\n- }\n- System.out.println(left);\n- }\n-\n- private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n- long[] bn = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- bn[i] = 1;\n- for (int j = 0; j < K - 1; j++) {\n- bn[i] *= B;\n- bn[i] %= M[i];\n+ int res = 0;\n+ for (int len = num; len > 0; len--) {\n+ int[] dp = new int[num];\n+ for (int i = num - len - 1; i >= 0; i--) {\n+ if (str.charAt(i) == str.charAt(i + len)) {\n+ dp[i] = Math.min(dp[i + 1] + 1, len);\n+ res = Math.max(res, dp[i]);\n+ } else {\n+ dp[i] = 0;\n+ }\n }\n }\n \n- HashMap occurrences = new HashMap<>();\n- long[] hash = new long[M.length];\n- for (int i = 0; i < M.length; i++) {\n- hash[i] = hash(s, K, B, M[i]);\n- }\n- occurrences.put(new Tuple(hash), 0);\n- for (int i = 1; i <= N - K; i++) {\n- for (int j = 0; j < M.length; j++) {\n- hash[j] -= s[i - 1] * bn[j] % M[j];\n- if (hash[j] < 0) hash[j] += M[j];\n- hash[j] *= B;\n- hash[j] %= M[j];\n- hash[j] += s[i + K - 1];\n- if (hash[j] >= M[j]) hash[j] -= M[j];\n- }\n- Tuple key = new Tuple(hash);\n- if (occurrences.containsKey(key)) {\n- if (occurrences.get(key) + K <= i) return true;\n- } else occurrences.put(key, i);\n- }\n- return false;\n- }\n-\n- private static long hash(char[] s, int len, int B, int M) {\n- if (s.length < len)\n- throw new IllegalArgumentException(\n- \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n- long hash = 0;\n- for (int i = 0; i < len; i++) {\n- hash *= B;\n- hash %= M;\n- hash += s[i];\n- if (hash >= M) hash -= M;\n- }\n- return hash;\n- }\n-\n- private static class Tuple {\n- private final long[] elements;\n-\n- private Tuple(long[] elements) {\n- this.elements = Arrays.copyOf(elements, elements.length);\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Tuple tuple = (Tuple) o;\n- return Arrays.equals(elements, tuple.elements);\n- }\n-\n- @Override\n- public int hashCode() {\n- return Arrays.hashCode(elements);\n- }\n+ System.out.println(res);\n }\n }", "output": "FASTER 0.0894", "pair_id": "java_3832_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.0639} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static HashMap map;\n static HashMap pos;\n\n static void update(long value, int temp, int i) {\n if (!map.containsKey(value)) {\n map.put(value, temp);\n pos.put(value, i);\n } else {\n int val = map.get(value);\n if (temp > val) {\n map.put(value, temp);\n pos.put(value, i);\n }\n }\n }\n\n static int det(long temp) {\n if (!map.containsKey(temp)) return 0;\n return map.get(temp);\n }\n\n public static void main(String[] args) throws Exception {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n int n = Integer.parseInt(br.readLine());\n StringTokenizer st;\n map = new HashMap<>();\n pos = new HashMap<>();\n long mod = (long) 1E9 + 7;\n int ans = 0;\n int single = -1;\n int next = -1;\n int postemp = -1;\n for (int i = 1; i <= n; i++) {\n st = new StringTokenizer(br.readLine());\n int a = Integer.parseInt(st.nextToken());\n int b = Integer.parseInt(st.nextToken());\n int c = Integer.parseInt(st.nextToken());\n int min = Math.min(a, Math.min(b, c));\n if (ans < min) {\n ans = min;\n single = i;\n next = -1;\n }\n int val = det(Math.min(a, b) * mod + Math.max(a, b));\n if (val > 0) {\n postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n val = Math.min(a, Math.min(b, val + c));\n if (ans < val) {\n ans = val;\n single = i;\n next = postemp;\n }\n }\n int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n if (val1 > 0) {\n postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n val1 = Math.min(a, Math.min(c, b + val1));\n if (ans < val1) {\n ans = val1;\n single = i;\n next = postemp;\n }\n }\n int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n if (val2 > 0) {\n postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n val2 = Math.min(b, Math.min(c, a + val2));\n if (ans < val2) {\n ans = val2;\n single = i;\n next = postemp;\n }\n }\n update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n }\n if (next == -1) {\n System.out.println(\"1\");\n System.out.println(single);\n return;\n }\n System.out.println(\"2\");\n System.out.println(single + \" \" + next);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\nimport java.util.TreeMap;\n\npublic class ProblemD {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt(), a[] = new int[3];\n int ans = 0, k[] = new int[2];\n TreeMap map = new TreeMap<>();\n for (int i = 0; i < n; i++) {\n a[0] = sc.nextInt();\n a[1] = sc.nextInt();\n a[2] = sc.nextInt();\n Arrays.sort(a);\n\n if (!map.containsKey(new Pair(a[1], a[2]))) {\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n if (ans < a[0]) {\n ans = a[0];\n k[0] = i;\n k[1] = -1;\n }\n } else {\n Pair x = map.get(new Pair(a[1], a[2]));\n if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n k[0] = x.first;\n k[1] = i;\n }\n if (x.second < a[0]) {\n map.remove(x);\n map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n }\n }\n }\n\n if (k[1] == -1) {\n pw.println(1);\n pw.println(k[0] + 1);\n } else {\n pw.println(2);\n pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n }\n pw.flush();\n pw.close();\n }\n\n static class Pair implements Comparable {\n int first, second;\n\n public Pair(int f, int s) {\n first = f;\n second = s;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return first == pair.first ? second - pair.second : first - pair.first;\n }\n\n public String toString() {\n return (\"First: \" + first + \" second: \" + second);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n+import java.util.TreeMap;\n \n-public class Main {\n- static HashMap map;\n- static HashMap pos;\n+public class ProblemD {\n \n- static void update(long value, int temp, int i) {\n- if (!map.containsKey(value)) {\n- map.put(value, temp);\n- pos.put(value, i);\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt(), a[] = new int[3];\n+ int ans = 0, k[] = new int[2];\n+ TreeMap map = new TreeMap<>();\n+ for (int i = 0; i < n; i++) {\n+ a[0] = sc.nextInt();\n+ a[1] = sc.nextInt();\n+ a[2] = sc.nextInt();\n+ Arrays.sort(a);\n+\n+ if (!map.containsKey(new Pair(a[1], a[2]))) {\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ if (ans < a[0]) {\n+ ans = a[0];\n+ k[0] = i;\n+ k[1] = -1;\n+ }\n+ } else {\n+ Pair x = map.get(new Pair(a[1], a[2]));\n+ if (ans < Math.min(Math.min(x.second + a[0], a[1]), a[2])) {\n+ ans = Math.min(Math.min(x.second + a[0], a[1]), a[2]);\n+ k[0] = x.first;\n+ k[1] = i;\n+ }\n+ if (x.second < a[0]) {\n+ map.remove(x);\n+ map.put(new Pair(a[1], a[2]), new Pair(i, a[0]));\n+ }\n+ }\n+ }\n+\n+ if (k[1] == -1) {\n+ pw.println(1);\n+ pw.println(k[0] + 1);\n } else {\n- int val = map.get(value);\n- if (temp > val) {\n- map.put(value, temp);\n- pos.put(value, i);\n- }\n+ pw.println(2);\n+ pw.println(k[0] + 1 + \" \" + (k[1] + 1));\n+ }\n+ pw.flush();\n+ pw.close();\n+ }\n+\n+ static class Pair implements Comparable {\n+ int first, second;\n+\n+ public Pair(int f, int s) {\n+ first = f;\n+ second = s;\n+ }\n+\n+ @Override\n+ public int compareTo(Pair pair) {\n+ return first == pair.first ? second - pair.second : first - pair.first;\n+ }\n+\n+ public String toString() {\n+ return (\"First: \" + first + \" second: \" + second);\n }\n }\n \n- static int det(long temp) {\n- if (!map.containsKey(temp)) return 0;\n- return map.get(temp);\n- }\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- public static void main(String[] args) throws Exception {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- int n = Integer.parseInt(br.readLine());\n- StringTokenizer st;\n- map = new HashMap<>();\n- pos = new HashMap<>();\n- long mod = (long) 1E9 + 7;\n- int ans = 0;\n- int single = -1;\n- int next = -1;\n- int postemp = -1;\n- for (int i = 1; i <= n; i++) {\n- st = new StringTokenizer(br.readLine());\n- int a = Integer.parseInt(st.nextToken());\n- int b = Integer.parseInt(st.nextToken());\n- int c = Integer.parseInt(st.nextToken());\n- int min = Math.min(a, Math.min(b, c));\n- if (ans < min) {\n- ans = min;\n- single = i;\n- next = -1;\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n }\n- int val = det(Math.min(a, b) * mod + Math.max(a, b));\n- if (val > 0) {\n- postemp = pos.get(Math.min(a, b) * mod + Math.max(a, b));\n- val = Math.min(a, Math.min(b, val + c));\n- if (ans < val) {\n- ans = val;\n- single = i;\n- next = postemp;\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n }\n- }\n- int val1 = det(Math.min(a, c) * mod + Math.max(a, c));\n- if (val1 > 0) {\n- postemp = pos.get(Math.min(a, c) * mod + Math.max(a, c));\n- val1 = Math.min(a, Math.min(c, b + val1));\n- if (ans < val1) {\n- ans = val1;\n- single = i;\n- next = postemp;\n- }\n- }\n- int val2 = det(Math.min(b, c) * mod + Math.max(b, c));\n- if (val2 > 0) {\n- postemp = pos.get(Math.min(b, c) * mod + Math.max(b, c));\n- val2 = Math.min(b, Math.min(c, a + val2));\n- if (ans < val2) {\n- ans = val2;\n- single = i;\n- next = postemp;\n- }\n- }\n- update(Math.min(a, b) * mod + Math.max(a, b), c, i);\n- update(Math.min(a, c) * mod + Math.max(a, c), b, i);\n- update(Math.min(c, b) * mod + Math.max(c, b), a, i);\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n }\n- if (next == -1) {\n- System.out.println(\"1\");\n- System.out.println(single);\n- return;\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n- System.out.println(\"2\");\n- System.out.println(single + \" \" + next);\n }\n }", "output": "SLOWER 0.7316", "pair_id": "java_9721_reversed", "problem_id": "733_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.6605} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Test {\n\n private static Scanner s;\n public static int[] arr;\n public static int[] a = new int[3];\n\n public static void main(String[] args) {\n s = new Scanner(System.in);\n int[] x_a = new int[4];\n int[] y_a = new int[4];\n int[] x = new int[2];\n x[0] = Integer.MAX_VALUE;\n x[1] = Integer.MIN_VALUE;\n int[] y = new int[2];\n y[0] = Integer.MAX_VALUE;\n y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n x_a[i] = s.nextInt();\n y_a[i] = s.nextInt();\n x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n }\n int[] x_b = new int[4];\n int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n x_b[i] = s.nextInt();\n y_b[i] = s.nextInt();\n }\n boolean ans = false;\n for (int i = 0; i < 4; i++) {\n int tmpX = x_b[i];\n int tmpY = y_b[i];\n if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) {\n System.out.println(\"Yes\");\n } else {\n int[] tmpx = new int[4];\n int[] tmpy = new int[4];\n int[] tmpx_b = new int[4];\n int[] tmpy_b = new int[4];\n int[] x1 = new int[2];\n x1[0] = Integer.MAX_VALUE;\n x1[1] = Integer.MIN_VALUE;\n int[] y1 = new int[2];\n y1[0] = Integer.MAX_VALUE;\n y1[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n tmpx[i] = x_a[i] + y_a[i];\n tmpy[i] = x_a[i] - y_a[i];\n tmpx_b[i] = x_b[i] + y_b[i];\n tmpy_b[i] = x_b[i] - y_b[i];\n\n x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n }\n\n for (int i = 0; i < 4; i++) {\n int tmpX = tmpx[i];\n int tmpY = tmpy[i];\n if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n else {\n ans = true;\n break;\n }\n }\n if (ans) System.out.println(\"Yes\");\n else {\n int midx = (x_b[0] + x_b[2]) / 2;\n int midy = (y_b[0] + y_b[2]) / 2;\n if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n System.out.println(\"No\");\n } else {\n ans = true;\n System.out.println(\"Yes\");\n }\n }\n }\n }\n\n public static class knights {\n public int str;\n public long coins;\n public long maxCoins;\n\n public knights(int strength) {\n this.str = strength;\n this.coins = 0;\n this.maxCoins = 0;\n }\n\n public void setCoins(long money) {\n this.coins = money;\n }\n }\n\n public static int maxribbons(int len) {\n if (len == 0) return 0;\n if (arr[len] != 0) return arr[len];\n if (len < a[0]) return Integer.MIN_VALUE;\n return (arr[len] =\n Math.max(\n len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n Math.max(\n len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n }\n\n public static class knightsComparator implements Comparator {\n\n @Override\n public int compare(knights arg0, knights arg1) {\n if (arg0.str < arg1.str) return -1;\n else if (arg0.str > arg1.str) return 1;\n else {\n if (arg0.coins < arg1.coins) return -1;\n else if (arg0.coins > arg1.coins) return 1;\n else return 0;\n }\n }\n }\n\n public static class duel {\n public int x;\n public int freq;\n\n public duel(int x, int y) {\n this.x = x;\n this.freq = y;\n }\n }\n\n public static int bracketSequenceConcat(String a, String b) {\n int ans = 0;\n boolean aflag = true, bflag = true;\n Stack st = new Stack();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n aflag = false;\n } else {\n st.pop();\n }\n }\n if (!st.isEmpty()) aflag = false;\n System.out.println(aflag);\n if (!aflag) b = a + b;\n System.out.println(\"b :\" + b);\n for (int i = 0; i < b.length(); i++) {\n if (b.charAt(i) == '(') st.push('(');\n else if (st.isEmpty()) {\n bflag = false;\n break;\n } else {\n st.pop();\n }\n System.out.println(st.size());\n }\n if (!st.isEmpty()) bflag = false;\n System.out.println(bflag);\n if (aflag && bflag) return 1;\n else if (!aflag && bflag) return 1;\n return ans;\n }\n\n public static int cuttingRod(int[] a, int n) {\n if (n <= 0) return 0;\n int ans = Integer.MIN_VALUE;\n for (int i = 0; i < n; i++) {\n ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n }\n return ans;\n }\n\n public static boolean isPrimeSqrt(int n) {\n if (n <= 1) return false;\n else if (n == 2 || n == 3) return true;\n for (int i = 2; i <= Math.sqrt(n); i++) {\n if (n % i == 0) return false;\n }\n return true;\n }\n\n public static int lcm(int a, int b) {\n return (a * b) / gcd(a, b);\n }\n\n public static int gcd(int a, int b) {\n if (a == 0) return b;\n if (b == 0) return a;\n if (a % b == 0) return b;\n else return gcd(b, a % b);\n }\n\n public static boolean isPowerOfTwo(long a) {\n long diff = a;\n long test = 1;\n while (test > 0) {\n if (diff == (diff & test)) {\n return true;\n }\n test = test << 1;\n }\n return false;\n }\n\n public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n if (l < r) {\n int mid = l + (r - l) / 2;\n if (target == a[mid]) return true;\n else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n else return boolBinarySearch(a, l, mid - 1, target);\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n- static class node {\n- int x;\n- int y;\n- }\n-\n- static node a[] = new node[5];\n- static node b[] = new node[5];\n- static int vis[][] = new int[300][300];\n-\n- static class cmp implements Comparator {\n- public int compare(node a, node b) {\n- if (a.x - b.x == 0) return a.y - b.y;\n- else return a.x - b.x;\n- }\n- }\n-\n- public static void main(String args[]) {\n- Scanner input = new Scanner(System.in);\n-\n- for (int i = 0; i < 4; i++) a[i] = new node();\n+public class Test {\n+\n+ private static Scanner s;\n+ public static int[] arr;\n+ public static int[] a = new int[3];\n+\n+ public static void main(String[] args) {\n+ s = new Scanner(System.in);\n+ int[] x_a = new int[4];\n+ int[] y_a = new int[4];\n+ int[] x = new int[2];\n+ x[0] = Integer.MAX_VALUE;\n+ x[1] = Integer.MIN_VALUE;\n+ int[] y = new int[2];\n+ y[0] = Integer.MAX_VALUE;\n+ y[1] = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n- a[i].x = input.nextInt();\n- a[i].y = input.nextInt();\n- }\n- for (int i = 0; i < 4; i++) b[i] = new node();\n+ x_a[i] = s.nextInt();\n+ y_a[i] = s.nextInt();\n+ x[0] = x_a[i] < x[0] ? x_a[i] : x[0];\n+ x[1] = x_a[i] > x[1] ? x_a[i] : x[1];\n+ y[0] = y_a[i] < y[0] ? y_a[i] : y[0];\n+ y[1] = y_a[i] > y[1] ? y_a[i] : y[1];\n+ }\n+ int[] x_b = new int[4];\n+ int[] y_b = new int[4];\n for (int i = 0; i < 4; i++) {\n- b[i].x = input.nextInt();\n- b[i].y = input.nextInt();\n- }\n-\n- Arrays.sort(a, 0, 4, new cmp());\n- Arrays.sort(b, 0, 4, new cmp());\n- for (int i = a[0].x; i <= a[2].x; i++) {\n- for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n- }\n- int cnt = 0, blag = 0;\n- for (int i = b[0].x; i < b[1].x; i++, cnt++)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n- for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n- if (blag == 0) System.out.println(\"NO\");\n- else System.out.println(\"YES\");\n+ x_b[i] = s.nextInt();\n+ y_b[i] = s.nextInt();\n+ }\n+ boolean ans = false;\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = x_b[i];\n+ int tmpY = y_b[i];\n+ if (tmpX > x[1] || tmpX < x[0] || tmpY > y[1] || tmpY < y[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) {\n+ System.out.println(\"Yes\");\n+ } else {\n+ int[] tmpx = new int[4];\n+ int[] tmpy = new int[4];\n+ int[] tmpx_b = new int[4];\n+ int[] tmpy_b = new int[4];\n+ int[] x1 = new int[2];\n+ x1[0] = Integer.MAX_VALUE;\n+ x1[1] = Integer.MIN_VALUE;\n+ int[] y1 = new int[2];\n+ y1[0] = Integer.MAX_VALUE;\n+ y1[1] = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ tmpx[i] = x_a[i] + y_a[i];\n+ tmpy[i] = x_a[i] - y_a[i];\n+ tmpx_b[i] = x_b[i] + y_b[i];\n+ tmpy_b[i] = x_b[i] - y_b[i];\n+\n+ x1[0] = tmpx_b[i] < x1[0] ? tmpx_b[i] : x1[0];\n+ x1[1] = tmpx_b[i] > x1[1] ? tmpx_b[i] : x1[1];\n+ y1[0] = tmpy_b[i] < y1[0] ? tmpy_b[i] : y1[0];\n+ y1[1] = tmpy_b[i] > y1[1] ? tmpy_b[i] : y1[1];\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ int tmpX = tmpx[i];\n+ int tmpY = tmpy[i];\n+ if (tmpX > x1[1] || tmpX < x1[0] || tmpY > y1[1] || tmpY < y1[0]) continue;\n+ else {\n+ ans = true;\n+ break;\n+ }\n+ }\n+ if (ans) System.out.println(\"Yes\");\n+ else {\n+ int midx = (x_b[0] + x_b[2]) / 2;\n+ int midy = (y_b[0] + y_b[2]) / 2;\n+ if (midx > x[1] || midx < x[0] || midy > y[1] || midy < y[0]) {\n+ System.out.println(\"No\");\n+ } else {\n+ ans = true;\n+ System.out.println(\"Yes\");\n+ }\n+ }\n+ }\n+ }\n+\n+ public static class knights {\n+ public int str;\n+ public long coins;\n+ public long maxCoins;\n+\n+ public knights(int strength) {\n+ this.str = strength;\n+ this.coins = 0;\n+ this.maxCoins = 0;\n+ }\n+\n+ public void setCoins(long money) {\n+ this.coins = money;\n+ }\n+ }\n+\n+ public static int maxribbons(int len) {\n+ if (len == 0) return 0;\n+ if (arr[len] != 0) return arr[len];\n+ if (len < a[0]) return Integer.MIN_VALUE;\n+ return (arr[len] =\n+ Math.max(\n+ len - a[0] >= 0 ? maxribbons(len - a[0]) + 1 : 0,\n+ Math.max(\n+ len - a[1] >= 0 ? maxribbons(len - a[1]) + 1 : 0,\n+ len - a[2] >= 0 ? maxribbons(len - a[2]) + 1 : 0)));\n+ }\n+\n+ public static class knightsComparator implements Comparator {\n+\n+ @Override\n+ public int compare(knights arg0, knights arg1) {\n+ if (arg0.str < arg1.str) return -1;\n+ else if (arg0.str > arg1.str) return 1;\n+ else {\n+ if (arg0.coins < arg1.coins) return -1;\n+ else if (arg0.coins > arg1.coins) return 1;\n+ else return 0;\n+ }\n+ }\n+ }\n+\n+ public static class duel {\n+ public int x;\n+ public int freq;\n+\n+ public duel(int x, int y) {\n+ this.x = x;\n+ this.freq = y;\n+ }\n+ }\n+\n+ public static int bracketSequenceConcat(String a, String b) {\n+ int ans = 0;\n+ boolean aflag = true, bflag = true;\n+ Stack st = new Stack();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ aflag = false;\n+ } else {\n+ st.pop();\n+ }\n+ }\n+ if (!st.isEmpty()) aflag = false;\n+ System.out.println(aflag);\n+ if (!aflag) b = a + b;\n+ System.out.println(\"b :\" + b);\n+ for (int i = 0; i < b.length(); i++) {\n+ if (b.charAt(i) == '(') st.push('(');\n+ else if (st.isEmpty()) {\n+ bflag = false;\n+ break;\n+ } else {\n+ st.pop();\n+ }\n+ System.out.println(st.size());\n+ }\n+ if (!st.isEmpty()) bflag = false;\n+ System.out.println(bflag);\n+ if (aflag && bflag) return 1;\n+ else if (!aflag && bflag) return 1;\n+ return ans;\n+ }\n+\n+ public static int cuttingRod(int[] a, int n) {\n+ if (n <= 0) return 0;\n+ int ans = Integer.MIN_VALUE;\n+ for (int i = 0; i < n; i++) {\n+ ans = Math.max(cuttingRod(a, n - i - 1) + a[i], ans);\n+ }\n+ return ans;\n+ }\n+\n+ public static boolean isPrimeSqrt(int n) {\n+ if (n <= 1) return false;\n+ else if (n == 2 || n == 3) return true;\n+ for (int i = 2; i <= Math.sqrt(n); i++) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+\n+ public static int lcm(int a, int b) {\n+ return (a * b) / gcd(a, b);\n+ }\n+\n+ public static int gcd(int a, int b) {\n+ if (a == 0) return b;\n+ if (b == 0) return a;\n+ if (a % b == 0) return b;\n+ else return gcd(b, a % b);\n+ }\n+\n+ public static boolean isPowerOfTwo(long a) {\n+ long diff = a;\n+ long test = 1;\n+ while (test > 0) {\n+ if (diff == (diff & test)) {\n+ return true;\n+ }\n+ test = test << 1;\n+ }\n+ return false;\n+ }\n+\n+ public static boolean boolBinarySearch(long[] a, int l, int r, long target) {\n+ if (l < r) {\n+ int mid = l + (r - l) / 2;\n+ if (target == a[mid]) return true;\n+ else if (target > a[mid]) return boolBinarySearch(a, mid + 1, r, target);\n+ else return boolBinarySearch(a, l, mid - 1, target);\n+ }\n+ return false;\n }\n }", "output": "FASTER 0.0315", "pair_id": "java_4759_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.0221} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C994 {\n static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n }\n\n public static void main(String args[]) throws IOException {\n Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n PrintWriter pw = new PrintWriter(System.out);\n int x11 = sc.nextInt();\n int y11 = sc.nextInt();\n int x12 = sc.nextInt();\n int y12 = sc.nextInt();\n int x13 = sc.nextInt();\n int y13 = sc.nextInt();\n int x14 = sc.nextInt();\n int y14 = sc.nextInt();\n double x1c = (x11 + x12 + x13 + x14) / 4.0;\n double y1c = (y11 + y12 + y13 + y14) / 4.0;\n int x21 = sc.nextInt();\n int y21 = sc.nextInt();\n int x22 = sc.nextInt();\n int y22 = sc.nextInt();\n int x23 = sc.nextInt();\n int y23 = sc.nextInt();\n int x24 = sc.nextInt();\n int y24 = sc.nextInt();\n double x2c = (x21 + x22 + x23 + x24) / 4.0;\n double y2c = (y21 + y22 + y23 + y24) / 4.0;\n double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n if (a1\n == area(x11, y11, x12, y12, x21, y21)\n + area(x11, y11, x21, y21, x14, y14)\n + area(x21, y21, x12, y12, x13, y13)\n + area(x21, y21, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x22, y22)\n + area(x11, y11, x22, y22, x14, y14)\n + area(x22, y22, x12, y12, x13, y13)\n + area(x22, y22, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x23, y23)\n + area(x11, y11, x23, y23, x14, y14)\n + area(x23, y23, x12, y12, x13, y13)\n + area(x23, y23, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x24, y24)\n + area(x11, y11, x24, y24, x14, y14)\n + area(x24, y24, x12, y12, x13, y13)\n + area(x24, y24, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a1\n == area(x11, y11, x12, y12, x2c, y2c)\n + area(x11, y11, x2c, y2c, x14, y14)\n + area(x2c, y2c, x12, y12, x13, y13)\n + area(x2c, y2c, x14, y14, x13, y13)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x11, y11)\n + area(x21, y21, x11, y11, x24, y24)\n + area(x11, y11, x22, y22, x23, y23)\n + area(x11, y11, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x12, y12)\n + area(x21, y21, x12, y12, x24, y24)\n + area(x12, y12, x22, y22, x23, y23)\n + area(x12, y12, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x13, y13)\n + area(x21, y21, x13, y13, x24, y24)\n + area(x13, y13, x22, y22, x23, y23)\n + area(x13, y13, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x14, y14)\n + area(x21, y21, x14, y14, x24, y24)\n + area(x14, y14, x22, y22, x23, y23)\n + area(x14, y14, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n if (a2\n == area(x21, y21, x22, y22, x1c, y1c)\n + area(x21, y21, x14, y14, x2c, y2c)\n + area(x1c, y1c, x22, y22, x23, y23)\n + area(x1c, y1c, x24, y24, x23, y23)) {\n pw.println(\"YES\");\n pw.close();\n return;\n }\n\n pw.println(\"NO\");\n pw.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n static class node {\n int x;\n int y;\n }\n\n static node a[] = new node[5];\n static node b[] = new node[5];\n static int vis[][] = new int[300][300];\n\n static class cmp implements Comparator {\n public int compare(node a, node b) {\n if (a.x - b.x == 0) return a.y - b.y;\n else return a.x - b.x;\n }\n }\n\n public static void main(String args[]) {\n Scanner input = new Scanner(System.in);\n\n for (int i = 0; i < 4; i++) a[i] = new node();\n for (int i = 0; i < 4; i++) {\n a[i].x = input.nextInt();\n a[i].y = input.nextInt();\n }\n for (int i = 0; i < 4; i++) b[i] = new node();\n for (int i = 0; i < 4; i++) {\n b[i].x = input.nextInt();\n b[i].y = input.nextInt();\n }\n\n Arrays.sort(a, 0, 4, new cmp());\n Arrays.sort(b, 0, 4, new cmp());\n for (int i = a[0].x; i <= a[2].x; i++) {\n for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n }\n int cnt = 0, blag = 0;\n for (int i = b[0].x; i < b[1].x; i++, cnt++)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n if (blag == 0) System.out.println(\"NO\");\n else System.out.println(\"YES\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class C994 {\n- static double area(double x1, double y1, double x2, double y2, double x3, double y3) {\n- return Math.abs((x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0);\n+public class Main {\n+ static class node {\n+ int x;\n+ int y;\n }\n \n- public static void main(String args[]) throws IOException {\n- Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));\n- PrintWriter pw = new PrintWriter(System.out);\n- int x11 = sc.nextInt();\n- int y11 = sc.nextInt();\n- int x12 = sc.nextInt();\n- int y12 = sc.nextInt();\n- int x13 = sc.nextInt();\n- int y13 = sc.nextInt();\n- int x14 = sc.nextInt();\n- int y14 = sc.nextInt();\n- double x1c = (x11 + x12 + x13 + x14) / 4.0;\n- double y1c = (y11 + y12 + y13 + y14) / 4.0;\n- int x21 = sc.nextInt();\n- int y21 = sc.nextInt();\n- int x22 = sc.nextInt();\n- int y22 = sc.nextInt();\n- int x23 = sc.nextInt();\n- int y23 = sc.nextInt();\n- int x24 = sc.nextInt();\n- int y24 = sc.nextInt();\n- double x2c = (x21 + x22 + x23 + x24) / 4.0;\n- double y2c = (y21 + y22 + y23 + y24) / 4.0;\n- double a1 = area(x11, y11, x12, y12, x13, y13) + area(x11, y11, x13, y13, x14, y14);\n- double a2 = area(x21, y21, x22, y22, x23, y23) + area(x21, y21, x23, y23, x24, y24);\n- if (a1\n- == area(x11, y11, x12, y12, x21, y21)\n- + area(x11, y11, x21, y21, x14, y14)\n- + area(x21, y21, x12, y12, x13, y13)\n- + area(x21, y21, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ static node a[] = new node[5];\n+ static node b[] = new node[5];\n+ static int vis[][] = new int[300][300];\n+\n+ static class cmp implements Comparator {\n+ public int compare(node a, node b) {\n+ if (a.x - b.x == 0) return a.y - b.y;\n+ else return a.x - b.x;\n }\n- if (a1\n- == area(x11, y11, x12, y12, x22, y22)\n- + area(x11, y11, x22, y22, x14, y14)\n- + area(x22, y22, x12, y12, x13, y13)\n- + area(x22, y22, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ }\n+\n+ public static void main(String args[]) {\n+ Scanner input = new Scanner(System.in);\n+\n+ for (int i = 0; i < 4; i++) a[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ a[i].x = input.nextInt();\n+ a[i].y = input.nextInt();\n }\n- if (a1\n- == area(x11, y11, x12, y12, x23, y23)\n- + area(x11, y11, x23, y23, x14, y14)\n- + area(x23, y23, x12, y12, x13, y13)\n- + area(x23, y23, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x24, y24)\n- + area(x11, y11, x24, y24, x14, y14)\n- + area(x24, y24, x12, y12, x13, y13)\n- + area(x24, y24, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a1\n- == area(x11, y11, x12, y12, x2c, y2c)\n- + area(x11, y11, x2c, y2c, x14, y14)\n- + area(x2c, y2c, x12, y12, x13, y13)\n- + area(x2c, y2c, x14, y14, x13, y13)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x11, y11)\n- + area(x21, y21, x11, y11, x24, y24)\n- + area(x11, y11, x22, y22, x23, y23)\n- + area(x11, y11, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x12, y12)\n- + area(x21, y21, x12, y12, x24, y24)\n- + area(x12, y12, x22, y22, x23, y23)\n- + area(x12, y12, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x13, y13)\n- + area(x21, y21, x13, y13, x24, y24)\n- + area(x13, y13, x22, y22, x23, y23)\n- + area(x13, y13, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x14, y14)\n- + area(x21, y21, x14, y14, x24, y24)\n- + area(x14, y14, x22, y22, x23, y23)\n- + area(x14, y14, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n- }\n- if (a2\n- == area(x21, y21, x22, y22, x1c, y1c)\n- + area(x21, y21, x14, y14, x2c, y2c)\n- + area(x1c, y1c, x22, y22, x23, y23)\n- + area(x1c, y1c, x24, y24, x23, y23)) {\n- pw.println(\"YES\");\n- pw.close();\n- return;\n+ for (int i = 0; i < 4; i++) b[i] = new node();\n+ for (int i = 0; i < 4; i++) {\n+ b[i].x = input.nextInt();\n+ b[i].y = input.nextInt();\n }\n \n- pw.println(\"NO\");\n- pw.close();\n+ Arrays.sort(a, 0, 4, new cmp());\n+ Arrays.sort(b, 0, 4, new cmp());\n+ for (int i = a[0].x; i <= a[2].x; i++) {\n+ for (int j = a[0].y; j <= a[1].y; j++) vis[i + 100][j + 100] = 1;\n+ }\n+ int cnt = 0, blag = 0;\n+ for (int i = b[0].x; i < b[1].x; i++, cnt++)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ for (int i = b[1].x; i <= b[3].x; i++, cnt--)\n+ for (int j = b[0].y - cnt; j <= b[0].y + cnt; j++) if (vis[i + 100][j + 100] == 1) blag = 1;\n+ if (blag == 0) System.out.println(\"NO\");\n+ else System.out.println(\"YES\");\n }\n }", "output": "SLOWER 0.0098", "pair_id": "java_4762_reversed", "problem_id": "994_C", "language": "java", "direction": "reversed", "speedup_ratio": 1.0068} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner in = new Scanner(System.in);\n static PrintWriter out = new PrintWriter(System.out);\n\n public static void main(String[] args) {\n int n = in.nextInt();\n\n int weight = 0;\n for (int i = 1; i < n - 1; i++) {\n weight += ((i + 1) * (i + 2));\n }\n\n out.println(weight);\n\n in.close();\n out.close();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.PrintWriter;\n+import java.util.Scanner;\n \n-public class triangulation {\n+public class Main {\n+ static Scanner in = new Scanner(System.in);\n+ static PrintWriter out = new PrintWriter(System.out);\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n+ int n = in.nextInt();\n+\n+ int weight = 0;\n+ for (int i = 1; i < n - 1; i++) {\n+ weight += ((i + 1) * (i + 2));\n }\n- out.println(sum);\n+\n+ out.println(weight);\n+\n+ in.close();\n out.close();\n }\n }", "output": "SLOWER 0.0068", "pair_id": "java_215_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0047} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class MyClass {\n+public class ProblemD {\n+\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- long n = in.nextInt();\n- long ans = 0;\n- for (int i = 2; i <= n - 1; i++) {\n- ans += i * (i + 1);\n- }\n- System.out.println(ans);\n+\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0363", "pair_id": "java_196_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0255} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class triangulation {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int t = sc.nextInt();\n int sum = 0;\n for (int i = 1; i <= t - 2; i++) {\n sum += (i + 1) * (i + 2);\n }\n out.println(sum);\n out.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ProblemD {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int vertices = scanner.nextInt(), total = 0;\n for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n System.out.println(total);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class triangulation {\n+public class ProblemD {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int t = sc.nextInt();\n- int sum = 0;\n- for (int i = 1; i <= t - 2; i++) {\n- sum += (i + 1) * (i + 2);\n- }\n- out.println(sum);\n- out.close();\n+\n+ Scanner scanner = new Scanner(System.in);\n+ int vertices = scanner.nextInt(), total = 0;\n+ for (int i = 3; i <= vertices; i++) total += i * (i - 1);\n+ System.out.println(total);\n }\n }", "output": "FASTER 0.0349", "pair_id": "java_195_forward", "problem_id": "1140_D", "language": "java", "direction": "forward", "speedup_ratio": 1.0245} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class B {\n\n private static long N;\n private static long LAST;\n\n public static void main(String[] args) {\n int[][] data;\n try (Scanner scanner = new Scanner(System.in)) {\n N = scanner.nextInt();\n int q = scanner.nextInt();\n\n LAST = N * N / 2 + (N & 1);\n\n data = new int[q][2];\n for (int step = 0; step < q; step++) {\n data[step][0] = scanner.nextInt();\n data[step][1] = scanner.nextInt();\n }\n\n for (int[] element : data) {\n System.out.println(number(element[0], element[1]));\n }\n }\n }\n\n private static long number(long i, long j) {\n\n long result = (i - 1) * N / 2 + j / 2;\n long jParity = j & 1;\n long tail = jParity + LAST * (jParity ^ (i & 1));\n\n return result + (tail | ((N & 1) & (1 - jParity)));\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class second {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n long n = sc.nextLong();\n int q = sc.nextInt();\n long last = (n * n + 1) / 2;\n for (int rep = 0; rep < q; rep++) {\n int x = sc.nextInt();\n int y = sc.nextInt();\n x--;\n y--;\n long answer = 1 + (x * n + y) / 2;\n if ((x + y) % 2 != 0) answer += last;\n pw.println(answer);\n }\n pw.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n-public class B {\n-\n- private static long N;\n- private static long LAST;\n-\n+public class second {\n public static void main(String[] args) {\n- int[][] data;\n- try (Scanner scanner = new Scanner(System.in)) {\n- N = scanner.nextInt();\n- int q = scanner.nextInt();\n-\n- LAST = N * N / 2 + (N & 1);\n-\n- data = new int[q][2];\n- for (int step = 0; step < q; step++) {\n- data[step][0] = scanner.nextInt();\n- data[step][1] = scanner.nextInt();\n- }\n-\n- for (int[] element : data) {\n- System.out.println(number(element[0], element[1]));\n- }\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ long n = sc.nextLong();\n+ int q = sc.nextInt();\n+ long last = (n * n + 1) / 2;\n+ for (int rep = 0; rep < q; rep++) {\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+ x--;\n+ y--;\n+ long answer = 1 + (x * n + y) / 2;\n+ if ((x + y) % 2 != 0) answer += last;\n+ pw.println(answer);\n }\n- }\n-\n- private static long number(long i, long j) {\n-\n- long result = (i - 1) * N / 2 + j / 2;\n- long jParity = j & 1;\n- long tail = jParity + LAST * (jParity ^ (i & 1));\n-\n- return result + (tail | ((N & 1) & (1 - jParity)));\n+ pw.flush();\n }\n }", "output": "FASTER 0.3312", "pair_id": "java_5827_forward", "problem_id": "1027_B", "language": "java", "direction": "forward", "speedup_ratio": 1.2581} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = Integer.parseInt(sc.next());\n String S = sc.next();\n StringBuilder sb = new StringBuilder(S);\n int ans = 0;\n for (int i = 0; i < S.length(); i++) {\n String S_tmp = sb.substring(i);\n int[] z = z_algo(S_tmp);\n\n for (int j = 1; j < S.length() - i; j++) {\n if (j >= z[j]) {\n ans = Math.max(ans, z[j]);\n }\n }\n }\n System.out.println(ans);\n }\n\n public static int[] z_algo(String S) {\n int N = S.length();\n int[] A = new int[N];\n A[0] = N;\n int i = 1;\n int j = 0;\n while (i < N) {\n while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n j++;\n }\n A[i] = j;\n if (j == 0) {\n i++;\n continue;\n }\n int k = 1;\n while (i + k < N && k + A[k] < j) {\n A[i + k] = A[k];\n k++;\n }\n i += k;\n j -= k;\n }\n return A;\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.HashMap;\nimport java.util.Random;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int N = scanner.nextInt();\n char[] s = scanner.next().toCharArray();\n int[] M = {999_999_937, 1_000_000_007};\n int B = new Random().nextInt(999_999_937);\n int left = 0;\n int right = N / 2 + 1;\n while (right - left > 1) {\n int mid = (left + right) / 2;\n if (possible(s, mid, N, B, M)) left = mid;\n else right = mid;\n }\n System.out.println(left);\n }\n\n private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n long[] bn = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n bn[i] = 1;\n for (int j = 0; j < K - 1; j++) {\n bn[i] *= B;\n bn[i] %= M[i];\n }\n }\n\n HashMap occurrences = new HashMap<>();\n long[] hash = new long[M.length];\n for (int i = 0; i < M.length; i++) {\n hash[i] = hash(s, K, B, M[i]);\n }\n occurrences.put(new Tuple(hash), 0);\n for (int i = 1; i <= N - K; i++) {\n for (int j = 0; j < M.length; j++) {\n hash[j] -= s[i - 1] * bn[j] % M[j];\n if (hash[j] < 0) hash[j] += M[j];\n hash[j] *= B;\n hash[j] %= M[j];\n hash[j] += s[i + K - 1];\n if (hash[j] >= M[j]) hash[j] -= M[j];\n }\n Tuple key = new Tuple(hash);\n if (occurrences.containsKey(key)) {\n if (occurrences.get(key) + K <= i) return true;\n } else occurrences.put(key, i);\n }\n return false;\n }\n\n private static long hash(char[] s, int len, int B, int M) {\n if (s.length < len)\n throw new IllegalArgumentException(\n \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n long hash = 0;\n for (int i = 0; i < len; i++) {\n hash *= B;\n hash %= M;\n hash += s[i];\n if (hash >= M) hash -= M;\n }\n return hash;\n }\n\n private static class Tuple {\n private final long[] elements;\n\n private Tuple(long[] elements) {\n this.elements = Arrays.copyOf(elements, elements.length);\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Tuple tuple = (Tuple) o;\n return Arrays.equals(elements, tuple.elements);\n }\n\n @Override\n public int hashCode() {\n return Arrays.hashCode(elements);\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.HashMap;\n+import java.util.Random;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = Integer.parseInt(sc.next());\n- String S = sc.next();\n- StringBuilder sb = new StringBuilder(S);\n- int ans = 0;\n- for (int i = 0; i < S.length(); i++) {\n- String S_tmp = sb.substring(i);\n- int[] z = z_algo(S_tmp);\n+ Scanner scanner = new Scanner(System.in);\n \n- for (int j = 1; j < S.length() - i; j++) {\n- if (j >= z[j]) {\n- ans = Math.max(ans, z[j]);\n- }\n+ int N = scanner.nextInt();\n+ char[] s = scanner.next().toCharArray();\n+ int[] M = {999_999_937, 1_000_000_007};\n+ int B = new Random().nextInt(999_999_937);\n+ int left = 0;\n+ int right = N / 2 + 1;\n+ while (right - left > 1) {\n+ int mid = (left + right) / 2;\n+ if (possible(s, mid, N, B, M)) left = mid;\n+ else right = mid;\n+ }\n+ System.out.println(left);\n+ }\n+\n+ private static boolean possible(char[] s, int K, int N, int B, int[] M) {\n+ long[] bn = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ bn[i] = 1;\n+ for (int j = 0; j < K - 1; j++) {\n+ bn[i] *= B;\n+ bn[i] %= M[i];\n }\n }\n- System.out.println(ans);\n+\n+ HashMap occurrences = new HashMap<>();\n+ long[] hash = new long[M.length];\n+ for (int i = 0; i < M.length; i++) {\n+ hash[i] = hash(s, K, B, M[i]);\n+ }\n+ occurrences.put(new Tuple(hash), 0);\n+ for (int i = 1; i <= N - K; i++) {\n+ for (int j = 0; j < M.length; j++) {\n+ hash[j] -= s[i - 1] * bn[j] % M[j];\n+ if (hash[j] < 0) hash[j] += M[j];\n+ hash[j] *= B;\n+ hash[j] %= M[j];\n+ hash[j] += s[i + K - 1];\n+ if (hash[j] >= M[j]) hash[j] -= M[j];\n+ }\n+ Tuple key = new Tuple(hash);\n+ if (occurrences.containsKey(key)) {\n+ if (occurrences.get(key) + K <= i) return true;\n+ } else occurrences.put(key, i);\n+ }\n+ return false;\n }\n \n- public static int[] z_algo(String S) {\n- int N = S.length();\n- int[] A = new int[N];\n- A[0] = N;\n- int i = 1;\n- int j = 0;\n- while (i < N) {\n- while (i + j < N && S.charAt(j) == S.charAt(i + j)) {\n- j++;\n- }\n- A[i] = j;\n- if (j == 0) {\n- i++;\n- continue;\n- }\n- int k = 1;\n- while (i + k < N && k + A[k] < j) {\n- A[i + k] = A[k];\n- k++;\n- }\n- i += k;\n- j -= k;\n+ private static long hash(char[] s, int len, int B, int M) {\n+ if (s.length < len)\n+ throw new IllegalArgumentException(\n+ \"len must be equal to or more than s.length: len=\" + len + \", s.length=\" + s.length);\n+ long hash = 0;\n+ for (int i = 0; i < len; i++) {\n+ hash *= B;\n+ hash %= M;\n+ hash += s[i];\n+ if (hash >= M) hash -= M;\n }\n- return A;\n+ return hash;\n+ }\n+\n+ private static class Tuple {\n+ private final long[] elements;\n+\n+ private Tuple(long[] elements) {\n+ this.elements = Arrays.copyOf(elements, elements.length);\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+ Tuple tuple = (Tuple) o;\n+ return Arrays.equals(elements, tuple.elements);\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ return Arrays.hashCode(elements);\n+ }\n }\n }", "output": "FASTER 0.2965", "pair_id": "java_3835_forward", "problem_id": "p02913", "language": "java", "direction": "forward", "speedup_ratio": 1.2282} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class MyClass {\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n long n = in.nextInt();\n long ans = 0;\n for (int i = 2; i <= n - 1; i++) {\n ans += i * (i + 1);\n }\n System.out.println(ans);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class a1140 {\n- public static void main(String args[]) {\n+public class MyClass {\n+ public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+ long n = in.nextInt();\n+ long ans = 0;\n+ for (int i = 2; i <= n - 1; i++) {\n+ ans += i * (i + 1);\n }\n- System.out.println(p);\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.0276", "pair_id": "java_202_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0193} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class ArrayA_300A {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int arr[] = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = sc.nextInt();\n }\n Arrays.sort(arr);\n System.out.println(1 + \" \" + arr[0]);\n if (arr[n - 1] > 0) {\n System.out.println(1 + \" \" + arr[n - 1]);\n System.out.print(n - 2 + \" \");\n for (int i = 1; i < n - 1; i++) {\n System.out.print(arr[i] + \" \");\n }\n System.out.println();\n } else {\n System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n System.out.print(n - 3 + \" \");\n for (int i = 3; i < n; i++) {\n System.out.print(arr[i] + \" \");\n }\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class CF300A {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n int[] neg = new int[1];\n int zeros = 0;\n int n = sc.nextInt();\n ArrayList all = new ArrayList<>();\n boolean found = false;\n int c = 0;\n int negN = -1;\n int oddN = 0;\n boolean odd = false;\n\n for (int i = 0; i < n; i++) {\n int chk = sc.nextInt();\n if (chk < 0) {\n oddN++;\n }\n if (chk == 0) zeros++;\n else all.add(chk);\n }\n\n if (oddN > 0 && oddN % 2 == 0) {\n odd = true;\n for (int i = 0; i < all.size(); i++) {\n if (all.get(i) < 0) {\n negN = all.get(i);\n all.remove(i);\n break;\n }\n }\n }\n\n int[] num = new int[n];\n\n for (int i = 0; i < all.size(); i++) {\n int x = all.get(i);\n if (x < 0 && !found) {\n neg[0] = x;\n found = true;\n } else if (x > 0 || (x < 0 && found)) {\n num[c] = x;\n c++;\n }\n }\n pr.println(\"1 \" + neg[0]);\n pr.print(c);\n for (int i = 0; i < c; i++) {\n pr.print(\" \" + num[i]);\n }\n pr.println();\n\n if (odd) pr.print(zeros + 1 + \" \" + negN);\n else pr.print(zeros);\n\n for (int i = 0; i < zeros; i++) {\n pr.print(\" 0\");\n }\n pr.flush();\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class ArrayA_300A {\n+public class CF300A {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));\n+ int[] neg = new int[1];\n+ int zeros = 0;\n+ int n = sc.nextInt();\n+ ArrayList all = new ArrayList<>();\n+ boolean found = false;\n+ int c = 0;\n+ int negN = -1;\n+ int oddN = 0;\n+ boolean odd = false;\n \n- public static void main(String[] args) {\n+ for (int i = 0; i < n; i++) {\n+ int chk = sc.nextInt();\n+ if (chk < 0) {\n+ oddN++;\n+ }\n+ if (chk == 0) zeros++;\n+ else all.add(chk);\n+ }\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int arr[] = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = sc.nextInt();\n- }\n- Arrays.sort(arr);\n- System.out.println(1 + \" \" + arr[0]);\n- if (arr[n - 1] > 0) {\n- System.out.println(1 + \" \" + arr[n - 1]);\n- System.out.print(n - 2 + \" \");\n- for (int i = 1; i < n - 1; i++) {\n- System.out.print(arr[i] + \" \");\n- }\n- System.out.println();\n- } else {\n- System.out.println(2 + \" \" + arr[1] + \" \" + arr[2]);\n- System.out.print(n - 3 + \" \");\n- for (int i = 3; i < n; i++) {\n- System.out.print(arr[i] + \" \");\n+ if (oddN > 0 && oddN % 2 == 0) {\n+ odd = true;\n+ for (int i = 0; i < all.size(); i++) {\n+ if (all.get(i) < 0) {\n+ negN = all.get(i);\n+ all.remove(i);\n+ break;\n+ }\n }\n }\n+\n+ int[] num = new int[n];\n+\n+ for (int i = 0; i < all.size(); i++) {\n+ int x = all.get(i);\n+ if (x < 0 && !found) {\n+ neg[0] = x;\n+ found = true;\n+ } else if (x > 0 || (x < 0 && found)) {\n+ num[c] = x;\n+ c++;\n+ }\n+ }\n+ pr.println(\"1 \" + neg[0]);\n+ pr.print(c);\n+ for (int i = 0; i < c; i++) {\n+ pr.print(\" \" + num[i]);\n+ }\n+ pr.println();\n+\n+ if (odd) pr.print(zeros + 1 + \" \" + negN);\n+ else pr.print(zeros);\n+\n+ for (int i = 0; i < zeros; i++) {\n+ pr.print(\" 0\");\n+ }\n+ pr.flush();\n }\n }", "output": "FASTER 0.1276", "pair_id": "java_6822_forward", "problem_id": "300_A", "language": "java", "direction": "forward", "speedup_ratio": 1.0925} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.util.*;\n\npublic class C {\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n this.x = x;\n this.y = y;\n }\n\n public int getX() {\n return x;\n }\n\n public int getY() {\n return y;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n Point point = (Point) o;\n return x == point.x && y == point.y;\n }\n\n @Override\n public int hashCode() {\n\n return Objects.hash(x, y);\n }\n\n @Override\n public String toString() {\n return x + \",\" + y;\n }\n }\n\n static class Square {\n List points = new ArrayList<>();\n }\n\n public static void main(String[] args) {\n FastScanner scanner = new FastScanner();\n\n Square A = readSquare(scanner);\n Square B = readSquare(scanner);\n\n Set regions = new HashSet<>();\n Point center = center(B);\n draw(regions, B.points.get(0), B.points.get(1), center);\n draw(regions, B.points.get(1), B.points.get(2), center);\n draw(regions, B.points.get(2), B.points.get(3), center);\n draw(regions, B.points.get(3), B.points.get(0), center);\n\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n\n for (int x = minx; x <= maxx; ++x) {\n for (int y = miny; y <= maxy; ++y) {\n if (regions.contains(new Point(x, y))) {\n System.out.println(\"YES\");\n return;\n }\n }\n }\n\n System.out.println(\"NO\");\n }\n\n private static Point center(Square A) {\n int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n int midx = 0;\n int midy = 0;\n for (Point p : A.points) {\n if (p.x != minx && p.x != maxx) {\n midx = p.x;\n break;\n }\n }\n for (Point p : A.points) {\n if (p.y != miny && p.y != maxy) {\n midy = p.y;\n break;\n }\n }\n return new Point(midx, midy);\n }\n\n static void draw(Set regions, Point a, Point b, Point c) {\n List xs = new ArrayList<>();\n List ys = new ArrayList<>();\n if (a.x < b.x) {\n for (int x = a.x; x <= b.x; ++x) {\n xs.add(x);\n }\n } else {\n for (int x = a.x; x >= b.x; --x) {\n xs.add(x);\n }\n }\n if (a.y < b.y) {\n for (int y = a.y; y <= b.y; ++y) {\n ys.add(y);\n }\n } else {\n for (int y = a.y; y >= b.y; --y) {\n ys.add(y);\n }\n }\n\n for (int i = 0; i < xs.size(); ++i) {\n regions.add(new Point(xs.get(i), ys.get(i)));\n for (int xx = xs.get(i); xx <= c.x; ++xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n for (int xx = xs.get(i); xx >= c.x; --xx) {\n regions.add(new Point(xx, ys.get(i)));\n }\n }\n }\n\n private static Square readSquare(FastScanner scanner) {\n Square A = new Square();\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n return A;\n }\n\n public static class FastScanner {\n BufferedReader br;\n StringTokenizer st;\n\n public FastScanner() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n static long mod = 1000000007;\n\n public static void main(String[] args) throws Exception {\n FastReader in = new FastReader();\n PrintWriter pw = new PrintWriter(System.out);\n int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n int[][] c = new int[8][2];\n for (int i = 0; i < 8; i++) {\n int x = in.nextInt();\n int y = in.nextInt();\n if (i > 3) {\n c[i][0] = x + y;\n c[i][1] = y - x;\n } else {\n c[i][0] = x;\n c[i][1] = y;\n }\n }\n for (int i = 0; i < 4; i++) {\n axmin = Math.min(axmin, c[i][0]);\n axmax = Math.max(axmax, c[i][0]);\n aymin = Math.min(aymin, c[i][1]);\n aymax = Math.max(aymax, c[i][1]);\n }\n for (int i = 4; i < 8; i++) {\n bxmin = Math.min(bxmin, c[i][0]);\n bxmax = Math.max(bxmax, c[i][0]);\n bymin = Math.min(bymin, c[i][1]);\n bymax = Math.max(bymax, c[i][1]);\n }\n String ans = \"NO\";\n for (int x = axmin; x <= axmax; x++) {\n for (int y = aymin; y <= aymax; y++) {\n if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n }\n }\n pw.print(ans);\n pw.flush();\n }\n\n public static long inverse(long a) {\n long r = 1, p = mod - 2;\n while (p > 0) {\n if (p % 2 == 1) {\n r *= a;\n r %= mod;\n }\n p >>= 1;\n a = (a * a) % mod;\n }\n\n return r;\n }\n}\n\nclass pair {\n A f;\n B s;\n\n public pair(A a, B b) {\n f = a;\n s = b;\n }\n}\n\nclass FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() throws IOException {\n if (st == null || !st.hasMoreElements()) {\n st = new StringTokenizer(br.readLine());\n }\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.*;\n import java.util.*;\n \n-public class C {\n- static class Point {\n- int x, y;\n+public class Main {\n+ static long mod = 1000000007;\n \n- public Point(int x, int y) {\n- this.x = x;\n- this.y = y;\n+ public static void main(String[] args) throws Exception {\n+ FastReader in = new FastReader();\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int axmax = -101, axmin = 101, aymax = -101, aymin = 101;\n+ int bxmax = -101, bxmin = 101, bymax = -101, bymin = 101;\n+ int[][] c = new int[8][2];\n+ for (int i = 0; i < 8; i++) {\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ if (i > 3) {\n+ c[i][0] = x + y;\n+ c[i][1] = y - x;\n+ } else {\n+ c[i][0] = x;\n+ c[i][1] = y;\n+ }\n+ }\n+ for (int i = 0; i < 4; i++) {\n+ axmin = Math.min(axmin, c[i][0]);\n+ axmax = Math.max(axmax, c[i][0]);\n+ aymin = Math.min(aymin, c[i][1]);\n+ aymax = Math.max(aymax, c[i][1]);\n+ }\n+ for (int i = 4; i < 8; i++) {\n+ bxmin = Math.min(bxmin, c[i][0]);\n+ bxmax = Math.max(bxmax, c[i][0]);\n+ bymin = Math.min(bymin, c[i][1]);\n+ bymax = Math.max(bymax, c[i][1]);\n+ }\n+ String ans = \"NO\";\n+ for (int x = axmin; x <= axmax; x++) {\n+ for (int y = aymin; y <= aymax; y++) {\n+ if (bxmin <= x + y && x + y <= bxmax && bymin <= y - x && y - x <= bymax) ans = \"YES\";\n+ }\n+ }\n+ pw.print(ans);\n+ pw.flush();\n+ }\n+\n+ public static long inverse(long a) {\n+ long r = 1, p = mod - 2;\n+ while (p > 0) {\n+ if (p % 2 == 1) {\n+ r *= a;\n+ r %= mod;\n+ }\n+ p >>= 1;\n+ a = (a * a) % mod;\n }\n \n- public int getX() {\n- return x;\n- }\n+ return r;\n+ }\n+}\n \n- public int getY() {\n- return y;\n- }\n+class pair {\n+ A f;\n+ B s;\n \n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n- Point point = (Point) o;\n- return x == point.x && y == point.y;\n- }\n+ public pair(A a, B b) {\n+ f = a;\n+ s = b;\n+ }\n+}\n \n- @Override\n- public int hashCode() {\n+class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- return Objects.hash(x, y);\n- }\n-\n- @Override\n- public String toString() {\n- return x + \",\" + y;\n- }\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n }\n \n- static class Square {\n- List points = new ArrayList<>();\n+ public String next() throws IOException {\n+ if (st == null || !st.hasMoreElements()) {\n+ st = new StringTokenizer(br.readLine());\n+ }\n+ return st.nextToken();\n }\n \n- public static void main(String[] args) {\n- FastScanner scanner = new FastScanner();\n-\n- Square A = readSquare(scanner);\n- Square B = readSquare(scanner);\n-\n- Set regions = new HashSet<>();\n- Point center = center(B);\n- draw(regions, B.points.get(0), B.points.get(1), center);\n- draw(regions, B.points.get(1), B.points.get(2), center);\n- draw(regions, B.points.get(2), B.points.get(3), center);\n- draw(regions, B.points.get(3), B.points.get(0), center);\n-\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n-\n- for (int x = minx; x <= maxx; ++x) {\n- for (int y = miny; y <= maxy; ++y) {\n- if (regions.contains(new Point(x, y))) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- }\n-\n- System.out.println(\"NO\");\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- private static Point center(Square A) {\n- int minx = A.points.stream().mapToInt(Point::getX).min().getAsInt();\n- int maxx = A.points.stream().mapToInt(Point::getX).max().getAsInt();\n- int miny = A.points.stream().mapToInt(Point::getY).min().getAsInt();\n- int maxy = A.points.stream().mapToInt(Point::getY).max().getAsInt();\n- int midx = 0;\n- int midy = 0;\n- for (Point p : A.points) {\n- if (p.x != minx && p.x != maxx) {\n- midx = p.x;\n- break;\n- }\n- }\n- for (Point p : A.points) {\n- if (p.y != miny && p.y != maxy) {\n- midy = p.y;\n- break;\n- }\n- }\n- return new Point(midx, midy);\n- }\n-\n- static void draw(Set regions, Point a, Point b, Point c) {\n- List xs = new ArrayList<>();\n- List ys = new ArrayList<>();\n- if (a.x < b.x) {\n- for (int x = a.x; x <= b.x; ++x) {\n- xs.add(x);\n- }\n- } else {\n- for (int x = a.x; x >= b.x; --x) {\n- xs.add(x);\n- }\n- }\n- if (a.y < b.y) {\n- for (int y = a.y; y <= b.y; ++y) {\n- ys.add(y);\n- }\n- } else {\n- for (int y = a.y; y >= b.y; --y) {\n- ys.add(y);\n- }\n- }\n-\n- for (int i = 0; i < xs.size(); ++i) {\n- regions.add(new Point(xs.get(i), ys.get(i)));\n- for (int xx = xs.get(i); xx <= c.x; ++xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- for (int xx = xs.get(i); xx >= c.x; --xx) {\n- regions.add(new Point(xx, ys.get(i)));\n- }\n- }\n- }\n-\n- private static Square readSquare(FastScanner scanner) {\n- Square A = new Square();\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- A.points.add(new Point(scanner.nextInt(), scanner.nextInt()));\n- return A;\n- }\n-\n- public static class FastScanner {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastScanner() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }", "output": "FASTER 4.0728", "pair_id": "java_4707_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 16.8279} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class QuestionC {\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n int[][] s1 = new int[4][2], s2 = new int[4][2];\n StringTokenizer st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s1[i][0] = Integer.parseInt(st.nextToken());\n s1[i][1] = Integer.parseInt(st.nextToken());\n }\n st = new StringTokenizer(in.readLine());\n for (int i = 0; i < 4; i++) {\n s2[i][0] = Integer.parseInt(st.nextToken());\n s2[i][1] = Integer.parseInt(st.nextToken());\n }\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (inter(\n s1[i][0],\n s1[i][1],\n s1[(i + 1) % 4][0],\n s1[(i + 1) % 4][1],\n s2[j][0],\n s2[j][1],\n s2[(j + 1) % 4][0],\n s2[(j + 1) % 4][1])) {\n out.println(\"YES\");\n out.close();\n return;\n }\n }\n }\n if (checkInside(s1, s2)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n int[][] s3 = new int[4][2], s4 = new int[4][2];\n for (int i = 0; i < 4; i++) {\n s3[i][0] = s1[i][0] - s1[i][1];\n s3[i][1] = s1[i][0] + s1[i][1];\n s4[i][0] = s2[i][0] - s2[i][1];\n s4[i][1] = s2[i][0] + s2[i][1];\n }\n if (checkInside(s4, s3)) {\n out.println(\"YES\");\n out.close();\n return;\n }\n out.println(\"NO\");\n in.close();\n out.close();\n }\n\n public static boolean checkInside(int[][] s1, int[][] s2) {\n int lx = Integer.MAX_VALUE,\n hx = Integer.MIN_VALUE,\n ly = Integer.MAX_VALUE,\n hy = Integer.MIN_VALUE;\n for (int i = 0; i < 4; i++) {\n lx = Math.min(lx, s1[i][0]);\n hx = Math.max(hx, s1[i][0]);\n ly = Math.min(ly, s1[i][1]);\n hy = Math.max(hy, s1[i][1]);\n }\n for (int i = 0; i < 4; i++) {\n if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n return false;\n }\n }\n return true;\n }\n\n public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n if (v == 0) return 0;\n return (v > 0) ? 1 : 2;\n }\n\n public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n return bx <= Math.max(ax, cx)\n && bx >= Math.min(ax, cx)\n && by <= Math.max(ay, cy)\n && by >= Math.min(ay, cy);\n }\n\n public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n int o1 = orie(ax, ay, bx, by, cx, cy),\n o2 = orie(ax, ay, bx, by, dx, dy),\n o3 = orie(cx, cy, dx, dy, ax, ay),\n o4 = orie(cx, cy, dx, dy, bx, by);\n if (o1 != o2 && o3 != o4) return true;\n if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n-public class C {\n- static class FastWriter {\n- private final BufferedWriter bw;\n-\n- public FastWriter() {\n- this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+public class QuestionC {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));\n+ int[][] s1 = new int[4][2], s2 = new int[4][2];\n+ StringTokenizer st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s1[i][0] = Integer.parseInt(st.nextToken());\n+ s1[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public void print(Object object) throws IOException {\n- bw.append(\"\" + object);\n+ st = new StringTokenizer(in.readLine());\n+ for (int i = 0; i < 4; i++) {\n+ s2[i][0] = Integer.parseInt(st.nextToken());\n+ s2[i][1] = Integer.parseInt(st.nextToken());\n }\n-\n- public void println(Object object) throws IOException {\n- print(object);\n- bw.append(\"\\n\");\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (inter(\n+ s1[i][0],\n+ s1[i][1],\n+ s1[(i + 1) % 4][0],\n+ s1[(i + 1) % 4][1],\n+ s2[j][0],\n+ s2[j][1],\n+ s2[(j + 1) % 4][0],\n+ s2[(j + 1) % 4][1])) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ }\n }\n-\n- public void close() throws IOException {\n- bw.close();\n+ if (checkInside(s1, s2)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n }\n+ int[][] s3 = new int[4][2], s4 = new int[4][2];\n+ for (int i = 0; i < 4; i++) {\n+ s3[i][0] = s1[i][0] - s1[i][1];\n+ s3[i][1] = s1[i][0] + s1[i][1];\n+ s4[i][0] = s2[i][0] - s2[i][1];\n+ s4[i][1] = s2[i][0] + s2[i][1];\n+ }\n+ if (checkInside(s4, s3)) {\n+ out.println(\"YES\");\n+ out.close();\n+ return;\n+ }\n+ out.println(\"NO\");\n+ in.close();\n+ out.close();\n }\n \n- static class FastReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public FastReader() {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public static boolean checkInside(int[][] s1, int[][] s2) {\n+ int lx = Integer.MAX_VALUE,\n+ hx = Integer.MIN_VALUE,\n+ ly = Integer.MAX_VALUE,\n+ hy = Integer.MIN_VALUE;\n+ for (int i = 0; i < 4; i++) {\n+ lx = Math.min(lx, s1[i][0]);\n+ hx = Math.max(hx, s1[i][0]);\n+ ly = Math.min(ly, s1[i][1]);\n+ hy = Math.max(hy, s1[i][1]);\n }\n-\n- String next() {\n- while (st == null || !st.hasMoreElements()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- String nextLine() {\n- String str = \"\";\n- try {\n- str = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return str;\n- }\n-\n- BigInteger nextBigInteger() {\n- try {\n- return new BigInteger(nextLine());\n- } catch (NumberFormatException e) {\n- throw new InputMismatchException();\n+ for (int i = 0; i < 4; i++) {\n+ if (s2[i][0] <= lx || s2[i][0] >= hx || s2[i][1] <= ly || s2[i][1] >= hy) {\n+ return false;\n }\n }\n+ return true;\n }\n \n- public static class point implements Comparable {\n- double x;\n- double y;\n-\n- point(double x, double y) {\n- this.x = x;\n- this.y = y;\n- }\n-\n- @Override\n- public int compareTo(point o) {\n- double a = this.x + this.y;\n- double b = o.x + o.y;\n- if (a == b) {\n- return (int) (this.y - o.y);\n- } else {\n- return (int) (a - b);\n- }\n- }\n+ public static int orie(int ax, int ay, int bx, int by, int cx, int cy) {\n+ int v = (by - ay) * (cx - bx) - (bx - ax) * (cy - by);\n+ if (v == 0) return 0;\n+ return (v > 0) ? 1 : 2;\n }\n \n- public static class line {\n- double x;\n- double y;\n-\n- line(point a, point b, double x) {\n- this.x = x;\n- this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n- }\n+ public static boolean on(int ax, int ay, int bx, int by, int cx, int cy) {\n+ return bx <= Math.max(ax, cx)\n+ && bx >= Math.min(ax, cx)\n+ && by <= Math.max(ay, cy)\n+ && by >= Math.min(ay, cy);\n }\n \n- public static void main(String[] args) {\n- FastReader fr = new FastReader();\n- FastWriter fw = new FastWriter();\n- point[] one = new point[4];\n- point[] two = new point[4];\n- for (int i = 0; i < 4; i++) {\n- one[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n-\n- for (int i = 0; i < 4; i++) {\n- two[i] = new point(fr.nextInt(), fr.nextInt());\n- }\n- Arrays.sort(one);\n- point temp = one[3];\n- one[3] = one[2];\n- one[2] = temp;\n-\n- point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n- point[] tarr = two;\n- two = new point[5];\n- for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n- two[4] = five;\n- for (int i = 0; i < 5; i++) {\n- double vala = one[0].y - two[i].y;\n- double valb = one[2].y - two[i].y;\n- double valc = one[2].x - two[i].x;\n- double vald = one[0].x - two[i].x;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- for (int i = 0; i < 4; i++) {\n- line a = new line(two[0], two[1], one[i].x);\n- line b = new line(two[2], two[3], one[i].x);\n-\n- line c = new line(two[1], two[2], one[i].x);\n- line d = new line(two[3], two[0], one[i].x);\n-\n- double vala = one[i].y - a.y;\n- double valb = one[i].y - b.y;\n- double valc = one[i].y - c.y;\n- double vald = one[i].y - d.y;\n-\n- if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n- && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n- System.out.println(\"YES\");\n- return;\n- }\n- }\n- System.out.println(\"NO\");\n+ public static boolean inter(int ax, int ay, int bx, int by, int cx, int cy, int dx, int dy) {\n+ int o1 = orie(ax, ay, bx, by, cx, cy),\n+ o2 = orie(ax, ay, bx, by, dx, dy),\n+ o3 = orie(cx, cy, dx, dy, ax, ay),\n+ o4 = orie(cx, cy, dx, dy, bx, by);\n+ if (o1 != o2 && o3 != o4) return true;\n+ if (o1 == 0 && on(ax, ay, cx, cy, bx, by)) return true;\n+ if (o2 == 0 && on(ax, ay, dx, dy, bx, by)) return true;\n+ if (o3 == 0 && on(cx, cy, ax, ay, dx, dy)) return true;\n+ if (o4 == 0 && on(cx, cy, bx, by, dx, dy)) return true;\n+ return false;\n }\n }", "output": "FASTER 0.698", "pair_id": "java_4691_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.6222} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n class pair {\n double x, y;\n\n pair(double a, double b) {\n x = a;\n y = b;\n }\n }\n\n pair a[][] = new pair[2][4];\n\n boolean chk(double x, double y) {\n if (a[0][0].x == a[0][1].x) {\n if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n return false;\n } else {\n if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n return false;\n }\n double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n\n if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n return false;\n return true;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n for (int i = 0; i < 2; i++) {\n for (int j = 0; j < 4; j++) {\n a[i][j] = new pair(in.nextInt(), in.nextInt());\n }\n }\n\n for (int i = -100; i <= 100; i++) {\n for (int j = -100; j <= 100; j++) {\n if (chk(i, j)) {\n out.print(\"YES\");\n return;\n }\n }\n }\n out.print(\"NO\");\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.geom.Area;\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class C994 {\n static class Scanner {\n BufferedReader br;\n StringTokenizer tk = new StringTokenizer(\"\");\n\n public Scanner(InputStream is) {\n br = new BufferedReader(new InputStreamReader(is));\n }\n\n public int nextInt() throws IOException {\n if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextInt();\n }\n\n public long nextLong() throws IOException {\n if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextLong();\n }\n\n public String next() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return next();\n }\n\n public String nextLine() throws IOException {\n tk = new StringTokenizer(\"\");\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n tk = new StringTokenizer(br.readLine());\n return nextDouble();\n }\n\n public char nextChar() throws IOException {\n if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n tk = new StringTokenizer(br.readLine());\n return nextChar();\n }\n\n public int[] nextIntArray(int n) throws IOException {\n int a[] = new int[n];\n for (int i = 0; i < n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArray(int n) throws IOException {\n long a[] = new long[n];\n for (int i = 0; i < n; i++) a[i] = nextLong();\n return a;\n }\n\n public int[] nextIntArrayOneBased(int n) throws IOException {\n int a[] = new int[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextInt();\n return a;\n }\n\n public long[] nextLongArrayOneBased(int n) throws IOException {\n long a[] = new long[n + 1];\n for (int i = 1; i <= n; i++) a[i] = nextLong();\n return a;\n }\n }\n\n public static void main(String args[]) throws IOException {\n Scanner in = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int x1[] = new int[4];\n int y1[] = new int[4];\n int x2[] = new int[4];\n int y2[] = new int[4];\n for (int i = 0; i < 4; i++) {\n x1[i] = in.nextInt();\n y1[i] = in.nextInt();\n }\n\n for (int i = 0; i < 4; i++) {\n x2[i] = in.nextInt();\n y2[i] = in.nextInt();\n }\n Polygon p1 = new Polygon(x1, y1, 4);\n Polygon p2 = new Polygon(x2, y2, 4);\n Area a = new Area(p1);\n a.intersect(new Area(p2));\n boolean ans = !a.isEmpty();\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n }\n }\n\n for (int i = 0; i < 4; i++) {\n for (int j = 0; j < 4; j++) {\n if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n }\n }\n if (ans) out.println(\"Yes\");\n else out.println(\"No\");\n out.close();\n }\n\n static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n int minx = Math.min(x1, x2);\n int miny = Math.min(y1, y2);\n int maxx = Math.max(x1, x2);\n int maxy = Math.max(y1, y2);\n if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n return false;\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.awt.Polygon;\n+import java.awt.geom.Area;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n+public class C994 {\n+ static class Scanner {\n+ BufferedReader br;\n+ StringTokenizer tk = new StringTokenizer(\"\");\n+\n+ public Scanner(InputStream is) {\n+ br = new BufferedReader(new InputStreamReader(is));\n+ }\n+\n+ public int nextInt() throws IOException {\n+ if (tk.hasMoreTokens()) return Integer.parseInt(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextInt();\n+ }\n+\n+ public long nextLong() throws IOException {\n+ if (tk.hasMoreTokens()) return Long.parseLong(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextLong();\n+ }\n+\n+ public String next() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return next();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ tk = new StringTokenizer(\"\");\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ if (tk.hasMoreTokens()) return Double.parseDouble(tk.nextToken());\n+ tk = new StringTokenizer(br.readLine());\n+ return nextDouble();\n+ }\n+\n+ public char nextChar() throws IOException {\n+ if (tk.hasMoreTokens()) return (tk.nextToken().charAt(0));\n+ tk = new StringTokenizer(br.readLine());\n+ return nextChar();\n+ }\n+\n+ public int[] nextIntArray(int n) throws IOException {\n+ int a[] = new int[n];\n+ for (int i = 0; i < n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArray(int n) throws IOException {\n+ long a[] = new long[n];\n+ for (int i = 0; i < n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+\n+ public int[] nextIntArrayOneBased(int n) throws IOException {\n+ int a[] = new int[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextInt();\n+ return a;\n+ }\n+\n+ public long[] nextLongArrayOneBased(int n) throws IOException {\n+ long a[] = new long[n + 1];\n+ for (int i = 1; i <= n; i++) a[i] = nextLong();\n+ return a;\n+ }\n+ }\n+\n+ public static void main(String args[]) throws IOException {\n+ Scanner in = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int x1[] = new int[4];\n+ int y1[] = new int[4];\n+ int x2[] = new int[4];\n+ int y2[] = new int[4];\n+ for (int i = 0; i < 4; i++) {\n+ x1[i] = in.nextInt();\n+ y1[i] = in.nextInt();\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ x2[i] = in.nextInt();\n+ y2[i] = in.nextInt();\n+ }\n+ Polygon p1 = new Polygon(x1, y1, 4);\n+ Polygon p2 = new Polygon(x2, y2, 4);\n+ Area a = new Area(p1);\n+ a.intersect(new Area(p2));\n+ boolean ans = !a.isEmpty();\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x1[j], y1[j], x1[(j + 1) % 4], y1[(j + 1) % 4], x2[i], y2[i])) ans = true;\n+ }\n+ }\n+\n+ for (int i = 0; i < 4; i++) {\n+ for (int j = 0; j < 4; j++) {\n+ if (contains(x2[j], y2[j], x2[(j + 1) % 4], y2[(j + 1) % 4], x1[i], y1[i])) ans = true;\n+ }\n+ }\n+ if (ans) out.println(\"Yes\");\n+ else out.println(\"No\");\n out.close();\n }\n \n- static class TaskE {\n- class pair {\n- double x, y;\n-\n- pair(double a, double b) {\n- x = a;\n- y = b;\n- }\n+ static boolean contains(int x1, int y1, int x2, int y2, int x, int y) {\n+ int minx = Math.min(x1, x2);\n+ int miny = Math.min(y1, y2);\n+ int maxx = Math.max(x1, x2);\n+ int maxy = Math.max(y1, y2);\n+ if (x >= minx && x <= maxx && y >= miny && y <= maxy) {\n+ if ((y1 - y) * (x2 - x) == (y2 - y) * (x1 - x)) return true;\n }\n-\n- pair a[][] = new pair[2][4];\n-\n- boolean chk(double x, double y) {\n- if (a[0][0].x == a[0][1].x) {\n- if ((x - a[0][0].x) * (x - a[0][3].x) > 0 || (y - a[0][0].y) * (y - a[0][1].y) > 0)\n- return false;\n- } else {\n- if ((x - a[0][0].x) * (x - a[0][1].x) > 0 || (y - a[0][0].y) * (y - a[0][3].y) > 0)\n- return false;\n- }\n- double m1 = (a[1][1].y - a[1][0].y) / (a[1][1].x - a[1][0].x);\n- double m2 = (a[1][3].y - a[1][0].y) / (a[1][3].x - a[1][0].x);\n-\n- if ((y - a[1][1].y - m1 * (x - a[1][1].x)) * (y - a[1][3].y - m1 * (x - a[1][3].x)) > 0\n- || (y - a[1][1].y - m2 * (x - a[1][1].x)) * (y - a[1][3].y - m2 * (x - a[1][3].x)) > 0)\n- return false;\n- return true;\n- }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- for (int i = 0; i < 2; i++) {\n- for (int j = 0; j < 4; j++) {\n- a[i][j] = new pair(in.nextInt(), in.nextInt());\n- }\n- }\n-\n- for (int i = -100; i <= 100; i++) {\n- for (int j = -100; j <= 100; j++) {\n- if (chk(i, j)) {\n- out.print(\"YES\");\n- return;\n- }\n- }\n- }\n- out.print(\"NO\");\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ return false;\n }\n }", "output": "FASTER 0.2621", "pair_id": "java_4732_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.1992} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.Closeable;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.UncheckedIOException;\nimport java.io.Writer;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n thread.start();\n thread.join();\n }\n\n static class TaskAdapter implements Runnable {\n @Override\n public void run() {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastInput in = new FastInput(inputStream);\n FastOutput out = new FastOutput(outputStream);\n ATwoSquares solver = new ATwoSquares();\n solver.solve(1, in, out);\n out.close();\n }\n }\n\n static class ATwoSquares {\n public void solve(int testNumber, FastInput in, FastOutput out) {\n Rect r1 = new Rect();\n Rect r2 = new Rect();\n for (int i = 0; i < 4; i++) {\n r1.update(in.readInt(), in.readInt());\n }\n for (int i = 0; i < 4; i++) {\n r2.update(in.readInt(), in.readInt());\n }\n\n for (int x = -100; x <= 100; x++) {\n for (int y = -100; y <= 100; y++) {\n if (contain1(r1, x, y) && contain2(r2, x, y)) {\n out.println(\"YES\");\n return;\n }\n }\n }\n out.println(\"NO\");\n }\n\n public boolean contain1(Rect rect, int x, int y) {\n return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n }\n\n public boolean contain2(Rect rect, int x, int y) {\n int cx = (rect.l + rect.r) / 2;\n int cy = (rect.b + rect.t) / 2;\n int dist = Math.abs(cx - x) + Math.abs(cy - y);\n return dist <= cx - rect.l;\n }\n }\n\n static class FastInput {\n private final InputStream is;\n private byte[] buf = new byte[1 << 20];\n private int bufLen;\n private int bufOffset;\n private int next;\n\n public FastInput(InputStream is) {\n this.is = is;\n }\n\n private int read() {\n while (bufLen == bufOffset) {\n bufOffset = 0;\n try {\n bufLen = is.read(buf);\n } catch (IOException e) {\n bufLen = -1;\n }\n if (bufLen == -1) {\n return -1;\n }\n }\n return buf[bufOffset++];\n }\n\n public void skipBlank() {\n while (next >= 0 && next <= 32) {\n next = read();\n }\n }\n\n public int readInt() {\n int sign = 1;\n\n skipBlank();\n if (next == '+' || next == '-') {\n sign = next == '+' ? 1 : -1;\n next = read();\n }\n\n int val = 0;\n if (sign == 1) {\n while (next >= '0' && next <= '9') {\n val = val * 10 + next - '0';\n next = read();\n }\n } else {\n while (next >= '0' && next <= '9') {\n val = val * 10 - next + '0';\n next = read();\n }\n }\n\n return val;\n }\n }\n\n static class Rect {\n int l = 100;\n int r = -100;\n int t = -100;\n int b = 100;\n\n public void update(int x, int y) {\n l = Math.min(l, x);\n r = Math.max(r, x);\n t = Math.max(t, y);\n b = Math.min(b, y);\n }\n }\n\n static class FastOutput implements AutoCloseable, Closeable, Appendable {\n private StringBuilder cache = new StringBuilder(10 << 20);\n private final Writer os;\n\n public FastOutput append(CharSequence csq) {\n cache.append(csq);\n return this;\n }\n\n public FastOutput append(CharSequence csq, int start, int end) {\n cache.append(csq, start, end);\n return this;\n }\n\n public FastOutput(Writer os) {\n this.os = os;\n }\n\n public FastOutput(OutputStream os) {\n this(new OutputStreamWriter(os));\n }\n\n public FastOutput append(char c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput append(String c) {\n cache.append(c);\n return this;\n }\n\n public FastOutput println(String c) {\n return append(c).println();\n }\n\n public FastOutput println() {\n cache.append(System.lineSeparator());\n return this;\n }\n\n public FastOutput flush() {\n try {\n os.append(cache);\n os.flush();\n cache.setLength(0);\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n return this;\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n throw new UncheckedIOException(e);\n }\n }\n\n public String toString() {\n return cache.toString();\n }\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\nimport java.util.StringTokenizer;\n\npublic class C {\n static class FastWriter {\n private final BufferedWriter bw;\n\n public FastWriter() {\n this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n }\n\n public void print(Object object) throws IOException {\n bw.append(\"\" + object);\n }\n\n public void println(Object object) throws IOException {\n print(object);\n bw.append(\"\\n\");\n }\n\n public void close() throws IOException {\n bw.close();\n }\n }\n\n static class FastReader {\n BufferedReader br;\n StringTokenizer st;\n\n public FastReader() {\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n String next() {\n while (st == null || !st.hasMoreElements()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n return st.nextToken();\n }\n\n int nextInt() {\n return Integer.parseInt(next());\n }\n\n long nextLong() {\n return Long.parseLong(next());\n }\n\n double nextDouble() {\n return Double.parseDouble(next());\n }\n\n String nextLine() {\n String str = \"\";\n try {\n str = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n return str;\n }\n\n BigInteger nextBigInteger() {\n try {\n return new BigInteger(nextLine());\n } catch (NumberFormatException e) {\n throw new InputMismatchException();\n }\n }\n }\n\n public static class point implements Comparable {\n double x;\n double y;\n\n point(double x, double y) {\n this.x = x;\n this.y = y;\n }\n\n @Override\n public int compareTo(point o) {\n double a = this.x + this.y;\n double b = o.x + o.y;\n if (a == b) {\n return (int) (this.y - o.y);\n } else {\n return (int) (a - b);\n }\n }\n }\n\n public static class line {\n double x;\n double y;\n\n line(point a, point b, double x) {\n this.x = x;\n this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n\n public static void main(String[] args) {\n FastReader fr = new FastReader();\n FastWriter fw = new FastWriter();\n point[] one = new point[4];\n point[] two = new point[4];\n for (int i = 0; i < 4; i++) {\n one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n\n for (int i = 0; i < 4; i++) {\n two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n Arrays.sort(one);\n point temp = one[3];\n one[3] = one[2];\n one[2] = temp;\n\n point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n point[] tarr = two;\n two = new point[5];\n for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n two[4] = five;\n for (int i = 0; i < 5; i++) {\n double vala = one[0].y - two[i].y;\n double valb = one[2].y - two[i].y;\n double valc = one[2].x - two[i].x;\n double vald = one[0].x - two[i].x;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n for (int i = 0; i < 4; i++) {\n line a = new line(two[0], two[1], one[i].x);\n line b = new line(two[2], two[3], one[i].x);\n\n line c = new line(two[1], two[2], one[i].x);\n line d = new line(two[3], two[0], one[i].x);\n\n double vala = one[i].y - a.y;\n double valb = one[i].y - b.y;\n double valc = one[i].y - c.y;\n double vald = one[i].y - d.y;\n\n if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n System.out.println(\"YES\");\n return;\n }\n }\n System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.Closeable;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.UncheckedIOException;\n-import java.io.Writer;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws Exception {\n- Thread thread = new Thread(null, new TaskAdapter(), \"\", 1 << 27);\n- thread.start();\n- thread.join();\n- }\n+public class C {\n+ static class FastWriter {\n+ private final BufferedWriter bw;\n \n- static class TaskAdapter implements Runnable {\n- @Override\n- public void run() {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastInput in = new FastInput(inputStream);\n- FastOutput out = new FastOutput(outputStream);\n- ATwoSquares solver = new ATwoSquares();\n- solver.solve(1, in, out);\n- out.close();\n+ public FastWriter() {\n+ this.bw = new BufferedWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ public void print(Object object) throws IOException {\n+ bw.append(\"\" + object);\n+ }\n+\n+ public void println(Object object) throws IOException {\n+ print(object);\n+ bw.append(\"\\n\");\n+ }\n+\n+ public void close() throws IOException {\n+ bw.close();\n }\n }\n \n- static class ATwoSquares {\n- public void solve(int testNumber, FastInput in, FastOutput out) {\n- Rect r1 = new Rect();\n- Rect r2 = new Rect();\n- for (int i = 0; i < 4; i++) {\n- r1.update(in.readInt(), in.readInt());\n- }\n- for (int i = 0; i < 4; i++) {\n- r2.update(in.readInt(), in.readInt());\n- }\n+ static class FastReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n \n- for (int x = -100; x <= 100; x++) {\n- for (int y = -100; y <= 100; y++) {\n- if (contain1(r1, x, y) && contain2(r2, x, y)) {\n- out.println(\"YES\");\n- return;\n- }\n+ public FastReader() {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreElements()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n }\n- out.println(\"NO\");\n+ return st.nextToken();\n }\n \n- public boolean contain1(Rect rect, int x, int y) {\n- return x >= rect.l && x <= rect.r && y >= rect.b && y <= rect.t;\n+ int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public boolean contain2(Rect rect, int x, int y) {\n- int cx = (rect.l + rect.r) / 2;\n- int cy = (rect.b + rect.t) / 2;\n- int dist = Math.abs(cx - x) + Math.abs(cy - y);\n- return dist <= cx - rect.l;\n+ long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ String nextLine() {\n+ String str = \"\";\n+ try {\n+ str = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return str;\n+ }\n+\n+ BigInteger nextBigInteger() {\n+ try {\n+ return new BigInteger(nextLine());\n+ } catch (NumberFormatException e) {\n+ throw new InputMismatchException();\n+ }\n }\n }\n \n- static class FastInput {\n- private final InputStream is;\n- private byte[] buf = new byte[1 << 20];\n- private int bufLen;\n- private int bufOffset;\n- private int next;\n+ public static class point implements Comparable {\n+ double x;\n+ double y;\n \n- public FastInput(InputStream is) {\n- this.is = is;\n+ point(double x, double y) {\n+ this.x = x;\n+ this.y = y;\n }\n \n- private int read() {\n- while (bufLen == bufOffset) {\n- bufOffset = 0;\n- try {\n- bufLen = is.read(buf);\n- } catch (IOException e) {\n- bufLen = -1;\n- }\n- if (bufLen == -1) {\n- return -1;\n- }\n+ @Override\n+ public int compareTo(point o) {\n+ double a = this.x + this.y;\n+ double b = o.x + o.y;\n+ if (a == b) {\n+ return (int) (this.y - o.y);\n+ } else {\n+ return (int) (a - b);\n }\n- return buf[bufOffset++];\n- }\n-\n- public void skipBlank() {\n- while (next >= 0 && next <= 32) {\n- next = read();\n- }\n- }\n-\n- public int readInt() {\n- int sign = 1;\n-\n- skipBlank();\n- if (next == '+' || next == '-') {\n- sign = next == '+' ? 1 : -1;\n- next = read();\n- }\n-\n- int val = 0;\n- if (sign == 1) {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 + next - '0';\n- next = read();\n- }\n- } else {\n- while (next >= '0' && next <= '9') {\n- val = val * 10 - next + '0';\n- next = read();\n- }\n- }\n-\n- return val;\n }\n }\n \n- static class Rect {\n- int l = 100;\n- int r = -100;\n- int t = -100;\n- int b = 100;\n+ public static class line {\n+ double x;\n+ double y;\n \n- public void update(int x, int y) {\n- l = Math.min(l, x);\n- r = Math.max(r, x);\n- t = Math.max(t, y);\n- b = Math.min(b, y);\n+ line(point a, point b, double x) {\n+ this.x = x;\n+ this.y = (((b.y - a.y) * (x - a.x)) / (b.x - a.x)) + a.y;\n }\n }\n \n- static class FastOutput implements AutoCloseable, Closeable, Appendable {\n- private StringBuilder cache = new StringBuilder(10 << 20);\n- private final Writer os;\n-\n- public FastOutput append(CharSequence csq) {\n- cache.append(csq);\n- return this;\n+ public static void main(String[] args) {\n+ FastReader fr = new FastReader();\n+ FastWriter fw = new FastWriter();\n+ point[] one = new point[4];\n+ point[] two = new point[4];\n+ for (int i = 0; i < 4; i++) {\n+ one[i] = new point(fr.nextInt(), fr.nextInt());\n }\n \n- public FastOutput append(CharSequence csq, int start, int end) {\n- cache.append(csq, start, end);\n- return this;\n+ for (int i = 0; i < 4; i++) {\n+ two[i] = new point(fr.nextInt(), fr.nextInt());\n }\n+ Arrays.sort(one);\n+ point temp = one[3];\n+ one[3] = one[2];\n+ one[2] = temp;\n \n- public FastOutput(Writer os) {\n- this.os = os;\n- }\n+ point five = new point((two[2].x + two[0].x) / 2, (two[2].y + two[0].y) / 2);\n+ point[] tarr = two;\n+ two = new point[5];\n+ for (int i = 0; i < tarr.length; i++) two[i] = tarr[i];\n+ two[4] = five;\n+ for (int i = 0; i < 5; i++) {\n+ double vala = one[0].y - two[i].y;\n+ double valb = one[2].y - two[i].y;\n+ double valc = one[2].x - two[i].x;\n+ double vald = one[0].x - two[i].x;\n \n- public FastOutput(OutputStream os) {\n- this(new OutputStreamWriter(os));\n- }\n-\n- public FastOutput append(char c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput append(String c) {\n- cache.append(c);\n- return this;\n- }\n-\n- public FastOutput println(String c) {\n- return append(c).println();\n- }\n-\n- public FastOutput println() {\n- cache.append(System.lineSeparator());\n- return this;\n- }\n-\n- public FastOutput flush() {\n- try {\n- os.append(cache);\n- os.flush();\n- cache.setLength(0);\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n- }\n- return this;\n- }\n-\n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- throw new UncheckedIOException(e);\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n }\n }\n+ for (int i = 0; i < 4; i++) {\n+ line a = new line(two[0], two[1], one[i].x);\n+ line b = new line(two[2], two[3], one[i].x);\n \n- public String toString() {\n- return cache.toString();\n+ line c = new line(two[1], two[2], one[i].x);\n+ line d = new line(two[3], two[0], one[i].x);\n+\n+ double vala = one[i].y - a.y;\n+ double valb = one[i].y - b.y;\n+ double valc = one[i].y - c.y;\n+ double vald = one[i].y - d.y;\n+\n+ if ((vala >= 0 && valb <= 0 || vala <= 0 && valb >= 0)\n+ && (valc >= 0 && vald <= 0 || valc <= 0 && vald >= 0)) {\n+ System.out.println(\"YES\");\n+ return;\n+ }\n }\n+ System.out.println(\"NO\");\n }\n }", "output": "FASTER 2.0187", "pair_id": "java_4716_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 4.0521} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class TaskC {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int[] arr = {0, 0, 0};\n int x = sc.nextInt();\n arr[x] = 1;\n int i = 0;\n for (i = n; i > 0 && arr[1] != 1; i--) {\n if (i % 2 == 0) {\n int t = arr[1];\n arr[1] = arr[2];\n arr[2] = t;\n } else {\n int t = arr[0];\n arr[0] = arr[1];\n arr[1] = t;\n }\n }\n if (i == 0) {\n for (int j = 0; j < 3; j++) {\n if (arr[j] == 1) {\n System.out.println(j);\n break;\n }\n }\n } else {\n if (i % 2 == 0) {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(2);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(0);\n }\n } else {\n if (i % 6 <= 2 && i % 6 > 0) {\n System.out.println(0);\n } else if (i % 6 == 3 || i % 6 == 0) {\n System.out.println(1);\n } else {\n System.out.println(2);\n }\n }\n }\n\n sc.close();\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class ShellGame {\n public static void main(String[] args) {\n Scanner nw = new Scanner(System.in);\n int n = nw.nextInt();\n int pos = nw.nextInt();\n String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n (n) %= elm.length;\n System.out.println(elm[n].charAt(pos));\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class TaskC {\n-\n+public class ShellGame {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int[] arr = {0, 0, 0};\n- int x = sc.nextInt();\n- arr[x] = 1;\n- int i = 0;\n- for (i = n; i > 0 && arr[1] != 1; i--) {\n- if (i % 2 == 0) {\n- int t = arr[1];\n- arr[1] = arr[2];\n- arr[2] = t;\n- } else {\n- int t = arr[0];\n- arr[0] = arr[1];\n- arr[1] = t;\n- }\n- }\n- if (i == 0) {\n- for (int j = 0; j < 3; j++) {\n- if (arr[j] == 1) {\n- System.out.println(j);\n- break;\n- }\n- }\n- } else {\n- if (i % 2 == 0) {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(2);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(0);\n- }\n- } else {\n- if (i % 6 <= 2 && i % 6 > 0) {\n- System.out.println(0);\n- } else if (i % 6 == 3 || i % 6 == 0) {\n- System.out.println(1);\n- } else {\n- System.out.println(2);\n- }\n- }\n- }\n-\n- sc.close();\n+ Scanner nw = new Scanner(System.in);\n+ int n = nw.nextInt();\n+ int pos = nw.nextInt();\n+ String[] elm = new String[] {\"012\", \"102\", \"120\", \"210\", \"201\", \"021\"};\n+ (n) %= elm.length;\n+ System.out.println(elm[n].charAt(pos));\n }\n }", "output": "SLOWER 0.1388", "pair_id": "java_425_reversed", "problem_id": "777_A", "language": "java", "direction": "reversed", "speedup_ratio": 1.101} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class a1140 {\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n int i, p = 0, n;\n n = in.nextInt();\n for (i = n; i > 2; i--) {\n p += i * (i - 1);\n }\n System.out.println(p);\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n Scanner input = new Scanner(System.in);\n while (input.hasNext()) {\n int n = input.nextInt();\n long[][] dp = new long[n + 1][n + 1];\n for (long i = n; i >= 1; i--) {\n for (long j = i + 2; j <= n; j++) {\n if (j == i + 2) {\n dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n continue;\n }\n dp[(int) (i)][(int) (j)] =\n Math.min(\n dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n }\n }\n System.out.println(dp[1][n]);\n }\n }\n\n static long modFact(int n, long p) {\n if (n >= p) return 0;\n\n long result = 1;\n for (int i = 1; i <= n; i++) result = (result * i) % p;\n\n return result;\n }\n\n static boolean isPrime(int n) {\n\n if (n <= 1) return false;\n\n for (int i = 2; i < n; i++) if (n % i == 0) return false;\n\n return true;\n }\n\n public static long fac(long n) {\n if (n == 1) {\n return 1;\n }\n return n * fac(n - 1);\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.IOException;\n import java.util.*;\n \n-public class a1140 {\n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- int i, p = 0, n;\n- n = in.nextInt();\n- for (i = n; i > 2; i--) {\n- p += i * (i - 1);\n+public class Main {\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner input = new Scanner(System.in);\n+ while (input.hasNext()) {\n+ int n = input.nextInt();\n+ long[][] dp = new long[n + 1][n + 1];\n+ for (long i = n; i >= 1; i--) {\n+ for (long j = i + 2; j <= n; j++) {\n+ if (j == i + 2) {\n+ dp[(int) (i)][(int) (j)] = i * (i + 1) * (i + 2);\n+ continue;\n+ }\n+ dp[(int) (i)][(int) (j)] =\n+ Math.min(\n+ dp[(int) (i)][(int) (j - 1)] + (i * j * (j - 1)),\n+ dp[(int) (i)][(int) (j - 2)] + dp[(int) (j - 2)][(int) (j)] + i * j * (j - 2));\n+ }\n+ }\n+ System.out.println(dp[1][n]);\n }\n- System.out.println(p);\n+ }\n+\n+ static long modFact(int n, long p) {\n+ if (n >= p) return 0;\n+\n+ long result = 1;\n+ for (int i = 1; i <= n; i++) result = (result * i) % p;\n+\n+ return result;\n+ }\n+\n+ static boolean isPrime(int n) {\n+\n+ if (n <= 1) return false;\n+\n+ for (int i = 2; i < n; i++) if (n % i == 0) return false;\n+\n+ return true;\n+ }\n+\n+ public static long fac(long n) {\n+ if (n == 1) {\n+ return 1;\n+ }\n+ return n * fac(n - 1);\n }\n }", "output": "SLOWER 0.1333", "pair_id": "java_204_reversed", "problem_id": "1140_D", "language": "java", "direction": "reversed", "speedup_ratio": 1.0968} -{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.awt.*;\nimport java.util.Scanner;\n\npublic class TwoSquares {\n public static void main(String[] args) {\n Scanner s = new Scanner(System.in);\n\n int minX = Integer.MAX_VALUE;\n int maxX = Integer.MIN_VALUE;\n int minY = Integer.MAX_VALUE;\n int maxY = Integer.MIN_VALUE;\n\n for (int i = 0; i < 4; i++) {\n int x = s.nextInt();\n int y = s.nextInt();\n minX = Math.min(x, minX);\n maxX = Math.max(x, maxX);\n minY = Math.min(y, minY);\n maxY = Math.max(y, maxY);\n }\n int[] xPoints = new int[4];\n int[] yPoints = new int[4];\n for (int i = 0; i < 4; i++) {\n xPoints[i] = s.nextInt();\n yPoints[i] = s.nextInt();\n }\n\n boolean overlap = false;\n Polygon p = new Polygon(xPoints, yPoints, 4);\n for (int i = minX; i <= maxX; i++) {\n for (int j = minY; j <= maxY; j++) {\n if (p.contains(i - 0.1, j)) overlap = true;\n else if (p.contains(i + 0.1, j)) overlap = true;\n else if (p.contains(i, j - 0.1)) overlap = true;\n else if (p.contains(i, j + 0.1)) overlap = true;\n }\n }\n\n if (overlap) System.out.println(\"YES\");\n else System.out.println(\"NO\");\n }\n}\n\n```\n\n=== Code B (Modified) ===\n```java\nimport java.awt.Polygon;\nimport java.awt.Rectangle;\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskA solver = new TaskA();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskA {\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n Polygon p1 = new Polygon();\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n p1.addPoint(in.nextInt(), in.nextInt());\n Rectangle r = p1.getBounds();\n Polygon p2 = new Polygon();\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n p2.addPoint(in.nextInt(), in.nextInt());\n boolean inside = p2.intersects(r);\n boolean point = false;\n point |= intersPoint(p1, p2);\n point |= intersPoint(p2, p1);\n out.println((inside || point) ? \"YES\" : \"NO\");\n }\n\n boolean intersPoint(Polygon p1, Polygon p2) {\n for (int i = 0; i < p1.npoints; i++) {\n int i2 = (i + 1) % p1.npoints;\n int dx = p1.xpoints[i] - p1.xpoints[i2];\n int dy = p1.ypoints[i] - p1.ypoints[i2];\n Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n for (int j = 0; j < p2.npoints; j++) {\n dx = p1.xpoints[i] - p2.xpoints[j];\n dy = p1.ypoints[i] - p2.ypoints[j];\n Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n dx = p2.xpoints[j] - p1.xpoints[i2];\n dy = p2.ypoints[j] - p1.ypoints[i2];\n Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n if (edge1 + edge2 == edge) return true;\n }\n }\n return false;\n }\n }\n\n static class InputReader {\n private StringTokenizer tokenizer;\n private BufferedReader reader;\n\n public InputReader(InputStream inputStream) {\n reader = new BufferedReader(new InputStreamReader(inputStream));\n }\n\n private void fillTokenizer() {\n if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n try {\n tokenizer = new StringTokenizer(reader.readLine());\n } catch (Exception e) {\n throw new RuntimeException(e);\n }\n }\n }\n\n public String next() {\n fillTokenizer();\n return tokenizer.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.awt.*;\n-import java.util.Scanner;\n+import java.awt.Polygon;\n+import java.awt.Rectangle;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.StringTokenizer;\n \n-public class TwoSquares {\n+public class Main {\n public static void main(String[] args) {\n- Scanner s = new Scanner(System.in);\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskA solver = new TaskA();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- int minX = Integer.MAX_VALUE;\n- int maxX = Integer.MIN_VALUE;\n- int minY = Integer.MAX_VALUE;\n- int maxY = Integer.MIN_VALUE;\n-\n- for (int i = 0; i < 4; i++) {\n- int x = s.nextInt();\n- int y = s.nextInt();\n- minX = Math.min(x, minX);\n- maxX = Math.max(x, maxX);\n- minY = Math.min(y, minY);\n- maxY = Math.max(y, maxY);\n- }\n- int[] xPoints = new int[4];\n- int[] yPoints = new int[4];\n- for (int i = 0; i < 4; i++) {\n- xPoints[i] = s.nextInt();\n- yPoints[i] = s.nextInt();\n+ static class TaskA {\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ Polygon p1 = new Polygon();\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ p1.addPoint(in.nextInt(), in.nextInt());\n+ Rectangle r = p1.getBounds();\n+ Polygon p2 = new Polygon();\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ p2.addPoint(in.nextInt(), in.nextInt());\n+ boolean inside = p2.intersects(r);\n+ boolean point = false;\n+ point |= intersPoint(p1, p2);\n+ point |= intersPoint(p2, p1);\n+ out.println((inside || point) ? \"YES\" : \"NO\");\n }\n \n- boolean overlap = false;\n- Polygon p = new Polygon(xPoints, yPoints, 4);\n- for (int i = minX; i <= maxX; i++) {\n- for (int j = minY; j <= maxY; j++) {\n- if (p.contains(i - 0.1, j)) overlap = true;\n- else if (p.contains(i + 0.1, j)) overlap = true;\n- else if (p.contains(i, j - 0.1)) overlap = true;\n- else if (p.contains(i, j + 0.1)) overlap = true;\n+ boolean intersPoint(Polygon p1, Polygon p2) {\n+ for (int i = 0; i < p1.npoints; i++) {\n+ int i2 = (i + 1) % p1.npoints;\n+ int dx = p1.xpoints[i] - p1.xpoints[i2];\n+ int dy = p1.ypoints[i] - p1.ypoints[i2];\n+ Double edge = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ for (int j = 0; j < p2.npoints; j++) {\n+ dx = p1.xpoints[i] - p2.xpoints[j];\n+ dy = p1.ypoints[i] - p2.ypoints[j];\n+ Double edge1 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ dx = p2.xpoints[j] - p1.xpoints[i2];\n+ dy = p2.ypoints[j] - p1.ypoints[i2];\n+ Double edge2 = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));\n+ if (edge1 + edge2 == edge) return true;\n+ }\n+ }\n+ return false;\n+ }\n+ }\n+\n+ static class InputReader {\n+ private StringTokenizer tokenizer;\n+ private BufferedReader reader;\n+\n+ public InputReader(InputStream inputStream) {\n+ reader = new BufferedReader(new InputStreamReader(inputStream));\n+ }\n+\n+ private void fillTokenizer() {\n+ if (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ try {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException(e);\n+ }\n }\n }\n \n- if (overlap) System.out.println(\"YES\");\n- else System.out.println(\"NO\");\n+ public String next() {\n+ fillTokenizer();\n+ return tokenizer.nextToken();\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "FASTER 0.664", "pair_id": "java_4767_forward", "problem_id": "994_C", "language": "java", "direction": "forward", "speedup_ratio": 1.5845} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0114", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0079, "pair_id": "java_8223_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n-\n+class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "SLOWER 0.0114", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0079, "pair_id": "java_8223_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n- int ans = x;\n+\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0647", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0459, "pair_id": "java_8206_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n-\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0647", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0459, "pair_id": "java_8206_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n- for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.203", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1511, "pair_id": "java_8198_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n+ for (int i = 0; i < 10; i++) {\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.203", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1511, "pair_id": "java_8198_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0464", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0327, "pair_id": "java_8216_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0464", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0327, "pair_id": "java_8216_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n-\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n- for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "FASTER 0.0888", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0635, "pair_id": "java_8273_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String arg[]) {\n+\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n+ for (int i = 0; i < 10; i++) {\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0888", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0635, "pair_id": "java_8273_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0539", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0381, "pair_id": "java_8227_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0539", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0381, "pair_id": "java_8227_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n+ int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "FASTER 0.113", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0815, "pair_id": "java_8270_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.113", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0815, "pair_id": "java_8270_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.1076", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0774, "pair_id": "java_8219_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1076", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0774, "pair_id": "java_8219_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n-\n+class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n+ int d = sc.nextInt();\n int x = sc.nextInt();\n-\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.0903", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0646, "pair_id": "java_8247_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n+ int D = sc.nextInt();\n int x = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0903", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0646, "pair_id": "java_8247_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.1376", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1001, "pair_id": "java_8197_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1376", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1001, "pair_id": "java_8197_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.1096", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0789, "pair_id": "java_8220_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1096", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0789, "pair_id": "java_8220_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n-\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "FASTER 0.0477", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0336, "pair_id": "java_8269_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n- int ans = x;\n+\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0477", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0336, "pair_id": "java_8269_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n-\n+class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n \n- int r = sc.nextInt();\n+ int R = sc.nextInt();\n int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n+ int X = sc.nextInt();\n \n- int X = X2000;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n+ X = R * X - D;\n System.out.println(X);\n }\n }\n }", "output": "FASTER 0.1496", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1093, "pair_id": "java_8255_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n \n- int R = sc.nextInt();\n+ int r = sc.nextInt();\n int D = sc.nextInt();\n- int X = sc.nextInt();\n+ int X2000 = sc.nextInt();\n \n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n+ X = r * X - D;\n+\n System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1496", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1093, "pair_id": "java_8255_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "FASTER 0.0026", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0018, "pair_id": "java_8249_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0026", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0018, "pair_id": "java_8249_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0141", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0098, "pair_id": "java_8233_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n+ Scanner sc = new Scanner(System.in);\n+\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0141", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0098, "pair_id": "java_8233_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String arg[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0861", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0615, "pair_id": "java_8218_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.0861", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0615, "pair_id": "java_8218_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.1357", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0986, "pair_id": "java_8196_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1357", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0986, "pair_id": "java_8196_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.1125", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0811, "pair_id": "java_8209_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1125", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0811, "pair_id": "java_8209_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n+ int R = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n+ int X = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "FASTER 0.0842", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0601, "pair_id": "java_8254_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n+ int r = sc.nextInt();\n int D = sc.nextInt();\n- int X = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0842", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0601, "pair_id": "java_8254_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0029", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.002, "pair_id": "java_8199_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "SLOWER 0.0029", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.002, "pair_id": "java_8199_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n \n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.1017", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.073, "pair_id": "java_8230_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n \n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int x = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1017", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.073, "pair_id": "java_8230_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.1749", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1289, "pair_id": "java_8221_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n \n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1749", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1289, "pair_id": "java_8221_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0112", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0078, "pair_id": "java_8212_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0112", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0078, "pair_id": "java_8212_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0081", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0056, "pair_id": "java_8211_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "SLOWER 0.0081", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0056, "pair_id": "java_8211_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "FASTER 0.0632", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0448, "pair_id": "java_8265_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0632", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0448, "pair_id": "java_8265_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0081", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0056, "pair_id": "java_8232_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "SLOWER 0.0081", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0056, "pair_id": "java_8232_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n+ for (int i = 0; i < 10; i++) {\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0996", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0715, "pair_id": "java_8229_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n- for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0996", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0715, "pair_id": "java_8229_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "FASTER 0.1286", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0932, "pair_id": "java_8266_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1286", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0932, "pair_id": "java_8266_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0964", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0691, "pair_id": "java_8238_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0964", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0691, "pair_id": "java_8238_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0393", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0276, "pair_id": "java_8189_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0393", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0276, "pair_id": "java_8189_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n+ x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0984", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0706, "pair_id": "java_8239_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n+\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n+ x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0984", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0706, "pair_id": "java_8239_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.028", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0196, "pair_id": "java_8187_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "SLOWER 0.028", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0196, "pair_id": "java_8187_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n- for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0899", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0643, "pair_id": "java_8194_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+ int ans = x;\n+ for (int i = 0; i < 10; i++) {\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0899", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0643, "pair_id": "java_8194_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.1105", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0796, "pair_id": "java_8208_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.1105", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0796, "pair_id": "java_8208_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0352", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0247, "pair_id": "java_8235_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0352", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0247, "pair_id": "java_8235_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) {\n \n- public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n+ Scanner sc = new Scanner(System.in);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0308", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0216, "pair_id": "java_8204_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n \n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0308", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0216, "pair_id": "java_8204_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n \n int r = sc.nextInt();\n int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n+ int x = sc.nextInt();\n \n- int X = X2000;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.1779", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1312, "pair_id": "java_8210_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n \n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n+ int X2000 = sc.nextInt();\n \n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1779", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1312, "pair_id": "java_8210_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n-\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "FASTER 0.0235", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0164, "pair_id": "java_8272_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String arg[]) {\n+\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0235", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0164, "pair_id": "java_8272_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0252", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0176, "pair_id": "java_8186_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0252", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0176, "pair_id": "java_8186_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String arg[]) {\n- Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+\n+ public static void main(String[] args) {\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0582", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0412, "pair_id": "java_8258_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ public static void main(String arg[]) {\n+ Scanner sc = new Scanner(System.in);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.0582", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0412, "pair_id": "java_8258_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n- for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0474", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0334, "pair_id": "java_8190_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n+ for (int i = 0; i < 10; i++) {\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "SLOWER 0.0474", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0334, "pair_id": "java_8190_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String arg[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.1142", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0824, "pair_id": "java_8195_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.1142", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0824, "pair_id": "java_8195_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n- for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0745", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.053, "pair_id": "java_8193_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n+ for (int i = 0; i < 10; i++) {\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0745", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.053, "pair_id": "java_8193_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n \n- int R = sc.nextInt();\n+ int r = sc.nextInt();\n int D = sc.nextInt();\n- int X = sc.nextInt();\n+ int x = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0283", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0198, "pair_id": "java_8203_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n \n- int r = sc.nextInt();\n+ int R = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n+ int X = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0283", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0198, "pair_id": "java_8203_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n-\n+class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.1556", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1139, "pair_id": "java_8248_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1556", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1139, "pair_id": "java_8248_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String arg[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n+ for (int i = 0; i < 10; i++) {\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "FASTER 0.0397", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0279, "pair_id": "java_8263_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n- for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.0397", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0279, "pair_id": "java_8263_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.056", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0396, "pair_id": "java_8192_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.056", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0396, "pair_id": "java_8192_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.002", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0014, "pair_id": "java_8274_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.002", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0014, "pair_id": "java_8274_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int X2000 = sc.nextInt();\n-\n- int X = X2000;\n for (int i = 0; i < 10; i++) {\n- X = r * X - D;\n-\n- System.out.println(X);\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.1638", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.1202, "pair_id": "java_8240_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int X2000 = sc.nextInt();\n\n int X = X2000;\n for (int i = 0; i < 10; i++) {\n X = r * X - D;\n\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n \n+ Scanner sc = new Scanner(System.in);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X2000 = sc.nextInt();\n+\n+ int X = X2000;\n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ X = r * X - D;\n+\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.1638", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.1202, "pair_id": "java_8240_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0384", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.027, "pair_id": "java_8226_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0384", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.027, "pair_id": "java_8226_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0506", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0357, "pair_id": "java_8236_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0506", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0357, "pair_id": "java_8236_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n- for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.036", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0253, "pair_id": "java_8188_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n+ for (int i = 0; i < 10; i++) {\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "SLOWER 0.036", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0253, "pair_id": "java_8188_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+ int ans = x;\n+ for (int i = 0; i < 10; i++) {\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "FASTER 0.0457", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0322, "pair_id": "java_8268_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n- for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0457", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0322, "pair_id": "java_8268_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n- public static void main(String arg[]) {\n+class Main {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n+ for (int i = 0; i < 10; i++) {\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.0668", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0474, "pair_id": "java_8245_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n- public static void main(String[] args) {\n+public class Main {\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n- for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.0668", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0474, "pair_id": "java_8245_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int x0 = sc.nextInt();\n+ int x1;\n+ for (int i = 0; i < 10; i++) {\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "FASTER 0.0612", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0433, "pair_id": "java_8264_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n- for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0612", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0433, "pair_id": "java_8264_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0618", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0438, "pair_id": "java_8217_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0618", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0438, "pair_id": "java_8217_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0253", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0177, "pair_id": "java_8214_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n+\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0253", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0177, "pair_id": "java_8214_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.0272", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.019, "pair_id": "java_8243_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0272", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.019, "pair_id": "java_8243_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x = sc.nextInt();\n+ int x[] = new int[11];\n+ x[0] = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ System.out.println(r * x[i] - d);\n+ x[i + 1] = r * x[i] - d;\n }\n }\n }", "output": "FASTER 0.0193", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0135, "pair_id": "java_8213_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x[] = new int[11];\n x[0] = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n System.out.println(r * x[i] - d);\n x[i + 1] = r * x[i] - d;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n- int x[] = new int[11];\n- x[0] = sc.nextInt();\n-\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- System.out.println(r * x[i] - d);\n- x[i + 1] = r * x[i] - d;\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "SLOWER 0.0193", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0135, "pair_id": "java_8213_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n+ int r = sc.nextInt();\n int D = sc.nextInt();\n- int X = sc.nextInt();\n-\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0174", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0121, "pair_id": "java_8224_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n \n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0174", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0121, "pair_id": "java_8224_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "FASTER 0.0215", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.015, "pair_id": "java_8271_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String arg[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0215", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.015, "pair_id": "java_8271_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n+ int x = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0108", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0075, "pair_id": "java_8200_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "SLOWER 0.0108", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0075, "pair_id": "java_8200_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n-\n public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n+ x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0166", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0116, "pair_id": "java_8234_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n \n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n+ x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0166", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0116, "pair_id": "java_8234_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int D = sc.nextInt();\n+ int d = sc.nextInt();\n int x = sc.nextInt();\n- int ans = x;\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.0426", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.03, "pair_id": "java_8244_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n- int d = sc.nextInt();\n+ int D = sc.nextInt();\n int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0426", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.03, "pair_id": "java_8244_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ int n = sc.nextInt();\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ for (int i = 1; i <= 10; i++) {\n+ b *= n;\n+ b -= a;\n+ System.out.println(b);\n }\n }\n }", "output": "FASTER 0.0534", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0377, "pair_id": "java_8191_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int a = sc.nextInt();\n int b = sc.nextInt();\n for (int i = 1; i <= 10; i++) {\n b *= n;\n b -= a;\n System.out.println(b);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- for (int i = 1; i <= 10; i++) {\n- b *= n;\n- b -= a;\n- System.out.println(b);\n+\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.0534", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0377, "pair_id": "java_8191_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String arg[]) {\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.089", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0636, "pair_id": "java_8207_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n-\n+ public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n-\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.089", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0636, "pair_id": "java_8207_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- long x = sc.nextInt();\n- sc.close();\n- for (int i = 1; i <= 10; i++) {\n- x = r * x - d;\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - D;\n System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0797", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0568, "pair_id": "java_8259_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n long x = sc.nextInt();\n sc.close();\n for (int i = 1; i <= 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ long x = sc.nextInt();\n+ sc.close();\n+ for (int i = 1; i <= 10; i++) {\n+ x = r * x - d;\n System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0797", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0568, "pair_id": "java_8259_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n- public static void main(String arg[]) {\n- Scanner sc = new Scanner(System.in);\n- int a = sc.nextInt();\n- int b = sc.nextInt();\n- int c = sc.nextInt();\n- int m = 0, n = 0;\n- m = a * c - b;\n- System.out.println(m);\n- for (int i = 1; i < 10; i++) {\n- n = m;\n- m = a * n - b;\n- System.out.println(m);\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n+\n+ for (int i = 0; i < 10; i++) {\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0749", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0533, "pair_id": "java_8237_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String arg[]) {\n Scanner sc = new Scanner(System.in);\n int a = sc.nextInt();\n int b = sc.nextInt();\n int c = sc.nextInt();\n int m = 0, n = 0;\n m = a * c - b;\n System.out.println(m);\n for (int i = 1; i < 10; i++) {\n n = m;\n m = a * n - b;\n System.out.println(m);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n-\n- for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ public static void main(String arg[]) {\n+ Scanner sc = new Scanner(System.in);\n+ int a = sc.nextInt();\n+ int b = sc.nextInt();\n+ int c = sc.nextInt();\n+ int m = 0, n = 0;\n+ m = a * c - b;\n+ System.out.println(m);\n+ for (int i = 1; i < 10; i++) {\n+ n = m;\n+ m = a * n - b;\n+ System.out.println(m);\n }\n }\n }", "output": "SLOWER 0.0749", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0533, "pair_id": "java_8237_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+ int D = sc.nextInt();\n+ int x = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "FASTER 0.0494", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0348, "pair_id": "java_8205_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x = sc.nextInt();\n-\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0494", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0348, "pair_id": "java_8205_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n- int r = scanner.nextInt();\n- int d = scanner.nextInt();\n- int x = scanner.nextInt();\n \n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int D = sc.nextInt();\n+ int x2000 = sc.nextInt();\n+ int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- x = r * x - d;\n- System.out.println(x);\n+ temp = r * temp - D;\n+ System.out.println(temp);\n }\n }\n }", "output": "FASTER 0.0033", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0023, "pair_id": "java_8222_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x2000 = sc.nextInt();\n int temp = x2000;\n for (int i = 0; i < 10; i++) {\n temp = r * temp - D;\n System.out.println(temp);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n int r = scanner.nextInt();\n int d = scanner.nextInt();\n int x = scanner.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - d;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+ int r = scanner.nextInt();\n+ int d = scanner.nextInt();\n+ int x = scanner.nextInt();\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int D = sc.nextInt();\n- int x2000 = sc.nextInt();\n- int temp = x2000;\n for (int i = 0; i < 10; i++) {\n- temp = r * temp - D;\n- System.out.println(temp);\n+ x = r * x - d;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0033", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0023, "pair_id": "java_8222_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n-\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.006", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0042, "pair_id": "java_8241_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n+\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "SLOWER 0.006", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0042, "pair_id": "java_8241_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n-\n+class Main {\n public static void main(String[] args) {\n- Scanner stdIn = new Scanner(System.in);\n- int r = stdIn.nextInt();\n- int D = stdIn.nextInt();\n- int x = stdIn.nextInt();\n-\n+ Scanner sc = new Scanner(System.in);\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n- x = r * x - D;\n- System.out.println(x);\n+ int result = r * x - d;\n+ System.out.println(result);\n+ x = result;\n }\n }\n }", "output": "FASTER 0.0086", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.006, "pair_id": "java_8242_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x = sc.nextInt();\n for (int i = 0; i < 10; i++) {\n int result = r * x - d;\n System.out.println(result);\n x = result;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner stdIn = new Scanner(System.in);\n int r = stdIn.nextInt();\n int D = stdIn.nextInt();\n int x = stdIn.nextInt();\n\n for (int i = 0; i < 10; i++) {\n x = r * x - D;\n System.out.println(x);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-class Main {\n+public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x = sc.nextInt();\n+ Scanner stdIn = new Scanner(System.in);\n+ int r = stdIn.nextInt();\n+ int D = stdIn.nextInt();\n+ int x = stdIn.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- int result = r * x - d;\n- System.out.println(result);\n- x = result;\n+ x = r * x - D;\n+ System.out.println(x);\n }\n }\n }", "output": "SLOWER 0.0086", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.006, "pair_id": "java_8242_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n- int d = sc.nextInt();\n- int x0 = sc.nextInt();\n- int x1;\n+\n+ int R = sc.nextInt();\n+ int D = sc.nextInt();\n+ int X = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- x1 = r * x0 - d;\n- System.out.println(x1);\n- x0 = x1;\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "FASTER 0.0211", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0147, "pair_id": "java_8250_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int d = sc.nextInt();\n int x0 = sc.nextInt();\n int x1;\n for (int i = 0; i < 10; i++) {\n x1 = r * x0 - d;\n System.out.println(x1);\n x0 = x1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n- int D = sc.nextInt();\n- int X = sc.nextInt();\n-\n+ int r = sc.nextInt();\n+ int d = sc.nextInt();\n+ int x0 = sc.nextInt();\n+ int x1;\n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ x1 = r * x0 - d;\n+ System.out.println(x1);\n+ x0 = x1;\n }\n }\n }", "output": "SLOWER 0.0211", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0147, "pair_id": "java_8250_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class Main {\n+class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- int r = sc.nextInt();\n+\n+ int R = sc.nextInt();\n int D = sc.nextInt();\n- int x = sc.nextInt();\n- int ans = x;\n+ int X = sc.nextInt();\n+\n for (int i = 0; i < 10; i++) {\n- ans = (r * ans) - D;\n- System.out.println(ans);\n+ X = R * X - D;\n+ System.out.println(X);\n }\n }\n }", "output": "FASTER 0.0365", "problem_id": "p03036", "direction": "forward", "speedup_ratio": 1.0256, "pair_id": "java_8251_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\nclass Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n\n int R = sc.nextInt();\n int D = sc.nextInt();\n int X = sc.nextInt();\n\n for (int i = 0; i < 10; i++) {\n X = R * X - D;\n System.out.println(X);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int r = sc.nextInt();\n int D = sc.nextInt();\n int x = sc.nextInt();\n int ans = x;\n for (int i = 0; i < 10; i++) {\n ans = (r * ans) - D;\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n-\n- int R = sc.nextInt();\n+ int r = sc.nextInt();\n int D = sc.nextInt();\n- int X = sc.nextInt();\n-\n+ int x = sc.nextInt();\n+ int ans = x;\n for (int i = 0; i < 10; i++) {\n- X = R * X - D;\n- System.out.println(X);\n+ ans = (r * ans) - D;\n+ System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.0365", "problem_id": "p03036", "direction": "reversed", "speedup_ratio": 1.0256, "pair_id": "java_8251_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.Collections;\n-import java.util.LinkedHashSet;\n+import java.util.LinkedList;\n import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.NoSuchElementException;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n \n- Scanner sc = new Scanner(System.in);\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n \n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n+ }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n+ }\n \n- Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n \n- String[] array = set.toArray(new String[set.size()]);\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n \n- System.out.println(array[k - 1]);\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n \n- sc.close();\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n }\n }", "output": "FASTER 1.4538", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 2.7393, "pair_id": "java_2066_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n+import java.util.ArrayList;\n import java.util.Collections;\n-import java.util.LinkedList;\n+import java.util.LinkedHashSet;\n import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n+ Scanner sc = new Scanner(System.in);\n \n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n- }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ List list = new ArrayList<>();\n \n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n- }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n- }\n \n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n+ Collections.sort(list);\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n \n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n+ String[] array = set.toArray(new String[set.size()]);\n \n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n+ System.out.println(array[k - 1]);\n \n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ sc.close();\n }\n }", "output": "SLOWER 1.4538", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 2.7393, "pair_id": "java_2066_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.IOException;\n import java.io.InputStream;\n-import java.util.ArrayList;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n import java.util.List;\n import java.util.NoSuchElementException;\n-import java.util.Set;\n-import java.util.TreeSet;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n- String s = sc.next();\n- int K = sc.nextInt();\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n \n- Set set = new TreeSet<>();\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n \n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n+ }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ }\n+ }\n+ }\n+\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n }\n \n- List list = new ArrayList<>(set);\n-\n- System.out.println(list.get(K - 1));\n- }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n-}\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n try {\n- buflen = in.read(buffer);\n+ bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n- if (buflen <= 0) {\n- return false;\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n }\n }", "output": "FASTER 0.0272", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.019, "pair_id": "java_2060_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.IOException;\n import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n+import java.util.ArrayList;\n import java.util.List;\n import java.util.NoSuchElementException;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n+ FastScanner sc = new FastScanner();\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ }\n+\n+ List list = new ArrayList<>(set);\n+\n+ System.out.println(list.get(K - 1));\n }\n \n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n \n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n+ }\n+ return left;\n+ }\n \n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n- }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n+}\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n \n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n \n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }", "output": "SLOWER 0.0272", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.019, "pair_id": "java_2060_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.TreeSet;\n-import java.util.stream.Collectors;\n-import java.util.stream.IntStream;\n+import java.util.*;\n \n public class Main {\n- private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n-\n public static void main(String[] args) {\n- String s = scanner.next();\n- int k = scanner.nextInt(), n = s.length();\n- System.out.println(\n- new ArrayList<>(\n- IntStream.range(0, n)\n- .boxed()\n- .flatMap(\n- i ->\n- IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n- .mapToObj(j -> s.substring(i, j)))\n- .collect(Collectors.toCollection(TreeSet::new)))\n- .get(k - 1));\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ String[] part = new String[n * k];\n+ Arrays.fill(part, \"|\");\n+ int cnt = 0;\n+ for (int i = 1; i <= Math.min(k, n); i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ part[cnt] = s.substring(j, j + i);\n+ cnt++;\n+ }\n+ }\n+ Arrays.sort(part);\n+ int count = 0;\n+ String ans = \"\";\n+ for (int i = 0; i < n * k; i++) {\n+ if (!ans.equals(part[i])) {\n+ ans = part[i];\n+ count++;\n+ }\n+ if (count == k) break;\n+ }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.2021", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.1504, "pair_id": "java_547_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.TreeSet;\n+import java.util.stream.Collectors;\n+import java.util.stream.IntStream;\n \n public class Main {\n+ private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- String[] part = new String[n * k];\n- Arrays.fill(part, \"|\");\n- int cnt = 0;\n- for (int i = 1; i <= Math.min(k, n); i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- part[cnt] = s.substring(j, j + i);\n- cnt++;\n- }\n- }\n- Arrays.sort(part);\n- int count = 0;\n- String ans = \"\";\n- for (int i = 0; i < n * k; i++) {\n- if (!ans.equals(part[i])) {\n- ans = part[i];\n- count++;\n- }\n- if (count == k) break;\n- }\n- System.out.println(ans);\n+ String s = scanner.next();\n+ int k = scanner.nextInt(), n = s.length();\n+ System.out.println(\n+ new ArrayList<>(\n+ IntStream.range(0, n)\n+ .boxed()\n+ .flatMap(\n+ i ->\n+ IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n+ .mapToObj(j -> s.substring(i, j)))\n+ .collect(Collectors.toCollection(TreeSet::new)))\n+ .get(k - 1));\n }\n }", "output": "SLOWER 0.2021", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.1504, "pair_id": "java_547_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n \n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n+\n+ if (set.size() == 26) {\n+ break;\n+ }\n+ }\n+\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n break;\n }\n }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n- }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n }\n }\n- System.out.println(answer);\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 2.006", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 4.0167, "pair_id": "java_2089_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.stream.Collectors;\n \n public class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n \n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n-\n- if (set.size() == 26) {\n- break;\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n }\n- }\n-\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n break;\n }\n }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n+ }\n }\n }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 2.006", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 4.0167, "pair_id": "java_2089_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n import java.util.TreeSet;\n-import java.util.stream.Collectors;\n-import java.util.stream.IntStream;\n \n public class Main {\n- private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n \n public static void main(String[] args) {\n- String s = scanner.next();\n- int k = scanner.nextInt(), n = s.length();\n- System.out.println(\n- new ArrayList<>(\n- IntStream.range(0, n)\n- .boxed()\n- .flatMap(\n- i ->\n- IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n- .mapToObj(j -> s.substring(i, j)))\n- .collect(Collectors.toCollection(TreeSet::new)))\n- .get(k - 1));\n+ try (Scanner sc = new Scanner(System.in)) {\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+ for (char ch = 'a'; ch <= 'z'; ch++) {\n+ for (int i = 0; i < s.length(); i++) {\n+ if (s.charAt(i) == ch) {\n+ for (int j = 1; j <= 5; j++) {\n+ if (i + j <= s.length()) {\n+ set.add(s.substring(i, i + j));\n+ }\n+ }\n+ }\n+ }\n+\n+ if (set.size() >= k) {\n+ break;\n+ }\n+ }\n+\n+ List list = new ArrayList<>(set);\n+ String ans = list.get(k - 1);\n+\n+ System.out.println(ans);\n+ }\n }\n }", "output": "FASTER 0.6866", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6095, "pair_id": "java_541_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n import java.util.TreeSet;\n+import java.util.stream.Collectors;\n+import java.util.stream.IntStream;\n \n public class Main {\n+ private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n \n public static void main(String[] args) {\n- try (Scanner sc = new Scanner(System.in)) {\n- String s = sc.next();\n- int k = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n- for (char ch = 'a'; ch <= 'z'; ch++) {\n- for (int i = 0; i < s.length(); i++) {\n- if (s.charAt(i) == ch) {\n- for (int j = 1; j <= 5; j++) {\n- if (i + j <= s.length()) {\n- set.add(s.substring(i, i + j));\n- }\n- }\n- }\n- }\n-\n- if (set.size() >= k) {\n- break;\n- }\n- }\n-\n- List list = new ArrayList<>(set);\n- String ans = list.get(k - 1);\n-\n- System.out.println(ans);\n- }\n+ String s = scanner.next();\n+ int k = scanner.nextInt(), n = s.length();\n+ System.out.println(\n+ new ArrayList<>(\n+ IntStream.range(0, n)\n+ .boxed()\n+ .flatMap(\n+ i ->\n+ IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n+ .mapToObj(j -> s.substring(i, j)))\n+ .collect(Collectors.toCollection(TreeSet::new)))\n+ .get(k - 1));\n }\n }", "output": "SLOWER 0.6866", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6095, "pair_id": "java_541_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedHashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n-\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n-\n String s = sc.next();\n- int n = s.length();\n int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n+ List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n+ }\n }\n }\n-\n- Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n-\n- String[] array = set.toArray(new String[set.size()]);\n-\n- System.out.println(array[k - 1]);\n-\n- sc.close();\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 0.7192", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6463, "pair_id": "java_2092_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedHashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n- public static void main(String... args) {\n+\n+ public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n String s = sc.next();\n+ int n = s.length();\n int k = sc.nextInt();\n- List a = new ArrayList<>();\n+ List list = new ArrayList<>();\n+\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n- }\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+\n+ Collections.sort(list);\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n+\n+ String[] array = set.toArray(new String[set.size()]);\n+\n+ System.out.println(array[k - 1]);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.7192", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6463, "pair_id": "java_2092_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ try (Scanner sc = new Scanner(System.in)) {\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+ for (char ch = 'a'; ch <= 'z'; ch++) {\n+ for (int i = 0; i < s.length(); i++) {\n+ if (s.charAt(i) == ch) {\n+ for (int j = 1; j <= 5; j++) {\n+ if (i + j <= s.length()) {\n+ set.add(s.substring(i, i + j));\n+ }\n+ }\n+ }\n+ }\n+\n+ if (set.size() >= k) {\n+ break;\n+ }\n+ }\n+\n+ List list = new ArrayList<>(set);\n+ String ans = list.get(k - 1);\n+\n+ System.out.println(ans);\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.3796", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.301, "pair_id": "java_539_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n- try (Scanner sc = new Scanner(System.in)) {\n- String s = sc.next();\n- int k = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n- for (char ch = 'a'; ch <= 'z'; ch++) {\n- for (int i = 0; i < s.length(); i++) {\n- if (s.charAt(i) == ch) {\n- for (int j = 1; j <= 5; j++) {\n- if (i + j <= s.length()) {\n- set.add(s.substring(i, i + j));\n- }\n- }\n- }\n- }\n-\n- if (set.size() >= k) {\n- break;\n- }\n- }\n-\n- List list = new ArrayList<>(set);\n- String ans = list.get(k - 1);\n-\n- System.out.println(ans);\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.3796", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.301, "pair_id": "java_539_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n- public static void main(String args[]) {\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n-\n- TreeSet sub = new TreeSet();\n-\n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n }\n }\n }\n-\n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n- }\n- }\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 1.8886", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.7027, "pair_id": "java_2093_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n public class Main {\n- public static void main(String... args) {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n+\n+ TreeSet sub = new TreeSet();\n+\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n }\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n+ }\n+ }\n }\n }", "output": "SLOWER 1.8886", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.7027, "pair_id": "java_2093_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n \n public class Main {\n- public static void main(String... args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n+\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n+\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+ }\n+\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n }\n }", "output": "FASTER 0.7346", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6639, "pair_id": "java_2063_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n-\n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n- }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n-\n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n+ public static void main(String... args) {\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n- }\n-\n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n-\n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "SLOWER 0.7346", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6639, "pair_id": "java_2063_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n- public static void main(String args[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n \n- TreeSet sub = new TreeSet();\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n \n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n- }\n+ if (set.size() == 26) {\n+ break;\n }\n }\n \n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n break;\n }\n }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 1.8938", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.716, "pair_id": "java_2088_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n+ String s = sc.next();\n \n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n+ TreeSet sub = new TreeSet();\n \n- if (set.size() == 26) {\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n+ }\n+ }\n+ }\n+\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n break;\n }\n }\n-\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n }\n }", "output": "SLOWER 1.8938", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.716, "pair_id": "java_2088_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n+ String s = sc.next();\n int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n-\n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n- }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n- }\n- }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n- }\n- }\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n- System.out.println(answer);\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 1.9808", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.9471, "pair_id": "java_2098_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.stream.Collectors;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n+ String str = sc.nextLine();\n int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n+\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n+ }\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n+ }\n+ }\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n+ }\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 1.9808", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.9471, "pair_id": "java_2098_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n+ FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+\n+ Set set = new TreeSet<>();\n+\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n+\n+ List list = new ArrayList<>(set);\n+\n System.out.println(list.get(K - 1));\n }\n+\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n+\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n+ }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 0.7274", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6557, "pair_id": "java_2072_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n-import java.util.Set;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n+ Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n-\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n-\n- List list = new ArrayList<>(set);\n-\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n- }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 0.7274", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6557, "pair_id": "java_2072_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.1576", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.1154, "pair_id": "java_542_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n- }\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.1576", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.1154, "pair_id": "java_542_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n+import java.util.Set;\n import java.util.TreeSet;\n \n public class Main {\n- public static void main(String args[]) {\n- Scanner sc = new Scanner(System.in);\n+\n+ public static void main(String[] args) {\n+ FastScanner sc = new FastScanner();\n String s = sc.next();\n+ int K = sc.nextInt();\n \n- TreeSet sub = new TreeSet();\n+ Set set = new TreeSet<>();\n \n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n- }\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ }\n+\n+ List list = new ArrayList<>(set);\n+\n+ System.out.println(list.get(K - 1));\n+ }\n+\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n+\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n+ return left;\n+ }\n \n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 2.596", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 6.0461, "pair_id": "java_2075_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n-import java.util.Set;\n+import java.util.Scanner;\n import java.util.TreeSet;\n \n public class Main {\n+ public static void main(String args[]) {\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n \n- public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n- String s = sc.next();\n- int K = sc.nextInt();\n+ TreeSet sub = new TreeSet();\n \n- Set set = new TreeSet<>();\n-\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n+ }\n+ }\n }\n \n- List list = new ArrayList<>(set);\n-\n- System.out.println(list.get(K - 1));\n- }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n }\n }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 2.596", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 6.0461, "pair_id": "java_2075_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n- Set set = new HashSet<>();\n+ List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n+ }\n }\n }\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 0.0223", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0156, "pair_id": "java_2091_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n- public static void main(String... args) {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n- List a = new ArrayList<>();\n+ Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n- }\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "SLOWER 0.0223", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0156, "pair_id": "java_2091_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.TreeSet;\n-import java.util.stream.Collectors;\n-import java.util.stream.IntStream;\n+import java.util.*;\n \n public class Main {\n- private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n \n public static void main(String[] args) {\n- String s = scanner.next();\n- int k = scanner.nextInt(), n = s.length();\n- System.out.println(\n- new ArrayList<>(\n- IntStream.range(0, n)\n- .boxed()\n- .flatMap(\n- i ->\n- IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n- .mapToObj(j -> s.substring(i, j)))\n- .collect(Collectors.toCollection(TreeSet::new)))\n- .get(k - 1));\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.307", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.2371, "pair_id": "java_546_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.TreeSet;\n+import java.util.stream.Collectors;\n+import java.util.stream.IntStream;\n \n public class Main {\n+ private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n- }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ String s = scanner.next();\n+ int k = scanner.nextInt(), n = s.length();\n+ System.out.println(\n+ new ArrayList<>(\n+ IntStream.range(0, n)\n+ .boxed()\n+ .flatMap(\n+ i ->\n+ IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n+ .mapToObj(j -> s.substring(i, j)))\n+ .collect(Collectors.toCollection(TreeSet::new)))\n+ .get(k - 1));\n }\n }", "output": "SLOWER 0.307", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.2371, "pair_id": "java_546_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n- public static void main(String... args) {\n- Scanner sc = new Scanner(System.in);\n+\n+ public static void main(String[] args) {\n+ FastScanner sc = new FastScanner();\n String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n- }\n+ int K = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ }\n+\n+ List list = new ArrayList<>(set);\n+\n+ System.out.println(list.get(K - 1));\n+ }\n+\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n+\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+ return left;\n+ }\n+\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 0.7074", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6329, "pair_id": "java_2071_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n-import java.util.Set;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n+ public static void main(String... args) {\n+ Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n-\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n- }\n-\n- List list = new ArrayList<>(set);\n-\n- System.out.println(list.get(K - 1));\n- }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n+ }\n }\n }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 0.7074", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6329, "pair_id": "java_2071_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n import java.util.List;\n-import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.NoSuchElementException;\n \n public class Main {\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n+\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n+\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n }\n }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n- }\n+ ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n- System.out.println(answer);\n+ }\n+\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n }\n }", "output": "FASTER 2.7354", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 6.6596, "pair_id": "java_2068_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n+import java.util.HashSet;\n import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n+import java.util.stream.Collectors;\n \n public class Main {\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ Scanner sc = new Scanner(System.in);\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n \n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n-\n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n-\n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n- }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n }\n }\n- ans = next.subList(0, Math.min(k, next.size()));\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n+ }\n }\n }\n- }\n-\n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n-\n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 2.7354", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 6.6596, "pair_id": "java_2068_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n+ FastScanner sc = new FastScanner();\n+ String s = sc.next();\n+ int K = sc.nextInt();\n \n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n+ Set set = new TreeSet<>();\n \n- if (set.size() == 26) {\n- break;\n- }\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n \n List list = new ArrayList<>(set);\n- Collections.sort(list);\n \n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n+ System.out.println(list.get(K - 1));\n+ }\n \n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n \n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n+ return left;\n+ }\n \n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 0.7022", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.627, "pair_id": "java_2070_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n-import java.util.Set;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n \n- public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n- String s = sc.next();\n- int K = sc.nextInt();\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n \n- Set set = new TreeSet<>();\n-\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ if (set.size() == 26) {\n+ break;\n+ }\n }\n \n List list = new ArrayList<>(set);\n+ Collections.sort(list);\n \n- System.out.println(list.get(K - 1));\n- }\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n \n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n \n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n }\n }\n- return left;\n- }\n \n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 0.7022", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.627, "pair_id": "java_2070_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedHashSet;\n import java.util.List;\n import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.Set;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n \n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n- }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n- }\n- }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n- }\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ List list = new ArrayList<>();\n+\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n- System.out.println(answer);\n+\n+ Collections.sort(list);\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n+\n+ String[] array = set.toArray(new String[set.size()]);\n+\n+ System.out.println(array[k - 1]);\n+\n+ sc.close();\n }\n }", "output": "FASTER 1.2816", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 2.4311, "pair_id": "java_2103_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedHashSet;\n+import java.util.HashSet;\n import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n+import java.util.stream.Collectors;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n+ }\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n+ }\n+ }\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n+ }\n }\n }\n-\n- Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n-\n- String[] array = set.toArray(new String[set.size()]);\n-\n- System.out.println(array[k - 1]);\n-\n- sc.close();\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 1.2816", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 2.4311, "pair_id": "java_2103_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) {\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n+ }\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 0.0201", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.014, "pair_id": "java_2090_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String... args) {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n- }\n- }\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.0201", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.014, "pair_id": "java_2090_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedHashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n- }\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n-\n+ List list = new ArrayList<>(S);\n Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n-\n- String[] array = set.toArray(new String[set.size()]);\n-\n- System.out.println(array[k - 1]);\n-\n- sc.close();\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.6992", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6236, "pair_id": "java_2096_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedHashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n \n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ List list = new ArrayList<>();\n+\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n+ }\n }\n- List list = new ArrayList<>(S);\n+\n Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n+\n+ String[] array = set.toArray(new String[set.size()]);\n+\n+ System.out.println(array[k - 1]);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.6992", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6236, "pair_id": "java_2096_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- String[] part = new String[n * k];\n- Arrays.fill(part, \"|\");\n- int cnt = 0;\n- for (int i = 1; i <= Math.min(k, n); i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- part[cnt] = s.substring(j, j + i);\n- cnt++;\n+ try (Scanner sc = new Scanner(System.in)) {\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+ for (char ch = 'a'; ch <= 'z'; ch++) {\n+ for (int i = 0; i < s.length(); i++) {\n+ if (s.charAt(i) == ch) {\n+ for (int j = 1; j <= 5; j++) {\n+ if (i + j <= s.length()) {\n+ set.add(s.substring(i, i + j));\n+ }\n+ }\n+ }\n+ }\n+\n+ if (set.size() >= k) {\n+ break;\n+ }\n }\n+\n+ List list = new ArrayList<>(set);\n+ String ans = list.get(k - 1);\n+\n+ System.out.println(ans);\n }\n- Arrays.sort(part);\n- int count = 0;\n- String ans = \"\";\n- for (int i = 0; i < n * k; i++) {\n- if (!ans.equals(part[i])) {\n- ans = part[i];\n- count++;\n- }\n- if (count == k) break;\n- }\n- System.out.println(ans);\n }\n }", "output": "FASTER 0.4845", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.3991, "pair_id": "java_540_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n- try (Scanner sc = new Scanner(System.in)) {\n- String s = sc.next();\n- int k = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n- for (char ch = 'a'; ch <= 'z'; ch++) {\n- for (int i = 0; i < s.length(); i++) {\n- if (s.charAt(i) == ch) {\n- for (int j = 1; j <= 5; j++) {\n- if (i + j <= s.length()) {\n- set.add(s.substring(i, i + j));\n- }\n- }\n- }\n- }\n-\n- if (set.size() >= k) {\n- break;\n- }\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ String[] part = new String[n * k];\n+ Arrays.fill(part, \"|\");\n+ int cnt = 0;\n+ for (int i = 1; i <= Math.min(k, n); i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ part[cnt] = s.substring(j, j + i);\n+ cnt++;\n }\n-\n- List list = new ArrayList<>(set);\n- String ans = list.get(k - 1);\n-\n- System.out.println(ans);\n }\n+ Arrays.sort(part);\n+ int count = 0;\n+ String ans = \"\";\n+ for (int i = 0; i < n * k; i++) {\n+ if (!ans.equals(part[i])) {\n+ ans = part[i];\n+ count++;\n+ }\n+ if (count == k) break;\n+ }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.4845", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.3991, "pair_id": "java_540_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedHashSet;\n-import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n \n- Scanner sc = new Scanner(System.in);\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n \n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- List list = new ArrayList<>();\n+ if (s.length() == 1) {\n+ System.out.println(s);\n \n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n }\n }\n-\n- Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n-\n- String[] array = set.toArray(new String[set.size()]);\n-\n- System.out.println(array[k - 1]);\n-\n- sc.close();\n }\n }", "output": "FASTER 0.7672", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.702, "pair_id": "java_2081_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedHashSet;\n+import java.util.List;\n import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.Set;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n \n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n+ Scanner sc = new Scanner(System.in);\n \n- if (s.length() == 1) {\n- System.out.println(s);\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ List list = new ArrayList<>();\n \n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n+\n+ Collections.sort(list);\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n+\n+ String[] array = set.toArray(new String[set.size()]);\n+\n+ System.out.println(array[k - 1]);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.7672", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.702, "pair_id": "java_2081_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n \n-class Main {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n \n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n \n- if (s.length() == 1) {\n- System.out.println(s);\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n+ }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ }\n+ }\n+ }\n \n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+ b = readByte();\n }\n }\n }\n }", "output": "FASTER 0.6866", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6095, "pair_id": "java_2061_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n \n- List ans = new LinkedList<>();\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n-\n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n- }\n- }\n- }\n-\n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n-\n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n+ c++;\n }\n }\n }\n }", "output": "SLOWER 0.6866", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6095, "pair_id": "java_2061_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n+\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n+\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n+ }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ }\n+\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n }\n }", "output": "FASTER 0.7546", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6872, "pair_id": "java_2064_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n-\n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n- }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n-\n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n- }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n- }\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n- }\n-\n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n-\n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.7546", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6872, "pair_id": "java_2064_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- String[] part = new String[n * k];\n- Arrays.fill(part, \"|\");\n- int cnt = 0;\n- for (int i = 1; i <= Math.min(k, n); i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- part[cnt] = s.substring(j, j + i);\n- cnt++;\n- }\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n- Arrays.sort(part);\n- int count = 0;\n- String ans = \"\";\n- for (int i = 0; i < n * k; i++) {\n- if (!ans.equals(part[i])) {\n- ans = part[i];\n- count++;\n- }\n- if (count == k) break;\n- }\n- System.out.println(ans);\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.1049", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0754, "pair_id": "java_545_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ String[] part = new String[n * k];\n+ Arrays.fill(part, \"|\");\n+ int cnt = 0;\n+ for (int i = 1; i <= Math.min(k, n); i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ part[cnt] = s.substring(j, j + i);\n+ cnt++;\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ Arrays.sort(part);\n+ int count = 0;\n+ String ans = \"\";\n+ for (int i = 0; i < n * k; i++) {\n+ if (!ans.equals(part[i])) {\n+ ans = part[i];\n+ count++;\n+ }\n+ if (count == k) break;\n+ }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.1049", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0754, "pair_id": "java_545_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n-import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n }\n }\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n- System.out.println(list.get(k - 1));\n }\n }", "output": "FASTER 0.0703", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0499, "pair_id": "java_2080_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n+import java.util.List;\n import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.Set;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ Set set = new HashSet<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "SLOWER 0.0703", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0499, "pair_id": "java_2080_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n- public static void main(String... args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n+class Main {\n+\n+ public static void main(String[] args) {\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n }\n }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n+ }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 0.048", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0338, "pair_id": "java_2078_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n-class Main {\n-\n- public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n+public class Main {\n+ public static void main(String... args) {\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n }\n }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n- }\n }\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "SLOWER 0.048", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0338, "pair_id": "java_2078_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n+import java.util.List;\n import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.Set;\n \n public class Main {\n- public static void main(String args[]) {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n-\n- TreeSet sub = new TreeSet();\n-\n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n- }\n+ int k = sc.nextInt();\n+ Set set = new HashSet<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n-\n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n- }\n- }\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "FASTER 1.8663", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.6459, "pair_id": "java_2100_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n-import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n-\n- public static void main(String[] args) {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int k = sc.nextInt();\n- Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+\n+ TreeSet sub = new TreeSet();\n+\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n+ }\n }\n }\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n+ }\n+ }\n }\n }", "output": "SLOWER 1.8663", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.6459, "pair_id": "java_2100_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n import java.util.List;\n-import java.util.Scanner;\n+import java.util.NoSuchElementException;\n import java.util.Set;\n+import java.util.TreeSet;\n \n public class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n+ FastScanner sc = new FastScanner();\n String s = sc.next();\n- int k = sc.nextInt();\n- Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+ int K = sc.nextInt();\n+\n+ Set set = new TreeSet<>();\n+\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ }\n+\n+ List list = new ArrayList<>(set);\n+\n+ System.out.println(list.get(K - 1));\n+ }\n+\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n+\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+ return left;\n+ }\n+\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 0.7297", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6583, "pair_id": "java_2073_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n import java.util.Set;\n-import java.util.TreeSet;\n \n public class Main {\n \n public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n+ Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n-\n- Set set = new TreeSet<>();\n-\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n- }\n-\n- List list = new ArrayList<>(set);\n-\n- System.out.println(list.get(K - 1));\n- }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n+ int k = sc.nextInt();\n+ Set set = new HashSet<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+ System.out.println(list.get(k - 1));\n }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 0.7297", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6583, "pair_id": "java_2073_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n+import java.util.Set;\n import java.util.TreeSet;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n+ FastScanner sc = new FastScanner();\n+ String s = sc.next();\n+ int K = sc.nextInt();\n \n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n+ Set set = new TreeSet<>();\n \n- if (s.length() == 1) {\n- System.out.println(s);\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n+ }\n \n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+ List list = new ArrayList<>(set);\n+\n+ System.out.println(list.get(K - 1));\n+ }\n+\n+ public static int fact(int n) {\n+ if (n == 1 || n == 0) return 1;\n+ else return n * fact(n - 1);\n+ }\n+\n+ public static long lowerBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] < y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n }\n }\n+ return left;\n+ }\n+\n+ public static long upperBound(int n, long[] x, long y) {\n+ int left = 0;\n+ int right = n;\n+ while (left < right) {\n+ int mid = (left + right) / 2;\n+ if (x[mid] <= y) {\n+ left = mid + 1;\n+ } else {\n+ right = mid;\n+ }\n+ }\n+ return left;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (a < b) return gcd(b, a);\n+ long c = 0;\n+ c = a % b;\n+ if (c == 0) return b;\n+ return gcd(b, c);\n+ }\n+\n+ public static long lcm(long m, long n) {\n+ return m * n / gcd(m, n);\n+ }\n+\n+ public static boolean isPrime(int n) {\n+ if (n < 2) return false;\n+ if (n == 2) return true;\n+ if (n % 2 == 0) return false;\n+\n+ for (int i = 3; i * i <= n; i += 2) {\n+ if (n % i == 0) return false;\n+ }\n+ return true;\n }\n }\n+\n+class FastScanner {\n+ private final InputStream in = System.in;\n+ private final byte[] buffer = new byte[1024];\n+ private int ptr = 0;\n+ private int buflen = 0;\n+\n+ private boolean hasNextByte() {\n+ if (ptr < buflen) {\n+ return true;\n+ } else {\n+ ptr = 0;\n+ try {\n+ buflen = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (buflen <= 0) {\n+ return false;\n+ }\n+ }\n+ return true;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[ptr++];\n+ else return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || '9' < b) {\n+ throw new NumberFormatException();\n+ }\n+ while (true) {\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n+ }\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+}", "output": "FASTER 0.6594", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.5794, "pair_id": "java_2069_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n FastScanner sc = new FastScanner();\n String s = sc.next();\n int K = sc.nextInt();\n\n Set set = new TreeSet<>();\n\n for (int i = 0; i < s.length(); i++) {\n for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n }\n\n List list = new ArrayList<>(set);\n\n System.out.println(list.get(K - 1));\n }\n\n public static int fact(int n) {\n if (n == 1 || n == 0) return 1;\n else return n * fact(n - 1);\n }\n\n public static long lowerBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] < y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long upperBound(int n, long[] x, long y) {\n int left = 0;\n int right = n;\n while (left < right) {\n int mid = (left + right) / 2;\n if (x[mid] <= y) {\n left = mid + 1;\n } else {\n right = mid;\n }\n }\n return left;\n }\n\n public static long gcd(long a, long b) {\n if (a < b) return gcd(b, a);\n long c = 0;\n c = a % b;\n if (c == 0) return b;\n return gcd(b, c);\n }\n\n public static long lcm(long m, long n) {\n return m * n / gcd(m, n);\n }\n\n public static boolean isPrime(int n) {\n if (n < 2) return false;\n if (n == 2) return true;\n if (n % 2 == 0) return false;\n\n for (int i = 3; i * i <= n; i += 2) {\n if (n % i == 0) return false;\n }\n return true;\n }\n}\n\nclass FastScanner {\n private final InputStream in = System.in;\n private final byte[] buffer = new byte[1024];\n private int ptr = 0;\n private int buflen = 0;\n\n private boolean hasNextByte() {\n if (ptr < buflen) {\n return true;\n } else {\n ptr = 0;\n try {\n buflen = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (buflen <= 0) {\n return false;\n }\n }\n return true;\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[ptr++];\n else return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || '9' < b) {\n throw new NumberFormatException();\n }\n while (true) {\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n-import java.util.Set;\n+import java.util.Scanner;\n import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n- FastScanner sc = new FastScanner();\n- String s = sc.next();\n- int K = sc.nextInt();\n \n- Set set = new TreeSet<>();\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n \n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i; j < s.length() && j - i + 1 <= K; j++) set.add(s.substring(i, j + 1));\n- }\n+ if (s.length() == 1) {\n+ System.out.println(s);\n \n- List list = new ArrayList<>(set);\n-\n- System.out.println(list.get(K - 1));\n- }\n-\n- public static int fact(int n) {\n- if (n == 1 || n == 0) return 1;\n- else return n * fact(n - 1);\n- }\n-\n- public static long lowerBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] < y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n }\n }\n- return left;\n- }\n-\n- public static long upperBound(int n, long[] x, long y) {\n- int left = 0;\n- int right = n;\n- while (left < right) {\n- int mid = (left + right) / 2;\n- if (x[mid] <= y) {\n- left = mid + 1;\n- } else {\n- right = mid;\n- }\n- }\n- return left;\n- }\n-\n- public static long gcd(long a, long b) {\n- if (a < b) return gcd(b, a);\n- long c = 0;\n- c = a % b;\n- if (c == 0) return b;\n- return gcd(b, c);\n- }\n-\n- public static long lcm(long m, long n) {\n- return m * n / gcd(m, n);\n- }\n-\n- public static boolean isPrime(int n) {\n- if (n < 2) return false;\n- if (n == 2) return true;\n- if (n % 2 == 0) return false;\n-\n- for (int i = 3; i * i <= n; i += 2) {\n- if (n % i == 0) return false;\n- }\n- return true;\n }\n }\n-\n-class FastScanner {\n- private final InputStream in = System.in;\n- private final byte[] buffer = new byte[1024];\n- private int ptr = 0;\n- private int buflen = 0;\n-\n- private boolean hasNextByte() {\n- if (ptr < buflen) {\n- return true;\n- } else {\n- ptr = 0;\n- try {\n- buflen = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (buflen <= 0) {\n- return false;\n- }\n- }\n- return true;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[ptr++];\n- else return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || '9' < b) {\n- throw new NumberFormatException();\n- }\n- while (true) {\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n- }\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-}", "output": "SLOWER 0.6594", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.5794, "pair_id": "java_2069_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedHashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n \n- public static void main(String[] args) {\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n \n- Scanner sc = new Scanner(System.in);\n-\n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ if (set.size() == 26) {\n+ break;\n }\n }\n \n+ List list = new ArrayList<>(set);\n Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n \n- String[] array = set.toArray(new String[set.size()]);\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n \n- System.out.println(array[k - 1]);\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n \n- sc.close();\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n+ }\n+ }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 0.7244", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.6522, "pair_id": "java_2087_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedHashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n+\n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n \n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ List list = new ArrayList<>();\n \n- if (set.size() == 26) {\n- break;\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n \n- List list = new ArrayList<>(set);\n Collections.sort(list);\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n \n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n+ String[] array = set.toArray(new String[set.size()]);\n \n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n+ System.out.println(array[k - 1]);\n \n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ sc.close();\n }\n }", "output": "SLOWER 0.7244", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.6522, "pair_id": "java_2087_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n public class Main {\n- public static void main(String args[]) {\n+\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n-\n- TreeSet sub = new TreeSet();\n-\n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n- }\n- }\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n-\n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n- }\n- }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 1.8685", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.6516, "pair_id": "java_2097_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n public class Main {\n-\n- public static void main(String[] args) {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+\n+ TreeSet sub = new TreeSet();\n+\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n+ }\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n+ }\n+ }\n }\n }", "output": "SLOWER 1.8685", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.6516, "pair_id": "java_2097_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n+import java.util.Scanner;\n import java.util.TreeSet;\n-import java.util.stream.Collectors;\n-import java.util.stream.IntStream;\n \n-public class Main {\n- private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n+class Main {\n \n public static void main(String[] args) {\n- String s = scanner.next();\n- int k = scanner.nextInt(), n = s.length();\n- System.out.println(\n- new ArrayList<>(\n- IntStream.range(0, n)\n- .boxed()\n- .flatMap(\n- i ->\n- IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n- .mapToObj(j -> s.substring(i, j)))\n- .collect(Collectors.toCollection(TreeSet::new)))\n- .get(k - 1));\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n+ }\n+ }\n }\n }", "output": "FASTER 0.4645", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.3798, "pair_id": "java_544_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.TreeSet;\nimport java.util.stream.Collectors;\nimport java.util.stream.IntStream;\n\npublic class Main {\n private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n\n public static void main(String[] args) {\n String s = scanner.next();\n int k = scanner.nextInt(), n = s.length();\n System.out.println(\n new ArrayList<>(\n IntStream.range(0, n)\n .boxed()\n .flatMap(\n i ->\n IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n .mapToObj(j -> s.substring(i, j)))\n .collect(Collectors.toCollection(TreeSet::new)))\n .get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.ArrayList;\n import java.util.TreeSet;\n+import java.util.stream.Collectors;\n+import java.util.stream.IntStream;\n \n-class Main {\n+public class Main {\n+ private static java.util.Scanner scanner = new java.util.Scanner(System.in);\n \n public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n- }\n- }\n+ String s = scanner.next();\n+ int k = scanner.nextInt(), n = s.length();\n+ System.out.println(\n+ new ArrayList<>(\n+ IntStream.range(0, n)\n+ .boxed()\n+ .flatMap(\n+ i ->\n+ IntStream.rangeClosed(i + 1, Math.min(i + k, n))\n+ .mapToObj(j -> s.substring(i, j)))\n+ .collect(Collectors.toCollection(TreeSet::new)))\n+ .get(k - 1));\n }\n }", "output": "SLOWER 0.4645", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.3798, "pair_id": "java_544_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n+\n+ if (set.size() == 26) {\n+ break;\n }\n }\n+\n List list = new ArrayList<>(set);\n Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n+ }\n+ }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 0.0274", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0192, "pair_id": "java_2086_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n+ String s = sc.next();\n+ int k = sc.nextInt();\n Set set = new HashSet<>();\n-\n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n-\n- if (set.size() == 26) {\n- break;\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n-\n List list = new ArrayList<>(set);\n Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "SLOWER 0.0274", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0192, "pair_id": "java_2086_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n+ }\n }\n- List list = new ArrayList<>(S);\n- Collections.sort(list);\n- System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.0681", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0483, "pair_id": "java_2079_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n- }\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n+ List list = new ArrayList<>(S);\n+ Collections.sort(list);\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.0681", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0483, "pair_id": "java_2079_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int n = s.length();\n- int k = sc.nextInt();\n- String[] part = new String[n * k];\n- Arrays.fill(part, \"|\");\n- int cnt = 0;\n- for (int i = 1; i <= Math.min(k, n); i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- part[cnt] = s.substring(j, j + i);\n- cnt++;\n+\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n }\n }\n- Arrays.sort(part);\n- int count = 0;\n- String ans = \"\";\n- for (int i = 0; i < n * k; i++) {\n- if (!ans.equals(part[i])) {\n- ans = part[i];\n- count++;\n- }\n- if (count == k) break;\n- }\n- System.out.println(ans);\n }\n }", "output": "FASTER 0.2624", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.1995, "pair_id": "java_543_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n String[] part = new String[n * k];\n Arrays.fill(part, \"|\");\n int cnt = 0;\n for (int i = 1; i <= Math.min(k, n); i++) {\n for (int j = 0; j < n - i + 1; j++) {\n part[cnt] = s.substring(j, j + i);\n cnt++;\n }\n }\n Arrays.sort(part);\n int count = 0;\n String ans = \"\";\n for (int i = 0; i < n * k; i++) {\n if (!ans.equals(part[i])) {\n ans = part[i];\n count++;\n }\n if (count == k) break;\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n-class Main {\n-\n+public class Main {\n public static void main(String[] args) {\n-\n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n-\n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n- }\n- }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n+ int n = s.length();\n+ int k = sc.nextInt();\n+ String[] part = new String[n * k];\n+ Arrays.fill(part, \"|\");\n+ int cnt = 0;\n+ for (int i = 1; i <= Math.min(k, n); i++) {\n+ for (int j = 0; j < n - i + 1; j++) {\n+ part[cnt] = s.substring(j, j + i);\n+ cnt++;\n }\n }\n+ Arrays.sort(part);\n+ int count = 0;\n+ String ans = \"\";\n+ for (int i = 0; i < n * k; i++) {\n+ if (!ans.equals(part[i])) {\n+ ans = part[i];\n+ count++;\n+ }\n+ if (count == k) break;\n+ }\n+ System.out.println(ans);\n }\n }", "output": "SLOWER 0.2624", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.1995, "pair_id": "java_543_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n+\n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n \n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n \n- if (set.size() == 26) {\n- break;\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n+ }\n+ list.add(s.substring(i, j));\n+ }\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n+ break;\n+ }\n+ c++;\n }\n }\n-\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 0.0428", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0301, "pair_id": "java_2077_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.*;\n \n-class Main {\n+public class Main {\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n \n- public static void main(String[] args) {\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n \n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n+ if (set.size() == 26) {\n+ break;\n+ }\n+ }\n \n- if (s.length() == 1) {\n- System.out.println(s);\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n \n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n break;\n }\n- list.add(s.substring(i, j));\n }\n+ pos++;\n }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n+\n+ if (ans.size() > ans2) {\n+ break;\n }\n }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "SLOWER 0.0428", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0301, "pair_id": "java_2077_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String... args) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n- }\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n+\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n+\n+ if (set.size() == 26) {\n+ break;\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n+ }\n+ }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 0.0052", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0036, "pair_id": "java_2084_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n-\n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n-\n- if (set.size() == 26) {\n- break;\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n+ }\n }\n }\n-\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "SLOWER 0.0052", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0036, "pair_id": "java_2084_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n+import java.util.Set;\n import java.util.TreeSet;\n \n-class Main {\n+public class Main {\n \n public static void main(String[] args) {\n+ try (Scanner sc = new Scanner(System.in)) {\n+ String s = sc.next();\n+ int k = sc.nextInt();\n \n- Scanner scan = new Scanner(System.in);\n- String s = scan.next();\n- int x = scan.nextInt();\n- TreeSet list = new TreeSet();\n+ Set set = new TreeSet<>();\n+ for (char ch = 'a'; ch <= 'z'; ch++) {\n+ for (int i = 0; i < s.length(); i++) {\n+ if (s.charAt(i) == ch) {\n+ for (int j = 1; j <= 5; j++) {\n+ if (i + j <= s.length()) {\n+ set.add(s.substring(i, i + j));\n+ }\n+ }\n+ }\n+ }\n \n- if (s.length() == 1) {\n- System.out.println(s);\n-\n- } else {\n- for (int i = 0; i < s.length(); i++) {\n- for (int j = i + 1; j <= s.length(); j++) {\n- if (j - i > 6) {\n- break;\n- }\n- list.add(s.substring(i, j));\n+ if (set.size() >= k) {\n+ break;\n }\n }\n- int c = 0;\n- for (String a : list) {\n- if (c == x - 1) {\n- System.out.println(a);\n- break;\n- }\n- c++;\n- }\n+\n+ List list = new ArrayList<>(set);\n+ String ans = list.get(k - 1);\n+\n+ System.out.println(ans);\n }\n }\n }", "output": "FASTER 0.2222", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.1665, "pair_id": "java_538_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\nimport java.util.TreeSet;\n\npublic class Main {\n\n public static void main(String[] args) {\n try (Scanner sc = new Scanner(System.in)) {\n String s = sc.next();\n int k = sc.nextInt();\n\n Set set = new TreeSet<>();\n for (char ch = 'a'; ch <= 'z'; ch++) {\n for (int i = 0; i < s.length(); i++) {\n if (s.charAt(i) == ch) {\n for (int j = 1; j <= 5; j++) {\n if (i + j <= s.length()) {\n set.add(s.substring(i, i + j));\n }\n }\n }\n }\n\n if (set.size() >= k) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n String ans = list.get(k - 1);\n\n System.out.println(ans);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\nclass Main {\n\n public static void main(String[] args) {\n\n Scanner scan = new Scanner(System.in);\n String s = scan.next();\n int x = scan.nextInt();\n TreeSet list = new TreeSet();\n\n if (s.length() == 1) {\n System.out.println(s);\n\n } else {\n for (int i = 0; i < s.length(); i++) {\n for (int j = i + 1; j <= s.length(); j++) {\n if (j - i > 6) {\n break;\n }\n list.add(s.substring(i, j));\n }\n }\n int c = 0;\n for (String a : list) {\n if (c == x - 1) {\n System.out.println(a);\n break;\n }\n c++;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n import java.util.TreeSet;\n \n-public class Main {\n+class Main {\n \n public static void main(String[] args) {\n- try (Scanner sc = new Scanner(System.in)) {\n- String s = sc.next();\n- int k = sc.nextInt();\n \n- Set set = new TreeSet<>();\n- for (char ch = 'a'; ch <= 'z'; ch++) {\n- for (int i = 0; i < s.length(); i++) {\n- if (s.charAt(i) == ch) {\n- for (int j = 1; j <= 5; j++) {\n- if (i + j <= s.length()) {\n- set.add(s.substring(i, i + j));\n- }\n- }\n+ Scanner scan = new Scanner(System.in);\n+ String s = scan.next();\n+ int x = scan.nextInt();\n+ TreeSet list = new TreeSet();\n+\n+ if (s.length() == 1) {\n+ System.out.println(s);\n+\n+ } else {\n+ for (int i = 0; i < s.length(); i++) {\n+ for (int j = i + 1; j <= s.length(); j++) {\n+ if (j - i > 6) {\n+ break;\n }\n+ list.add(s.substring(i, j));\n }\n-\n- if (set.size() >= k) {\n+ }\n+ int c = 0;\n+ for (String a : list) {\n+ if (c == x - 1) {\n+ System.out.println(a);\n break;\n }\n+ c++;\n }\n-\n- List list = new ArrayList<>(set);\n- String ans = list.get(k - 1);\n-\n- System.out.println(ans);\n }\n }\n }", "output": "SLOWER 0.2222", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.1665, "pair_id": "java_538_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.ArrayList;\n+import java.util.Collections;\n import java.util.HashSet;\n import java.util.List;\n import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.Set;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n-\n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n- }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n- }\n- }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n- }\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ Set set = new HashSet<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n- System.out.println(answer);\n+ List list = new ArrayList<>(set);\n+ Collections.sort(list);\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "FASTER 1.9785", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 3.9409, "pair_id": "java_2101_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n import java.util.HashSet;\n import java.util.List;\n import java.util.Scanner;\n-import java.util.Set;\n+import java.util.stream.Collectors;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n+\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n+ }\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n+ }\n+ }\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n+ }\n }\n }\n- List list = new ArrayList<>(set);\n- Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 1.9785", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 3.9409, "pair_id": "java_2101_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.List;\n import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.TreeSet;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n+ String s = sc.next();\n \n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n- }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n- }\n- }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n+ TreeSet sub = new TreeSet();\n+\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n }\n }\n }\n- System.out.println(answer);\n+\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n+ }\n+ }\n }\n }", "output": "FASTER 0.1122", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0809, "pair_id": "java_2104_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.util.HashSet;\n+import java.util.List;\n import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.util.stream.Collectors;\n \n public class Main {\n- public static void main(String args[]) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n \n- TreeSet sub = new TreeSet();\n-\n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n+ }\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n+ }\n+ }\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n }\n }\n }\n-\n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n- }\n- }\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 0.1122", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0809, "pair_id": "java_2104_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n-\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ String str = sc.next();\n+ int ans2 = sc.nextInt();\n+ Set set = new HashSet<>();\n+\n+ for (int i = 0; i < str.length(); i++) {\n+ set.add(String.valueOf(str.charAt(i)));\n+\n+ if (set.size() == 26) {\n+ break;\n+ }\n }\n- List list = new ArrayList<>(S);\n+\n+ List list = new ArrayList<>(set);\n Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+\n+ Set ans = new HashSet<>();\n+ int pos = 0;\n+ for (int i = 0; i < set.size(); i++) {\n+ while (true) {\n+ pos = str.indexOf(list.get(i), pos);\n+ if (pos == -1) {\n+ break;\n+ }\n+\n+ int count = 0;\n+ for (int k = pos; k < str.length(); k++) {\n+ ans.add(str.substring(pos, k + 1));\n+\n+ if (count++ == 10) {\n+ break;\n+ }\n+ }\n+ pos++;\n+ }\n+\n+ if (ans.size() > ans2) {\n+ break;\n+ }\n+ }\n+\n+ list = new ArrayList<>(ans);\n+ Collections.sort(list);\n+ System.out.println(list.get(ans2 - 1));\n }\n }", "output": "FASTER 0.0252", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0176, "pair_id": "java_2085_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.next();\n int ans2 = sc.nextInt();\n Set set = new HashSet<>();\n\n for (int i = 0; i < str.length(); i++) {\n set.add(String.valueOf(str.charAt(i)));\n\n if (set.size() == 26) {\n break;\n }\n }\n\n List list = new ArrayList<>(set);\n Collections.sort(list);\n\n Set ans = new HashSet<>();\n int pos = 0;\n for (int i = 0; i < set.size(); i++) {\n while (true) {\n pos = str.indexOf(list.get(i), pos);\n if (pos == -1) {\n break;\n }\n\n int count = 0;\n for (int k = pos; k < str.length(); k++) {\n ans.add(str.substring(pos, k + 1));\n\n if (count++ == 10) {\n break;\n }\n }\n pos++;\n }\n\n if (ans.size() > ans2) {\n break;\n }\n }\n\n list = new ArrayList<>(ans);\n Collections.sort(list);\n System.out.println(list.get(ans2 - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.next();\n- int ans2 = sc.nextInt();\n- Set set = new HashSet<>();\n-\n- for (int i = 0; i < str.length(); i++) {\n- set.add(String.valueOf(str.charAt(i)));\n-\n- if (set.size() == 26) {\n- break;\n- }\n+ String s = sc.next();\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n-\n- List list = new ArrayList<>(set);\n+ List list = new ArrayList<>(S);\n Collections.sort(list);\n-\n- Set ans = new HashSet<>();\n- int pos = 0;\n- for (int i = 0; i < set.size(); i++) {\n- while (true) {\n- pos = str.indexOf(list.get(i), pos);\n- if (pos == -1) {\n- break;\n- }\n-\n- int count = 0;\n- for (int k = pos; k < str.length(); k++) {\n- ans.add(str.substring(pos, k + 1));\n-\n- if (count++ == 10) {\n- break;\n- }\n- }\n- pos++;\n- }\n-\n- if (ans.size() > ans2) {\n- break;\n- }\n- }\n-\n- list = new ArrayList<>(ans);\n- Collections.sort(list);\n- System.out.println(list.get(ans2 - 1));\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "SLOWER 0.0252", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0176, "pair_id": "java_2085_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.Set;\n+import java.util.*;\n \n public class Main {\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int k = sc.nextInt();\n- Set set = new HashSet<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n- }\n+ int K = sc.nextInt();\n+ Set S = new HashSet<>();\n+ for (int i = 0; i < K; i++) {\n+ for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n- List list = new ArrayList<>(set);\n+ List list = new ArrayList<>(S);\n Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+ System.out.println(list.get(K - 1));\n }\n }", "output": "FASTER 0.0023", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.0016, "pair_id": "java_2095_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int K = sc.nextInt();\n Set S = new HashSet<>();\n for (int i = 0; i < K; i++) {\n for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n }\n List list = new ArrayList<>(S);\n Collections.sort(list);\n System.out.println(list.get(K - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.Set;\n \n public class Main {\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n- int K = sc.nextInt();\n- Set S = new HashSet<>();\n- for (int i = 0; i < K; i++) {\n- for (int j = 0; j < s.length() - i; j++) S.add(s.substring(j, j + i + 1));\n+ int k = sc.nextInt();\n+ Set set = new HashSet<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n+ }\n }\n- List list = new ArrayList<>(S);\n+ List list = new ArrayList<>(set);\n Collections.sort(list);\n- System.out.println(list.get(K - 1));\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "SLOWER 0.0023", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.0016, "pair_id": "java_2095_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.HashSet;\n-import java.util.List;\n-import java.util.Scanner;\n-import java.util.stream.Collectors;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n+ public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n- String str = sc.nextLine();\n- int K = sc.nextInt();\n- char[] alpha = {\n- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n- 't', 'u', 'v', 'w', 'x', 'y', 'z'\n- };\n- int count = 0;\n- String answer = new String();\n-\n- for (int i = 0; i < alpha.length; i++) {\n- char c = alpha[i];\n- int[] idx_tmp = new int[5000];\n- int[] idx;\n- int idxidx = 0;\n- boolean nozero_flag = false;\n- for (int j = 0; j < str.length(); j++) {\n- if (c == str.charAt(j)) {\n- idx_tmp[idxidx] = j;\n- idxidx++;\n- nozero_flag = true;\n- }\n- }\n- idx = new int[idxidx];\n- if (nozero_flag) {\n- HashSet substr = new HashSet<>();\n- idx[0] = idx_tmp[0];\n- for (int l = 1; l < idxidx; l++) {\n- if (idx_tmp[l] != 0) {\n- idx[l] = idx_tmp[l];\n- } else {\n- break;\n- }\n- }\n- for (int j = 0; j < idx.length; j++) {\n- int index = idx[j];\n- for (int k = 0; k < K; k++) {\n- if (index + k < str.length()) {\n- substr.add(str.substring(index, index + k + 1));\n- }\n- }\n- }\n- int prev_count = count;\n- count += substr.size();\n- List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n- if (count >= K) {\n- answer = sorted_substr.get(K - prev_count - 1);\n- break;\n+ String s = sc.next();\n+ int k = sc.nextInt();\n+ List a = new ArrayList<>();\n+ for (int i = 1; i <= k; i++) {\n+ for (int j = 0; j <= s.length() - i; j++) {\n+ if (!a.contains(s.substring(j, j + i))) {\n+ a.add(s.substring(j, j + i));\n }\n }\n }\n- System.out.println(answer);\n+ Collections.sort(a);\n+ System.out.println(a.get(k - 1));\n }\n }", "output": "FASTER 2.0008", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 4.0023, "pair_id": "java_2094_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String... args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n List a = new ArrayList<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j <= s.length() - i; j++) {\n if (!a.contains(s.substring(j, j + i))) {\n a.add(s.substring(j, j + i));\n }\n }\n }\n Collections.sort(a);\n System.out.println(a.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.stream.Collectors;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String str = sc.nextLine();\n int K = sc.nextInt();\n char[] alpha = {\n 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n 't', 'u', 'v', 'w', 'x', 'y', 'z'\n };\n int count = 0;\n String answer = new String();\n\n for (int i = 0; i < alpha.length; i++) {\n char c = alpha[i];\n int[] idx_tmp = new int[5000];\n int[] idx;\n int idxidx = 0;\n boolean nozero_flag = false;\n for (int j = 0; j < str.length(); j++) {\n if (c == str.charAt(j)) {\n idx_tmp[idxidx] = j;\n idxidx++;\n nozero_flag = true;\n }\n }\n idx = new int[idxidx];\n if (nozero_flag) {\n HashSet substr = new HashSet<>();\n idx[0] = idx_tmp[0];\n for (int l = 1; l < idxidx; l++) {\n if (idx_tmp[l] != 0) {\n idx[l] = idx_tmp[l];\n } else {\n break;\n }\n }\n for (int j = 0; j < idx.length; j++) {\n int index = idx[j];\n for (int k = 0; k < K; k++) {\n if (index + k < str.length()) {\n substr.add(str.substring(index, index + k + 1));\n }\n }\n }\n int prev_count = count;\n count += substr.size();\n List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n if (count >= K) {\n answer = sorted_substr.get(K - prev_count - 1);\n break;\n }\n }\n }\n System.out.println(answer);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.HashSet;\n+import java.util.List;\n+import java.util.Scanner;\n+import java.util.stream.Collectors;\n \n public class Main {\n- public static void main(String... args) {\n+ public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n- int k = sc.nextInt();\n- List a = new ArrayList<>();\n- for (int i = 1; i <= k; i++) {\n- for (int j = 0; j <= s.length() - i; j++) {\n- if (!a.contains(s.substring(j, j + i))) {\n- a.add(s.substring(j, j + i));\n+ String str = sc.nextLine();\n+ int K = sc.nextInt();\n+ char[] alpha = {\n+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',\n+ 't', 'u', 'v', 'w', 'x', 'y', 'z'\n+ };\n+ int count = 0;\n+ String answer = new String();\n+\n+ for (int i = 0; i < alpha.length; i++) {\n+ char c = alpha[i];\n+ int[] idx_tmp = new int[5000];\n+ int[] idx;\n+ int idxidx = 0;\n+ boolean nozero_flag = false;\n+ for (int j = 0; j < str.length(); j++) {\n+ if (c == str.charAt(j)) {\n+ idx_tmp[idxidx] = j;\n+ idxidx++;\n+ nozero_flag = true;\n+ }\n+ }\n+ idx = new int[idxidx];\n+ if (nozero_flag) {\n+ HashSet substr = new HashSet<>();\n+ idx[0] = idx_tmp[0];\n+ for (int l = 1; l < idxidx; l++) {\n+ if (idx_tmp[l] != 0) {\n+ idx[l] = idx_tmp[l];\n+ } else {\n+ break;\n+ }\n+ }\n+ for (int j = 0; j < idx.length; j++) {\n+ int index = idx[j];\n+ for (int k = 0; k < K; k++) {\n+ if (index + k < str.length()) {\n+ substr.add(str.substring(index, index + k + 1));\n+ }\n+ }\n+ }\n+ int prev_count = count;\n+ count += substr.size();\n+ List sorted_substr = substr.stream().sorted().collect(Collectors.toList());\n+ if (count >= K) {\n+ answer = sorted_substr.get(K - prev_count - 1);\n+ break;\n }\n }\n }\n- Collections.sort(a);\n- System.out.println(a.get(k - 1));\n+ System.out.println(answer);\n }\n }", "output": "SLOWER 2.0008", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 4.0023, "pair_id": "java_2094_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n-import java.util.TreeSet;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.NoSuchElementException;\n \n public class Main {\n- public static void main(String args[]) {\n- Scanner sc = new Scanner(System.in);\n- String s = sc.next();\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FasterScanner in = new FasterScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskC solver = new TaskC();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- TreeSet sub = new TreeSet();\n+ static class TaskC {\n+ public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n+ String s = in.next();\n+ final int k = in.nextInt();\n \n- for (int i = 1; i <= 5; i++) {\n- for (int n = 0; n < s.length(); n++) {\n- if ((n + i) >= s.length()) {\n- sub.add(s.substring(n, s.length()));\n- } else {\n- sub.add(s.substring(n, (n + i)));\n+ List ans = new LinkedList<>();\n+ for (int i = 0; i < s.length(); i++) {\n+ String ss = s.substring(i, i + 1);\n+ if (!ans.contains(ss)) ans.add(ss);\n+ }\n+ Collections.sort(ans);\n+ ans = ans.subList(0, Math.min(k, ans.size()));\n+\n+ while (true) {\n+ List next = new LinkedList<>();\n+ for (String cs : ans) {\n+ String clone = s;\n+ while (clone.contains(cs)) {\n+ int index = clone.indexOf(cs);\n+ String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n+ if (!next.contains(ns)) next.add(ns);\n+ clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n+ }\n+ if (!next.contains(cs)) next.add(cs);\n }\n+ Collections.sort(next);\n+ if (ans.size() < k) {\n+ ans = next.subList(0, Math.min(k, next.size()));\n+ continue;\n+ }\n+ for (int i = 0; i < k; i++) {\n+ if (!ans.get(i).equals(next.get(i))) break;\n+ if (i == k - 1) {\n+ out.println(ans.get(k - 1));\n+ return;\n+ }\n+ }\n+ ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n+ }\n \n- int k = sc.nextInt();\n- int count = 0;\n- for (String st : sub) {\n- count++;\n- if (count == k) {\n- System.out.println(st);\n- break;\n+ static class FasterScanner {\n+ private InputStream in;\n+ private byte[] buffer;\n+ private int bufPointer;\n+ private int bufLength;\n+\n+ public FasterScanner(InputStream in) {\n+ this.in = in;\n+ buffer = new byte[1024];\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (bufPointer < bufLength) return true;\n+ bufPointer = 0;\n+ try {\n+ bufLength = in.read(buffer);\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ return (bufLength > 0);\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) return buffer[bufPointer++];\n+ return -1;\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return (c >= 33 && c <= 126);\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ StringBuilder sb = new StringBuilder();\n+ int b = readByte();\n+ while (isPrintableChar(b)) {\n+ sb.appendCodePoint(b);\n+ b = readByte();\n+ }\n+ return sb.toString();\n+ }\n+\n+ public int nextInt() {\n+ long nl = nextLong();\n+ if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n+ return (int) nl;\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) throw new NoSuchElementException();\n+ long n = 0;\n+ boolean minus = false;\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ b = readByte();\n+ }\n+ if (b < '0' || b > '9') throw new NumberFormatException();\n+\n+ while (true) {\n+ if (b >= '0' && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ b = readByte();\n }\n }\n }\n }", "output": "FASTER 2.6232", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 6.161, "pair_id": "java_2067_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.NoSuchElementException;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FasterScanner in = new FasterScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n String s = in.next();\n final int k = in.nextInt();\n\n List ans = new LinkedList<>();\n for (int i = 0; i < s.length(); i++) {\n String ss = s.substring(i, i + 1);\n if (!ans.contains(ss)) ans.add(ss);\n }\n Collections.sort(ans);\n ans = ans.subList(0, Math.min(k, ans.size()));\n\n while (true) {\n List next = new LinkedList<>();\n for (String cs : ans) {\n String clone = s;\n while (clone.contains(cs)) {\n int index = clone.indexOf(cs);\n String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n if (!next.contains(ns)) next.add(ns);\n clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n }\n if (!next.contains(cs)) next.add(cs);\n }\n Collections.sort(next);\n if (ans.size() < k) {\n ans = next.subList(0, Math.min(k, next.size()));\n continue;\n }\n for (int i = 0; i < k; i++) {\n if (!ans.get(i).equals(next.get(i))) break;\n if (i == k - 1) {\n out.println(ans.get(k - 1));\n return;\n }\n }\n ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n }\n\n static class FasterScanner {\n private InputStream in;\n private byte[] buffer;\n private int bufPointer;\n private int bufLength;\n\n public FasterScanner(InputStream in) {\n this.in = in;\n buffer = new byte[1024];\n }\n\n private boolean hasNextByte() {\n if (bufPointer < bufLength) return true;\n bufPointer = 0;\n try {\n bufLength = in.read(buffer);\n } catch (IOException e) {\n e.printStackTrace();\n }\n return (bufLength > 0);\n }\n\n private int readByte() {\n if (hasNextByte()) return buffer[bufPointer++];\n return -1;\n }\n\n private static boolean isPrintableChar(int c) {\n return (c >= 33 && c <= 126);\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) throw new NoSuchElementException();\n StringBuilder sb = new StringBuilder();\n int b = readByte();\n while (isPrintableChar(b)) {\n sb.appendCodePoint(b);\n b = readByte();\n }\n return sb.toString();\n }\n\n public int nextInt() {\n long nl = nextLong();\n if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n return (int) nl;\n }\n\n public long nextLong() {\n if (!hasNext()) throw new NoSuchElementException();\n long n = 0;\n boolean minus = false;\n int b = readByte();\n if (b == '-') {\n minus = true;\n b = readByte();\n }\n if (b < '0' || b > '9') throw new NumberFormatException();\n\n while (true) {\n if (b >= '0' && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n b = readByte();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\nimport java.util.TreeSet;\n\npublic class Main {\n public static void main(String args[]) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n\n TreeSet sub = new TreeSet();\n\n for (int i = 1; i <= 5; i++) {\n for (int n = 0; n < s.length(); n++) {\n if ((n + i) >= s.length()) {\n sub.add(s.substring(n, s.length()));\n } else {\n sub.add(s.substring(n, (n + i)));\n }\n }\n }\n\n int k = sc.nextInt();\n int count = 0;\n for (String st : sub) {\n count++;\n if (count == k) {\n System.out.println(st);\n break;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.NoSuchElementException;\n+import java.util.Scanner;\n+import java.util.TreeSet;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FasterScanner in = new FasterScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskC solver = new TaskC();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+ public static void main(String args[]) {\n+ Scanner sc = new Scanner(System.in);\n+ String s = sc.next();\n \n- static class TaskC {\n- public void solve(int testNumber, FasterScanner in, PrintWriter out) {\n- String s = in.next();\n- final int k = in.nextInt();\n+ TreeSet sub = new TreeSet();\n \n- List ans = new LinkedList<>();\n- for (int i = 0; i < s.length(); i++) {\n- String ss = s.substring(i, i + 1);\n- if (!ans.contains(ss)) ans.add(ss);\n- }\n- Collections.sort(ans);\n- ans = ans.subList(0, Math.min(k, ans.size()));\n-\n- while (true) {\n- List next = new LinkedList<>();\n- for (String cs : ans) {\n- String clone = s;\n- while (clone.contains(cs)) {\n- int index = clone.indexOf(cs);\n- String ns = clone.substring(index, Math.min(index + cs.length() + 1, clone.length()));\n- if (!next.contains(ns)) next.add(ns);\n- clone = clone.subSequence(0, index) + clone.substring(index + 1, clone.length());\n- }\n- if (!next.contains(cs)) next.add(cs);\n+ for (int i = 1; i <= 5; i++) {\n+ for (int n = 0; n < s.length(); n++) {\n+ if ((n + i) >= s.length()) {\n+ sub.add(s.substring(n, s.length()));\n+ } else {\n+ sub.add(s.substring(n, (n + i)));\n }\n- Collections.sort(next);\n- if (ans.size() < k) {\n- ans = next.subList(0, Math.min(k, next.size()));\n- continue;\n- }\n- for (int i = 0; i < k; i++) {\n- if (!ans.get(i).equals(next.get(i))) break;\n- if (i == k - 1) {\n- out.println(ans.get(k - 1));\n- return;\n- }\n- }\n- ans = next.subList(0, Math.min(k, next.size()));\n }\n }\n- }\n \n- static class FasterScanner {\n- private InputStream in;\n- private byte[] buffer;\n- private int bufPointer;\n- private int bufLength;\n-\n- public FasterScanner(InputStream in) {\n- this.in = in;\n- buffer = new byte[1024];\n- }\n-\n- private boolean hasNextByte() {\n- if (bufPointer < bufLength) return true;\n- bufPointer = 0;\n- try {\n- bufLength = in.read(buffer);\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- return (bufLength > 0);\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) return buffer[bufPointer++];\n- return -1;\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return (c >= 33 && c <= 126);\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[bufPointer])) bufPointer++;\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) throw new NoSuchElementException();\n- StringBuilder sb = new StringBuilder();\n- int b = readByte();\n- while (isPrintableChar(b)) {\n- sb.appendCodePoint(b);\n- b = readByte();\n- }\n- return sb.toString();\n- }\n-\n- public int nextInt() {\n- long nl = nextLong();\n- if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();\n- return (int) nl;\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) throw new NoSuchElementException();\n- long n = 0;\n- boolean minus = false;\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- b = readByte();\n- }\n- if (b < '0' || b > '9') throw new NumberFormatException();\n-\n- while (true) {\n- if (b >= '0' && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- b = readByte();\n+ int k = sc.nextInt();\n+ int count = 0;\n+ for (String st : sub) {\n+ count++;\n+ if (count == k) {\n+ System.out.println(st);\n+ break;\n }\n }\n }\n }", "output": "SLOWER 2.6232", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 6.161, "pair_id": "java_2067_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n import java.util.Collections;\n-import java.util.LinkedHashSet;\n+import java.util.HashSet;\n import java.util.List;\n import java.util.Scanner;\n import java.util.Set;\n \n public class Main {\n \n public static void main(String[] args) {\n-\n Scanner sc = new Scanner(System.in);\n-\n String s = sc.next();\n- int n = s.length();\n int k = sc.nextInt();\n- List list = new ArrayList<>();\n-\n+ Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < n - i + 1; j++) {\n- String tmp = s.substring(j, j + i);\n- list.add(tmp);\n+ for (int j = 0; j < s.length() - i + 1; j++) {\n+ set.add(s.substring(j, j + i));\n }\n }\n-\n+ List list = new ArrayList<>(set);\n Collections.sort(list);\n- Set set = new LinkedHashSet();\n- set.addAll(list);\n-\n- String[] array = set.toArray(new String[set.size()]);\n-\n- System.out.println(array[k - 1]);\n-\n- sc.close();\n+ System.out.println(list.get(k - 1));\n }\n }", "output": "FASTER 0.6969", "problem_id": "p03353", "direction": "forward", "speedup_ratio": 1.621, "pair_id": "java_2099_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.HashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n String s = sc.next();\n int k = sc.nextInt();\n Set set = new HashSet<>();\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < s.length() - i + 1; j++) {\n set.add(s.substring(j, j + i));\n }\n }\n List list = new ArrayList<>(set);\n Collections.sort(list);\n System.out.println(list.get(k - 1));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedHashSet;\nimport java.util.List;\nimport java.util.Scanner;\nimport java.util.Set;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n String s = sc.next();\n int n = s.length();\n int k = sc.nextInt();\n List list = new ArrayList<>();\n\n for (int i = 1; i <= k; i++) {\n for (int j = 0; j < n - i + 1; j++) {\n String tmp = s.substring(j, j + i);\n list.add(tmp);\n }\n }\n\n Collections.sort(list);\n Set set = new LinkedHashSet();\n set.addAll(list);\n\n String[] array = set.toArray(new String[set.size()]);\n\n System.out.println(array[k - 1]);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n import java.util.Collections;\n-import java.util.HashSet;\n+import java.util.LinkedHashSet;\n import java.util.List;\n import java.util.Scanner;\n import java.util.Set;\n \n public class Main {\n \n public static void main(String[] args) {\n+\n Scanner sc = new Scanner(System.in);\n+\n String s = sc.next();\n+ int n = s.length();\n int k = sc.nextInt();\n- Set set = new HashSet<>();\n+ List list = new ArrayList<>();\n+\n for (int i = 1; i <= k; i++) {\n- for (int j = 0; j < s.length() - i + 1; j++) {\n- set.add(s.substring(j, j + i));\n+ for (int j = 0; j < n - i + 1; j++) {\n+ String tmp = s.substring(j, j + i);\n+ list.add(tmp);\n }\n }\n- List list = new ArrayList<>(set);\n+\n Collections.sort(list);\n- System.out.println(list.get(k - 1));\n+ Set set = new LinkedHashSet();\n+ set.addAll(list);\n+\n+ String[] array = set.toArray(new String[set.size()]);\n+\n+ System.out.println(array[k - 1]);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.6969", "problem_id": "p03353", "direction": "reversed", "speedup_ratio": 1.621, "pair_id": "java_2099_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n+import java.io.FileNotFoundException;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n+import java.util.PriorityQueue;\n import java.util.StringTokenizer;\n \n-public class C {\n-\n- class Edge {\n- int to;\n- int w;\n-\n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n- }\n- }\n-\n- private void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n- }\n-\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n- }\n-\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n- }\n- }\n- }\n-\n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n }\n }\n }\n-\n- if (used[t]) {\n- res = x;\n- r = x - 1;\n- } else {\n- l = x + 1;\n- }\n- }\n-\n- if (res == inf) {\n- println(\"-1\");\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n } else {\n- println(res);\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n }\n }\n }", "output": "FASTER 0.0538", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.038, "pair_id": "java_9863_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.PriorityQueue;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class C_Round_119_Div1 {\n+public class C {\n \n- public static long MOD = 1000000007;\n+ class Edge {\n+ int to;\n+ int w;\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n+ }\n+ }\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n+ private void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n }\n- ArrayList[] map = new ArrayList[n];\n+\n+ ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n \n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n+\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n }\n }\n- out.println(result);\n \n- out.close();\n- }\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n \n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n }\n }\n }\n- }\n- return dist[t] != -1;\n- }\n \n- static class Dist implements Comparable {\n-\n- int pos, max, nearest;\n-\n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n+ } else {\n+ l = x + 1;\n+ }\n }\n \n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n }\n }\n \n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n }\n- return result;\n+ return tokenizer.nextToken();\n }\n \n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n+ private int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n }\n \n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n- }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n+ private void print(Object o) {\n+ writer.print(o);\n }\n \n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n+ private void println(Object o) {\n+ writer.println(o);\n }\n \n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n }\n \n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n \n- static class Scanner {\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n \n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n }\n }\n }", "output": "SLOWER 0.0538", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.038, "pair_id": "java_9863_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.PrintStream;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-import java.io.*;\n-import java.util.*;\n-\n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n-\n- void solve() throws Exception {\n-\n- n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n- for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n- }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n-\n- if (can(mid)) high = mid;\n- else low = mid;\n- }\n- System.out.println(high == n + 2 ? -1 : high);\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n+\n+ int s;\n+ int t;\n+\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n }\n \n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n }\n- return d[t] != Integer.MAX_VALUE;\n+\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n+\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n+\n+ int remove() {\n+ return queue[head++];\n+ }\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- void run() throws Exception {\n-\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n- solve();\n- reader.close();\n- writer.close();\n- }\n-\n- int nextInt() throws Exception {\n- return Integer.parseInt(nextToken());\n- }\n-\n- long nextLong() throws Exception {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws Exception {\n- return Double.parseDouble(nextToken());\n- }\n-\n- String nextString() throws Exception {\n- return nextToken();\n- }\n-\n- String nextLine() throws Exception {\n- return reader.readLine();\n- }\n-\n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n+ }\n+ }\n+ }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n- return stk.nextToken();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n+ return false;\n }\n }", "output": "FASTER 3.6793", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 12.811, "pair_id": "java_9856_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n-import java.util.Arrays;\n-import java.util.Scanner;\n \n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n+import java.io.*;\n+import java.util.*;\n+\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n+\n+ void solve() throws Exception {\n+\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n+\n+ if (can(mid)) high = mid;\n+ else low = mid;\n+ }\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n \n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n+ }\n }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n+\n+ void run() throws Exception {\n+\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n }\n \n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n+ int nextInt() throws Exception {\n+ return Integer.parseInt(nextToken());\n }\n \n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n+ long nextLong() throws Exception {\n+ return Long.parseLong(nextToken());\n }\n \n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n- }\n+ double nextDouble() throws Exception {\n+ return Double.parseDouble(nextToken());\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ String nextString() throws Exception {\n+ return nextToken();\n+ }\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n- }\n- }\n- }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n+ }\n+\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n }\n- return false;\n+ return stk.nextToken();\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ new Solution().run();\n }\n }", "output": "SLOWER 3.6793", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 12.811, "pair_id": "java_9856_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n public class C {\n \n- class Edge {\n- int to;\n- int w;\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n+ static final int INF = Integer.MAX_VALUE / 2;\n+\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n }\n+ return d[t] <= max;\n }\n \n- private void solve() throws IOException {\n+ void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n \n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n \n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n \n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n+ nearDist = new int[n];\n \n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n }\n \n while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n+ }\n+\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n+\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n }\n }\n+ return st.nextToken();\n+ }\n \n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n- }\n- }\n- }\n-\n- if (used[t]) {\n- res = x;\n- r = x - 1;\n- } else {\n- l = x + 1;\n- }\n- }\n-\n- if (res == inf) {\n- println(\"-1\");\n- } else {\n- println(res);\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws NumberFormatException, IOException {\n+ int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n+ long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "FASTER 0.0535", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0378, "pair_id": "java_9868_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n public class C {\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ class Edge {\n+ int to;\n+ int w;\n \n- static final int INF = Integer.MAX_VALUE / 2;\n-\n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n }\n- return d[t] <= max;\n }\n \n- void solve() throws IOException {\n+ private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n \n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n+ for (int i = 0; i < k; i++) {\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n }\n \n- s = nextInt() - 1;\n- t = nextInt() - 1;\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n \n- nearDist = new int[n];\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n \n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n }\n \n while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n }\n+ }\n }\n \n- int l = 0;\n+ int l = 1;\n int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n+\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n+\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n+ }\n+ }\n+ }\n+\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n+ } else {\n+ l = x + 1;\n+ }\n }\n \n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n }\n }\n \n- int nextInt() throws IOException {\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws IOException {\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ private void print(Object o) {\n+ writer.print(o);\n+ }\n+\n+ private void println(Object o) {\n+ writer.println(o);\n+ }\n+\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n+ }\n+\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ }\n+\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n+\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n+ }\n }\n }", "output": "SLOWER 0.0535", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0378, "pair_id": "java_9868_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.PriorityQueue;\n+import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n+public class Solver {\n \n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n+\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n+ }\n+ return Stok.nextToken();\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n }\n \n- int[] par;\n- int[] rank;\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n+ }\n \n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n }\n }\n \n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n+\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n }\n }\n }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n+ }\n+ return curlen;\n+ }\n+\n+ public void Run() throws NumberFormatException, IOException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n+ }\n+\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n+\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n+\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n }\n+ que.add(next);\n }\n }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n- }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n \n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().run();\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "FASTER 0.0266", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0186, "pair_id": "java_9879_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n-import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class Solver {\n+public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n }\n \n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n-\n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n- }\n- return Stok.nextToken();\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- public int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n }\n \n- public double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n \n- public long nextLong() throws NumberFormatException, IOException {\n- return Long.parseLong(nextToken());\n- }\n+ int[] par;\n+ int[] rank;\n \n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n+ }\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n }\n }\n \n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n \n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n+ }\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n+ }\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n+ }\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n+ }\n }\n- return curlen;\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n+ }\n }\n \n- public void Run() throws NumberFormatException, IOException {\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n \n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n- }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }", "output": "SLOWER 0.0266", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0186, "pair_id": "java_9879_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n+import java.io.PrintStream;\n import java.util.Arrays;\n-import java.util.PriorityQueue;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class C_Round_119_Div1 {\n-\n- public static long MOD = 1000000007;\n-\n- public static void main(String[] args) throws FileNotFoundException {\n-\n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n- for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n- }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n- }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n- }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n- }\n- }\n- out.println(result);\n-\n- out.close();\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n }\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n+ int s;\n+ int t;\n+\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n+ }\n+\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n+ }\n+\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n+\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n+\n+ int remove() {\n+ return queue[head++];\n+ }\n+ }\n+\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n+\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n }\n- q.add(new Point(dist[i], i));\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n- return dist[t] != -1;\n- }\n-\n- static class Dist implements Comparable {\n-\n- int pos, max, nearest;\n-\n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n- }\n-\n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n- }\n-\n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n- }\n-\n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n- }\n-\n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n- }\n-\n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n- }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n- }\n-\n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n- }\n-\n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n- }\n-\n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n- }\n-\n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ return false;\n }\n }", "output": "FASTER 3.6433", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 12.4949, "pair_id": "java_9854_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.Scanner;\n-\n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n- }\n-\n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n-\n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+import java.util.PriorityQueue;\n+import java.util.StringTokenizer;\n+\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n out.println(result);\n- }\n-\n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n- }\n-\n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n- }\n-\n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n- }\n-\n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n- }\n- }\n-\n- Q q0;\n- Q q1;\n- boolean[] gf;\n-\n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n }\n- if (d < q) q0.add(v, d);\n+ q.add(new Point(dist[i], i));\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n- }\n- return false;\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n+ } else {\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "SLOWER 3.6433", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 12.4949, "pair_id": "java_9854_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import static java.util.Arrays.deepToString;\n \n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n- }\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n+public class C {\n \n- int s;\n- int t;\n+ static int[] par;\n+ static int[] sz;\n \n- void go() {\n+ static Random rng = new Random(58);\n \n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n- }\n-\n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n- }\n-\n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n- }\n-\n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n- }\n-\n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n- return false;\n+ writer.println(R != n ? R : -1);\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n+ }\n+\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 0.4724", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.3874, "pair_id": "java_9829_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n+import java.io.PrintStream;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n+ }\n \n-public class C {\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- static int[] par;\n- static int[] sz;\n+ int s;\n+ int t;\n \n- static Random rng = new Random(58);\n+ void go() {\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n- } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n+ }\n+\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n+ }\n+\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n+\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n+\n+ int remove() {\n+ return queue[head++];\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n- writer.println(R != n ? R : -1);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ return false;\n }\n }", "output": "SLOWER 0.4724", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.3874, "pair_id": "java_9829_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.Scanner;\n-\n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n- }\n-\n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n-\n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n- }\n-\n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n- }\n-\n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n- }\n-\n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n- }\n-\n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n- }\n- }\n-\n- Q q0;\n- Q q1;\n- boolean[] gf;\n-\n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n+ }\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n- }\n- return false;\n- }\n-}\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n+ }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n+ }\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 0.0134", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0093, "pair_id": "java_9846_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.util.ArrayList;\n+import java.io.PrintStream;\n import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n+ }\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ int s;\n+ int t;\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n-\n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n }\n \n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n \n- H[e] = true;\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n \n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+ int remove() {\n+ return queue[head++];\n+ }\n+ }\n \n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n- }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n-\n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n- }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n-\n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n- }\n-\n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n- }\n-\n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n+ return false;\n }\n }\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n- }\n- }\n-\n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n- }\n-\n- public void close() {\n- writer.close();\n- }\n-}\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "SLOWER 0.0134", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0093, "pair_id": "java_9846_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class C {\n-\n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n-\n- static final int INF = Integer.MAX_VALUE / 2;\n-\n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n+ }\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n- }\n- return d[t] <= max;\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n- }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n+ }\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n+ }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n- }\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-}\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 3.6568", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 12.613, "pair_id": "java_9848_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class C {\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ static final int INF = Integer.MAX_VALUE / 2;\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n+ }\n+\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n \n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n+ nearDist = new int[n];\n \n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n+ Arrays.fill(nearDist, INF);\n \n- adj[i].add(j);\n- adj[j].add(i);\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n }\n \n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n \n- H[e] = true;\n-\n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n-\n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n-\n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n+ q.add(to);\n }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n- }\n- }\n- }\n-\n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n- }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n }\n \n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n- }\n-}\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n }\n \n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- public void close() {\n- writer.close();\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "SLOWER 3.6568", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 12.613, "pair_id": "java_9848_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n+\n import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n public class C {\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ static int[] par;\n+ static int[] sz;\n \n- static final int INF = Integer.MAX_VALUE / 2;\n+ static Random rng = new Random(58);\n \n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n- }\n- return d[t] <= max;\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n- }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n+ }\n+ }\n+ }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n+ }\n+ writer.println(R != n ? R : -1);\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n+ }\n+\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.1159", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.3382, "pair_id": "java_9831_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n import java.io.*;\n-import java.math.*;\n import java.util.*;\n \n public class C {\n \n- static int[] par;\n- static int[] sz;\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- static Random rng = new Random(58);\n+ static final int INF = Integer.MAX_VALUE / 2;\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n- } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n+ }\n+\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n+ }\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n+ }\n+\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n+\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 4.1159", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.3382, "pair_id": "java_9831_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n+\n import java.io.*;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.math.*;\n+import java.util.*;\n \n public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n \n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n+ static int[] par;\n+\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n }\n- return str.nextToken();\n }\n \n- int nextInt() throws IOException {\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n+\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n+ }\n+ }\n+ }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n+ }\n+ writer.println(R != n ? R : -1);\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n+ }\n+\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n return Integer.parseInt(next());\n }\n \n- double nextDouble() throws IOException {\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n return Double.parseDouble(next());\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- int[] par;\n- int[] rank;\n-\n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n- }\n- }\n-\n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n- }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n- }\n- }\n- }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n- }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n- }\n-\n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().run();\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 3.8613", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 14.5332, "pair_id": "java_9844_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n import java.io.*;\n-import java.math.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- static int[] par;\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n+ }\n \n- static Random rng = new Random(58);\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n+ }\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n } else {\n- par[pv] = pu;\n+ par[v1] = v2;\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n+ }\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n+ arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n }\n }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n }\n }\n }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n+ if (get(st) == get(en)) {\n+ r = x;\n } else {\n- L = Q;\n+ l = x;\n }\n }\n- writer.println(R != n ? R : -1);\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n+ }\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n+ out.close();\n }\n \n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }", "output": "SLOWER 3.8613", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 14.5332, "pair_id": "java_9844_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n+import static java.util.Arrays.deepToString;\n+\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n public class C {\n \n- class Edge {\n- int to;\n- int w;\n+ static int[] par;\n+ static int[] sz;\n \n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n- private void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n- }\n-\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n+ int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n }\n-\n+ if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n- int u = q.poll();\n+ int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n }\n }\n }\n-\n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n-\n- if (used[t]) {\n- res = x;\n- r = x - 1;\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n } else {\n- l = x + 1;\n+ L = Q;\n }\n }\n-\n- if (res == inf) {\n- println(\"-1\");\n- } else {\n- println(res);\n- }\n+ writer.println(R != n ? R : -1);\n }\n \n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n }\n \n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- private void print(Object o) {\n- writer.print(o);\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- private void println(Object o) {\n- writer.println(o);\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n }\n \n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ static long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n \n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.1694", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.994, "pair_id": "java_9833_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n public class C {\n \n- static int[] par;\n- static int[] sz;\n+ class Edge {\n+ int to;\n+ int w;\n \n- static Random rng = new Random(58);\n-\n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n- } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n+ private void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n+ for (int i = 0; i < k; i++) {\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n+ }\n+\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n+ g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n+\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n+\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n }\n- if (si == -1) throw new AssertionError();\n+\n while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n+ int u = q.poll();\n for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n+\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n+\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n+\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n } else {\n- L = Q;\n+ l = x + 1;\n }\n }\n- writer.println(R != n ? R : -1);\n+\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n+ }\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n+ private int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n }\n \n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n+ private void print(Object o) {\n+ writer.print(o);\n }\n \n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n+ private void println(Object o) {\n+ writer.println(o);\n }\n \n- static int nextInt() {\n- return Integer.parseInt(next());\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n }\n \n- static long nextLong() {\n- return Long.parseLong(next());\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n \n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n \n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n+ }\n }\n }", "output": "SLOWER 4.1694", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.994, "pair_id": "java_9833_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+\n import java.io.*;\n-import java.math.BigInteger;\n import java.util.*;\n \n-public class C implements Runnable {\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n \n- private static final String TASK_NAME_FOR_IO = \"\";\n+ void solve() throws Exception {\n \n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n \n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n- public static void main(String[] args) {\n- new Thread(new C()).start();\n+ if (can(mid)) high = mid;\n+ else low = mid;\n+ }\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- int n;\n- boolean[] volunteer;\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n \n- class VList {\n- List list = new LinkedList();\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n+ }\n+ }\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- VList[] e;\n- int src, dst;\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n \n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n+ void run() throws Exception {\n \n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n-\n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n- }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n- }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n- } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n- }\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n-\n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n- }\n- }\n- }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n- }\n- }\n-\n- return false;\n- }\n-\n- public void run() {\n- long timeStart = System.currentTimeMillis();\n-\n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n-\n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws IOException {\n+ int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n \n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n+ long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n \n- private double nextDouble() throws IOException {\n+ double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n+\n+ String nextString() throws Exception {\n+ return nextToken();\n+ }\n+\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n+ }\n+\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n+ }\n+ return stk.nextToken();\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ new Solution().run();\n+ }\n }", "output": "FASTER 0.4725", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.3875, "pair_id": "java_9875_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-\n import java.io.*;\n+import java.math.BigInteger;\n import java.util.*;\n \n-public class Solution {\n+public class C implements Runnable {\n+\n+ private static final String TASK_NAME_FOR_IO = \"\";\n+\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+\n+ BufferedReader in;\n+ PrintWriter out;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n+\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n+ }\n+\n int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n+ boolean[] volunteer;\n \n- void solve() throws Exception {\n+ class VList {\n+ List list = new LinkedList();\n+ }\n \n+ VList[] e;\n+ int src, dst;\n+\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n+\n+ private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n- for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n+\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n \n- if (can(mid)) high = mid;\n- else low = mid;\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n }\n- System.out.println(high == n + 2 ? -1 : high);\n+\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n+ }\n+\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n+ }\n+\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n+\n+ if (!reachable(n)) {\n+\n+ out.print(\"-1\");\n+\n+ } else {\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n+ }\n+\n+ out.print(lo);\n+ }\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n+\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n+ }\n+ }\n+ }\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n+ }\n }\n \n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n+ return false;\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n \n- void run() throws Exception {\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n \n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n- solve();\n- reader.close();\n- writer.close();\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ }\n }\n \n- int nextInt() throws Exception {\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws Exception {\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws Exception {\n+ private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n-\n- String nextString() throws Exception {\n- return nextToken();\n- }\n-\n- String nextLine() throws Exception {\n- return reader.readLine();\n- }\n-\n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n- }\n- return stk.nextToken();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n- }\n }", "output": "SLOWER 0.4725", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.3875, "pair_id": "java_9875_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.math.BigInteger;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class C implements Runnable {\n+public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- private static final String TASK_NAME_FOR_IO = \"\";\n-\n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n-\n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n- public static void main(String[] args) {\n- new Thread(new C()).start();\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n }\n \n- int n;\n- boolean[] volunteer;\n-\n- class VList {\n- List list = new LinkedList();\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- VList[] e;\n- int src, dst;\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n \n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n \n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n+ int[] par;\n+ int[] rank;\n \n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n+ par[v1] = v2;\n }\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n \n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n+ }\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n+ }\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n+ }\n+ }\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n+ }\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n }\n }\n-\n- return false;\n- }\n-\n- public void run() {\n- long timeStart = System.currentTimeMillis();\n-\n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n-\n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n }\n }\n \n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- private int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }", "output": "FASTER 0.4056", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.3246, "pair_id": "java_9881_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.math.BigInteger;\n+import java.util.*;\n \n-public class C {\n+public class C implements Runnable {\n+\n+ private static final String TASK_NAME_FOR_IO = \"\";\n+\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+\n BufferedReader in;\n- StringTokenizer str;\n PrintWriter out;\n- String SK;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n \n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n+ int n;\n+ boolean[] volunteer;\n+\n+ class VList {\n+ List list = new LinkedList();\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n+ VList[] e;\n+ int src, dst;\n \n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n \n- int[] par;\n- int[] rank;\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n \n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n+\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n+\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n+ }\n+\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n+ }\n+\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n+\n+ if (!reachable(n)) {\n+\n+ out.print(\"-1\");\n+\n } else {\n- par[v1] = v2;\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n+ }\n+\n+ out.print(lo);\n }\n }\n \n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n- }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n }\n }\n }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n }\n }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n+\n+ return false;\n+ }\n+\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n+\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n+\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n \n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public static void main(String[] args) throws IOException {\n- new C().run();\n+ private int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 0.4056", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.3246, "pair_id": "java_9881_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n import java.util.StringTokenizer;\n \n public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n \n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n- }\n+ class Edge {\n+ int to;\n+ int w;\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- int[] par;\n- int[] rank;\n-\n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n }\n }\n \n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n-\n- void solve() throws IOException {\n+ private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n- int[] isup = new int[n];\n+\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n+\n+ ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n+ g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n+\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n+\n+ ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n+ g2[i] = new ArrayList();\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n+ }\n }\n }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n+\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n+\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n+\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n }\n }\n }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n+\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n } else {\n- l = x;\n+ l = x + 1;\n }\n }\n- if (r == n + 1) {\n- out.println(-1);\n+\n+ if (res == inf) {\n+ println(\"-1\");\n } else {\n- out.println(r);\n+ println(res);\n }\n }\n \n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public static void main(String[] args) throws IOException {\n+ private int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private void print(Object o) {\n+ writer.print(o);\n+ }\n+\n+ private void println(Object o) {\n+ writer.println(o);\n+ }\n+\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n+ }\n+\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ }\n+\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n+\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n+ }\n }\n }", "output": "FASTER 0.0492", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0347, "pair_id": "java_9877_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n import java.util.StringTokenizer;\n \n public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- class Edge {\n- int to;\n- int w;\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n+ }\n \n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n+ }\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n }\n }\n \n- private void solve() throws IOException {\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n+\n+ void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n-\n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n+ int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n+ isup[nextInt() - 1] = 1;\n }\n-\n- ArrayList[] g = new ArrayList[n];\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n+ arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n+ }\n }\n-\n- while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n+ dist[i] = 0;\n }\n }\n- }\n-\n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n-\n- if (used[t]) {\n- res = x;\n- r = x - 1;\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n } else {\n- l = x + 1;\n+ l = x;\n }\n }\n-\n- if (res == inf) {\n- println(\"-1\");\n+ if (r == n + 1) {\n+ out.println(-1);\n } else {\n- println(res);\n+ out.println(r);\n }\n }\n \n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n+ public static void main(String[] args) throws IOException {\n new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n }\n }", "output": "SLOWER 0.0492", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0347, "pair_id": "java_9877_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n \n-public class Solver {\n+import java.io.*;\n+import java.util.*;\n \n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n+\n+ void solve() throws Exception {\n+\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n+\n+ if (can(mid)) high = mid;\n+ else low = mid;\n+ }\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n \n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n+ }\n }\n- return Stok.nextToken();\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- public int nextInt() throws NumberFormatException, IOException {\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n+\n+ void run() throws Exception {\n+\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n+ }\n+\n+ int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n \n- public double nextDouble() throws NumberFormatException, IOException {\n+ long nextLong() throws Exception {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n \n- public long nextLong() throws NumberFormatException, IOException {\n- return Long.parseLong(nextToken());\n+ String nextString() throws Exception {\n+ return nextToken();\n }\n \n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n- }\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n }\n \n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n-\n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n- }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n- }\n- }\n- }\n- }\n- return curlen;\n+ return stk.nextToken();\n }\n \n- public void Run() throws NumberFormatException, IOException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n- }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n+ public static void main(String[] args) throws Exception {\n+ new Solution().run();\n }\n }", "output": "FASTER 0.0403", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0283, "pair_id": "java_9873_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.PriorityQueue;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-import java.io.*;\n-import java.util.*;\n+public class Solver {\n \n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n-\n- void solve() throws Exception {\n-\n- n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n- for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n- }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n-\n- if (can(mid)) high = mid;\n- else low = mid;\n- }\n- System.out.println(high == n + 2 ? -1 : high);\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n+\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n }\n-\n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n+ return Stok.nextToken();\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n-\n- void run() throws Exception {\n-\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n- solve();\n- reader.close();\n- writer.close();\n- }\n-\n- int nextInt() throws Exception {\n+ public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws Exception {\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws Exception {\n- return Double.parseDouble(nextToken());\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n+ }\n }\n \n- String nextString() throws Exception {\n- return nextToken();\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n+\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n+ }\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n+ }\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n+\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n+ }\n+ }\n+ }\n+ }\n+ return curlen;\n }\n \n- String nextLine() throws Exception {\n- return reader.readLine();\n- }\n+ public void Run() throws NumberFormatException, IOException {\n \n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n }\n- return stk.nextToken();\n- }\n \n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n+\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n+\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n+ }\n+ que.add(next);\n+ }\n+ }\n+ }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n+\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "SLOWER 0.0403", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0283, "pair_id": "java_9873_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.PriorityQueue;\n-import java.util.StringTokenizer;\n+import static java.util.Arrays.deepToString;\n \n-public class C_Round_119_Div1 {\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- public static long MOD = 1000000007;\n+public class C {\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ static int[] par;\n+ static int[] sz;\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n+ }\n+ }\n+\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n+\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n- }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n }\n }\n- out.println(result);\n-\n- out.close();\n- }\n-\n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n-\n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n- return dist[t] != -1;\n+ writer.println(R != n ? R : -1);\n }\n \n- static class Dist implements Comparable {\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- int pos, max, nearest;\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n \n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n+ writer.close();\n }\n \n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n+ return tok.nextToken();\n }\n \n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n+ static long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.1157", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.3359, "pair_id": "java_9830_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n-\n-public class C {\n-\n- static int[] par;\n- static int[] sz;\n-\n- static Random rng = new Random(58);\n-\n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.PriorityQueue;\n+import java.util.StringTokenizer;\n+\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n+ }\n+ }\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n- }\n- }\n-\n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n-\n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n try {\n- w = reader.readLine();\n+ return br.readLine();\n } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "SLOWER 4.1157", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.3359, "pair_id": "java_9830_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import static java.util.Arrays.deepToString;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+public class C {\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ static int[] par;\n+ static int[] sz;\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n+ }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n }\n-\n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n-\n- H[e] = true;\n-\n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n-\n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n-\n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ }\n+ }\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n-\n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n-\n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n+ writer.println(R != n ? R : -1);\n }\n \n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n }\n \n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n- }\n- }\n-\n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n- }\n-\n- public void close() {\n- writer.close();\n- }\n-}\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "FASTER 0.459", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.3746, "pair_id": "java_9828_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n-\n-public class C {\n-\n- static int[] par;\n- static int[] sz;\n-\n- static Random rng = new Random(58);\n-\n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n- } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n- }\n- }\n-\n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n-\n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n }\n- }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n writer.close();\n }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n- }\n-}\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "SLOWER 0.459", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.3746, "pair_id": "java_9828_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-\n-import java.io.*;\n-import java.util.*;\n-\n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n-\n- void solve() throws Exception {\n-\n- n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.PriorityQueue;\n+import java.util.StringTokenizer;\n+\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n- }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n-\n- if (can(mid)) high = mid;\n- else low = mid;\n- }\n- System.out.println(high == n + 2 ? -1 : high);\n- }\n-\n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n- }\n-\n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n- }\n-\n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n-\n- void run() throws Exception {\n-\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n- solve();\n- reader.close();\n- writer.close();\n- }\n-\n- int nextInt() throws Exception {\n- return Integer.parseInt(nextToken());\n- }\n-\n- long nextLong() throws Exception {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws Exception {\n- return Double.parseDouble(nextToken());\n- }\n-\n- String nextString() throws Exception {\n- return nextToken();\n- }\n-\n- String nextLine() throws Exception {\n- return reader.readLine();\n- }\n-\n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n- }\n- return stk.nextToken();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n+ }\n+ }\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n+ } else {\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "FASTER 0.036", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0253, "pair_id": "java_9862_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.PriorityQueue;\n-import java.util.StringTokenizer;\n \n-public class C_Round_119_Div1 {\n+import java.io.*;\n+import java.util.*;\n \n- public static long MOD = 1000000007;\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ void solve() throws Exception {\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n- for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n+\n+ if (can(mid)) high = mid;\n+ else low = mid;\n }\n- for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n- }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n- }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n- }\n- }\n- out.println(result);\n-\n- out.close();\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n \n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n- }\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n }\n- }\n }\n- return dist[t] != -1;\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- static class Dist implements Comparable {\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n \n- int pos, max, nearest;\n+ void run() throws Exception {\n \n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n }\n \n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n+ int nextInt() throws Exception {\n+ return Integer.parseInt(nextToken());\n }\n \n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n+ long nextLong() throws Exception {\n+ return Long.parseLong(nextToken());\n }\n \n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n+ double nextDouble() throws Exception {\n+ return Double.parseDouble(nextToken());\n }\n \n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n+ String nextString() throws Exception {\n+ return nextToken();\n }\n \n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n- }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n }\n \n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n+ return stk.nextToken();\n }\n \n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n- }\n-\n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n- }\n-\n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ public static void main(String[] args) throws Exception {\n+ new Solution().run();\n }\n }", "output": "SLOWER 0.036", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0253, "pair_id": "java_9862_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.math.BigInteger;\n import java.util.*;\n \n-public class C implements Runnable {\n+public class C {\n \n- private static final String TASK_NAME_FOR_IO = \"\";\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+ static final int INF = Integer.MAX_VALUE / 2;\n \n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n+ ArrayList[] g;\n \n- public static void main(String[] args) {\n- new Thread(new C()).start();\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n }\n \n- int n;\n- boolean[] volunteer;\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- class VList {\n- List list = new LinkedList();\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n+ }\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- VList[] e;\n- int src, dst;\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n \n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n \n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n- }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n- }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n- } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n-\n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n- }\n- }\n- }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n- }\n- }\n-\n- return false;\n- }\n-\n- public void run() {\n- long timeStart = System.currentTimeMillis();\n-\n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n-\n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws IOException {\n+ int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n+ long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- private double nextDouble() throws IOException {\n+ double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n }", "output": "FASTER 0.5083", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.4224, "pair_id": "java_9871_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n+import java.math.BigInteger;\n import java.util.*;\n \n-public class C {\n+public class C implements Runnable {\n \n- BufferedReader br;\n+ private static final String TASK_NAME_FOR_IO = \"\";\n+\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+\n+ BufferedReader in;\n PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n \n- static final int INF = Integer.MAX_VALUE / 2;\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n+ }\n \n- ArrayList[] g;\n+ int n;\n+ boolean[] volunteer;\n \n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n+ class VList {\n+ List list = new LinkedList();\n+ }\n+\n+ VList[] e;\n+ int src, dst;\n+\n+ LinkedList dQueue;\n+ int[] dBest;\n boolean[] inQueue;\n \n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n- }\n- return d[t] <= max;\n- }\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n }\n \n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n }\n \n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n }\n \n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n }\n \n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n \n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n+ if (!reachable(n)) {\n \n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n+ out.print(\"-1\");\n \n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n+ } else {\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n }\n- }\n- return st.nextToken();\n- }\n \n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ out.print(lo);\n }\n }\n \n- int nextInt() throws IOException {\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n+\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n+ }\n+ }\n+ }\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n+ }\n+ }\n+\n+ return false;\n+ }\n+\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n+\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n+\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ }\n+ }\n+\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws IOException {\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws IOException {\n+ private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 0.5083", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.4224, "pair_id": "java_9871_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Solver {\n+public class C {\n \n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n+\n+ static final int INF = Integer.MAX_VALUE / 2;\n+\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n }\n \n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n- return Stok.nextToken();\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- public int nextInt() throws NumberFormatException, IOException {\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n+\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+\n+ int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- public double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nextLong() throws NumberFormatException, IOException {\n+ long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n- }\n- }\n-\n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n-\n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n- }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n- }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n- }\n- }\n- }\n- }\n- return curlen;\n- }\n-\n- public void Run() throws NumberFormatException, IOException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n- }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "FASTER 0.0761", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0542, "pair_id": "java_9869_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.PriorityQueue;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-public class C {\n+public class Solver {\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n-\n- static final int INF = Integer.MAX_VALUE / 2;\n-\n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n- }\n- return d[t] <= max;\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n }\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n \n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n+ return Stok.nextToken();\n }\n \n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- public static void main(String[] args) throws IOException {\n- new C().inp();\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n }\n \n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n }\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n+\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n+ }\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n+ }\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n+\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n+ }\n+ }\n+ }\n+ }\n+ return curlen;\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n+ public void Run() throws NumberFormatException, IOException {\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n+ }\n+\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n+\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n+\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n+ }\n+ que.add(next);\n+ }\n+ }\n+ }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n+\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "SLOWER 0.0761", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0542, "pair_id": "java_9869_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n \n import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n+public class C {\n \n- void solve() throws Exception {\n+ static int[] par;\n \n- n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n- for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n-\n- if (can(mid)) high = mid;\n- else low = mid;\n- }\n- System.out.println(high == n + 2 ? -1 : high);\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n- }\n-\n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n+ }\n+ }\n+ }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n+ }\n+ writer.println(R != n ? R : -1);\n+ }\n \n- void run() throws Exception {\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n+ setTime();\n solve();\n- reader.close();\n+ printTime();\n+ printMemory();\n+\n writer.close();\n }\n \n- int nextInt() throws Exception {\n- return Integer.parseInt(nextToken());\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- long nextLong() throws Exception {\n- return Long.parseLong(nextToken());\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- double nextDouble() throws Exception {\n- return Double.parseDouble(nextToken());\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- String nextString() throws Exception {\n- return nextToken();\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- String nextLine() throws Exception {\n- return reader.readLine();\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n }\n \n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n- }\n- return stk.nextToken();\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 3.7944", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.8748, "pair_id": "java_9841_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n \n import java.io.*;\n-import java.math.*;\n import java.util.*;\n \n-public class C {\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n \n- static int[] par;\n+ void solve() throws Exception {\n \n- static Random rng = new Random(58);\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n- } else {\n- par[pv] = pu;\n+ if (can(mid)) high = mid;\n+ else low = mid;\n }\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n+\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n+ }\n+ }\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n+\n+ void run() throws Exception {\n+\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n+ }\n+\n+ int nextInt() throws Exception {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ long nextLong() throws Exception {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws Exception {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ String nextString() throws Exception {\n+ return nextToken();\n+ }\n+\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n+ }\n+\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n+ return stk.nextToken();\n }\n \n public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ new Solution().run();\n }\n }", "output": "SLOWER 3.7944", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.8748, "pair_id": "java_9841_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import static java.util.Arrays.deepToString;\n \n import java.io.*;\n import java.math.*;\n import java.util.*;\n \n public class C {\n \n static int[] par;\n- static int[] sz;\n \n static Random rng = new Random(58);\n \n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n+ if (rng.nextBoolean()) {\n par[pu] = pv;\n- sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n- sz[pu] += sz[pv];\n }\n }\n \n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n- sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n- sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n \n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n \n setTime();\n solve();\n printTime();\n printMemory();\n \n writer.close();\n }\n \n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n \n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n \n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n \n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n \n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n \n static int nextInt() {\n return Integer.parseInt(next());\n }\n \n static long nextLong() {\n return Long.parseLong(next());\n }\n \n static double nextDouble() {\n return Double.parseDouble(next());\n }\n \n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n }", "output": "FASTER 0.065", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0461, "pair_id": "java_2864_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import static java.util.Arrays.deepToString;\n \n import java.io.*;\n import java.math.*;\n import java.util.*;\n \n public class C {\n \n static int[] par;\n+ static int[] sz;\n \n static Random rng = new Random(58);\n \n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n+ if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n+ sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n+ sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n+ sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n \n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n \n setTime();\n solve();\n printTime();\n printMemory();\n \n writer.close();\n }\n \n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n \n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n \n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n \n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n \n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n \n static int nextInt() {\n return Integer.parseInt(next());\n }\n \n static long nextLong() {\n return Long.parseLong(next());\n }\n \n static double nextDouble() {\n return Double.parseDouble(next());\n }\n \n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n }", "output": "SLOWER 0.065", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0461, "pair_id": "java_2864_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import static java.util.Arrays.deepToString;\n \n import java.io.*;\n import java.math.*;\n import java.util.*;\n \n public class C {\n \n static int[] par;\n+ static int[] sz;\n \n static Random rng = new Random(58);\n \n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n+ if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n+ sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n+ sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n+ sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n \n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n \n setTime();\n solve();\n printTime();\n printMemory();\n \n writer.close();\n }\n \n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n \n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n \n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n \n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n \n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n \n static int nextInt() {\n return Integer.parseInt(next());\n }\n \n static long nextLong() {\n return Long.parseLong(next());\n }\n \n static double nextDouble() {\n return Double.parseDouble(next());\n }\n \n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n }", "output": "FASTER 0.3574", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.2811, "pair_id": "java_9827_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import static java.util.Arrays.deepToString;\n \n import java.io.*;\n import java.math.*;\n import java.util.*;\n \n public class C {\n \n static int[] par;\n- static int[] sz;\n \n static Random rng = new Random(58);\n \n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n+ if (rng.nextBoolean()) {\n par[pu] = pv;\n- sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n- sz[pu] += sz[pv];\n }\n }\n \n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n- sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n- sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n \n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n \n setTime();\n solve();\n printTime();\n printMemory();\n \n writer.close();\n }\n \n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n \n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n \n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n \n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n \n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n \n static int nextInt() {\n return Integer.parseInt(next());\n }\n \n static long nextLong() {\n return Long.parseLong(next());\n }\n \n static double nextDouble() {\n return Double.parseDouble(next());\n }\n \n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n }", "output": "SLOWER 0.3574", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.2811, "pair_id": "java_9827_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n+import java.io.Writer;\n import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n-\n-public class Solver {\n-\n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n- }\n-\n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n-\n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n- }\n- return Stok.nextToken();\n- }\n-\n- public int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nextLong() throws NumberFormatException, IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n- }\n- }\n-\n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n-\n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n- }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n- }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n+ }\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n- }\n- return curlen;\n- }\n-\n- public void Run() throws NumberFormatException, IOException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n }\n- que.add(next);\n- }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n- }\n-}\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 3.733", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.2965, "pair_id": "java_9851_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n+import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n+import java.io.InputStreamReader;\n import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n-import java.io.Writer;\n import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.PriorityQueue;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class Solver {\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n+ }\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n }\n+ return Stok.nextToken();\n+ }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n \n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n \n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n+ }\n \n- adj[i].add(j);\n- adj[j].add(i);\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n }\n+ }\n \n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n \n- H[e] = true;\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n+ }\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n+ }\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n \n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n-\n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n-\n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n- }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n }\n }\n }\n+ }\n+ return curlen;\n+ }\n \n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n- }\n+ public void Run() throws NumberFormatException, IOException {\n \n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n }\n \n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n- }\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n \n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n- }\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n \n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n+ }\n+ que.add(next);\n+ }\n+ }\n+ }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n+\n+ pw.flush();\n+ pw.close();\n }\n }\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n- }\n- }\n-\n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n- }\n-\n- public void close() {\n- writer.close();\n- }\n-}\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "SLOWER 3.733", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.2965, "pair_id": "java_9851_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n+\n import java.io.*;\n-import java.math.BigInteger;\n+import java.math.*;\n import java.util.*;\n \n-public class C implements Runnable {\n+public class C {\n \n- private static final String TASK_NAME_FOR_IO = \"\";\n+ static int[] par;\n \n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+ static Random rng = new Random(58);\n \n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n- public static void main(String[] args) {\n- new Thread(new C()).start();\n- }\n-\n- int n;\n- boolean[] volunteer;\n-\n- class VList {\n- List list = new LinkedList();\n- }\n-\n- VList[] e;\n- int src, dst;\n-\n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n-\n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n-\n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n- }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n- }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n+ par[pv] = pu;\n }\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n }\n }\n-\n- return false;\n+ writer.println(R != n ? R : -1);\n }\n \n- public void run() {\n- long timeStart = System.currentTimeMillis();\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n \n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n+ writer.close();\n }\n \n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- private int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- private double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.2668", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 19.2508, "pair_id": "java_9845_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n import java.io.*;\n-import java.math.*;\n+import java.math.BigInteger;\n import java.util.*;\n \n-public class C {\n+public class C implements Runnable {\n \n- static int[] par;\n+ private static final String TASK_NAME_FOR_IO = \"\";\n \n- static Random rng = new Random(58);\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n+ BufferedReader in;\n+ PrintWriter out;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n+\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n+ }\n+\n+ int n;\n+ boolean[] volunteer;\n+\n+ class VList {\n+ List list = new LinkedList();\n+ }\n+\n+ VList[] e;\n+ int src, dst;\n+\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n+\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n+\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n+ }\n+\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n+ }\n+\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n+ }\n+\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n+ }\n+\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n+\n+ if (!reachable(n)) {\n+\n+ out.print(\"-1\");\n+\n } else {\n- par[pv] = pu;\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n+ }\n+\n+ out.print(lo);\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n }\n }\n- writer.println(R != n ? R : -1);\n+\n+ return false;\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n \n- setTime();\n- solve();\n- printTime();\n- printMemory();\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n \n- writer.close();\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ }\n }\n \n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n }\n \n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n+ private int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n }\n \n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ private double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 4.2668", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 19.2508, "pair_id": "java_9845_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n+import java.io.FileNotFoundException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n+import java.util.Arrays;\n import java.util.PriorityQueue;\n-import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class Solver {\n-\n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n- }\n-\n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n-\n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n- }\n- return Stok.nextToken();\n- }\n-\n- public int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nextLong() throws NumberFormatException, IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n- }\n- }\n-\n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n-\n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n- }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n- }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n }\n- }\n- }\n- }\n- return curlen;\n- }\n-\n- public void Run() throws NumberFormatException, IOException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n+ }\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n+ } else {\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "FASTER 0.0763", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0543, "pair_id": "java_9864_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n+import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.Arrays;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n import java.util.PriorityQueue;\n+import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class C_Round_119_Div1 {\n+public class Solver {\n \n- public static long MOD = 1000000007;\n-\n- public static void main(String[] args) throws FileNotFoundException {\n-\n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n- for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n- }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n- }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n- }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n- }\n- }\n- out.println(result);\n-\n- out.close();\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n }\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n \n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n+ }\n+ return Stok.nextToken();\n+ }\n+\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n+ }\n+ }\n+\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n+\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n+ }\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n+ }\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n+\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n }\n }\n }\n }\n- return dist[t] != -1;\n+ return curlen;\n }\n \n- static class Dist implements Comparable {\n+ public void Run() throws NumberFormatException, IOException {\n \n- int pos, max, nearest;\n-\n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n }\n \n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n }\n \n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n- }\n-\n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n- }\n-\n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n- }\n-\n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n- }\n-\n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n- }\n-\n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n }\n \n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n }\n \n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n \n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n- }\n-\n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n+ }\n+ que.add(next);\n+ }\n }\n }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n \n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n- }\n-\n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n- }\n-\n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n- }\n-\n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "SLOWER 0.0763", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0543, "pair_id": "java_9864_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class C {\n- BufferedReader in;\n- StringTokenizer str;\n+\n+ BufferedReader br;\n PrintWriter out;\n- String SK;\n+ StringTokenizer st;\n+ boolean eof;\n \n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n+ static final int INF = Integer.MAX_VALUE / 2;\n+\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n }\n- return str.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- int[] par;\n- int[] rank;\n-\n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n- }\n- }\n-\n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n+ return d[t] <= max;\n }\n \n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n- }\n- }\n- }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n- }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n \n public static void main(String[] args) throws IOException {\n- new C().run();\n+ new C().inp();\n+ }\n+\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "FASTER 0.1027", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0738, "pair_id": "java_9870_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n+ }\n \n- static final int INF = Integer.MAX_VALUE / 2;\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- ArrayList[] g;\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n \n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n \n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n }\n- return d[t] <= max;\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n+ }\n+ }\n+\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n \n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n+ }\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = new ArrayList();\n+ }\n for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n+ }\n }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n }\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n+ }\n+ }\n+ }\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n+ }\n }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n }\n \n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n \n public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n- }\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ new C().run();\n }\n }", "output": "SLOWER 0.1027", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0738, "pair_id": "java_9870_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Comparator;\n-import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n+import static java.util.Arrays.deepToString;\n \n-public class Solver {\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n- }\n+public class C {\n \n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n+ static int[] par;\n \n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n- }\n- return Stok.nextToken();\n- }\n+ static Random rng = new Random(58);\n \n- public int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- public long nextLong() throws NumberFormatException, IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- class TCross {\n-\n- int numvol;\n- List con;\n- int len;\n-\n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n }\n }\n \n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n- return curlen;\n+ writer.println(R != n ? R : -1);\n }\n \n- public void Run() throws NumberFormatException, IOException {\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n+ }\n+\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n }\n+ return tok.nextToken();\n+ }\n \n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n \n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n \n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n \n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n- }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 3.8347", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 14.2676, "pair_id": "java_9843_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Comparator;\n+import java.util.LinkedList;\n+import java.util.List;\n+import java.util.PriorityQueue;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n+public class Solver {\n \n-public class C {\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n+ }\n \n- static int[] par;\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n \n- static Random rng = new Random(58);\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n+ }\n+ return Stok.nextToken();\n+ }\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n- } else {\n- par[pv] = pu;\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n+\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n+ }\n }\n }\n }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+ return curlen;\n+ }\n+\n+ public void Run() throws NumberFormatException, IOException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n+ }\n+\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n+\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n+\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n }\n+ que.add(next);\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n }\n- writer.println(R != n ? R : -1);\n- }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "SLOWER 3.8347", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 14.2676, "pair_id": "java_9843_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n-\n-public class C {\n-\n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n-\n- static final int INF = Integer.MAX_VALUE / 2;\n-\n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.PriorityQueue;\n+import java.util.StringTokenizer;\n+\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n }\n }\n- }\n- return d[t] <= max;\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n- }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n+ } else {\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n try {\n- st = new StringTokenizer(br.readLine());\n+ return br.readLine();\n } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n- }\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "FASTER 0.0001", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0001, "pair_id": "java_9861_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.PriorityQueue;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class C_Round_119_Div1 {\n+public class C {\n \n- public static long MOD = 1000000007;\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ static final int INF = Integer.MAX_VALUE / 2;\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n- for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ return d[t] <= max;\n+ }\n+\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n- for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n \n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n+ }\n \n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n- }\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n }\n- out.println(result);\n \n+ if (r == n) out.println(-1);\n+ else out.println(r);\n+ }\n+\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n out.close();\n }\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n \n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n- }\n- }\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n }\n }\n- return dist[t] != -1;\n+ return st.nextToken();\n }\n \n- static class Dist implements Comparable {\n-\n- int pos, max, nearest;\n-\n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n- }\n-\n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n- }\n-\n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n- }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n- }\n-\n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n- }\n-\n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n- }\n-\n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n- }\n-\n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 0.0001", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0001, "pair_id": "java_9861_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n \n import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n- int s, t;\n+public class C {\n \n- void solve() throws Exception {\n+ static int[] par;\n+ static int[] sz;\n \n- n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n- for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n+ } else {\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n-\n- if (can(mid)) high = mid;\n- else low = mid;\n- }\n- System.out.println(high == n + 2 ? -1 : high);\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n- }\n-\n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n+ }\n+ }\n+ }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n+ }\n+ writer.println(R != n ? R : -1);\n+ }\n \n- void run() throws Exception {\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n+ setTime();\n solve();\n- reader.close();\n+ printTime();\n+ printMemory();\n+\n writer.close();\n }\n \n- int nextInt() throws Exception {\n- return Integer.parseInt(nextToken());\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- long nextLong() throws Exception {\n- return Long.parseLong(nextToken());\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- double nextDouble() throws Exception {\n- return Double.parseDouble(nextToken());\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- String nextString() throws Exception {\n- return nextToken();\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- String nextLine() throws Exception {\n- return reader.readLine();\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n }\n \n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n- }\n- return stk.nextToken();\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.1517", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.7745, "pair_id": "java_9832_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n \n import java.io.*;\n-import java.math.*;\n import java.util.*;\n \n-public class C {\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n \n- static int[] par;\n- static int[] sz;\n+ void solve() throws Exception {\n \n- static Random rng = new Random(58);\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n- } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n+ if (can(mid)) high = mid;\n+ else low = mid;\n }\n+ System.out.println(high == n + 2 ? -1 : high);\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n+\n+ d[s] = 0;\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n+ }\n+ }\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n+\n+ void run() throws Exception {\n+\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n+ }\n+\n+ int nextInt() throws Exception {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ long nextLong() throws Exception {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws Exception {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ String nextString() throws Exception {\n+ return nextToken();\n+ }\n+\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n+ }\n+\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n+ return stk.nextToken();\n }\n \n public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ new Solution().run();\n }\n }", "output": "SLOWER 4.1517", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.7745, "pair_id": "java_9832_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n+\n import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n public class C {\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ static int[] par;\n \n- static final int INF = Integer.MAX_VALUE / 2;\n+ static Random rng = new Random(58);\n \n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n- }\n- return d[t] <= max;\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n-\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n- }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n }\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n+ }\n+ }\n+ }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n+ }\n+ writer.println(R != n ? R : -1);\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n+ }\n+\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 3.7585", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.5342, "pair_id": "java_9840_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n import java.io.*;\n-import java.math.*;\n import java.util.*;\n \n public class C {\n \n- static int[] par;\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n \n- static Random rng = new Random(58);\n+ static final int INF = Integer.MAX_VALUE / 2;\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n- } else {\n- par[pv] = pu;\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n+ }\n+\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n+ for (int i = 0; i < m; i++) {\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n+ }\n+\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n+ }\n+\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n+ }\n+\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 3.7585", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.5342, "pair_id": "java_9840_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import static java.util.Arrays.deepToString;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+public class C {\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ static int[] par;\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n }\n+ }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n }\n-\n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n-\n- H[e] = true;\n-\n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n-\n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n-\n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ }\n+ }\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n-\n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n-\n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n+ writer.println(R != n ? R : -1);\n }\n \n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n+\n+ writer.close();\n }\n \n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n+ }\n+\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n+ }\n+\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ }\n+\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n+ }\n+\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n- }\n- }\n-\n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n- }\n-\n- public void close() {\n- writer.close();\n- }\n-}\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "FASTER 0.1017", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.073, "pair_id": "java_9837_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n-\n-public class C {\n-\n- static int[] par;\n-\n- static Random rng = new Random(58);\n-\n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n- } else {\n- par[pv] = pu;\n- }\n- }\n-\n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n-\n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n }\n- }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n }\n- }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n writer.close();\n }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n- }\n-}\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "SLOWER 0.1017", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.073, "pair_id": "java_9837_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n+import java.io.BufferedWriter;\n import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n+import java.io.Writer;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n-\n-public class C {\n-\n- class Edge {\n- int to;\n- int w;\n-\n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n- }\n- }\n-\n- private void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n-\n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n- }\n-\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n- }\n-\n- while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n }\n- }\n- }\n-\n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n \n- if (used[t]) {\n- res = x;\n- r = x - 1;\n- } else {\n- l = x + 1;\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n+ }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- }\n-\n- if (res == inf) {\n- println(\"-1\");\n- } else {\n- println(res);\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n- }\n-}\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 3.7104", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.0901, "pair_id": "java_9850_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n+import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n+import java.io.InputStreamReader;\n import java.io.PrintWriter;\n-import java.io.Writer;\n import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class C {\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ class Edge {\n+ int to;\n+ int w;\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n+ }\n+ }\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ private void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n+ for (int i = 0; i < k; i++) {\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n-\n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n }\n \n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n \n- H[e] = true;\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n+ }\n \n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+ while (!q.isEmpty()) {\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n+ }\n+ }\n+ }\n \n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n \n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n \n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n- }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n }\n }\n }\n \n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n- }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n+ } else {\n+ l = x + 1;\n+ }\n }\n \n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n- }\n-\n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n- }\n-\n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n- }\n-}\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n }\n }\n \n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public void close() {\n- writer.close();\n- }\n-}\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n+ private int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private void print(Object o) {\n+ writer.print(o);\n+ }\n+\n+ private void println(Object o) {\n+ writer.println(o);\n+ }\n+\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n+ }\n+\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ }\n+\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n+\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n }\n }\n }", "output": "SLOWER 3.7104", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.0901, "pair_id": "java_9850_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.*;\n-\n-public class C implements Runnable {\n-\n- private static final String TASK_NAME_FOR_IO = \"\";\n-\n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n-\n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n- public static void main(String[] args) {\n- new Thread(new C()).start();\n- }\n-\n- int n;\n- boolean[] volunteer;\n-\n- class VList {\n- List list = new LinkedList();\n- }\n-\n- VList[] e;\n- int src, dst;\n-\n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n-\n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n-\n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n- }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n- }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n- } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n }\n- }\n-\n- out.print(lo);\n- }\n- }\n-\n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n-\n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n \n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n+ }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- }\n-\n- return false;\n- }\n-\n- public void run() {\n- long timeStart = System.currentTimeMillis();\n-\n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n-\n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n-}\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 4.1651", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.9405, "pair_id": "java_9853_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class C implements Runnable {\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ private static final String TASK_NAME_FOR_IO = \"\";\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ BufferedReader in;\n+ PrintWriter out;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n+\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n+ }\n+\n+ int n;\n+ boolean[] volunteer;\n+\n+ class VList {\n+ List list = new LinkedList();\n+ }\n+\n+ VList[] e;\n+ int src, dst;\n+\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n+\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n+\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n-\n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n }\n \n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n+ }\n \n- H[e] = true;\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n \n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n+ }\n \n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n \n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n+ if (!reachable(n)) {\n \n- for (int i = 0; i < N; i++) p[i] = i;\n+ out.print(\"-1\");\n \n- first = last = 0;\n- Arrays.fill(v, false);\n+ } else {\n \n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n }\n+ }\n \n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n+ out.print(lo);\n+ }\n+ }\n \n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n \n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n }\n }\n }\n \n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n- }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n+ }\n }\n \n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n+ return false;\n }\n \n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n- }\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n \n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n- }\n-}\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n \n-class State {\n- int i, d;\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n \n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n+ solve();\n \n-class DisjointSets {\n- static int[] p, rank;\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n \n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n \n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public void close() {\n- writer.close();\n+ private int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "SLOWER 4.1651", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.9405, "pair_id": "java_9853_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.PrintStream;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-public class C {\n-\n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n-\n- static final int INF = Integer.MAX_VALUE / 2;\n-\n- ArrayList[] g;\n-\n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n-\n- boolean check(int max) {\n- Arrays.fill(d, INF);\n- d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n- }\n- }\n- return d[t] <= max;\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n }\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+ int s;\n+ int t;\n \n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+ void go() {\n \n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n }\n \n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n }\n \n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n+ boolean isEmpty() {\n+ return head == tail;\n }\n \n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n }\n \n- if (r == n) out.println(-1);\n- else out.println(r);\n- }\n-\n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n+ int remove() {\n+ return queue[head++];\n }\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n+ }\n+ }\n+ }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n+ }\n+ return false;\n }\n }", "output": "FASTER 3.6435", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 12.4966, "pair_id": "java_9855_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n+public class C {\n+\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n+\n+ static final int INF = Integer.MAX_VALUE / 2;\n+\n+ ArrayList[] g;\n+\n+ int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n+\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n }\n \n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- int s;\n- int t;\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n \n- void go() {\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n \n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n \n- int result = solve();\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n \n- PrintStream out = System.out;\n- out.println(result);\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n }\n \n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n }\n- return lo < n ? lo : -1;\n+ return st.nextToken();\n }\n \n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n }\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n- }\n- }\n- }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n- }\n- return false;\n+ long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 3.6435", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 12.4966, "pair_id": "java_9855_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n+import java.io.PrintStream;\n import java.util.Arrays;\n-import java.util.LinkedList;\n-import java.util.Locale;\n-import java.util.Queue;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class C {\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n+ }\n \n- class Edge {\n- int to;\n- int w;\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n+ int s;\n+ int t;\n+\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n+ }\n+\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n+\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n+\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n+\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n+ }\n+\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n+ }\n+\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n+\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n+\n+ int remove() {\n+ return queue[head++];\n }\n }\n \n- private void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n- }\n-\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n- }\n-\n- while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n- }\n- }\n- }\n-\n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n-\n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n-\n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n-\n- if (used[t]) {\n- res = x;\n- r = x - 1;\n- } else {\n- l = x + 1;\n- }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n-\n- if (res == inf) {\n- println(\"-1\");\n- } else {\n- println(res);\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n+ return false;\n }\n }", "output": "FASTER 3.697", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 12.9693, "pair_id": "java_9857_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n import java.util.Arrays;\n-import java.util.Scanner;\n+import java.util.LinkedList;\n+import java.util.Locale;\n+import java.util.Queue;\n+import java.util.StringTokenizer;\n \n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n- }\n+public class C {\n \n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n+ class Edge {\n+ int to;\n+ int w;\n \n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n- }\n-\n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n- }\n-\n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n- }\n-\n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n- }\n-\n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n- }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n }\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ private void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n+ for (int i = 0; i < k; i++) {\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n+ }\n+\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n+\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n+ }\n+ }\n+ }\n+\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n+\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n+\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n+\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n+ } else {\n+ l = x + 1;\n+ }\n }\n- return false;\n+\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n+ }\n+ }\n+\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ private double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private void print(Object o) {\n+ writer.print(o);\n+ }\n+\n+ private void println(Object o) {\n+ writer.println(o);\n+ }\n+\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n+ }\n+\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ }\n+\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n+\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n+ }\n }\n }", "output": "SLOWER 3.697", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 12.9693, "pair_id": "java_9857_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-\n import java.io.*;\n import java.util.*;\n \n-public class Solution {\n- int n;\n- boolean[] have;\n- Integer[][] g;\n+public class C {\n+\n+ BufferedReader br;\n+ PrintWriter out;\n+ StringTokenizer st;\n+ boolean eof;\n+\n+ static final int INF = Integer.MAX_VALUE / 2;\n+\n+ ArrayList[] g;\n+\n int s, t;\n+ int[] nearDist;\n+ ArrayDeque q;\n+ int[] d;\n+ boolean[] inQueue;\n \n- void solve() throws Exception {\n+ boolean check(int max) {\n+ Arrays.fill(d, INF);\n+ d[s] = 0;\n+ q.add(s);\n+ inQueue[s] = true;\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ inQueue[v] = false;\n+ if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n+ for (int to : g[v])\n+ if (d[to] > d[v] + 1 && d[v] <= max) {\n+ d[to] = d[v] + 1;\n+ if (!inQueue[to]) {\n+ inQueue[to] = true;\n+ q.add(to);\n+ }\n+ }\n+ }\n+ return d[t] <= max;\n+ }\n \n- n = nextInt();\n+ void solve() throws IOException {\n+ int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n- have = new boolean[n];\n- for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n- ArrayList[] list = new ArrayList[n];\n- for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+\n+ int[] good = new int[k];\n+ for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+\n for (int i = 0; i < m; i++) {\n- int a = nextInt() - 1;\n- int b = nextInt() - 1;\n- list[a].add(b);\n- list[b].add(a);\n+ int v1 = nextInt() - 1;\n+ int v2 = nextInt() - 1;\n+ g[v1].add(v2);\n+ g[v2].add(v1);\n }\n- g = new Integer[n][];\n- for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+\n s = nextInt() - 1;\n t = nextInt() - 1;\n- int low = 0;\n- int high = n + 2;\n- while (high - low > 1) {\n- int mid = (low + high) / 2;\n \n- if (can(mid)) high = mid;\n- else low = mid;\n+ nearDist = new int[n];\n+\n+ Arrays.fill(nearDist, INF);\n+\n+ q = new ArrayDeque();\n+ inQueue = new boolean[n];\n+ d = new int[n];\n+\n+ for (int v : good) {\n+\n+ nearDist[v] = 0;\n+ q.add(v);\n }\n- System.out.println(high == n + 2 ? -1 : high);\n+\n+ while (!q.isEmpty()) {\n+ int v = q.poll();\n+ for (int to : g[v])\n+ if (nearDist[to] > nearDist[v] + 1) {\n+ nearDist[to] = nearDist[v] + 1;\n+\n+ q.add(to);\n+ }\n+ }\n+\n+ int l = 0;\n+ int r = n;\n+ while (l < r - 1) {\n+ int mid = (l + r) >> 1;\n+ if (check(mid)) r = mid;\n+ else l = mid;\n+ }\n+\n+ if (r == n) out.println(-1);\n+ else out.println(r);\n }\n \n- private boolean can(int q) {\n- int[] d = new int[n];\n- Queue queue = new LinkedList();\n- for (int i = 0; i < n; i++) {\n- d[i] = Integer.MAX_VALUE;\n- }\n-\n- d[s] = 0;\n- queue.add(s);\n- while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n- int at = queue.remove();\n- for (int next : g[at])\n- if (d[next] > d[at] + 1 && d[at] != q) {\n- d[next] = d[at] + 1;\n- if (have[next]) d[next] = 0;\n- queue.add(next);\n- }\n- }\n- return d[t] != Integer.MAX_VALUE;\n+ void inp() throws IOException {\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- BufferedReader reader;\n- PrintWriter writer;\n- StringTokenizer stk;\n-\n- void run() throws Exception {\n-\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- stk = null;\n- writer = new PrintWriter(new PrintWriter(System.out));\n- solve();\n- reader.close();\n- writer.close();\n+ public static void main(String[] args) throws IOException {\n+ new C().inp();\n }\n \n- int nextInt() throws Exception {\n+ String nextToken() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ String nextString() {\n+ try {\n+ return br.readLine();\n+ } catch (IOException e) {\n+ eof = true;\n+ return null;\n+ }\n+ }\n+\n+ int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws Exception {\n+ long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws Exception {\n+ double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n-\n- String nextString() throws Exception {\n- return nextToken();\n- }\n-\n- String nextLine() throws Exception {\n- return reader.readLine();\n- }\n-\n- String nextToken() throws Exception {\n- if (stk == null || !stk.hasMoreTokens()) {\n- stk = new StringTokenizer(nextLine());\n- return nextToken();\n- }\n- return stk.nextToken();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- new Solution().run();\n- }\n }", "output": "FASTER 0.0359", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0252, "pair_id": "java_9867_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class C {\n\n BufferedReader br;\n PrintWriter out;\n StringTokenizer st;\n boolean eof;\n\n static final int INF = Integer.MAX_VALUE / 2;\n\n ArrayList[] g;\n\n int s, t;\n int[] nearDist;\n ArrayDeque q;\n int[] d;\n boolean[] inQueue;\n\n boolean check(int max) {\n Arrays.fill(d, INF);\n d[s] = 0;\n q.add(s);\n inQueue[s] = true;\n while (!q.isEmpty()) {\n int v = q.poll();\n inQueue[v] = false;\n if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n for (int to : g[v])\n if (d[to] > d[v] + 1 && d[v] <= max) {\n d[to] = d[v] + 1;\n if (!inQueue[to]) {\n inQueue[to] = true;\n q.add(to);\n }\n }\n }\n return d[t] <= max;\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] good = new int[k];\n for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n\n for (int i = 0; i < m; i++) {\n int v1 = nextInt() - 1;\n int v2 = nextInt() - 1;\n g[v1].add(v2);\n g[v2].add(v1);\n }\n\n s = nextInt() - 1;\n t = nextInt() - 1;\n\n nearDist = new int[n];\n\n Arrays.fill(nearDist, INF);\n\n q = new ArrayDeque();\n inQueue = new boolean[n];\n d = new int[n];\n\n for (int v : good) {\n\n nearDist[v] = 0;\n q.add(v);\n }\n\n while (!q.isEmpty()) {\n int v = q.poll();\n for (int to : g[v])\n if (nearDist[to] > nearDist[v] + 1) {\n nearDist[to] = nearDist[v] + 1;\n\n q.add(to);\n }\n }\n\n int l = 0;\n int r = n;\n while (l < r - 1) {\n int mid = (l + r) >> 1;\n if (check(mid)) r = mid;\n else l = mid;\n }\n\n if (r == n) out.println(-1);\n else out.println(r);\n }\n\n void inp() throws IOException {\n br = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().inp();\n }\n\n String nextToken() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n eof = true;\n return null;\n }\n }\n return st.nextToken();\n }\n\n String nextString() {\n try {\n return br.readLine();\n } catch (IOException e) {\n eof = true;\n return null;\n }\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\n\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n int n;\n boolean[] have;\n Integer[][] g;\n int s, t;\n\n void solve() throws Exception {\n\n n = nextInt();\n int m = nextInt();\n int k = nextInt();\n have = new boolean[n];\n for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n ArrayList[] list = new ArrayList[n];\n for (int i = 0; i < n; i++) list[i] = new ArrayList();\n for (int i = 0; i < m; i++) {\n int a = nextInt() - 1;\n int b = nextInt() - 1;\n list[a].add(b);\n list[b].add(a);\n }\n g = new Integer[n][];\n for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n s = nextInt() - 1;\n t = nextInt() - 1;\n int low = 0;\n int high = n + 2;\n while (high - low > 1) {\n int mid = (low + high) / 2;\n\n if (can(mid)) high = mid;\n else low = mid;\n }\n System.out.println(high == n + 2 ? -1 : high);\n }\n\n private boolean can(int q) {\n int[] d = new int[n];\n Queue queue = new LinkedList();\n for (int i = 0; i < n; i++) {\n d[i] = Integer.MAX_VALUE;\n }\n\n d[s] = 0;\n queue.add(s);\n while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n int at = queue.remove();\n for (int next : g[at])\n if (d[next] > d[at] + 1 && d[at] != q) {\n d[next] = d[at] + 1;\n if (have[next]) d[next] = 0;\n queue.add(next);\n }\n }\n return d[t] != Integer.MAX_VALUE;\n }\n\n BufferedReader reader;\n PrintWriter writer;\n StringTokenizer stk;\n\n void run() throws Exception {\n\n reader = new BufferedReader(new InputStreamReader(System.in));\n stk = null;\n writer = new PrintWriter(new PrintWriter(System.out));\n solve();\n reader.close();\n writer.close();\n }\n\n int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n\n long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n\n double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n\n String nextString() throws Exception {\n return nextToken();\n }\n\n String nextLine() throws Exception {\n return reader.readLine();\n }\n\n String nextToken() throws Exception {\n if (stk == null || !stk.hasMoreTokens()) {\n stk = new StringTokenizer(nextLine());\n return nextToken();\n }\n return stk.nextToken();\n }\n\n public static void main(String[] args) throws Exception {\n new Solution().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+\n import java.io.*;\n import java.util.*;\n \n-public class C {\n+public class Solution {\n+ int n;\n+ boolean[] have;\n+ Integer[][] g;\n+ int s, t;\n \n- BufferedReader br;\n- PrintWriter out;\n- StringTokenizer st;\n- boolean eof;\n+ void solve() throws Exception {\n \n- static final int INF = Integer.MAX_VALUE / 2;\n+ n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ have = new boolean[n];\n+ for (int i = 0; i < k; i++) have[nextInt() - 1] = true;\n+ ArrayList[] list = new ArrayList[n];\n+ for (int i = 0; i < n; i++) list[i] = new ArrayList();\n+ for (int i = 0; i < m; i++) {\n+ int a = nextInt() - 1;\n+ int b = nextInt() - 1;\n+ list[a].add(b);\n+ list[b].add(a);\n+ }\n+ g = new Integer[n][];\n+ for (int i = 0; i < n; i++) g[i] = list[i].toArray(new Integer[0]);\n+ s = nextInt() - 1;\n+ t = nextInt() - 1;\n+ int low = 0;\n+ int high = n + 2;\n+ while (high - low > 1) {\n+ int mid = (low + high) / 2;\n \n- ArrayList[] g;\n+ if (can(mid)) high = mid;\n+ else low = mid;\n+ }\n+ System.out.println(high == n + 2 ? -1 : high);\n+ }\n \n- int s, t;\n- int[] nearDist;\n- ArrayDeque q;\n- int[] d;\n- boolean[] inQueue;\n+ private boolean can(int q) {\n+ int[] d = new int[n];\n+ Queue queue = new LinkedList();\n+ for (int i = 0; i < n; i++) {\n+ d[i] = Integer.MAX_VALUE;\n+ }\n \n- boolean check(int max) {\n- Arrays.fill(d, INF);\n d[s] = 0;\n- q.add(s);\n- inQueue[s] = true;\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- inQueue[v] = false;\n- if (d[v] + nearDist[v] <= max && d[v] > nearDist[v]) d[v] = nearDist[v];\n- for (int to : g[v])\n- if (d[to] > d[v] + 1 && d[v] <= max) {\n- d[to] = d[v] + 1;\n- if (!inQueue[to]) {\n- inQueue[to] = true;\n- q.add(to);\n- }\n+ queue.add(s);\n+ while (queue.size() > 0 && d[t] == Integer.MAX_VALUE) {\n+ int at = queue.remove();\n+ for (int next : g[at])\n+ if (d[next] > d[at] + 1 && d[at] != q) {\n+ d[next] = d[at] + 1;\n+ if (have[next]) d[next] = 0;\n+ queue.add(next);\n }\n }\n- return d[t] <= max;\n+ return d[t] != Integer.MAX_VALUE;\n }\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ BufferedReader reader;\n+ PrintWriter writer;\n+ StringTokenizer stk;\n \n- int[] good = new int[k];\n- for (int i = 0; i < k; i++) good[i] = nextInt() - 1;\n+ void run() throws Exception {\n \n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n-\n- for (int i = 0; i < m; i++) {\n- int v1 = nextInt() - 1;\n- int v2 = nextInt() - 1;\n- g[v1].add(v2);\n- g[v2].add(v1);\n- }\n-\n- s = nextInt() - 1;\n- t = nextInt() - 1;\n-\n- nearDist = new int[n];\n-\n- Arrays.fill(nearDist, INF);\n-\n- q = new ArrayDeque();\n- inQueue = new boolean[n];\n- d = new int[n];\n-\n- for (int v : good) {\n-\n- nearDist[v] = 0;\n- q.add(v);\n- }\n-\n- while (!q.isEmpty()) {\n- int v = q.poll();\n- for (int to : g[v])\n- if (nearDist[to] > nearDist[v] + 1) {\n- nearDist[to] = nearDist[v] + 1;\n-\n- q.add(to);\n- }\n- }\n-\n- int l = 0;\n- int r = n;\n- while (l < r - 1) {\n- int mid = (l + r) >> 1;\n- if (check(mid)) r = mid;\n- else l = mid;\n- }\n-\n- if (r == n) out.println(-1);\n- else out.println(r);\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ stk = null;\n+ writer = new PrintWriter(new PrintWriter(System.out));\n+ solve();\n+ reader.close();\n+ writer.close();\n }\n \n- void inp() throws IOException {\n- br = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().inp();\n- }\n-\n- String nextToken() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- eof = true;\n- return null;\n- }\n- }\n- return st.nextToken();\n- }\n-\n- String nextString() {\n- try {\n- return br.readLine();\n- } catch (IOException e) {\n- eof = true;\n- return null;\n- }\n- }\n-\n- int nextInt() throws IOException {\n+ int nextInt() throws Exception {\n return Integer.parseInt(nextToken());\n }\n \n- long nextLong() throws IOException {\n+ long nextLong() throws Exception {\n return Long.parseLong(nextToken());\n }\n \n- double nextDouble() throws IOException {\n+ double nextDouble() throws Exception {\n return Double.parseDouble(nextToken());\n }\n+\n+ String nextString() throws Exception {\n+ return nextToken();\n+ }\n+\n+ String nextLine() throws Exception {\n+ return reader.readLine();\n+ }\n+\n+ String nextToken() throws Exception {\n+ if (stk == null || !stk.hasMoreTokens()) {\n+ stk = new StringTokenizer(nextLine());\n+ return nextToken();\n+ }\n+ return stk.nextToken();\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ new Solution().run();\n+ }\n }", "output": "SLOWER 0.0359", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0252, "pair_id": "java_9867_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedWriter;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.OutputStreamWriter;\n+import java.io.PrintWriter;\n+import java.io.Writer;\n import java.util.ArrayList;\n-import java.util.StringTokenizer;\n-\n-public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n-\n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- int[] par;\n- int[] rank;\n-\n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n- }\n- }\n-\n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n- }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class Main {\n+ public static void main(String[] args) throws IOException {\n+\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ OutputWriter out = new OutputWriter(outputStream);\n+\n+ int N = in.readInt();\n+ int M = in.readInt();\n+ int K = in.readInt();\n+\n+ int[] HH = IOUtils.readIntArray(in, K);\n+ boolean[] H = new boolean[N];\n+ for (int i = 0; i < K; i++) {\n+ int x = HH[i] - 1;\n+ H[x] = true;\n+ }\n+\n+ ArrayList[] adj = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+\n+ int[][] F = new int[2][M];\n+ IOUtils.readIntArrays(in, F[0], F[1]);\n+\n+ for (int k = 0; k < M; k++) {\n+ int i = F[0][k] - 1;\n+ int j = F[1][k] - 1;\n+\n+ adj[i].add(j);\n+ adj[j].add(i);\n+ }\n+\n+ int s = in.readInt() - 1;\n+ int e = in.readInt() - 1;\n+\n+ H[e] = true;\n+\n+ int[] p = new int[N];\n+ State[] q = new State[N + M + 10];\n+ for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n+\n+ int first = 0, last = 0;\n+ boolean[] v = new boolean[N];\n+\n+ int lo = 1, hi = N + 10;\n+ while (lo < hi) {\n+ int Q = (lo + hi) / 2;\n+\n+ for (int i = 0; i < N; i++) p[i] = i;\n+\n+ first = last = 0;\n+ Arrays.fill(v, false);\n+\n+ for (int i = 0; i < N; i++)\n+ if (H[i]) {\n+ q[last].i = i;\n+ q[last].d = 0;\n+ last = (last + 1) % q.length;\n+ v[i] = true;\n }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n+\n+ while (last != first) {\n+ State st = q[first];\n+ first = (first + 1) % q.length;\n+\n+ for (int j : adj[st.i]) {\n+ if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n+\n+ if (!v[j] && 2 * (st.d + 1) <= Q) {\n+ v[j] = true;\n+ q[last].i = j;\n+ q[last].d = st.d + 1;\n+ last = (last + 1) % q.length;\n }\n }\n }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n+\n+ if (Q % 2 != 0)\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i]) {\n+ if (v[i] && v[j]) union(i, j, p);\n }\n- }\n+\n+ if (find(s, p) == find(e, p)) hi = Q;\n+ else lo = Q + 1;\n+ }\n+\n+ if (lo > N) System.out.println(-1);\n+ else System.out.println(lo);\n+ }\n+\n+ static int find(int i, int[] p) {\n+ if (p[i] == i) return i;\n+ else return p[i] = find(p[i], p);\n+ }\n+\n+ static void union(int i, int j, int[] p) {\n+ p[find(j, p)] = find(i, p);\n+ }\n+}\n+\n+class State {\n+ int i, d;\n+\n+ public State(int ii, int di) {\n+ i = ii;\n+ d = di;\n+ }\n+}\n+\n+class DisjointSets {\n+ static int[] p, rank;\n+\n+ public DisjointSets(int n) {\n+ p = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) p[i] = i;\n+ }\n+\n+ static void create(int x) {\n+ p[x] = x;\n+ rank[x] = 0;\n+ }\n+\n+ static void union(int x, int y) {\n+ int px = find(x);\n+ int py = find(y);\n+ if (rank[px] > rank[py]) p[py] = px;\n+ else p[px] = py;\n+ if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n+ }\n+\n+ static int find(int x) {\n+ if (x != p[x]) p[x] = find(p[x]);\n+ return p[x];\n+ }\n+}\n+\n+class InputReader {\n+\n+ private InputStream stream;\n+ private byte[] buf = new byte[1024];\n+ private int curChar;\n+ private int numChars;\n+\n+ public InputReader(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n- }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n- }\n-\n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().run();\n- }\n-}\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ public int readInt() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ int sgn = 1;\n+ if (c == '-') {\n+ sgn = -1;\n+ c = read();\n+ }\n+ int res = 0;\n+ do {\n+ if (c < '0' || c > '9') throw new InputMismatchException();\n+ res *= 10;\n+ res += c - '0';\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res * sgn;\n+ }\n+\n+ public static boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+}\n+\n+class OutputWriter {\n+ private final PrintWriter writer;\n+\n+ public OutputWriter(OutputStream outputStream) {\n+ writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n+ }\n+\n+ public OutputWriter(Writer writer) {\n+ this.writer = new PrintWriter(writer);\n+ }\n+\n+ public void print(Object... objects) {\n+ for (int i = 0; i < objects.length; i++) {\n+ if (i != 0) writer.print(' ');\n+ writer.print(objects[i]);\n+ }\n+ }\n+\n+ public void printLine(Object... objects) {\n+ print(objects);\n+ writer.println();\n+ }\n+\n+ public void close() {\n+ writer.close();\n+ }\n+}\n+\n+class IOUtils {\n+\n+ public static int[] readIntArray(InputReader in, int size) {\n+ int[] array = new int[size];\n+ for (int i = 0; i < size; i++) array[i] = in.readInt();\n+ return array;\n+ }\n+\n+ public static void readIntArrays(InputReader in, int[]... arrays) {\n+ for (int i = 0; i < arrays[0].length; i++) {\n+ for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n+ }\n+ }\n+}", "output": "FASTER 3.7596", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.544, "pair_id": "java_9852_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedWriter;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.io.Writer;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class Main {\n public static void main(String[] args) throws IOException {\n\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n OutputWriter out = new OutputWriter(outputStream);\n\n int N = in.readInt();\n int M = in.readInt();\n int K = in.readInt();\n\n int[] HH = IOUtils.readIntArray(in, K);\n boolean[] H = new boolean[N];\n for (int i = 0; i < K; i++) {\n int x = HH[i] - 1;\n H[x] = true;\n }\n\n ArrayList[] adj = new ArrayList[N];\n for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n\n int[][] F = new int[2][M];\n IOUtils.readIntArrays(in, F[0], F[1]);\n\n for (int k = 0; k < M; k++) {\n int i = F[0][k] - 1;\n int j = F[1][k] - 1;\n\n adj[i].add(j);\n adj[j].add(i);\n }\n\n int s = in.readInt() - 1;\n int e = in.readInt() - 1;\n\n H[e] = true;\n\n int[] p = new int[N];\n State[] q = new State[N + M + 10];\n for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n\n int first = 0, last = 0;\n boolean[] v = new boolean[N];\n\n int lo = 1, hi = N + 10;\n while (lo < hi) {\n int Q = (lo + hi) / 2;\n\n for (int i = 0; i < N; i++) p[i] = i;\n\n first = last = 0;\n Arrays.fill(v, false);\n\n for (int i = 0; i < N; i++)\n if (H[i]) {\n q[last].i = i;\n q[last].d = 0;\n last = (last + 1) % q.length;\n v[i] = true;\n }\n\n while (last != first) {\n State st = q[first];\n first = (first + 1) % q.length;\n\n for (int j : adj[st.i]) {\n if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n\n if (!v[j] && 2 * (st.d + 1) <= Q) {\n v[j] = true;\n q[last].i = j;\n q[last].d = st.d + 1;\n last = (last + 1) % q.length;\n }\n }\n }\n\n if (Q % 2 != 0)\n for (int i = 0; i < N; i++)\n for (int j : adj[i]) {\n if (v[i] && v[j]) union(i, j, p);\n }\n\n if (find(s, p) == find(e, p)) hi = Q;\n else lo = Q + 1;\n }\n\n if (lo > N) System.out.println(-1);\n else System.out.println(lo);\n }\n\n static int find(int i, int[] p) {\n if (p[i] == i) return i;\n else return p[i] = find(p[i], p);\n }\n\n static void union(int i, int j, int[] p) {\n p[find(j, p)] = find(i, p);\n }\n}\n\nclass State {\n int i, d;\n\n public State(int ii, int di) {\n i = ii;\n d = di;\n }\n}\n\nclass DisjointSets {\n static int[] p, rank;\n\n public DisjointSets(int n) {\n p = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) p[i] = i;\n }\n\n static void create(int x) {\n p[x] = x;\n rank[x] = 0;\n }\n\n static void union(int x, int y) {\n int px = find(x);\n int py = find(y);\n if (rank[px] > rank[py]) p[py] = px;\n else p[px] = py;\n if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n }\n\n static int find(int x) {\n if (x != p[x]) p[x] = find(p[x]);\n return p[x];\n }\n}\n\nclass InputReader {\n\n private InputStream stream;\n private byte[] buf = new byte[1024];\n private int curChar;\n private int numChars;\n\n public InputReader(InputStream stream) {\n this.stream = stream;\n }\n\n public int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n public int readInt() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n int sgn = 1;\n if (c == '-') {\n sgn = -1;\n c = read();\n }\n int res = 0;\n do {\n if (c < '0' || c > '9') throw new InputMismatchException();\n res *= 10;\n res += c - '0';\n c = read();\n } while (!isSpaceChar(c));\n return res * sgn;\n }\n\n public static boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n}\n\nclass OutputWriter {\n private final PrintWriter writer;\n\n public OutputWriter(OutputStream outputStream) {\n writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n }\n\n public OutputWriter(Writer writer) {\n this.writer = new PrintWriter(writer);\n }\n\n public void print(Object... objects) {\n for (int i = 0; i < objects.length; i++) {\n if (i != 0) writer.print(' ');\n writer.print(objects[i]);\n }\n }\n\n public void printLine(Object... objects) {\n print(objects);\n writer.println();\n }\n\n public void close() {\n writer.close();\n }\n}\n\nclass IOUtils {\n\n public static int[] readIntArray(InputReader in, int size) {\n int[] array = new int[size];\n for (int i = 0; i < size; i++) array[i] = in.readInt();\n return array;\n }\n\n public static void readIntArrays(InputReader in, int[]... arrays) {\n for (int i = 0; i < arrays[0].length; i++) {\n for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedWriter;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.OutputStreamWriter;\n-import java.io.PrintWriter;\n-import java.io.Writer;\n+import java.io.*;\n import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n+import java.util.StringTokenizer;\n \n-public class Main {\n- public static void main(String[] args) throws IOException {\n+public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- OutputWriter out = new OutputWriter(outputStream);\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n+ }\n \n- int N = in.readInt();\n- int M = in.readInt();\n- int K = in.readInt();\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- int[] HH = IOUtils.readIntArray(in, K);\n- boolean[] H = new boolean[N];\n- for (int i = 0; i < K; i++) {\n- int x = HH[i] - 1;\n- H[x] = true;\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n }\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n+ }\n+ }\n \n- ArrayList[] adj = new ArrayList[N];\n- for (int i = 0; i < N; i++) adj[i] = new ArrayList();\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n \n- int[][] F = new int[2][M];\n- IOUtils.readIntArrays(in, F[0], F[1]);\n-\n- for (int k = 0; k < M; k++) {\n- int i = F[0][k] - 1;\n- int j = F[1][k] - 1;\n-\n- adj[i].add(j);\n- adj[j].add(i);\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n }\n-\n- int s = in.readInt() - 1;\n- int e = in.readInt() - 1;\n-\n- H[e] = true;\n-\n- int[] p = new int[N];\n- State[] q = new State[N + M + 10];\n- for (int i = 0; i < q.length; i++) q[i] = new State(0, 0);\n-\n- int first = 0, last = 0;\n- boolean[] v = new boolean[N];\n-\n- int lo = 1, hi = N + 10;\n- while (lo < hi) {\n- int Q = (lo + hi) / 2;\n-\n- for (int i = 0; i < N; i++) p[i] = i;\n-\n- first = last = 0;\n- Arrays.fill(v, false);\n-\n- for (int i = 0; i < N; i++)\n- if (H[i]) {\n- q[last].i = i;\n- q[last].d = 0;\n- last = (last + 1) % q.length;\n- v[i] = true;\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n+ }\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n+ }\n+ }\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n }\n-\n- while (last != first) {\n- State st = q[first];\n- first = (first + 1) % q.length;\n-\n- for (int j : adj[st.i]) {\n- if (2 * (st.d + 1) <= Q) union(st.i, j, p);\n-\n- if (!v[j] && 2 * (st.d + 1) <= Q) {\n- v[j] = true;\n- q[last].i = j;\n- q[last].d = st.d + 1;\n- last = (last + 1) % q.length;\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n-\n- if (Q % 2 != 0)\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i]) {\n- if (v[i] && v[j]) union(i, j, p);\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n }\n-\n- if (find(s, p) == find(e, p)) hi = Q;\n- else lo = Q + 1;\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n+ }\n }\n-\n- if (lo > N) System.out.println(-1);\n- else System.out.println(lo);\n- }\n-\n- static int find(int i, int[] p) {\n- if (p[i] == i) return i;\n- else return p[i] = find(p[i], p);\n- }\n-\n- static void union(int i, int j, int[] p) {\n- p[find(j, p)] = find(i, p);\n- }\n-}\n-\n-class State {\n- int i, d;\n-\n- public State(int ii, int di) {\n- i = ii;\n- d = di;\n- }\n-}\n-\n-class DisjointSets {\n- static int[] p, rank;\n-\n- public DisjointSets(int n) {\n- p = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) p[i] = i;\n- }\n-\n- static void create(int x) {\n- p[x] = x;\n- rank[x] = 0;\n- }\n-\n- static void union(int x, int y) {\n- int px = find(x);\n- int py = find(y);\n- if (rank[px] > rank[py]) p[py] = px;\n- else p[px] = py;\n- if (rank[px] == rank[py]) rank[py] = rank[py] + 1;\n- }\n-\n- static int find(int x) {\n- if (x != p[x]) p[x] = find(p[x]);\n- return p[x];\n- }\n-}\n-\n-class InputReader {\n-\n- private InputStream stream;\n- private byte[] buf = new byte[1024];\n- private int curChar;\n- private int numChars;\n-\n- public InputReader(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n- }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- public int readInt() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- int sgn = 1;\n- if (c == '-') {\n- sgn = -1;\n- c = read();\n- }\n- int res = 0;\n- do {\n- if (c < '0' || c > '9') throw new InputMismatchException();\n- res *= 10;\n- res += c - '0';\n- c = read();\n- } while (!isSpaceChar(c));\n- return res * sgn;\n- }\n-\n- public static boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-}\n-\n-class OutputWriter {\n- private final PrintWriter writer;\n-\n- public OutputWriter(OutputStream outputStream) {\n- writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));\n- }\n-\n- public OutputWriter(Writer writer) {\n- this.writer = new PrintWriter(writer);\n- }\n-\n- public void print(Object... objects) {\n- for (int i = 0; i < objects.length; i++) {\n- if (i != 0) writer.print(' ');\n- writer.print(objects[i]);\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n }\n }\n \n- public void printLine(Object... objects) {\n- print(objects);\n- writer.println();\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n }\n \n- public void close() {\n- writer.close();\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }\n-\n-class IOUtils {\n-\n- public static int[] readIntArray(InputReader in, int size) {\n- int[] array = new int[size];\n- for (int i = 0; i < size; i++) array[i] = in.readInt();\n- return array;\n- }\n-\n- public static void readIntArrays(InputReader in, int[]... arrays) {\n- for (int i = 0; i < arrays[0].length; i++) {\n- for (int j = 0; j < arrays.length; j++) arrays[j][i] = in.readInt();\n- }\n- }\n-}", "output": "SLOWER 3.7596", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.544, "pair_id": "java_9852_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.math.BigInteger;\n-import java.util.*;\n+import java.io.PrintStream;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-public class C implements Runnable {\n-\n- private static final String TASK_NAME_FOR_IO = \"\";\n-\n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n-\n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n+public class Round_119_C {\n public static void main(String[] args) {\n- new Thread(new C()).start();\n+ new Round_119_C().go();\n }\n \n int n;\n- boolean[] volunteer;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n \n- class VList {\n- List list = new LinkedList();\n+ int s;\n+ int t;\n+\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n }\n \n- VList[] e;\n- int src, dst;\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n+ }\n \n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n+ }\n \n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n \n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n }\n \n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n }\n \n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n+ boolean isEmpty() {\n+ return head == tail;\n }\n \n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n }\n \n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n- } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n+ int remove() {\n+ return queue[head++];\n }\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n- }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n-\n return false;\n }\n-\n- public void run() {\n- long timeStart = System.currentTimeMillis();\n-\n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n-\n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n- }\n }", "output": "FASTER 4.1518", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 17.7749, "pair_id": "java_9860_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.math.BigInteger;\n+import java.util.*;\n \n-public class Round_119_C {\n+public class C implements Runnable {\n+\n+ private static final String TASK_NAME_FOR_IO = \"\";\n+\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+\n+ BufferedReader in;\n+ PrintWriter out;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n+\n public static void main(String[] args) {\n- new Round_119_C().go();\n+ new Thread(new C()).start();\n }\n \n int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n+ boolean[] volunteer;\n \n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n+ class VList {\n+ List list = new LinkedList();\n }\n \n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n- }\n+ VList[] e;\n+ int src, dst;\n \n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n- }\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n \n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n- }\n- return lo < n ? lo : -1;\n- }\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n \n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n }\n \n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n }\n \n- boolean isEmpty() {\n- return head == tail;\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n }\n \n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n }\n \n- int remove() {\n- return queue[head++];\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n+\n+ if (!reachable(n)) {\n+\n+ out.print(\"-1\");\n+\n+ } else {\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n+ }\n+\n+ out.print(lo);\n }\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n+ }\n }\n+\n return false;\n }\n+\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n+\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n+\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ }\n+ }\n+\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n+ }\n+\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ private double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n }", "output": "SLOWER 4.1518", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 17.7749, "pair_id": "java_9860_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.io.PrintStream;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n-public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n-\n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n+public class Round_119_C {\n+ public static void main(String[] args) {\n+ new Round_119_C().go();\n }\n \n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n+ int n;\n+ int m;\n+ int k;\n+ boolean[] good;\n+ int[][] e;\n+ int[] ec;\n+\n+ int s;\n+ int t;\n+\n+ void go() {\n+\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ k = in.nextInt();\n+ allocate();\n+ for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n+ for (int i = 0; i < m; i++) {\n+ int u = in.nextInt() - 1;\n+ int v = in.nextInt() - 1;\n+ add(u, v);\n+ add(v, u);\n+ }\n+ s = in.nextInt() - 1;\n+ t = in.nextInt() - 1;\n+\n+ int result = solve();\n+\n+ PrintStream out = System.out;\n+ out.println(result);\n }\n \n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n+ void allocate() {\n+ good = new boolean[n];\n+ e = new int[n][2];\n+ ec = new int[n];\n }\n \n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ void add(int u, int v) {\n+ if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n+ e[u][ec[u]++] = v;\n }\n \n- int[] par;\n- int[] rank;\n+ int solve() {\n+ good[t] = true;\n+ q0 = new Q(n);\n+ q1 = new Q(n);\n+ gf = new boolean[n];\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int q = (lo + hi) / 2;\n+ if (can(q)) hi = q;\n+ else lo = q + 1;\n+ }\n+ return lo < n ? lo : -1;\n+ }\n \n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n+ static class Q {\n+ int[] queue;\n+ int[] dist;\n+ boolean[] f;\n+ int head;\n+ int tail;\n+\n+ public Q(int n) {\n+ queue = new int[n];\n+ dist = new int[n];\n+ f = new boolean[n];\n }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n+\n+ void clear() {\n+ for (int i = 0; i < tail; i++) f[queue[i]] = false;\n+ head = tail = 0;\n }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n- } else {\n- par[v1] = v2;\n+\n+ boolean isEmpty() {\n+ return head == tail;\n+ }\n+\n+ void add(int v, int d) {\n+ queue[tail++] = v;\n+ dist[v] = d;\n+ f[v] = true;\n+ }\n+\n+ int remove() {\n+ return queue[head++];\n }\n }\n \n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n+ Q q0;\n+ Q q1;\n+ boolean[] gf;\n \n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n- }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n+ private boolean can(int q) {\n+ Arrays.fill(gf, false);\n+ q0.clear();\n+ q0.add(s, 0);\n+ gf[s] = true;\n+ while (!q0.isEmpty()) {\n+ q1.clear();\n+ while (!q0.isEmpty()) {\n+ int u = q0.remove();\n+ int d = q0.dist[u] + 1;\n+ for (int i = 0; i < ec[u]; i++) {\n+ int v = e[u][i];\n+ if (!q0.f[v]) {\n+ if (good[v] && !gf[v]) {\n+ gf[v] = true;\n+ q1.add(v, 0);\n+ }\n+ if (d < q) q0.add(v, d);\n }\n }\n }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n+ if (gf[t]) return true;\n+ Q tmp = q0;\n+ q0 = q1;\n+ q1 = tmp;\n }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n- }\n-\n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().run();\n+ return false;\n }\n }", "output": "FASTER 3.7462", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.419, "pair_id": "java_9859_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintStream;\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Round_119_C {\n public static void main(String[] args) {\n new Round_119_C().go();\n }\n\n int n;\n int m;\n int k;\n boolean[] good;\n int[][] e;\n int[] ec;\n\n int s;\n int t;\n\n void go() {\n\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n k = in.nextInt();\n allocate();\n for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n for (int i = 0; i < m; i++) {\n int u = in.nextInt() - 1;\n int v = in.nextInt() - 1;\n add(u, v);\n add(v, u);\n }\n s = in.nextInt() - 1;\n t = in.nextInt() - 1;\n\n int result = solve();\n\n PrintStream out = System.out;\n out.println(result);\n }\n\n void allocate() {\n good = new boolean[n];\n e = new int[n][2];\n ec = new int[n];\n }\n\n void add(int u, int v) {\n if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n e[u][ec[u]++] = v;\n }\n\n int solve() {\n good[t] = true;\n q0 = new Q(n);\n q1 = new Q(n);\n gf = new boolean[n];\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int q = (lo + hi) / 2;\n if (can(q)) hi = q;\n else lo = q + 1;\n }\n return lo < n ? lo : -1;\n }\n\n static class Q {\n int[] queue;\n int[] dist;\n boolean[] f;\n int head;\n int tail;\n\n public Q(int n) {\n queue = new int[n];\n dist = new int[n];\n f = new boolean[n];\n }\n\n void clear() {\n for (int i = 0; i < tail; i++) f[queue[i]] = false;\n head = tail = 0;\n }\n\n boolean isEmpty() {\n return head == tail;\n }\n\n void add(int v, int d) {\n queue[tail++] = v;\n dist[v] = d;\n f[v] = true;\n }\n\n int remove() {\n return queue[head++];\n }\n }\n\n Q q0;\n Q q1;\n boolean[] gf;\n\n private boolean can(int q) {\n Arrays.fill(gf, false);\n q0.clear();\n q0.add(s, 0);\n gf[s] = true;\n while (!q0.isEmpty()) {\n q1.clear();\n while (!q0.isEmpty()) {\n int u = q0.remove();\n int d = q0.dist[u] + 1;\n for (int i = 0; i < ec[u]; i++) {\n int v = e[u][i];\n if (!q0.f[v]) {\n if (good[v] && !gf[v]) {\n gf[v] = true;\n q1.add(v, 0);\n }\n if (d < q) q0.add(v, d);\n }\n }\n }\n if (gf[t]) return true;\n Q tmp = q0;\n q0 = q1;\n q1 = tmp;\n }\n return false;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintStream;\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class Round_119_C {\n- public static void main(String[] args) {\n- new Round_119_C().go();\n+public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n+\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n }\n \n- int n;\n- int m;\n- int k;\n- boolean[] good;\n- int[][] e;\n- int[] ec;\n-\n- int s;\n- int t;\n-\n- void go() {\n-\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- k = in.nextInt();\n- allocate();\n- for (int i = 0; i < k; i++) good[in.nextInt() - 1] = true;\n- for (int i = 0; i < m; i++) {\n- int u = in.nextInt() - 1;\n- int v = in.nextInt() - 1;\n- add(u, v);\n- add(v, u);\n- }\n- s = in.nextInt() - 1;\n- t = in.nextInt() - 1;\n-\n- int result = solve();\n-\n- PrintStream out = System.out;\n- out.println(result);\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- void allocate() {\n- good = new boolean[n];\n- e = new int[n][2];\n- ec = new int[n];\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n }\n \n- void add(int u, int v) {\n- if (ec[u] >= e[u].length) e[u] = Arrays.copyOf(e[u], e[u].length * 2);\n- e[u][ec[u]++] = v;\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n \n- int solve() {\n- good[t] = true;\n- q0 = new Q(n);\n- q1 = new Q(n);\n- gf = new boolean[n];\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int q = (lo + hi) / 2;\n- if (can(q)) hi = q;\n- else lo = q + 1;\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n }\n- return lo < n ? lo : -1;\n- }\n-\n- static class Q {\n- int[] queue;\n- int[] dist;\n- boolean[] f;\n- int head;\n- int tail;\n-\n- public Q(int n) {\n- queue = new int[n];\n- dist = new int[n];\n- f = new boolean[n];\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n }\n-\n- void clear() {\n- for (int i = 0; i < tail; i++) f[queue[i]] = false;\n- head = tail = 0;\n- }\n-\n- boolean isEmpty() {\n- return head == tail;\n- }\n-\n- void add(int v, int d) {\n- queue[tail++] = v;\n- dist[v] = d;\n- f[v] = true;\n- }\n-\n- int remove() {\n- return queue[head++];\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n }\n }\n \n- Q q0;\n- Q q1;\n- boolean[] gf;\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n \n- private boolean can(int q) {\n- Arrays.fill(gf, false);\n- q0.clear();\n- q0.add(s, 0);\n- gf[s] = true;\n- while (!q0.isEmpty()) {\n- q1.clear();\n- while (!q0.isEmpty()) {\n- int u = q0.remove();\n- int d = q0.dist[u] + 1;\n- for (int i = 0; i < ec[u]; i++) {\n- int v = e[u][i];\n- if (!q0.f[v]) {\n- if (good[v] && !gf[v]) {\n- gf[v] = true;\n- q1.add(v, 0);\n- }\n- if (d < q) q0.add(v, d);\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n+ for (int i = 0; i < k; i++) {\n+ isup[nextInt() - 1] = 1;\n+ }\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ arr[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n+ }\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n+ int[] dist = new int[n];\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n+ }\n+ }\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n+ }\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n }\n }\n }\n- if (gf[t]) return true;\n- Q tmp = q0;\n- q0 = q1;\n- q1 = tmp;\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n+ }\n }\n- return false;\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n+ }\n+ }\n+\n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n+ out.close();\n+ }\n+\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }", "output": "SLOWER 3.7462", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.419, "pair_id": "java_9859_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import static java.util.Arrays.deepToString;\n+\n import java.io.*;\n-import java.math.BigInteger;\n+import java.math.*;\n import java.util.*;\n \n-public class C implements Runnable {\n+public class C {\n \n- private static final String TASK_NAME_FOR_IO = \"\";\n+ static int[] par;\n+ static int[] sz;\n \n- private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n- private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n+ static Random rng = new Random(58);\n \n- BufferedReader in;\n- PrintWriter out;\n- StringTokenizer tokenizer = new StringTokenizer(\"\");\n-\n- public static void main(String[] args) {\n- new Thread(new C()).start();\n- }\n-\n- int n;\n- boolean[] volunteer;\n-\n- class VList {\n- List list = new LinkedList();\n- }\n-\n- VList[] e;\n- int src, dst;\n-\n- LinkedList dQueue;\n- int[] dBest;\n- boolean[] inQueue;\n-\n- private void solve() throws IOException {\n- n = nextInt();\n- int m = nextInt();\n-\n- volunteer = new boolean[n];\n- int vCnt = nextInt();\n- for (int k = 0; k < vCnt; k++) {\n- int u = nextInt() - 1;\n- volunteer[u] = true;\n- }\n-\n- e = new VList[n];\n- for (int i = 0; i < n; i++) {\n- e[i] = new VList();\n- }\n-\n- for (int k = 0; k < m; k++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- e[u].list.add(v);\n- e[v].list.add(u);\n- }\n-\n- src = nextInt() - 1;\n- dst = nextInt() - 1;\n-\n- for (int i = 0; i < n; i++) {\n- Collections.reverse(e[i].list);\n- }\n-\n- dQueue = new LinkedList();\n- dBest = new int[n];\n- inQueue = new boolean[n];\n-\n- if (!reachable(n)) {\n-\n- out.print(\"-1\");\n-\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (sz[pu] <= sz[pv]) {\n+ par[pu] = pv;\n+ sz[pv] += sz[pu];\n } else {\n-\n- int lo = 1;\n- int hi = n;\n- while (lo < hi) {\n- int mid = (lo + hi) / 2;\n- if (reachable(mid)) {\n- hi = mid;\n- } else {\n- lo = mid + 1;\n- }\n- }\n-\n- out.print(lo);\n+ par[pv] = pu;\n+ sz[pu] += sz[pv];\n }\n }\n \n- private boolean reachable(int maxD) {\n- dQueue.clear();\n- Arrays.fill(dBest, Integer.MAX_VALUE);\n- Arrays.fill(inQueue, false);\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n \n- dBest[src] = 0;\n- dQueue.add(src);\n- inQueue[src] = true;\n-\n- while (!dQueue.isEmpty()) {\n- int u = dQueue.pollFirst();\n- inQueue[u] = false;\n-\n- for (int v : e[u].list) {\n- int nd = dBest[u] + 1;\n- if (nd > maxD) continue;\n- if (volunteer[v]) nd = 0;\n-\n- if (nd < dBest[v]) {\n- dBest[v] = nd;\n- if (!inQueue[v]) {\n- dQueue.add(v);\n- inQueue[v] = true;\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n+ for (int i = 0; i < k; i++) {\n+ vol[i] = nextInt() - 1;\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n+ }\n+ }\n+ }\n+ par = new int[k];\n+ sz = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ sz[i] = 1;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n-\n- if (dBest[dst] < Integer.MAX_VALUE) {\n- return true;\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n }\n }\n-\n- return false;\n+ writer.println(R != n ? R : -1);\n }\n \n- public void run() {\n- long timeStart = System.currentTimeMillis();\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n- try {\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n \n- if (fileIO) {\n- in = new BufferedReader(new FileReader(FILE_IN));\n- out = new PrintWriter(new FileWriter(FILE_OUT));\n- } else {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(new OutputStreamWriter(System.out));\n- }\n-\n- solve();\n-\n- in.close();\n- out.close();\n- } catch (IOException e) {\n- throw new IllegalStateException(e);\n- }\n- long timeEnd = System.currentTimeMillis();\n-\n- if (fileIO) {\n- System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n- }\n+ writer.close();\n }\n \n- private String nextToken() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- tokenizer = new StringTokenizer(line);\n- }\n- return tokenizer.nextToken();\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- private int nextInt() throws IOException {\n- return Integer.parseInt(nextToken());\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- private BigInteger nextBigInt() throws IOException {\n- return new BigInteger(nextToken());\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- private double nextDouble() throws IOException {\n- return Double.parseDouble(nextToken());\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 4.6242", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 24.6616, "pair_id": "java_9836_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n static int[] sz;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (sz[pu] <= sz[pv]) {\n par[pu] = pv;\n sz[pv] += sz[pu];\n } else {\n par[pv] = pu;\n sz[pu] += sz[pv];\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n sz = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n sz[i] = 1;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.math.BigInteger;\nimport java.util.*;\n\npublic class C implements Runnable {\n\n private static final String TASK_NAME_FOR_IO = \"\";\n\n private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n\n BufferedReader in;\n PrintWriter out;\n StringTokenizer tokenizer = new StringTokenizer(\"\");\n\n public static void main(String[] args) {\n new Thread(new C()).start();\n }\n\n int n;\n boolean[] volunteer;\n\n class VList {\n List list = new LinkedList();\n }\n\n VList[] e;\n int src, dst;\n\n LinkedList dQueue;\n int[] dBest;\n boolean[] inQueue;\n\n private void solve() throws IOException {\n n = nextInt();\n int m = nextInt();\n\n volunteer = new boolean[n];\n int vCnt = nextInt();\n for (int k = 0; k < vCnt; k++) {\n int u = nextInt() - 1;\n volunteer[u] = true;\n }\n\n e = new VList[n];\n for (int i = 0; i < n; i++) {\n e[i] = new VList();\n }\n\n for (int k = 0; k < m; k++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n e[u].list.add(v);\n e[v].list.add(u);\n }\n\n src = nextInt() - 1;\n dst = nextInt() - 1;\n\n for (int i = 0; i < n; i++) {\n Collections.reverse(e[i].list);\n }\n\n dQueue = new LinkedList();\n dBest = new int[n];\n inQueue = new boolean[n];\n\n if (!reachable(n)) {\n\n out.print(\"-1\");\n\n } else {\n\n int lo = 1;\n int hi = n;\n while (lo < hi) {\n int mid = (lo + hi) / 2;\n if (reachable(mid)) {\n hi = mid;\n } else {\n lo = mid + 1;\n }\n }\n\n out.print(lo);\n }\n }\n\n private boolean reachable(int maxD) {\n dQueue.clear();\n Arrays.fill(dBest, Integer.MAX_VALUE);\n Arrays.fill(inQueue, false);\n\n dBest[src] = 0;\n dQueue.add(src);\n inQueue[src] = true;\n\n while (!dQueue.isEmpty()) {\n int u = dQueue.pollFirst();\n inQueue[u] = false;\n\n for (int v : e[u].list) {\n int nd = dBest[u] + 1;\n if (nd > maxD) continue;\n if (volunteer[v]) nd = 0;\n\n if (nd < dBest[v]) {\n dBest[v] = nd;\n if (!inQueue[v]) {\n dQueue.add(v);\n inQueue[v] = true;\n }\n }\n }\n\n if (dBest[dst] < Integer.MAX_VALUE) {\n return true;\n }\n }\n\n return false;\n }\n\n public void run() {\n long timeStart = System.currentTimeMillis();\n\n boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n try {\n\n if (fileIO) {\n in = new BufferedReader(new FileReader(FILE_IN));\n out = new PrintWriter(new FileWriter(FILE_OUT));\n } else {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(new OutputStreamWriter(System.out));\n }\n\n solve();\n\n in.close();\n out.close();\n } catch (IOException e) {\n throw new IllegalStateException(e);\n }\n long timeEnd = System.currentTimeMillis();\n\n if (fileIO) {\n System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n }\n }\n\n private String nextToken() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n tokenizer = new StringTokenizer(line);\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws IOException {\n return Integer.parseInt(nextToken());\n }\n\n private BigInteger nextBigInt() throws IOException {\n return new BigInteger(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private double nextDouble() throws IOException {\n return Double.parseDouble(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n import java.io.*;\n-import java.math.*;\n+import java.math.BigInteger;\n import java.util.*;\n \n-public class C {\n+public class C implements Runnable {\n \n- static int[] par;\n- static int[] sz;\n+ private static final String TASK_NAME_FOR_IO = \"\";\n \n- static Random rng = new Random(58);\n+ private static final String FILE_IN = TASK_NAME_FOR_IO + \".in\";\n+ private static final String FILE_OUT = TASK_NAME_FOR_IO + \".out\";\n \n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (sz[pu] <= sz[pv]) {\n- par[pu] = pv;\n- sz[pv] += sz[pu];\n+ BufferedReader in;\n+ PrintWriter out;\n+ StringTokenizer tokenizer = new StringTokenizer(\"\");\n+\n+ public static void main(String[] args) {\n+ new Thread(new C()).start();\n+ }\n+\n+ int n;\n+ boolean[] volunteer;\n+\n+ class VList {\n+ List list = new LinkedList();\n+ }\n+\n+ VList[] e;\n+ int src, dst;\n+\n+ LinkedList dQueue;\n+ int[] dBest;\n+ boolean[] inQueue;\n+\n+ private void solve() throws IOException {\n+ n = nextInt();\n+ int m = nextInt();\n+\n+ volunteer = new boolean[n];\n+ int vCnt = nextInt();\n+ for (int k = 0; k < vCnt; k++) {\n+ int u = nextInt() - 1;\n+ volunteer[u] = true;\n+ }\n+\n+ e = new VList[n];\n+ for (int i = 0; i < n; i++) {\n+ e[i] = new VList();\n+ }\n+\n+ for (int k = 0; k < m; k++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ e[u].list.add(v);\n+ e[v].list.add(u);\n+ }\n+\n+ src = nextInt() - 1;\n+ dst = nextInt() - 1;\n+\n+ for (int i = 0; i < n; i++) {\n+ Collections.reverse(e[i].list);\n+ }\n+\n+ dQueue = new LinkedList();\n+ dBest = new int[n];\n+ inQueue = new boolean[n];\n+\n+ if (!reachable(n)) {\n+\n+ out.print(\"-1\");\n+\n } else {\n- par[pv] = pu;\n- sz[pu] += sz[pv];\n+\n+ int lo = 1;\n+ int hi = n;\n+ while (lo < hi) {\n+ int mid = (lo + hi) / 2;\n+ if (reachable(mid)) {\n+ hi = mid;\n+ } else {\n+ lo = mid + 1;\n+ }\n+ }\n+\n+ out.print(lo);\n }\n }\n \n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n+ private boolean reachable(int maxD) {\n+ dQueue.clear();\n+ Arrays.fill(dBest, Integer.MAX_VALUE);\n+ Arrays.fill(inQueue, false);\n \n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- sz = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- sz[i] = 1;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n+ dBest[src] = 0;\n+ dQueue.add(src);\n+ inQueue[src] = true;\n+\n+ while (!dQueue.isEmpty()) {\n+ int u = dQueue.pollFirst();\n+ inQueue[u] = false;\n+\n+ for (int v : e[u].list) {\n+ int nd = dBest[u] + 1;\n+ if (nd > maxD) continue;\n+ if (volunteer[v]) nd = 0;\n+\n+ if (nd < dBest[v]) {\n+ dBest[v] = nd;\n+ if (!inQueue[v]) {\n+ dQueue.add(v);\n+ inQueue[v] = true;\n }\n }\n }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n+\n+ if (dBest[dst] < Integer.MAX_VALUE) {\n+ return true;\n }\n }\n- writer.println(R != n ? R : -1);\n+\n+ return false;\n }\n \n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n+ public void run() {\n+ long timeStart = System.currentTimeMillis();\n \n- setTime();\n- solve();\n- printTime();\n- printMemory();\n+ boolean fileIO = TASK_NAME_FOR_IO.length() > 0;\n+ try {\n \n- writer.close();\n+ if (fileIO) {\n+ in = new BufferedReader(new FileReader(FILE_IN));\n+ out = new PrintWriter(new FileWriter(FILE_OUT));\n+ } else {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(new OutputStreamWriter(System.out));\n+ }\n+\n+ solve();\n+\n+ in.close();\n+ out.close();\n+ } catch (IOException e) {\n+ throw new IllegalStateException(e);\n+ }\n+ long timeEnd = System.currentTimeMillis();\n+\n+ if (fileIO) {\n+ System.out.println(\"Time spent: \" + (timeEnd - timeStart) + \" ms\");\n+ }\n }\n \n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n+ private String nextToken() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ tokenizer = new StringTokenizer(line);\n+ }\n+ return tokenizer.nextToken();\n }\n \n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n+ private int nextInt() throws IOException {\n+ return Integer.parseInt(nextToken());\n }\n \n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n+ private BigInteger nextBigInt() throws IOException {\n+ return new BigInteger(nextToken());\n }\n \n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n+ private long nextLong() throws IOException {\n+ return Long.parseLong(nextToken());\n }\n \n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n- try {\n- w = reader.readLine();\n- } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ private double nextDouble() throws IOException {\n+ return Double.parseDouble(nextToken());\n }\n }", "output": "SLOWER 4.6242", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 24.6616, "pair_id": "java_9836_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.Comparator;\n+import java.util.Arrays;\n import java.util.LinkedList;\n-import java.util.List;\n-import java.util.PriorityQueue;\n+import java.util.Locale;\n import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class Solver {\n+public class C {\n \n- public static void main(String[] Args) throws NumberFormatException, IOException {\n- new Solver().Run();\n+ class Edge {\n+ int to;\n+ int w;\n+\n+ Edge(int to, int w) {\n+ this.to = to;\n+ this.w = w;\n+ }\n }\n \n- PrintWriter pw;\n- StringTokenizer Stok;\n- BufferedReader br;\n+ private void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n \n- public String nextToken() throws IOException {\n- while (Stok == null || !Stok.hasMoreTokens()) {\n- Stok = new StringTokenizer(br.readLine());\n+ int[] dist = new int[n];\n+ int[] from = new int[n];\n+ int inf = Integer.MAX_VALUE / 10;\n+ Arrays.fill(dist, inf);\n+ Queue q = new LinkedList();\n+ for (int i = 0; i < k; i++) {\n+ int x = nextInt() - 1;\n+ q.add(x);\n+ from[x] = x;\n+ dist[x] = 0;\n }\n- return Stok.nextToken();\n+\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n+ }\n+\n+ int s = nextInt() - 1;\n+ int t = nextInt() - 1;\n+ q.add(t);\n+ from[t] = t;\n+ dist[t] = 0;\n+\n+ ArrayList[] g2 = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g2[i] = new ArrayList();\n+ }\n+\n+ while (!q.isEmpty()) {\n+ int u = q.poll();\n+ for (int v : g[u]) {\n+ if (dist[v] == inf) {\n+ dist[v] = dist[u] + 1;\n+ from[v] = from[u];\n+ q.add(v);\n+ } else {\n+ int w = dist[u] + dist[v] + 1;\n+ g2[from[u]].add(new Edge(from[v], w));\n+ g2[from[v]].add(new Edge(from[u], w));\n+ }\n+ }\n+ }\n+\n+ int l = 1;\n+ int r = n;\n+ int res = inf;\n+ int[] queue = new int[n];\n+ boolean[] used = new boolean[n];\n+ while (l <= r) {\n+ int x = (l + r) / 2;\n+\n+ int a = 0;\n+ int b = 1;\n+ queue[0] = s;\n+ Arrays.fill(used, false);\n+\n+ while (a != b) {\n+ int u = queue[a++];\n+ for (Edge e : g2[u]) {\n+ if (!used[e.to] && e.w <= x) {\n+ used[e.to] = true;\n+ queue[b++] = e.to;\n+ }\n+ }\n+ }\n+\n+ if (used[t]) {\n+ res = x;\n+ r = x - 1;\n+ } else {\n+ l = x + 1;\n+ }\n+ }\n+\n+ if (res == inf) {\n+ println(\"-1\");\n+ } else {\n+ println(res);\n+ }\n }\n \n- public int nextInt() throws NumberFormatException, IOException {\n+ private String nextToken() throws IOException {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n+ }\n+\n+ private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n \n- public double nextDouble() throws NumberFormatException, IOException {\n+ private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n \n- public long nextLong() throws NumberFormatException, IOException {\n+ private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n \n- class TCross {\n+ private void print(Object o) {\n+ writer.print(o);\n+ }\n \n- int numvol;\n- List con;\n- int len;\n+ private void println(Object o) {\n+ writer.println(o);\n+ }\n \n- public TCross() {\n- con = new ArrayList();\n- len = Integer.MAX_VALUE;\n- numvol = -1;\n+ private void printf(String format, Object... o) {\n+ writer.printf(format, o);\n+ }\n+\n+ public static void main(String[] args) {\n+ long time = System.currentTimeMillis();\n+ Locale.setDefault(Locale.US);\n+ new C().run();\n+ System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n+ }\n+\n+ BufferedReader reader;\n+ StringTokenizer tokenizer;\n+ PrintWriter writer;\n+\n+ private void run() {\n+ try {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n+ solve();\n+ reader.close();\n+ writer.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ System.exit(13);\n }\n }\n-\n- int n, m, k;\n- int[] vols;\n- TCross[] cross;\n- int start, fin;\n- boolean[] inQue;\n-\n- public int makeWave(Queue que, int maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return 0;\n- }\n- int curlen = -1;\n- TCross cur;\n- while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n- if (vols[k] != 0) {\n- que.clear();\n- return curlen;\n- }\n- cur = cross[que.poll()];\n- if (cur.len > curlen) curlen = cur.len;\n-\n- for (Integer next : cur.con) {\n- if (vols[k] == 0) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- vols[cross[next].numvol] = 1;\n- cross[next].len = 0;\n- Queue que2 = new LinkedList();\n- que2.add(next);\n- makeWave(que2, curlen);\n- que.addAll(que2);\n- } else que.add(next);\n- }\n- }\n- }\n- }\n- return curlen;\n- }\n-\n- public void Run() throws NumberFormatException, IOException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- pw = new PrintWriter(new OutputStreamWriter(System.out));\n- n = nextInt();\n- m = nextInt();\n- k = nextInt();\n- vols = new int[k + 1];\n- cross = new TCross[n];\n- for (int i = 0; i < n; i++) {\n- cross[i] = new TCross();\n- }\n-\n- int zn;\n- for (int i = 0; i < k; i++) {\n- zn = nextInt() - 1;\n- cross[zn].numvol = i;\n- }\n-\n- int zn2;\n- for (int i = 0; i < m; i++) {\n- zn = nextInt() - 1;\n- zn2 = nextInt() - 1;\n- cross[zn].con.add(zn2);\n- cross[zn2].con.add(zn);\n- }\n-\n- start = nextInt() - 1;\n- fin = nextInt() - 1;\n- cross[fin].numvol = k;\n- cross[start].len = 0;\n- vols[cross[start].numvol] = 1;\n- if (start == fin) {\n- pw.println(0);\n- pw.flush();\n- pw.close();\n- return;\n- }\n-\n- int maxZn = -1;\n- inQue = new boolean[n];\n- PriorityQueue que =\n- new PriorityQueue(\n- n,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return cross[o1].len - cross[o2].len;\n- }\n- });\n- que.add(start);\n- TCross cur;\n- while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n- cur = cross[que.poll()];\n- if (cur.len > maxZn) maxZn = cur.len;\n- for (Integer next : cur.con) {\n- if (cross[next].len > cur.len + 1) {\n- cross[next].len = cur.len + 1;\n- if (cross[next].numvol != -1) {\n- cross[next].len = 0;\n- }\n- que.add(next);\n- }\n- }\n- }\n- if (cross[fin].len == Integer.MAX_VALUE) {\n- pw.println(-1);\n- } else pw.println(maxZn + 1);\n-\n- pw.flush();\n- pw.close();\n- }\n }", "output": "FASTER 0.0226", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.0158, "pair_id": "java_9876_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.LinkedList;\nimport java.util.Locale;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class C {\n\n class Edge {\n int to;\n int w;\n\n Edge(int to, int w) {\n this.to = to;\n this.w = w;\n }\n }\n\n private void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n\n int[] dist = new int[n];\n int[] from = new int[n];\n int inf = Integer.MAX_VALUE / 10;\n Arrays.fill(dist, inf);\n Queue q = new LinkedList();\n for (int i = 0; i < k; i++) {\n int x = nextInt() - 1;\n q.add(x);\n from[x] = x;\n dist[x] = 0;\n }\n\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n\n int s = nextInt() - 1;\n int t = nextInt() - 1;\n q.add(t);\n from[t] = t;\n dist[t] = 0;\n\n ArrayList[] g2 = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g2[i] = new ArrayList();\n }\n\n while (!q.isEmpty()) {\n int u = q.poll();\n for (int v : g[u]) {\n if (dist[v] == inf) {\n dist[v] = dist[u] + 1;\n from[v] = from[u];\n q.add(v);\n } else {\n int w = dist[u] + dist[v] + 1;\n g2[from[u]].add(new Edge(from[v], w));\n g2[from[v]].add(new Edge(from[u], w));\n }\n }\n }\n\n int l = 1;\n int r = n;\n int res = inf;\n int[] queue = new int[n];\n boolean[] used = new boolean[n];\n while (l <= r) {\n int x = (l + r) / 2;\n\n int a = 0;\n int b = 1;\n queue[0] = s;\n Arrays.fill(used, false);\n\n while (a != b) {\n int u = queue[a++];\n for (Edge e : g2[u]) {\n if (!used[e.to] && e.w <= x) {\n used[e.to] = true;\n queue[b++] = e.to;\n }\n }\n }\n\n if (used[t]) {\n res = x;\n r = x - 1;\n } else {\n l = x + 1;\n }\n }\n\n if (res == inf) {\n println(\"-1\");\n } else {\n println(res);\n }\n }\n\n private String nextToken() throws IOException {\n while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n private int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n private double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n private long nextLong() throws IOException {\n return Long.parseLong(nextToken());\n }\n\n private void print(Object o) {\n writer.print(o);\n }\n\n private void println(Object o) {\n writer.println(o);\n }\n\n private void printf(String format, Object... o) {\n writer.printf(format, o);\n }\n\n public static void main(String[] args) {\n long time = System.currentTimeMillis();\n Locale.setDefault(Locale.US);\n new C().run();\n System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n }\n\n BufferedReader reader;\n StringTokenizer tokenizer;\n PrintWriter writer;\n\n private void run() {\n try {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n solve();\n reader.close();\n writer.close();\n } catch (IOException e) {\n e.printStackTrace();\n System.exit(13);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.OutputStreamWriter;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.LinkedList;\nimport java.util.List;\nimport java.util.PriorityQueue;\nimport java.util.Queue;\nimport java.util.StringTokenizer;\n\npublic class Solver {\n\n public static void main(String[] Args) throws NumberFormatException, IOException {\n new Solver().Run();\n }\n\n PrintWriter pw;\n StringTokenizer Stok;\n BufferedReader br;\n\n public String nextToken() throws IOException {\n while (Stok == null || !Stok.hasMoreTokens()) {\n Stok = new StringTokenizer(br.readLine());\n }\n return Stok.nextToken();\n }\n\n public int nextInt() throws NumberFormatException, IOException {\n return Integer.parseInt(nextToken());\n }\n\n public double nextDouble() throws NumberFormatException, IOException {\n return Double.parseDouble(nextToken());\n }\n\n public long nextLong() throws NumberFormatException, IOException {\n return Long.parseLong(nextToken());\n }\n\n class TCross {\n\n int numvol;\n List con;\n int len;\n\n public TCross() {\n con = new ArrayList();\n len = Integer.MAX_VALUE;\n numvol = -1;\n }\n }\n\n int n, m, k;\n int[] vols;\n TCross[] cross;\n int start, fin;\n boolean[] inQue;\n\n public int makeWave(Queue que, int maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return 0;\n }\n int curlen = -1;\n TCross cur;\n while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n if (vols[k] != 0) {\n que.clear();\n return curlen;\n }\n cur = cross[que.poll()];\n if (cur.len > curlen) curlen = cur.len;\n\n for (Integer next : cur.con) {\n if (vols[k] == 0) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n vols[cross[next].numvol] = 1;\n cross[next].len = 0;\n Queue que2 = new LinkedList();\n que2.add(next);\n makeWave(que2, curlen);\n que.addAll(que2);\n } else que.add(next);\n }\n }\n }\n }\n return curlen;\n }\n\n public void Run() throws NumberFormatException, IOException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n pw = new PrintWriter(new OutputStreamWriter(System.out));\n n = nextInt();\n m = nextInt();\n k = nextInt();\n vols = new int[k + 1];\n cross = new TCross[n];\n for (int i = 0; i < n; i++) {\n cross[i] = new TCross();\n }\n\n int zn;\n for (int i = 0; i < k; i++) {\n zn = nextInt() - 1;\n cross[zn].numvol = i;\n }\n\n int zn2;\n for (int i = 0; i < m; i++) {\n zn = nextInt() - 1;\n zn2 = nextInt() - 1;\n cross[zn].con.add(zn2);\n cross[zn2].con.add(zn);\n }\n\n start = nextInt() - 1;\n fin = nextInt() - 1;\n cross[fin].numvol = k;\n cross[start].len = 0;\n vols[cross[start].numvol] = 1;\n if (start == fin) {\n pw.println(0);\n pw.flush();\n pw.close();\n return;\n }\n\n int maxZn = -1;\n inQue = new boolean[n];\n PriorityQueue que =\n new PriorityQueue(\n n,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return cross[o1].len - cross[o2].len;\n }\n });\n que.add(start);\n TCross cur;\n while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n cur = cross[que.poll()];\n if (cur.len > maxZn) maxZn = cur.len;\n for (Integer next : cur.con) {\n if (cross[next].len > cur.len + 1) {\n cross[next].len = cur.len + 1;\n if (cross[next].numvol != -1) {\n cross[next].len = 0;\n }\n que.add(next);\n }\n }\n }\n if (cross[fin].len == Integer.MAX_VALUE) {\n pw.println(-1);\n } else pw.println(maxZn + 1);\n\n pw.flush();\n pw.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n+import java.io.OutputStreamWriter;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.Arrays;\n+import java.util.Comparator;\n import java.util.LinkedList;\n-import java.util.Locale;\n+import java.util.List;\n+import java.util.PriorityQueue;\n import java.util.Queue;\n import java.util.StringTokenizer;\n \n-public class C {\n+public class Solver {\n \n- class Edge {\n- int to;\n- int w;\n+ public static void main(String[] Args) throws NumberFormatException, IOException {\n+ new Solver().Run();\n+ }\n \n- Edge(int to, int w) {\n- this.to = to;\n- this.w = w;\n+ PrintWriter pw;\n+ StringTokenizer Stok;\n+ BufferedReader br;\n+\n+ public String nextToken() throws IOException {\n+ while (Stok == null || !Stok.hasMoreTokens()) {\n+ Stok = new StringTokenizer(br.readLine());\n+ }\n+ return Stok.nextToken();\n+ }\n+\n+ public int nextInt() throws NumberFormatException, IOException {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public double nextDouble() throws NumberFormatException, IOException {\n+ return Double.parseDouble(nextToken());\n+ }\n+\n+ public long nextLong() throws NumberFormatException, IOException {\n+ return Long.parseLong(nextToken());\n+ }\n+\n+ class TCross {\n+\n+ int numvol;\n+ List con;\n+ int len;\n+\n+ public TCross() {\n+ con = new ArrayList();\n+ len = Integer.MAX_VALUE;\n+ numvol = -1;\n }\n }\n \n- private void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n+ int n, m, k;\n+ int[] vols;\n+ TCross[] cross;\n+ int start, fin;\n+ boolean[] inQue;\n \n- int[] dist = new int[n];\n- int[] from = new int[n];\n- int inf = Integer.MAX_VALUE / 10;\n- Arrays.fill(dist, inf);\n- Queue q = new LinkedList();\n- for (int i = 0; i < k; i++) {\n- int x = nextInt() - 1;\n- q.add(x);\n- from[x] = x;\n- dist[x] = 0;\n+ public int makeWave(Queue que, int maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return 0;\n }\n+ int curlen = -1;\n+ TCross cur;\n+ while (!que.isEmpty() && cross[que.peek()].len <= maxlen) {\n+ if (vols[k] != 0) {\n+ que.clear();\n+ return curlen;\n+ }\n+ cur = cross[que.poll()];\n+ if (cur.len > curlen) curlen = cur.len;\n \n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n-\n- int s = nextInt() - 1;\n- int t = nextInt() - 1;\n- q.add(t);\n- from[t] = t;\n- dist[t] = 0;\n-\n- ArrayList[] g2 = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g2[i] = new ArrayList();\n- }\n-\n- while (!q.isEmpty()) {\n- int u = q.poll();\n- for (int v : g[u]) {\n- if (dist[v] == inf) {\n- dist[v] = dist[u] + 1;\n- from[v] = from[u];\n- q.add(v);\n- } else {\n- int w = dist[u] + dist[v] + 1;\n- g2[from[u]].add(new Edge(from[v], w));\n- g2[from[v]].add(new Edge(from[u], w));\n+ for (Integer next : cur.con) {\n+ if (vols[k] == 0) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ vols[cross[next].numvol] = 1;\n+ cross[next].len = 0;\n+ Queue que2 = new LinkedList();\n+ que2.add(next);\n+ makeWave(que2, curlen);\n+ que.addAll(que2);\n+ } else que.add(next);\n+ }\n }\n }\n }\n+ return curlen;\n+ }\n \n- int l = 1;\n- int r = n;\n- int res = inf;\n- int[] queue = new int[n];\n- boolean[] used = new boolean[n];\n- while (l <= r) {\n- int x = (l + r) / 2;\n+ public void Run() throws NumberFormatException, IOException {\n \n- int a = 0;\n- int b = 1;\n- queue[0] = s;\n- Arrays.fill(used, false);\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ n = nextInt();\n+ m = nextInt();\n+ k = nextInt();\n+ vols = new int[k + 1];\n+ cross = new TCross[n];\n+ for (int i = 0; i < n; i++) {\n+ cross[i] = new TCross();\n+ }\n \n- while (a != b) {\n- int u = queue[a++];\n- for (Edge e : g2[u]) {\n- if (!used[e.to] && e.w <= x) {\n- used[e.to] = true;\n- queue[b++] = e.to;\n+ int zn;\n+ for (int i = 0; i < k; i++) {\n+ zn = nextInt() - 1;\n+ cross[zn].numvol = i;\n+ }\n+\n+ int zn2;\n+ for (int i = 0; i < m; i++) {\n+ zn = nextInt() - 1;\n+ zn2 = nextInt() - 1;\n+ cross[zn].con.add(zn2);\n+ cross[zn2].con.add(zn);\n+ }\n+\n+ start = nextInt() - 1;\n+ fin = nextInt() - 1;\n+ cross[fin].numvol = k;\n+ cross[start].len = 0;\n+ vols[cross[start].numvol] = 1;\n+ if (start == fin) {\n+ pw.println(0);\n+ pw.flush();\n+ pw.close();\n+ return;\n+ }\n+\n+ int maxZn = -1;\n+ inQue = new boolean[n];\n+ PriorityQueue que =\n+ new PriorityQueue(\n+ n,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return cross[o1].len - cross[o2].len;\n+ }\n+ });\n+ que.add(start);\n+ TCross cur;\n+ while (!que.isEmpty() && cross[fin].len == Integer.MAX_VALUE) {\n+ cur = cross[que.poll()];\n+ if (cur.len > maxZn) maxZn = cur.len;\n+ for (Integer next : cur.con) {\n+ if (cross[next].len > cur.len + 1) {\n+ cross[next].len = cur.len + 1;\n+ if (cross[next].numvol != -1) {\n+ cross[next].len = 0;\n }\n+ que.add(next);\n }\n }\n+ }\n+ if (cross[fin].len == Integer.MAX_VALUE) {\n+ pw.println(-1);\n+ } else pw.println(maxZn + 1);\n \n- if (used[t]) {\n- res = x;\n- r = x - 1;\n- } else {\n- l = x + 1;\n- }\n- }\n-\n- if (res == inf) {\n- println(\"-1\");\n- } else {\n- println(res);\n- }\n- }\n-\n- private String nextToken() throws IOException {\n- while (tokenizer == null || !tokenizer.hasMoreTokens()) {\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- private int nextInt() throws NumberFormatException, IOException {\n- return Integer.parseInt(nextToken());\n- }\n-\n- private double nextDouble() throws NumberFormatException, IOException {\n- return Double.parseDouble(nextToken());\n- }\n-\n- private long nextLong() throws IOException {\n- return Long.parseLong(nextToken());\n- }\n-\n- private void print(Object o) {\n- writer.print(o);\n- }\n-\n- private void println(Object o) {\n- writer.println(o);\n- }\n-\n- private void printf(String format, Object... o) {\n- writer.printf(format, o);\n- }\n-\n- public static void main(String[] args) {\n- long time = System.currentTimeMillis();\n- Locale.setDefault(Locale.US);\n- new C().run();\n- System.err.printf(\"%.3f\\n\", 1e-3 * (System.currentTimeMillis() - time));\n- }\n-\n- BufferedReader reader;\n- StringTokenizer tokenizer;\n- PrintWriter writer;\n-\n- private void run() {\n- try {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n- solve();\n- reader.close();\n- writer.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- System.exit(13);\n- }\n+ pw.flush();\n+ pw.close();\n }\n }", "output": "SLOWER 0.0226", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.0158, "pair_id": "java_9876_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.PriorityQueue;\n-import java.util.StringTokenizer;\n+import static java.util.Arrays.deepToString;\n \n-public class C_Round_119_Div1 {\n+import java.io.*;\n+import java.math.*;\n+import java.util.*;\n \n- public static long MOD = 1000000007;\n+public class C {\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ static int[] par;\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n+ static Random rng = new Random(58);\n+\n+ static void unite(int u, int v) {\n+ int pu = parent(u), pv = parent(v);\n+ if (rng.nextBoolean()) {\n+ par[pu] = pv;\n+ } else {\n+ par[pv] = pu;\n+ }\n+ }\n+\n+ static int parent(int u) {\n+ return par[u] == u ? u : (par[u] = parent(par[u]));\n+ }\n+\n+ static void solve() {\n+ int n = nextInt(), m = nextInt(), k = nextInt();\n+ ArrayList[] g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ g[i] = new ArrayList<>(0);\n+ }\n+ int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n- }\n- ArrayList[] map = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n+ int u = nextInt() - 1, v = nextInt() - 1;\n+ g[u].add(v);\n+ g[v].add(u);\n }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n- int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n+ int s = nextInt() - 1, t = nextInt() - 1;\n+ int[] color = new int[n];\n+ int[] d = new int[n];\n+ Arrays.fill(d, Integer.MAX_VALUE);\n+ Arrays.fill(color, -1);\n+ LinkedList q = new LinkedList<>();\n+ int si = -1;\n+ for (int i = 0; i < k; i++) {\n+ color[vol[i]] = i;\n+ if (vol[i] == s) {\n+ si = i;\n+ }\n+ d[vol[i]] = 0;\n+ q.add(vol[i]);\n+ }\n+ if (si == -1) throw new AssertionError();\n+ while (!q.isEmpty()) {\n+ int u = q.poll(), col = color[u], dist = d[u];\n+ for (int v : g[u]) {\n+ if (color[v] == -1) {\n+ color[v] = col;\n+ d[v] = dist + 1;\n+ q.addLast(v);\n }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n }\n }\n- out.println(result);\n-\n- out.close();\n- }\n-\n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n-\n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n+ par = new int[k];\n+ int[] td = new int[n];\n+ int[] qq = new int[n];\n+ int L = 0, R = n;\n+ while (L + 1 < R) {\n+ int Q = (L + R) / 2;\n+ for (int i = 0; i < k; i++) {\n+ par[i] = i;\n+ }\n+ for (int u = 0; u < n; u++) {\n+ for (int v : g[u]) {\n+ if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n+ unite(color[u], color[v]);\n }\n }\n }\n+ int ql = 0, qr = 0;\n+ qq[qr++] = t;\n+ Arrays.fill(td, Integer.MAX_VALUE);\n+ td[t] = 0;\n+ while (ql < qr) {\n+ int u = qq[--qr];\n+ for (int v : g[u]) {\n+ if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n+ qq[qr++] = v;\n+ td[v] = td[u] + 1;\n+ }\n+ }\n+ }\n+ boolean ok = false;\n+ for (int i = 0; i < k; i++) {\n+ if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n+ ok = true;\n+ }\n+ }\n+ if (ok) {\n+ R = Q;\n+ } else {\n+ L = Q;\n+ }\n }\n- return dist[t] != -1;\n+ writer.println(R != n ? R : -1);\n }\n \n- static class Dist implements Comparable {\n+ public static void main(String[] args) throws Exception {\n+ reader = new BufferedReader(new InputStreamReader(System.in));\n+ writer = new PrintWriter(System.out);\n \n- int pos, max, nearest;\n+ setTime();\n+ solve();\n+ printTime();\n+ printMemory();\n \n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n+ writer.close();\n }\n \n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n+ static BufferedReader reader;\n+ static PrintWriter writer;\n+ static StringTokenizer tok = new StringTokenizer(\"\");\n+ static long systemTime;\n+\n+ static void debug(Object... o) {\n+ System.err.println(deepToString(o));\n }\n \n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n+ static void setTime() {\n+ systemTime = System.currentTimeMillis();\n }\n \n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n+ static void printTime() {\n+ System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n \n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n+ static void printMemory() {\n+ System.err.println(\n+ \"Memory consumed: \"\n+ + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n+ + \"kb\");\n }\n \n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n+ static String next() {\n+ while (!tok.hasMoreTokens()) {\n+ String w = null;\n+ try {\n+ w = reader.readLine();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ }\n+ if (w == null) return null;\n+ tok = new StringTokenizer(w);\n }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n+ return tok.nextToken();\n }\n \n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n+ static int nextInt() {\n+ return Integer.parseInt(next());\n }\n \n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n+ static long nextLong() {\n+ return Long.parseLong(next());\n }\n \n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n+ static double nextDouble() {\n+ return Double.parseDouble(next());\n }\n \n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ static BigInteger nextBigInteger() {\n+ return new BigInteger(next());\n }\n }", "output": "FASTER 3.7583", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 13.5323, "pair_id": "java_9839_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.util.Arrays.deepToString;\n\nimport java.io.*;\nimport java.math.*;\nimport java.util.*;\n\npublic class C {\n\n static int[] par;\n\n static Random rng = new Random(58);\n\n static void unite(int u, int v) {\n int pu = parent(u), pv = parent(v);\n if (rng.nextBoolean()) {\n par[pu] = pv;\n } else {\n par[pv] = pu;\n }\n }\n\n static int parent(int u) {\n return par[u] == u ? u : (par[u] = parent(par[u]));\n }\n\n static void solve() {\n int n = nextInt(), m = nextInt(), k = nextInt();\n ArrayList[] g = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n g[i] = new ArrayList<>(0);\n }\n int[] vol = new int[k];\n for (int i = 0; i < k; i++) {\n vol[i] = nextInt() - 1;\n }\n for (int i = 0; i < m; i++) {\n int u = nextInt() - 1, v = nextInt() - 1;\n g[u].add(v);\n g[v].add(u);\n }\n int s = nextInt() - 1, t = nextInt() - 1;\n int[] color = new int[n];\n int[] d = new int[n];\n Arrays.fill(d, Integer.MAX_VALUE);\n Arrays.fill(color, -1);\n LinkedList q = new LinkedList<>();\n int si = -1;\n for (int i = 0; i < k; i++) {\n color[vol[i]] = i;\n if (vol[i] == s) {\n si = i;\n }\n d[vol[i]] = 0;\n q.add(vol[i]);\n }\n if (si == -1) throw new AssertionError();\n while (!q.isEmpty()) {\n int u = q.poll(), col = color[u], dist = d[u];\n for (int v : g[u]) {\n if (color[v] == -1) {\n color[v] = col;\n d[v] = dist + 1;\n q.addLast(v);\n }\n }\n }\n par = new int[k];\n int[] td = new int[n];\n int[] qq = new int[n];\n int L = 0, R = n;\n while (L + 1 < R) {\n int Q = (L + R) / 2;\n for (int i = 0; i < k; i++) {\n par[i] = i;\n }\n for (int u = 0; u < n; u++) {\n for (int v : g[u]) {\n if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n unite(color[u], color[v]);\n }\n }\n }\n int ql = 0, qr = 0;\n qq[qr++] = t;\n Arrays.fill(td, Integer.MAX_VALUE);\n td[t] = 0;\n while (ql < qr) {\n int u = qq[--qr];\n for (int v : g[u]) {\n if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n qq[qr++] = v;\n td[v] = td[u] + 1;\n }\n }\n }\n boolean ok = false;\n for (int i = 0; i < k; i++) {\n if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n ok = true;\n }\n }\n if (ok) {\n R = Q;\n } else {\n L = Q;\n }\n }\n writer.println(R != n ? R : -1);\n }\n\n public static void main(String[] args) throws Exception {\n reader = new BufferedReader(new InputStreamReader(System.in));\n writer = new PrintWriter(System.out);\n\n setTime();\n solve();\n printTime();\n printMemory();\n\n writer.close();\n }\n\n static BufferedReader reader;\n static PrintWriter writer;\n static StringTokenizer tok = new StringTokenizer(\"\");\n static long systemTime;\n\n static void debug(Object... o) {\n System.err.println(deepToString(o));\n }\n\n static void setTime() {\n systemTime = System.currentTimeMillis();\n }\n\n static void printTime() {\n System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n }\n\n static void printMemory() {\n System.err.println(\n \"Memory consumed: \"\n + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n + \"kb\");\n }\n\n static String next() {\n while (!tok.hasMoreTokens()) {\n String w = null;\n try {\n w = reader.readLine();\n } catch (Exception e) {\n e.printStackTrace();\n }\n if (w == null) return null;\n tok = new StringTokenizer(w);\n }\n return tok.nextToken();\n }\n\n static int nextInt() {\n return Integer.parseInt(next());\n }\n\n static long nextLong() {\n return Long.parseLong(next());\n }\n\n static double nextDouble() {\n return Double.parseDouble(next());\n }\n\n static BigInteger nextBigInteger() {\n return new BigInteger(next());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.util.Arrays.deepToString;\n-\n-import java.io.*;\n-import java.math.*;\n-import java.util.*;\n-\n-public class C {\n-\n- static int[] par;\n-\n- static Random rng = new Random(58);\n-\n- static void unite(int u, int v) {\n- int pu = parent(u), pv = parent(v);\n- if (rng.nextBoolean()) {\n- par[pu] = pv;\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.PriorityQueue;\n+import java.util.StringTokenizer;\n+\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n+ }\n+ }\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n } else {\n- par[pv] = pu;\n- }\n- }\n-\n- static int parent(int u) {\n- return par[u] == u ? u : (par[u] = parent(par[u]));\n- }\n-\n- static void solve() {\n- int n = nextInt(), m = nextInt(), k = nextInt();\n- ArrayList[] g = new ArrayList[n];\n- for (int i = 0; i < n; i++) {\n- g[i] = new ArrayList<>(0);\n- }\n- int[] vol = new int[k];\n- for (int i = 0; i < k; i++) {\n- vol[i] = nextInt() - 1;\n- }\n- for (int i = 0; i < m; i++) {\n- int u = nextInt() - 1, v = nextInt() - 1;\n- g[u].add(v);\n- g[v].add(u);\n- }\n- int s = nextInt() - 1, t = nextInt() - 1;\n- int[] color = new int[n];\n- int[] d = new int[n];\n- Arrays.fill(d, Integer.MAX_VALUE);\n- Arrays.fill(color, -1);\n- LinkedList q = new LinkedList<>();\n- int si = -1;\n- for (int i = 0; i < k; i++) {\n- color[vol[i]] = i;\n- if (vol[i] == s) {\n- si = i;\n- }\n- d[vol[i]] = 0;\n- q.add(vol[i]);\n- }\n- if (si == -1) throw new AssertionError();\n- while (!q.isEmpty()) {\n- int u = q.poll(), col = color[u], dist = d[u];\n- for (int v : g[u]) {\n- if (color[v] == -1) {\n- color[v] = col;\n- d[v] = dist + 1;\n- q.addLast(v);\n- }\n- }\n- }\n- par = new int[k];\n- int[] td = new int[n];\n- int[] qq = new int[n];\n- int L = 0, R = n;\n- while (L + 1 < R) {\n- int Q = (L + R) / 2;\n- for (int i = 0; i < k; i++) {\n- par[i] = i;\n- }\n- for (int u = 0; u < n; u++) {\n- for (int v : g[u]) {\n- if (color[u] != color[v] && d[u] + d[v] + 1 <= Q) {\n- unite(color[u], color[v]);\n- }\n- }\n- }\n- int ql = 0, qr = 0;\n- qq[qr++] = t;\n- Arrays.fill(td, Integer.MAX_VALUE);\n- td[t] = 0;\n- while (ql < qr) {\n- int u = qq[--qr];\n- for (int v : g[u]) {\n- if (td[v] == Integer.MAX_VALUE && td[u] + 1 <= Q) {\n- qq[qr++] = v;\n- td[v] = td[u] + 1;\n- }\n- }\n- }\n- boolean ok = false;\n- for (int i = 0; i < k; i++) {\n- if (td[vol[i]] != Integer.MAX_VALUE && parent(i) == parent(si)) {\n- ok = true;\n- }\n- }\n- if (ok) {\n- R = Q;\n- } else {\n- L = Q;\n- }\n- }\n- writer.println(R != n ? R : -1);\n- }\n-\n- public static void main(String[] args) throws Exception {\n- reader = new BufferedReader(new InputStreamReader(System.in));\n- writer = new PrintWriter(System.out);\n-\n- setTime();\n- solve();\n- printTime();\n- printMemory();\n-\n- writer.close();\n- }\n-\n- static BufferedReader reader;\n- static PrintWriter writer;\n- static StringTokenizer tok = new StringTokenizer(\"\");\n- static long systemTime;\n-\n- static void debug(Object... o) {\n- System.err.println(deepToString(o));\n- }\n-\n- static void setTime() {\n- systemTime = System.currentTimeMillis();\n- }\n-\n- static void printTime() {\n- System.err.println(\"Time consumed: \" + (System.currentTimeMillis() - systemTime));\n- }\n-\n- static void printMemory() {\n- System.err.println(\n- \"Memory consumed: \"\n- + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000\n- + \"kb\");\n- }\n-\n- static String next() {\n- while (!tok.hasMoreTokens()) {\n- String w = null;\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n try {\n- w = reader.readLine();\n+ return br.readLine();\n } catch (Exception e) {\n- e.printStackTrace();\n- }\n- if (w == null) return null;\n- tok = new StringTokenizer(w);\n- }\n- return tok.nextToken();\n- }\n-\n- static int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- static long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- static double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- static BigInteger nextBigInteger() {\n- return new BigInteger(next());\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "SLOWER 3.7583", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 13.5323, "pair_id": "java_9839_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.FileNotFoundException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.PriorityQueue;\n import java.util.StringTokenizer;\n \n-public class C {\n- BufferedReader in;\n- StringTokenizer str;\n- PrintWriter out;\n- String SK;\n-\n- String next() throws IOException {\n- while ((str == null) || (!str.hasMoreTokens())) {\n- SK = in.readLine();\n- if (SK == null) return null;\n- str = new StringTokenizer(SK);\n- }\n- return str.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- int[] par;\n- int[] rank;\n-\n- void union(int v1, int v2) {\n- v1 = get(v1);\n- v2 = get(v2);\n- if (v1 == v2) {\n- return;\n- }\n- if (rank[v1] == rank[v2]) {\n- rank[v1]++;\n- }\n- if (rank[v1] > rank[v2]) {\n- par[v2] = v1;\n+public class C_Round_119_Div1 {\n+\n+ public static long MOD = 1000000007;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n+\n+ PrintWriter out = new PrintWriter(System.out);\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int k = in.nextInt();\n+ boolean[] check = new boolean[n];\n+ for (int i = 0; i < k; i++) {\n+ check[in.nextInt() - 1] = true;\n+ }\n+ ArrayList[] map = new ArrayList[n];\n+ for (int i = 0; i < n; i++) {\n+ map[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ map[a].add(b);\n+ map[b].add(a);\n+ }\n+ int s = in.nextInt() - 1;\n+ int t = in.nextInt() - 1;\n+ int st = 0;\n+ int ed = n;\n+ int result = -1;\n+ int[] dist = new int[n];\n+ PriorityQueue q = new PriorityQueue<>();\n+ while (st <= ed) {\n+ int mid = (st + ed) >> 1;\n+\n+ if (cal(mid, s, t, dist, check, map)) {\n+ if (result == -1 || result > mid) {\n+ result = mid;\n+ }\n+ ed = 0;\n+ for (int i : dist) {\n+ ed = Math.max(i, ed);\n+ }\n+ ed = Math.min(mid - 1, ed);\n+\n+ if (cal(ed, s, t, dist, check, map)) {\n+ if (result == -1 || result > ed) {\n+ result = ed;\n+ }\n+ ed = ed - 1;\n+ } else {\n+ st = ed + 1;\n+ ed = mid - 1;\n+ }\n+ } else {\n+ st = mid + 1;\n+ }\n+ }\n+ out.println(result);\n+\n+ out.close();\n+ }\n+\n+ public static boolean cal(\n+ int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n+ PriorityQueue q = new PriorityQueue<>();\n+\n+ Arrays.fill(dist, -1);\n+ dist[s] = 0;\n+ q.add(new Point(0, s));\n+ while (!q.isEmpty()) {\n+ Point p = q.poll();\n+ if (dist[p.y] == p.x && p.x + 1 <= mid) {\n+ for (int i : map[p.y]) {\n+ if (dist[i] == -1 || dist[i] > 1 + p.x) {\n+ dist[i] = 1 + p.x;\n+ if (check[i]) {\n+ dist[i] = 0;\n+ }\n+ q.add(new Point(dist[i], i));\n+ }\n+ }\n+ }\n+ }\n+ return dist[t] != -1;\n+ }\n+\n+ static class Dist implements Comparable {\n+\n+ int pos, max, nearest;\n+\n+ public Dist(int pos, int max, int nearest) {\n+ this.pos = pos;\n+ this.max = max;\n+ this.nearest = nearest;\n+ }\n+\n+ @Override\n+ public int compareTo(Dist o) {\n+ if (max != o.max) {\n+ return Integer.compare(max, o.max);\n+ }\n+ return Integer.compare(nearest, o.nearest);\n+ }\n+\n+ @Override\n+ public String toString() {\n+ return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n+ }\n+ }\n+\n+ public static int[] KMP(String val) {\n+ int i = 0;\n+ int j = -1;\n+ int[] result = new int[val.length() + 1];\n+ result[0] = -1;\n+ while (i < val.length()) {\n+ while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n+ j = result[j];\n+ }\n+ j++;\n+ i++;\n+ result[i] = j;\n+ }\n+ return result;\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ public static int digit(long n) {\n+ int result = 0;\n+ while (n > 0) {\n+ n /= 10;\n+ result++;\n+ }\n+ return result;\n+ }\n+\n+ public static double dist(long a, long b, long x, long y) {\n+ double val = (b - a) * (b - a) + (x - y) * (x - y);\n+ val = Math.sqrt(val);\n+ double other = x * x + a * a;\n+ other = Math.sqrt(other);\n+ return val + other;\n+ }\n+\n+ public static class Point implements Comparable {\n+\n+ int x, y;\n+\n+ public Point(int start, int end) {\n+ this.x = start;\n+ this.y = end;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int hash = 5;\n+ hash = 47 * hash + this.x;\n+ hash = 47 * hash + this.y;\n+ return hash;\n+ }\n+\n+ @Override\n+ public boolean equals(Object obj) {\n+ if (obj == null) {\n+ return false;\n+ }\n+ if (getClass() != obj.getClass()) {\n+ return false;\n+ }\n+ final Point other = (Point) obj;\n+ if (this.x != other.x) {\n+ return false;\n+ }\n+ if (this.y != other.y) {\n+ return false;\n+ }\n+ return true;\n+ }\n+\n+ @Override\n+ public int compareTo(Point o) {\n+ return x - o.x;\n+ }\n+ }\n+\n+ public static class FT {\n+\n+ long[] data;\n+\n+ FT(int n) {\n+ data = new long[n];\n+ }\n+\n+ public void update(int index, long value) {\n+ while (index < data.length) {\n+ data[index] += value;\n+ index += (index & (-index));\n+ }\n+ }\n+\n+ public long get(int index) {\n+ long result = 0;\n+ while (index > 0) {\n+ result += data[index];\n+ index -= (index & (-index));\n+ }\n+ return result;\n+ }\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n+ public static long pow(long a, long b) {\n+ if (b == 0) {\n+ return 1;\n+ }\n+ if (b == 1) {\n+ return a;\n+ }\n+ long val = pow(a, b / 2);\n+ if (b % 2 == 0) {\n+ return val * val % MOD;\n } else {\n- par[v1] = v2;\n- }\n- }\n-\n- int get(int v) {\n- return par[v] = (par[v] == v) ? v : get(par[v]);\n- }\n-\n- void solve() throws IOException {\n- int n = nextInt();\n- int m = nextInt();\n- int k = nextInt();\n- int[] isup = new int[n];\n- for (int i = 0; i < k; i++) {\n- isup[nextInt() - 1] = 1;\n- }\n- ArrayList[] arr = new ArrayList[n];\n- par = new int[n];\n- rank = new int[n];\n- for (int i = 0; i < n; i++) {\n- arr[i] = new ArrayList();\n- }\n- for (int i = 0; i < m; i++) {\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- arr[st].add(en);\n- arr[en].add(st);\n- }\n- int st = nextInt() - 1;\n- int en = nextInt() - 1;\n- isup[st] = 1;\n- isup[en] = 1;\n- int[] dist = new int[n];\n- int[] first = new int[n];\n- for (int i = 0; i < n; i++) {\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- first[i] = i;\n- }\n- }\n- if (st == en) {\n- out.println(0);\n- return;\n- }\n- int l = 0;\n- int r = n + 1;\n- int[] que = new int[n];\n- while (l < r - 1) {\n- int x = (l + r) / 2;\n- int hd = 0;\n- int tl = 0;\n- for (int i = 0; i < n; i++) {\n- par[i] = i;\n- rank[i] = 0;\n- if (isup[i] == 1) {\n- dist[i] = 1;\n- que[tl++] = i;\n- } else {\n- dist[i] = 0;\n- }\n- }\n- int up = x / 2;\n- while (hd != tl) {\n- int v = que[hd++];\n- if (dist[v] == up + 1) {\n- break;\n- }\n- for (int i : arr[v]) {\n- if (dist[i] == 0) {\n- dist[i] = dist[v] + 1;\n- first[i] = first[v];\n- que[tl++] = i;\n- } else {\n- union(first[i], first[v]);\n- }\n- }\n- }\n- if (x % 2 == 1) {\n- for (int i = 0; i < n; i++) {\n- for (int j : arr[i]) {\n- if (dist[i] > 0 && dist[j] > 0) {\n- union(first[i], first[j]);\n- }\n- }\n- }\n- }\n- if (get(st) == get(en)) {\n- r = x;\n- } else {\n- l = x;\n- }\n- }\n- if (r == n + 1) {\n- out.println(-1);\n- } else {\n- out.println(r);\n- }\n- }\n-\n- void run() throws IOException {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- solve();\n- out.close();\n- }\n-\n- public static void main(String[] args) throws IOException {\n- new C().run();\n+ return val * (val * a % MOD) % MOD;\n+ }\n+ }\n+\n+ static class Scanner {\n+\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+ return st.nextToken();\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n+ }\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n }\n }", "output": "FASTER 0.103", "problem_id": "189_E", "direction": "forward", "speedup_ratio": 1.074, "pair_id": "java_9865_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.PriorityQueue;\nimport java.util.StringTokenizer;\n\npublic class C_Round_119_Div1 {\n\n public static long MOD = 1000000007;\n\n public static void main(String[] args) throws FileNotFoundException {\n\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int m = in.nextInt();\n int k = in.nextInt();\n boolean[] check = new boolean[n];\n for (int i = 0; i < k; i++) {\n check[in.nextInt() - 1] = true;\n }\n ArrayList[] map = new ArrayList[n];\n for (int i = 0; i < n; i++) {\n map[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n map[a].add(b);\n map[b].add(a);\n }\n int s = in.nextInt() - 1;\n int t = in.nextInt() - 1;\n int st = 0;\n int ed = n;\n int result = -1;\n int[] dist = new int[n];\n PriorityQueue q = new PriorityQueue<>();\n while (st <= ed) {\n int mid = (st + ed) >> 1;\n\n if (cal(mid, s, t, dist, check, map)) {\n if (result == -1 || result > mid) {\n result = mid;\n }\n ed = 0;\n for (int i : dist) {\n ed = Math.max(i, ed);\n }\n ed = Math.min(mid - 1, ed);\n\n if (cal(ed, s, t, dist, check, map)) {\n if (result == -1 || result > ed) {\n result = ed;\n }\n ed = ed - 1;\n } else {\n st = ed + 1;\n ed = mid - 1;\n }\n } else {\n st = mid + 1;\n }\n }\n out.println(result);\n\n out.close();\n }\n\n public static boolean cal(\n int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n PriorityQueue q = new PriorityQueue<>();\n\n Arrays.fill(dist, -1);\n dist[s] = 0;\n q.add(new Point(0, s));\n while (!q.isEmpty()) {\n Point p = q.poll();\n if (dist[p.y] == p.x && p.x + 1 <= mid) {\n for (int i : map[p.y]) {\n if (dist[i] == -1 || dist[i] > 1 + p.x) {\n dist[i] = 1 + p.x;\n if (check[i]) {\n dist[i] = 0;\n }\n q.add(new Point(dist[i], i));\n }\n }\n }\n }\n return dist[t] != -1;\n }\n\n static class Dist implements Comparable {\n\n int pos, max, nearest;\n\n public Dist(int pos, int max, int nearest) {\n this.pos = pos;\n this.max = max;\n this.nearest = nearest;\n }\n\n @Override\n public int compareTo(Dist o) {\n if (max != o.max) {\n return Integer.compare(max, o.max);\n }\n return Integer.compare(nearest, o.nearest);\n }\n\n @Override\n public String toString() {\n return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n }\n }\n\n public static int[] KMP(String val) {\n int i = 0;\n int j = -1;\n int[] result = new int[val.length() + 1];\n result[0] = -1;\n while (i < val.length()) {\n while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n j = result[j];\n }\n j++;\n i++;\n result[i] = j;\n }\n return result;\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n public static int digit(long n) {\n int result = 0;\n while (n > 0) {\n n /= 10;\n result++;\n }\n return result;\n }\n\n public static double dist(long a, long b, long x, long y) {\n double val = (b - a) * (b - a) + (x - y) * (x - y);\n val = Math.sqrt(val);\n double other = x * x + a * a;\n other = Math.sqrt(other);\n return val + other;\n }\n\n public static class Point implements Comparable {\n\n int x, y;\n\n public Point(int start, int end) {\n this.x = start;\n this.y = end;\n }\n\n @Override\n public int hashCode() {\n int hash = 5;\n hash = 47 * hash + this.x;\n hash = 47 * hash + this.y;\n return hash;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (obj == null) {\n return false;\n }\n if (getClass() != obj.getClass()) {\n return false;\n }\n final Point other = (Point) obj;\n if (this.x != other.x) {\n return false;\n }\n if (this.y != other.y) {\n return false;\n }\n return true;\n }\n\n @Override\n public int compareTo(Point o) {\n return x - o.x;\n }\n }\n\n public static class FT {\n\n long[] data;\n\n FT(int n) {\n data = new long[n];\n }\n\n public void update(int index, long value) {\n while (index < data.length) {\n data[index] += value;\n index += (index & (-index));\n }\n }\n\n public long get(int index) {\n long result = 0;\n while (index > 0) {\n result += data[index];\n index -= (index & (-index));\n }\n return result;\n }\n }\n\n public static long gcd(long a, long b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n public static long pow(long a, long b) {\n if (b == 0) {\n return 1;\n }\n if (b == 1) {\n return a;\n }\n long val = pow(a, b / 2);\n if (b % 2 == 0) {\n return val * val % MOD;\n } else {\n return val * (val * a % MOD) % MOD;\n }\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class C {\n BufferedReader in;\n StringTokenizer str;\n PrintWriter out;\n String SK;\n\n String next() throws IOException {\n while ((str == null) || (!str.hasMoreTokens())) {\n SK = in.readLine();\n if (SK == null) return null;\n str = new StringTokenizer(SK);\n }\n return str.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n int[] par;\n int[] rank;\n\n void union(int v1, int v2) {\n v1 = get(v1);\n v2 = get(v2);\n if (v1 == v2) {\n return;\n }\n if (rank[v1] == rank[v2]) {\n rank[v1]++;\n }\n if (rank[v1] > rank[v2]) {\n par[v2] = v1;\n } else {\n par[v1] = v2;\n }\n }\n\n int get(int v) {\n return par[v] = (par[v] == v) ? v : get(par[v]);\n }\n\n void solve() throws IOException {\n int n = nextInt();\n int m = nextInt();\n int k = nextInt();\n int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n isup[nextInt() - 1] = 1;\n }\n ArrayList[] arr = new ArrayList[n];\n par = new int[n];\n rank = new int[n];\n for (int i = 0; i < n; i++) {\n arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n arr[st].add(en);\n arr[en].add(st);\n }\n int st = nextInt() - 1;\n int en = nextInt() - 1;\n isup[st] = 1;\n isup[en] = 1;\n int[] dist = new int[n];\n int[] first = new int[n];\n for (int i = 0; i < n; i++) {\n if (isup[i] == 1) {\n dist[i] = 1;\n first[i] = i;\n }\n }\n if (st == en) {\n out.println(0);\n return;\n }\n int l = 0;\n int r = n + 1;\n int[] que = new int[n];\n while (l < r - 1) {\n int x = (l + r) / 2;\n int hd = 0;\n int tl = 0;\n for (int i = 0; i < n; i++) {\n par[i] = i;\n rank[i] = 0;\n if (isup[i] == 1) {\n dist[i] = 1;\n que[tl++] = i;\n } else {\n dist[i] = 0;\n }\n }\n int up = x / 2;\n while (hd != tl) {\n int v = que[hd++];\n if (dist[v] == up + 1) {\n break;\n }\n for (int i : arr[v]) {\n if (dist[i] == 0) {\n dist[i] = dist[v] + 1;\n first[i] = first[v];\n que[tl++] = i;\n } else {\n union(first[i], first[v]);\n }\n }\n }\n if (x % 2 == 1) {\n for (int i = 0; i < n; i++) {\n for (int j : arr[i]) {\n if (dist[i] > 0 && dist[j] > 0) {\n union(first[i], first[j]);\n }\n }\n }\n }\n if (get(st) == get(en)) {\n r = x;\n } else {\n l = x;\n }\n }\n if (r == n + 1) {\n out.println(-1);\n } else {\n out.println(r);\n }\n }\n\n void run() throws IOException {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n solve();\n out.close();\n }\n\n public static void main(String[] args) throws IOException {\n new C().run();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.PriorityQueue;\n import java.util.StringTokenizer;\n \n-public class C_Round_119_Div1 {\n+public class C {\n+ BufferedReader in;\n+ StringTokenizer str;\n+ PrintWriter out;\n+ String SK;\n \n- public static long MOD = 1000000007;\n+ String next() throws IOException {\n+ while ((str == null) || (!str.hasMoreTokens())) {\n+ SK = in.readLine();\n+ if (SK == null) return null;\n+ str = new StringTokenizer(SK);\n+ }\n+ return str.nextToken();\n+ }\n \n- public static void main(String[] args) throws FileNotFoundException {\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n \n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int k = in.nextInt();\n- boolean[] check = new boolean[n];\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ int[] par;\n+ int[] rank;\n+\n+ void union(int v1, int v2) {\n+ v1 = get(v1);\n+ v2 = get(v2);\n+ if (v1 == v2) {\n+ return;\n+ }\n+ if (rank[v1] == rank[v2]) {\n+ rank[v1]++;\n+ }\n+ if (rank[v1] > rank[v2]) {\n+ par[v2] = v1;\n+ } else {\n+ par[v1] = v2;\n+ }\n+ }\n+\n+ int get(int v) {\n+ return par[v] = (par[v] == v) ? v : get(par[v]);\n+ }\n+\n+ void solve() throws IOException {\n+ int n = nextInt();\n+ int m = nextInt();\n+ int k = nextInt();\n+ int[] isup = new int[n];\n for (int i = 0; i < k; i++) {\n- check[in.nextInt() - 1] = true;\n+ isup[nextInt() - 1] = 1;\n }\n- ArrayList[] map = new ArrayList[n];\n+ ArrayList[] arr = new ArrayList[n];\n+ par = new int[n];\n+ rank = new int[n];\n for (int i = 0; i < n; i++) {\n- map[i] = new ArrayList();\n+ arr[i] = new ArrayList();\n }\n for (int i = 0; i < m; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- map[a].add(b);\n- map[b].add(a);\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ arr[st].add(en);\n+ arr[en].add(st);\n }\n- int s = in.nextInt() - 1;\n- int t = in.nextInt() - 1;\n- int st = 0;\n- int ed = n;\n- int result = -1;\n+ int st = nextInt() - 1;\n+ int en = nextInt() - 1;\n+ isup[st] = 1;\n+ isup[en] = 1;\n int[] dist = new int[n];\n- PriorityQueue q = new PriorityQueue<>();\n- while (st <= ed) {\n- int mid = (st + ed) >> 1;\n-\n- if (cal(mid, s, t, dist, check, map)) {\n- if (result == -1 || result > mid) {\n- result = mid;\n- }\n- ed = 0;\n- for (int i : dist) {\n- ed = Math.max(i, ed);\n- }\n- ed = Math.min(mid - 1, ed);\n-\n- if (cal(ed, s, t, dist, check, map)) {\n- if (result == -1 || result > ed) {\n- result = ed;\n- }\n- ed = ed - 1;\n- } else {\n- st = ed + 1;\n- ed = mid - 1;\n- }\n- } else {\n- st = mid + 1;\n+ int[] first = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ first[i] = i;\n }\n }\n- out.println(result);\n+ if (st == en) {\n+ out.println(0);\n+ return;\n+ }\n+ int l = 0;\n+ int r = n + 1;\n+ int[] que = new int[n];\n+ while (l < r - 1) {\n+ int x = (l + r) / 2;\n+ int hd = 0;\n+ int tl = 0;\n+ for (int i = 0; i < n; i++) {\n+ par[i] = i;\n+ rank[i] = 0;\n+ if (isup[i] == 1) {\n+ dist[i] = 1;\n+ que[tl++] = i;\n+ } else {\n+ dist[i] = 0;\n+ }\n+ }\n+ int up = x / 2;\n+ while (hd != tl) {\n+ int v = que[hd++];\n+ if (dist[v] == up + 1) {\n+ break;\n+ }\n+ for (int i : arr[v]) {\n+ if (dist[i] == 0) {\n+ dist[i] = dist[v] + 1;\n+ first[i] = first[v];\n+ que[tl++] = i;\n+ } else {\n+ union(first[i], first[v]);\n+ }\n+ }\n+ }\n+ if (x % 2 == 1) {\n+ for (int i = 0; i < n; i++) {\n+ for (int j : arr[i]) {\n+ if (dist[i] > 0 && dist[j] > 0) {\n+ union(first[i], first[j]);\n+ }\n+ }\n+ }\n+ }\n+ if (get(st) == get(en)) {\n+ r = x;\n+ } else {\n+ l = x;\n+ }\n+ }\n+ if (r == n + 1) {\n+ out.println(-1);\n+ } else {\n+ out.println(r);\n+ }\n+ }\n \n+ void run() throws IOException {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ solve();\n out.close();\n }\n \n- public static boolean cal(\n- int mid, int s, int t, int[] dist, boolean[] check, ArrayList[] map) {\n- PriorityQueue q = new PriorityQueue<>();\n-\n- Arrays.fill(dist, -1);\n- dist[s] = 0;\n- q.add(new Point(0, s));\n- while (!q.isEmpty()) {\n- Point p = q.poll();\n- if (dist[p.y] == p.x && p.x + 1 <= mid) {\n- for (int i : map[p.y]) {\n- if (dist[i] == -1 || dist[i] > 1 + p.x) {\n- dist[i] = 1 + p.x;\n- if (check[i]) {\n- dist[i] = 0;\n- }\n- q.add(new Point(dist[i], i));\n- }\n- }\n- }\n- }\n- return dist[t] != -1;\n- }\n-\n- static class Dist implements Comparable {\n-\n- int pos, max, nearest;\n-\n- public Dist(int pos, int max, int nearest) {\n- this.pos = pos;\n- this.max = max;\n- this.nearest = nearest;\n- }\n-\n- @Override\n- public int compareTo(Dist o) {\n- if (max != o.max) {\n- return Integer.compare(max, o.max);\n- }\n- return Integer.compare(nearest, o.nearest);\n- }\n-\n- @Override\n- public String toString() {\n- return \"Dist{\" + \"pos=\" + pos + \", max=\" + max + \", nearest=\" + nearest + '}';\n- }\n- }\n-\n- public static int[] KMP(String val) {\n- int i = 0;\n- int j = -1;\n- int[] result = new int[val.length() + 1];\n- result[0] = -1;\n- while (i < val.length()) {\n- while (j >= 0 && val.charAt(j) != val.charAt(i)) {\n- j = result[j];\n- }\n- j++;\n- i++;\n- result[i] = j;\n- }\n- return result;\n- }\n-\n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n- }\n-\n- public static int digit(long n) {\n- int result = 0;\n- while (n > 0) {\n- n /= 10;\n- result++;\n- }\n- return result;\n- }\n-\n- public static double dist(long a, long b, long x, long y) {\n- double val = (b - a) * (b - a) + (x - y) * (x - y);\n- val = Math.sqrt(val);\n- double other = x * x + a * a;\n- other = Math.sqrt(other);\n- return val + other;\n- }\n-\n- public static class Point implements Comparable {\n-\n- int x, y;\n-\n- public Point(int start, int end) {\n- this.x = start;\n- this.y = end;\n- }\n-\n- @Override\n- public int hashCode() {\n- int hash = 5;\n- hash = 47 * hash + this.x;\n- hash = 47 * hash + this.y;\n- return hash;\n- }\n-\n- @Override\n- public boolean equals(Object obj) {\n- if (obj == null) {\n- return false;\n- }\n- if (getClass() != obj.getClass()) {\n- return false;\n- }\n- final Point other = (Point) obj;\n- if (this.x != other.x) {\n- return false;\n- }\n- if (this.y != other.y) {\n- return false;\n- }\n- return true;\n- }\n-\n- @Override\n- public int compareTo(Point o) {\n- return x - o.x;\n- }\n- }\n-\n- public static class FT {\n-\n- long[] data;\n-\n- FT(int n) {\n- data = new long[n];\n- }\n-\n- public void update(int index, long value) {\n- while (index < data.length) {\n- data[index] += value;\n- index += (index & (-index));\n- }\n- }\n-\n- public long get(int index) {\n- long result = 0;\n- while (index > 0) {\n- result += data[index];\n- index -= (index & (-index));\n- }\n- return result;\n- }\n- }\n-\n- public static long gcd(long a, long b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n- }\n-\n- public static long pow(long a, long b) {\n- if (b == 0) {\n- return 1;\n- }\n- if (b == 1) {\n- return a;\n- }\n- long val = pow(a, b / 2);\n- if (b % 2 == 0) {\n- return val * val % MOD;\n- } else {\n- return val * (val * a % MOD) % MOD;\n- }\n- }\n-\n- static class Scanner {\n-\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n- }\n-\n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ public static void main(String[] args) throws IOException {\n+ new C().run();\n }\n }", "output": "SLOWER 0.103", "problem_id": "189_E", "direction": "reversed", "speedup_ratio": 1.074, "pair_id": "java_9865_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.List;\n+import java.util.Locale;\n import java.util.Scanner;\n \n-public class Main {\n+public class Zuma {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n+ Scanner in = new Scanner(System.in);\n+ in.useLocale(Locale.US);\n+\n+ int n, k, x;\n+ int result = 0, cur_result = 0;\n+ int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n+ n = in.nextInt();\n+ k = in.nextInt();\n+ x = in.nextInt();\n+ int balls[] = new int[n];\n+ boolean destroying = false;\n+ for (int i = 0; i < n; i++) {\n+ balls[i] = in.nextInt();\n+ }\n+ cur_balls = 0;\n+ for (int i = 0; i < n; i++) {\n+ if (balls[i] == x) {\n+ cur_balls++;\n+ continue;\n+ }\n+ if (cur_balls >= 2) {\n+ cur_balls_r = 0;\n+ cur_balls_l = 0;\n+ balls_r = 0;\n+ balls_l = cur_balls;\n+ destroying = true;\n+ while (destroying) {\n+ destroying = false;\n+ if (i - balls_l - 1 >= 0) {\n+ cur_color = balls[i - balls_l - 1];\n+ for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n+ if (balls[jl] == cur_color) cur_balls_l++;\n+ else break;\n+ }\n+ }\n+ if (i + balls_r < n) {\n+ if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n+ for (int jr = i + balls_r; jr < n; jr++) {\n+ if (balls[jr] == cur_color) cur_balls_r++;\n+ else break;\n+ }\n+ }\n+ if (cur_balls_l + cur_balls_r >= 3) {\n+ balls_r += cur_balls_r;\n+ balls_l += cur_balls_l;\n+ cur_balls_l = 0;\n+ cur_balls_r = 0;\n+ destroying = true;\n+ }\n+ }\n+ if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n+ else cur_result = 2;\n+ result = Math.max(result, cur_result);\n+ cur_result = 0;\n+ }\n+ cur_balls = 0;\n+ }\n+ System.out.println(result);\n+ in.close();\n }\n }\n-\n-class TaskB {\n- public int process(List lst) {\n- int res = 0;\n- boolean is_chang = true;\n- while (is_chang) {\n- is_chang = false;\n- for (int i = 0; i < lst.size(); i++) {\n- int cur = 0;\n- while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n- cur++;\n- }\n-\n- if (cur >= 3) {\n- is_chang = true;\n- for (int z = 0; z < cur; z++) {\n- lst.remove(i);\n- }\n- res += cur;\n- break;\n- }\n- }\n- }\n- return res;\n- }\n-\n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- List lst = new ArrayList();\n- int n = in.nextInt();\n- int k = in.nextInt();\n- int c = in.nextInt();\n- for (int i = 0; i < n; i++) {\n- lst.add(in.nextInt());\n- }\n-\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- List nw = new ArrayList();\n- for (int j = 0; j < n; j++) {\n- if (j == i) {\n- nw.add(c);\n- }\n- nw.add(lst.get(j));\n- }\n-\n- int res = process(nw);\n- if (res > max) {\n- max = res;\n- }\n- }\n- if (max > 0) {\n- max--;\n- }\n- out.print(max);\n- }\n-}", "output": "FASTER 0.2529", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.1916, "pair_id": "java_550_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Locale;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class Zuma {\n-\n+public class Main {\n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- in.useLocale(Locale.US);\n-\n- int n, k, x;\n- int result = 0, cur_result = 0;\n- int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n- n = in.nextInt();\n- k = in.nextInt();\n- x = in.nextInt();\n- int balls[] = new int[n];\n- boolean destroying = false;\n- for (int i = 0; i < n; i++) {\n- balls[i] = in.nextInt();\n- }\n- cur_balls = 0;\n- for (int i = 0; i < n; i++) {\n- if (balls[i] == x) {\n- cur_balls++;\n- continue;\n- }\n- if (cur_balls >= 2) {\n- cur_balls_r = 0;\n- cur_balls_l = 0;\n- balls_r = 0;\n- balls_l = cur_balls;\n- destroying = true;\n- while (destroying) {\n- destroying = false;\n- if (i - balls_l - 1 >= 0) {\n- cur_color = balls[i - balls_l - 1];\n- for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n- if (balls[jl] == cur_color) cur_balls_l++;\n- else break;\n- }\n- }\n- if (i + balls_r < n) {\n- if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n- for (int jr = i + balls_r; jr < n; jr++) {\n- if (balls[jr] == cur_color) cur_balls_r++;\n- else break;\n- }\n- }\n- if (cur_balls_l + cur_balls_r >= 3) {\n- balls_r += cur_balls_r;\n- balls_l += cur_balls_l;\n- cur_balls_l = 0;\n- cur_balls_r = 0;\n- destroying = true;\n- }\n- }\n- if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n- else cur_result = 2;\n- result = Math.max(result, cur_result);\n- cur_result = 0;\n- }\n- cur_balls = 0;\n- }\n- System.out.println(result);\n- in.close();\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n }\n+\n+class TaskB {\n+ public int process(List lst) {\n+ int res = 0;\n+ boolean is_chang = true;\n+ while (is_chang) {\n+ is_chang = false;\n+ for (int i = 0; i < lst.size(); i++) {\n+ int cur = 0;\n+ while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n+ cur++;\n+ }\n+\n+ if (cur >= 3) {\n+ is_chang = true;\n+ for (int z = 0; z < cur; z++) {\n+ lst.remove(i);\n+ }\n+ res += cur;\n+ break;\n+ }\n+ }\n+ }\n+ return res;\n+ }\n+\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ List lst = new ArrayList();\n+ int n = in.nextInt();\n+ int k = in.nextInt();\n+ int c = in.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ lst.add(in.nextInt());\n+ }\n+\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ List nw = new ArrayList();\n+ for (int j = 0; j < n; j++) {\n+ if (j == i) {\n+ nw.add(c);\n+ }\n+ nw.add(lst.get(j));\n+ }\n+\n+ int res = process(nw);\n+ if (res > max) {\n+ max = res;\n+ }\n+ }\n+ if (max > 0) {\n+ max--;\n+ }\n+ out.print(max);\n+ }\n+}", "output": "SLOWER 0.2529", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.1916, "pair_id": "java_550_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n+public class B430 {\n+\n+ public static int length;\n+ public static int[] line;\n+\n+ public static int destroy(int min, int max) {\n+ if (min < 0 || max >= length || line[min] != line[max]) return 0;\n+\n+ int cnt = 0;\n+ int color = line[min];\n+\n+ while (min >= 0 && line[min] == color) {\n+ min--;\n+ cnt++;\n+ }\n+ while (max < length && color == line[max]) {\n+ max++;\n+ cnt++;\n+ }\n+ if (cnt >= 3) return cnt + destroy(min, max);\n+ return 0;\n+ }\n \n public static void main(String[] args) {\n \n- Scanner cin = new Scanner(System.in);\n- int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n- int[] a = new int[110], b = new int[110];\n- for (int i = 0; i < n; i++) {\n- a[i] = cin.nextInt();\n- }\n- for (int i = 0; i + 1 < n; i++) {\n- if (a[i] == x && a[i + 1] == x) {\n- top = 0;\n- for (int j = 0; j < n; j++) {\n- if (j == i + 1) top--;\n- else if (top < 2) b[++top] = a[j];\n- else if (b[top] == b[top - 1] && b[top] == a[j]) {\n- while (j + 1 < n && a[j + 1] == b[top]) j++;\n- top -= 2;\n- } else b[++top] = a[j];\n- }\n- ans = ans > top ? top : ans;\n+ int colors, given;\n+\n+ Scanner s = new Scanner(System.in);\n+ length = s.nextInt();\n+ colors = s.nextInt();\n+ given = s.nextInt();\n+ line = new int[length];\n+ int max = 0;\n+\n+ for (int i = 0; i < length; i++) line[i] = s.nextInt();\n+\n+ for (int i = 0; i < length - 1; i++) {\n+ if (line[i] == given && line[i + 1] == given) {\n+ max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n- if (ans == 110) ans = n;\n- System.out.println(n - ans);\n-\n- System.out.println();\n+ System.out.println(max);\n }\n }", "output": "FASTER 0.0256", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.0179, "pair_id": "java_551_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class B430 {\n-\n- public static int length;\n- public static int[] line;\n-\n- public static int destroy(int min, int max) {\n- if (min < 0 || max >= length || line[min] != line[max]) return 0;\n-\n- int cnt = 0;\n- int color = line[min];\n-\n- while (min >= 0 && line[min] == color) {\n- min--;\n- cnt++;\n- }\n- while (max < length && color == line[max]) {\n- max++;\n- cnt++;\n- }\n- if (cnt >= 3) return cnt + destroy(min, max);\n- return 0;\n- }\n+public class Main {\n \n public static void main(String[] args) {\n \n- int colors, given;\n-\n- Scanner s = new Scanner(System.in);\n- length = s.nextInt();\n- colors = s.nextInt();\n- given = s.nextInt();\n- line = new int[length];\n- int max = 0;\n-\n- for (int i = 0; i < length; i++) line[i] = s.nextInt();\n-\n- for (int i = 0; i < length - 1; i++) {\n- if (line[i] == given && line[i + 1] == given) {\n- max = Math.max(max, 2 + destroy(i - 1, i + 2));\n+ Scanner cin = new Scanner(System.in);\n+ int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n+ int[] a = new int[110], b = new int[110];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = cin.nextInt();\n+ }\n+ for (int i = 0; i + 1 < n; i++) {\n+ if (a[i] == x && a[i + 1] == x) {\n+ top = 0;\n+ for (int j = 0; j < n; j++) {\n+ if (j == i + 1) top--;\n+ else if (top < 2) b[++top] = a[j];\n+ else if (b[top] == b[top - 1] && b[top] == a[j]) {\n+ while (j + 1 < n && a[j + 1] == b[top]) j++;\n+ top -= 2;\n+ } else b[++top] = a[j];\n+ }\n+ ans = ans > top ? top : ans;\n }\n }\n- System.out.println(max);\n+ if (ans == 110) ans = n;\n+ System.out.println(n - ans);\n+\n+ System.out.println();\n }\n }", "output": "SLOWER 0.0256", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.0179, "pair_id": "java_551_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n+\n+ Scanner cin = new Scanner(System.in);\n+ int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n+ int[] a = new int[110], b = new int[110];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = cin.nextInt();\n+ }\n+ for (int i = 0; i + 1 < n; i++) {\n+ if (a[i] == x && a[i + 1] == x) {\n+ top = 0;\n+ for (int j = 0; j < n; j++) {\n+ if (j == i + 1) top--;\n+ else if (top < 2) b[++top] = a[j];\n+ else if (b[top] == b[top - 1] && b[top] == a[j]) {\n+ while (j + 1 < n && a[j + 1] == b[top]) j++;\n+ top -= 2;\n+ } else b[++top] = a[j];\n+ }\n+ ans = ans > top ? top : ans;\n+ }\n+ }\n+ if (ans == 110) ans = n;\n+ System.out.println(n - ans);\n+\n+ System.out.println();\n }\n }\n-\n-class TaskB {\n- public int process(List lst) {\n- int res = 0;\n- boolean is_chang = true;\n- while (is_chang) {\n- is_chang = false;\n- for (int i = 0; i < lst.size(); i++) {\n- int cur = 0;\n- while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n- cur++;\n- }\n-\n- if (cur >= 3) {\n- is_chang = true;\n- for (int z = 0; z < cur; z++) {\n- lst.remove(i);\n- }\n- res += cur;\n- break;\n- }\n- }\n- }\n- return res;\n- }\n-\n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- List lst = new ArrayList();\n- int n = in.nextInt();\n- int k = in.nextInt();\n- int c = in.nextInt();\n- for (int i = 0; i < n; i++) {\n- lst.add(in.nextInt());\n- }\n-\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- List nw = new ArrayList();\n- for (int j = 0; j < n; j++) {\n- if (j == i) {\n- nw.add(c);\n- }\n- nw.add(lst.get(j));\n- }\n-\n- int res = process(nw);\n- if (res > max) {\n- max = res;\n- }\n- }\n- if (max > 0) {\n- max--;\n- }\n- out.print(max);\n- }\n-}", "output": "FASTER 0.1912", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.1417, "pair_id": "java_553_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+}\n \n- public static void main(String[] args) {\n+class TaskB {\n+ public int process(List lst) {\n+ int res = 0;\n+ boolean is_chang = true;\n+ while (is_chang) {\n+ is_chang = false;\n+ for (int i = 0; i < lst.size(); i++) {\n+ int cur = 0;\n+ while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n+ cur++;\n+ }\n \n- Scanner cin = new Scanner(System.in);\n- int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n- int[] a = new int[110], b = new int[110];\n- for (int i = 0; i < n; i++) {\n- a[i] = cin.nextInt();\n- }\n- for (int i = 0; i + 1 < n; i++) {\n- if (a[i] == x && a[i + 1] == x) {\n- top = 0;\n- for (int j = 0; j < n; j++) {\n- if (j == i + 1) top--;\n- else if (top < 2) b[++top] = a[j];\n- else if (b[top] == b[top - 1] && b[top] == a[j]) {\n- while (j + 1 < n && a[j + 1] == b[top]) j++;\n- top -= 2;\n- } else b[++top] = a[j];\n+ if (cur >= 3) {\n+ is_chang = true;\n+ for (int z = 0; z < cur; z++) {\n+ lst.remove(i);\n+ }\n+ res += cur;\n+ break;\n }\n- ans = ans > top ? top : ans;\n }\n }\n- if (ans == 110) ans = n;\n- System.out.println(n - ans);\n+ return res;\n+ }\n \n- System.out.println();\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ List lst = new ArrayList();\n+ int n = in.nextInt();\n+ int k = in.nextInt();\n+ int c = in.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ lst.add(in.nextInt());\n+ }\n+\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ List nw = new ArrayList();\n+ for (int j = 0; j < n; j++) {\n+ if (j == i) {\n+ nw.add(c);\n+ }\n+ nw.add(lst.get(j));\n+ }\n+\n+ int res = process(nw);\n+ if (res > max) {\n+ max = res;\n+ }\n+ }\n+ if (max > 0) {\n+ max--;\n+ }\n+ out.print(max);\n }\n }", "output": "SLOWER 0.1912", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.1417, "pair_id": "java_553_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Locale;\n+import java.util.Scanner;\n \n-public class B430 {\n-\n- public static int length;\n- public static int[] line;\n-\n- public static int destroy(int min, int max) {\n- if (min < 0 || max >= length || line[min] != line[max]) return 0;\n-\n- int cnt = 0;\n- int color = line[min];\n-\n- while (min >= 0 && line[min] == color) {\n- min--;\n- cnt++;\n- }\n- while (max < length && color == line[max]) {\n- max++;\n- cnt++;\n- }\n- if (cnt >= 3) return cnt + destroy(min, max);\n- return 0;\n- }\n+public class Zuma {\n \n public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ in.useLocale(Locale.US);\n \n- int colors, given;\n-\n- Scanner s = new Scanner(System.in);\n- length = s.nextInt();\n- colors = s.nextInt();\n- given = s.nextInt();\n- line = new int[length];\n- int max = 0;\n-\n- for (int i = 0; i < length; i++) line[i] = s.nextInt();\n-\n- for (int i = 0; i < length - 1; i++) {\n- if (line[i] == given && line[i + 1] == given) {\n- max = Math.max(max, 2 + destroy(i - 1, i + 2));\n+ int n, k, x;\n+ int result = 0, cur_result = 0;\n+ int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n+ n = in.nextInt();\n+ k = in.nextInt();\n+ x = in.nextInt();\n+ int balls[] = new int[n];\n+ boolean destroying = false;\n+ for (int i = 0; i < n; i++) {\n+ balls[i] = in.nextInt();\n+ }\n+ cur_balls = 0;\n+ for (int i = 0; i < n; i++) {\n+ if (balls[i] == x) {\n+ cur_balls++;\n+ continue;\n }\n+ if (cur_balls >= 2) {\n+ cur_balls_r = 0;\n+ cur_balls_l = 0;\n+ balls_r = 0;\n+ balls_l = cur_balls;\n+ destroying = true;\n+ while (destroying) {\n+ destroying = false;\n+ if (i - balls_l - 1 >= 0) {\n+ cur_color = balls[i - balls_l - 1];\n+ for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n+ if (balls[jl] == cur_color) cur_balls_l++;\n+ else break;\n+ }\n+ }\n+ if (i + balls_r < n) {\n+ if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n+ for (int jr = i + balls_r; jr < n; jr++) {\n+ if (balls[jr] == cur_color) cur_balls_r++;\n+ else break;\n+ }\n+ }\n+ if (cur_balls_l + cur_balls_r >= 3) {\n+ balls_r += cur_balls_r;\n+ balls_l += cur_balls_l;\n+ cur_balls_l = 0;\n+ cur_balls_r = 0;\n+ destroying = true;\n+ }\n+ }\n+ if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n+ else cur_result = 2;\n+ result = Math.max(result, cur_result);\n+ cur_result = 0;\n+ }\n+ cur_balls = 0;\n }\n- System.out.println(max);\n+ System.out.println(result);\n+ in.close();\n }\n }", "output": "FASTER 0.0362", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.0254, "pair_id": "java_548_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Locale;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Zuma {\n+public class B430 {\n+\n+ public static int length;\n+ public static int[] line;\n+\n+ public static int destroy(int min, int max) {\n+ if (min < 0 || max >= length || line[min] != line[max]) return 0;\n+\n+ int cnt = 0;\n+ int color = line[min];\n+\n+ while (min >= 0 && line[min] == color) {\n+ min--;\n+ cnt++;\n+ }\n+ while (max < length && color == line[max]) {\n+ max++;\n+ cnt++;\n+ }\n+ if (cnt >= 3) return cnt + destroy(min, max);\n+ return 0;\n+ }\n \n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- in.useLocale(Locale.US);\n \n- int n, k, x;\n- int result = 0, cur_result = 0;\n- int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n- n = in.nextInt();\n- k = in.nextInt();\n- x = in.nextInt();\n- int balls[] = new int[n];\n- boolean destroying = false;\n- for (int i = 0; i < n; i++) {\n- balls[i] = in.nextInt();\n+ int colors, given;\n+\n+ Scanner s = new Scanner(System.in);\n+ length = s.nextInt();\n+ colors = s.nextInt();\n+ given = s.nextInt();\n+ line = new int[length];\n+ int max = 0;\n+\n+ for (int i = 0; i < length; i++) line[i] = s.nextInt();\n+\n+ for (int i = 0; i < length - 1; i++) {\n+ if (line[i] == given && line[i + 1] == given) {\n+ max = Math.max(max, 2 + destroy(i - 1, i + 2));\n+ }\n }\n- cur_balls = 0;\n- for (int i = 0; i < n; i++) {\n- if (balls[i] == x) {\n- cur_balls++;\n- continue;\n- }\n- if (cur_balls >= 2) {\n- cur_balls_r = 0;\n- cur_balls_l = 0;\n- balls_r = 0;\n- balls_l = cur_balls;\n- destroying = true;\n- while (destroying) {\n- destroying = false;\n- if (i - balls_l - 1 >= 0) {\n- cur_color = balls[i - balls_l - 1];\n- for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n- if (balls[jl] == cur_color) cur_balls_l++;\n- else break;\n- }\n- }\n- if (i + balls_r < n) {\n- if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n- for (int jr = i + balls_r; jr < n; jr++) {\n- if (balls[jr] == cur_color) cur_balls_r++;\n- else break;\n- }\n- }\n- if (cur_balls_l + cur_balls_r >= 3) {\n- balls_r += cur_balls_r;\n- balls_l += cur_balls_l;\n- cur_balls_l = 0;\n- cur_balls_r = 0;\n- destroying = true;\n- }\n- }\n- if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n- else cur_result = 2;\n- result = Math.max(result, cur_result);\n- cur_result = 0;\n- }\n- cur_balls = 0;\n- }\n- System.out.println(result);\n- in.close();\n+ System.out.println(max);\n }\n }", "output": "SLOWER 0.0362", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.0254, "pair_id": "java_548_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Locale;\n+import java.util.Scanner;\n \n-public class Main {\n+public class Zuma {\n \n public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ in.useLocale(Locale.US);\n \n- Scanner cin = new Scanner(System.in);\n- int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n- int[] a = new int[110], b = new int[110];\n+ int n, k, x;\n+ int result = 0, cur_result = 0;\n+ int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n+ n = in.nextInt();\n+ k = in.nextInt();\n+ x = in.nextInt();\n+ int balls[] = new int[n];\n+ boolean destroying = false;\n for (int i = 0; i < n; i++) {\n- a[i] = cin.nextInt();\n+ balls[i] = in.nextInt();\n }\n- for (int i = 0; i + 1 < n; i++) {\n- if (a[i] == x && a[i + 1] == x) {\n- top = 0;\n- for (int j = 0; j < n; j++) {\n- if (j == i + 1) top--;\n- else if (top < 2) b[++top] = a[j];\n- else if (b[top] == b[top - 1] && b[top] == a[j]) {\n- while (j + 1 < n && a[j + 1] == b[top]) j++;\n- top -= 2;\n- } else b[++top] = a[j];\n+ cur_balls = 0;\n+ for (int i = 0; i < n; i++) {\n+ if (balls[i] == x) {\n+ cur_balls++;\n+ continue;\n+ }\n+ if (cur_balls >= 2) {\n+ cur_balls_r = 0;\n+ cur_balls_l = 0;\n+ balls_r = 0;\n+ balls_l = cur_balls;\n+ destroying = true;\n+ while (destroying) {\n+ destroying = false;\n+ if (i - balls_l - 1 >= 0) {\n+ cur_color = balls[i - balls_l - 1];\n+ for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n+ if (balls[jl] == cur_color) cur_balls_l++;\n+ else break;\n+ }\n+ }\n+ if (i + balls_r < n) {\n+ if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n+ for (int jr = i + balls_r; jr < n; jr++) {\n+ if (balls[jr] == cur_color) cur_balls_r++;\n+ else break;\n+ }\n+ }\n+ if (cur_balls_l + cur_balls_r >= 3) {\n+ balls_r += cur_balls_r;\n+ balls_l += cur_balls_l;\n+ cur_balls_l = 0;\n+ cur_balls_r = 0;\n+ destroying = true;\n+ }\n }\n- ans = ans > top ? top : ans;\n+ if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n+ else cur_result = 2;\n+ result = Math.max(result, cur_result);\n+ cur_result = 0;\n }\n+ cur_balls = 0;\n }\n- if (ans == 110) ans = n;\n- System.out.println(n - ans);\n-\n- System.out.println();\n+ System.out.println(result);\n+ in.close();\n }\n }", "output": "FASTER 0.0618", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.0438, "pair_id": "java_549_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Locale;\nimport java.util.Scanner;\n\npublic class Zuma {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n in.useLocale(Locale.US);\n\n int n, k, x;\n int result = 0, cur_result = 0;\n int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n n = in.nextInt();\n k = in.nextInt();\n x = in.nextInt();\n int balls[] = new int[n];\n boolean destroying = false;\n for (int i = 0; i < n; i++) {\n balls[i] = in.nextInt();\n }\n cur_balls = 0;\n for (int i = 0; i < n; i++) {\n if (balls[i] == x) {\n cur_balls++;\n continue;\n }\n if (cur_balls >= 2) {\n cur_balls_r = 0;\n cur_balls_l = 0;\n balls_r = 0;\n balls_l = cur_balls;\n destroying = true;\n while (destroying) {\n destroying = false;\n if (i - balls_l - 1 >= 0) {\n cur_color = balls[i - balls_l - 1];\n for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n if (balls[jl] == cur_color) cur_balls_l++;\n else break;\n }\n }\n if (i + balls_r < n) {\n if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n for (int jr = i + balls_r; jr < n; jr++) {\n if (balls[jr] == cur_color) cur_balls_r++;\n else break;\n }\n }\n if (cur_balls_l + cur_balls_r >= 3) {\n balls_r += cur_balls_r;\n balls_l += cur_balls_l;\n cur_balls_l = 0;\n cur_balls_r = 0;\n destroying = true;\n }\n }\n if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n else cur_result = 2;\n result = Math.max(result, cur_result);\n cur_result = 0;\n }\n cur_balls = 0;\n }\n System.out.println(result);\n in.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n a[i] = cin.nextInt();\n }\n for (int i = 0; i + 1 < n; i++) {\n if (a[i] == x && a[i + 1] == x) {\n top = 0;\n for (int j = 0; j < n; j++) {\n if (j == i + 1) top--;\n else if (top < 2) b[++top] = a[j];\n else if (b[top] == b[top - 1] && b[top] == a[j]) {\n while (j + 1 < n && a[j + 1] == b[top]) j++;\n top -= 2;\n } else b[++top] = a[j];\n }\n ans = ans > top ? top : ans;\n }\n }\n if (ans == 110) ans = n;\n System.out.println(n - ans);\n\n System.out.println();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Locale;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Zuma {\n+public class Main {\n \n public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- in.useLocale(Locale.US);\n \n- int n, k, x;\n- int result = 0, cur_result = 0;\n- int cur_balls = 0, cur_color = 0, cur_balls_l = 0, cur_balls_r = 0, balls_r = 0, balls_l = 0;\n- n = in.nextInt();\n- k = in.nextInt();\n- x = in.nextInt();\n- int balls[] = new int[n];\n- boolean destroying = false;\n+ Scanner cin = new Scanner(System.in);\n+ int n = cin.nextInt(), k = cin.nextInt(), x = cin.nextInt(), ans = 110, top;\n+ int[] a = new int[110], b = new int[110];\n for (int i = 0; i < n; i++) {\n- balls[i] = in.nextInt();\n+ a[i] = cin.nextInt();\n }\n- cur_balls = 0;\n- for (int i = 0; i < n; i++) {\n- if (balls[i] == x) {\n- cur_balls++;\n- continue;\n+ for (int i = 0; i + 1 < n; i++) {\n+ if (a[i] == x && a[i + 1] == x) {\n+ top = 0;\n+ for (int j = 0; j < n; j++) {\n+ if (j == i + 1) top--;\n+ else if (top < 2) b[++top] = a[j];\n+ else if (b[top] == b[top - 1] && b[top] == a[j]) {\n+ while (j + 1 < n && a[j + 1] == b[top]) j++;\n+ top -= 2;\n+ } else b[++top] = a[j];\n+ }\n+ ans = ans > top ? top : ans;\n }\n- if (cur_balls >= 2) {\n- cur_balls_r = 0;\n- cur_balls_l = 0;\n- balls_r = 0;\n- balls_l = cur_balls;\n- destroying = true;\n- while (destroying) {\n- destroying = false;\n- if (i - balls_l - 1 >= 0) {\n- cur_color = balls[i - balls_l - 1];\n- for (int jl = i - balls_l - 1; jl >= 0; jl--) {\n- if (balls[jl] == cur_color) cur_balls_l++;\n- else break;\n- }\n- }\n- if (i + balls_r < n) {\n- if (cur_color == 0) cur_color = balls[i + balls_r + 1];\n- for (int jr = i + balls_r; jr < n; jr++) {\n- if (balls[jr] == cur_color) cur_balls_r++;\n- else break;\n- }\n- }\n- if (cur_balls_l + cur_balls_r >= 3) {\n- balls_r += cur_balls_r;\n- balls_l += cur_balls_l;\n- cur_balls_l = 0;\n- cur_balls_r = 0;\n- destroying = true;\n- }\n- }\n- if (balls_r + balls_l > 2) cur_result += balls_r + balls_l;\n- else cur_result = 2;\n- result = Math.max(result, cur_result);\n- cur_result = 0;\n- }\n- cur_balls = 0;\n }\n- System.out.println(result);\n- in.close();\n+ if (ans == 110) ans = n;\n+ System.out.println(n - ans);\n+\n+ System.out.println();\n }\n }", "output": "SLOWER 0.0618", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.0438, "pair_id": "java_549_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n+public class B430 {\n+\n+ public static int length;\n+ public static int[] line;\n+\n+ public static int destroy(int min, int max) {\n+ if (min < 0 || max >= length || line[min] != line[max]) return 0;\n+\n+ int cnt = 0;\n+ int color = line[min];\n+\n+ while (min >= 0 && line[min] == color) {\n+ min--;\n+ cnt++;\n+ }\n+ while (max < length && color == line[max]) {\n+ max++;\n+ cnt++;\n+ }\n+ if (cnt >= 3) return cnt + destroy(min, max);\n+ return 0;\n+ }\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n+\n+ int colors, given;\n+\n+ Scanner s = new Scanner(System.in);\n+ length = s.nextInt();\n+ colors = s.nextInt();\n+ given = s.nextInt();\n+ line = new int[length];\n+ int max = 0;\n+\n+ for (int i = 0; i < length; i++) line[i] = s.nextInt();\n+\n+ for (int i = 0; i < length - 1; i++) {\n+ if (line[i] == given && line[i + 1] == given) {\n+ max = Math.max(max, 2 + destroy(i - 1, i + 2));\n+ }\n+ }\n+ System.out.println(max);\n }\n }\n-\n-class TaskB {\n- public int process(List lst) {\n- int res = 0;\n- boolean is_chang = true;\n- while (is_chang) {\n- is_chang = false;\n- for (int i = 0; i < lst.size(); i++) {\n- int cur = 0;\n- while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n- cur++;\n- }\n-\n- if (cur >= 3) {\n- is_chang = true;\n- for (int z = 0; z < cur; z++) {\n- lst.remove(i);\n- }\n- res += cur;\n- break;\n- }\n- }\n- }\n- return res;\n- }\n-\n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- List lst = new ArrayList();\n- int n = in.nextInt();\n- int k = in.nextInt();\n- int c = in.nextInt();\n- for (int i = 0; i < n; i++) {\n- lst.add(in.nextInt());\n- }\n-\n- int max = 0;\n- for (int i = 0; i < n; i++) {\n- List nw = new ArrayList();\n- for (int j = 0; j < n; j++) {\n- if (j == i) {\n- nw.add(c);\n- }\n- nw.add(lst.get(j));\n- }\n-\n- int res = process(nw);\n- if (res > max) {\n- max = res;\n- }\n- }\n- if (max > 0) {\n- max--;\n- }\n- out.print(max);\n- }\n-}", "output": "FASTER 0.2167", "problem_id": "430_B", "direction": "forward", "speedup_ratio": 1.1621, "pair_id": "java_552_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class B430 {\n\n public static int length;\n public static int[] line;\n\n public static int destroy(int min, int max) {\n if (min < 0 || max >= length || line[min] != line[max]) return 0;\n\n int cnt = 0;\n int color = line[min];\n\n while (min >= 0 && line[min] == color) {\n min--;\n cnt++;\n }\n while (max < length && color == line[max]) {\n max++;\n cnt++;\n }\n if (cnt >= 3) return cnt + destroy(min, max);\n return 0;\n }\n\n public static void main(String[] args) {\n\n int colors, given;\n\n Scanner s = new Scanner(System.in);\n length = s.nextInt();\n colors = s.nextInt();\n given = s.nextInt();\n line = new int[length];\n int max = 0;\n\n for (int i = 0; i < length; i++) line[i] = s.nextInt();\n\n for (int i = 0; i < length - 1; i++) {\n if (line[i] == given && line[i + 1] == given) {\n max = Math.max(max, 2 + destroy(i - 1, i + 2));\n }\n }\n System.out.println(max);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n}\n\nclass TaskB {\n public int process(List lst) {\n int res = 0;\n boolean is_chang = true;\n while (is_chang) {\n is_chang = false;\n for (int i = 0; i < lst.size(); i++) {\n int cur = 0;\n while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n cur++;\n }\n\n if (cur >= 3) {\n is_chang = true;\n for (int z = 0; z < cur; z++) {\n lst.remove(i);\n }\n res += cur;\n break;\n }\n }\n }\n return res;\n }\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n List lst = new ArrayList();\n int n = in.nextInt();\n int k = in.nextInt();\n int c = in.nextInt();\n for (int i = 0; i < n; i++) {\n lst.add(in.nextInt());\n }\n\n int max = 0;\n for (int i = 0; i < n; i++) {\n List nw = new ArrayList();\n for (int j = 0; j < n; j++) {\n if (j == i) {\n nw.add(c);\n }\n nw.add(lst.get(j));\n }\n\n int res = process(nw);\n if (res > max) {\n max = res;\n }\n }\n if (max > 0) {\n max--;\n }\n out.print(max);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class B430 {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n+}\n \n- public static int length;\n- public static int[] line;\n+class TaskB {\n+ public int process(List lst) {\n+ int res = 0;\n+ boolean is_chang = true;\n+ while (is_chang) {\n+ is_chang = false;\n+ for (int i = 0; i < lst.size(); i++) {\n+ int cur = 0;\n+ while ((i + cur < lst.size()) && (lst.get(i + cur).equals(lst.get(i)))) {\n+ cur++;\n+ }\n \n- public static int destroy(int min, int max) {\n- if (min < 0 || max >= length || line[min] != line[max]) return 0;\n-\n- int cnt = 0;\n- int color = line[min];\n-\n- while (min >= 0 && line[min] == color) {\n- min--;\n- cnt++;\n+ if (cur >= 3) {\n+ is_chang = true;\n+ for (int z = 0; z < cur; z++) {\n+ lst.remove(i);\n+ }\n+ res += cur;\n+ break;\n+ }\n+ }\n }\n- while (max < length && color == line[max]) {\n- max++;\n- cnt++;\n- }\n- if (cnt >= 3) return cnt + destroy(min, max);\n- return 0;\n+ return res;\n }\n \n- public static void main(String[] args) {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ List lst = new ArrayList();\n+ int n = in.nextInt();\n+ int k = in.nextInt();\n+ int c = in.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ lst.add(in.nextInt());\n+ }\n \n- int colors, given;\n+ int max = 0;\n+ for (int i = 0; i < n; i++) {\n+ List nw = new ArrayList();\n+ for (int j = 0; j < n; j++) {\n+ if (j == i) {\n+ nw.add(c);\n+ }\n+ nw.add(lst.get(j));\n+ }\n \n- Scanner s = new Scanner(System.in);\n- length = s.nextInt();\n- colors = s.nextInt();\n- given = s.nextInt();\n- line = new int[length];\n- int max = 0;\n-\n- for (int i = 0; i < length; i++) line[i] = s.nextInt();\n-\n- for (int i = 0; i < length - 1; i++) {\n- if (line[i] == given && line[i + 1] == given) {\n- max = Math.max(max, 2 + destroy(i - 1, i + 2));\n+ int res = process(nw);\n+ if (res > max) {\n+ max = res;\n }\n }\n- System.out.println(max);\n+ if (max > 0) {\n+ max--;\n+ }\n+ out.print(max);\n }\n }", "output": "SLOWER 0.2167", "problem_id": "430_B", "direction": "reversed", "speedup_ratio": 1.1621, "pair_id": "java_552_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n \n-public class bai3 {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) {\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n-\n- for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n- }\n-\n- int count = 0;\n- List result = new ArrayList<>();\n-\n- int i = 0;\n- int j = 0;\n- while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n- i++;\n- j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n j++;\n- } else {\n- i++;\n }\n+ }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n \n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n+ static class pair {\n+ int x;\n+ int y;\n+\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n }\n }\n }", "output": "FASTER 0.2675", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.2037, "pair_id": "java_3048_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class Main {\n+public class bai3 {\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n- }\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n+ for (int i = 0; i < n; i++) {\n+ list_n.add(scanner.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ list_m.add(scanner.nextInt());\n+ }\n+\n+ int count = 0;\n+ List result = new ArrayList<>();\n+\n+ int i = 0;\n+ int j = 0;\n+ while (i < n && j < m) {\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n+ i++;\n+ j++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n+ } else {\n+ i++;\n }\n- }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n \n- static class pair {\n- int x;\n- int y;\n-\n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n }\n }\n }", "output": "SLOWER 0.2675", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.2037, "pair_id": "java_3048_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class bai3 {\n+public class Solution {\n \n- public static void main(String[] args) {\n+ static Scanner sc = new Scanner(System.in);\n \n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n+ public static void main(String args[]) {\n \n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n+ a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n+ b[i] = sc.nextInt();\n }\n-\n- int count = 0;\n- List result = new ArrayList<>();\n-\n- int i = 0;\n- int j = 0;\n+ int i = 0, j = 0;\n while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n i++;\n j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n- j++;\n- } else {\n- i++;\n- }\n- }\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n }\n-\n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n }\n }\n }", "output": "FASTER 0.0687", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0488, "pair_id": "java_3062_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class Solution {\n+public class bai3 {\n \n- static Scanner sc = new Scanner(System.in);\n+ public static void main(String[] args) {\n \n- public static void main(String args[]) {\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n \n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n- int[] a = new int[n];\n- int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n+ list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n+ list_m.add(scanner.nextInt());\n }\n- int i = 0, j = 0;\n+\n+ int count = 0;\n+ List result = new ArrayList<>();\n+\n+ int i = 0;\n+ int j = 0;\n while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n+ j++;\n+ } else {\n+ i++;\n+ }\n+ }\n }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n+\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n }\n }\n }", "output": "SLOWER 0.0687", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0488, "pair_id": "java_3062_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.math.*;\n+import java.util.*;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n+public class kakia {\n+ static int n, m, x, y;\n \n- public Close(int x, int y) {\n- u = x;\n- v = y;\n- }\n- }\n-\n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n-\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n+ a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n+ b[i] = in.nextInt();\n }\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n- i++;\n- j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n+ j++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n+ j++;\n+ }\n }\n }\n-\n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n- }\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n+ ;\n }\n+;", "output": "FASTER 0.1222", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0884, "pair_id": "java_3052_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n \n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n+\n for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n+ a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n+ b.add(sc.nextInt());\n }\n- int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n- j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n- j++;\n- }\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n+ i++;\n+ j++;\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n }\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n+ }\n }\n- ;\n }\n-;", "output": "SLOWER 0.1222", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0884, "pair_id": "java_3052_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n+public class vest {\n \n- public Close(int x, int y) {\n- u = x;\n- v = y;\n- }\n+ public static int fit(int a, int b, int x, int y) {\n+\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n }\n \n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n+\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n \n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n \n- for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n- }\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n \n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n- i++;\n- j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n }\n }\n \n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n+ System.out.println(result.size() / 2);\n+\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.1007", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0723, "pair_id": "java_3056_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class vest {\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n \n- public static int fit(int a, int b, int x, int y) {\n-\n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n+ }\n }\n \n public static void main(String[] args) {\n \n Scanner sc = new Scanner(System.in);\n-\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n \n- int[] a = new int[n];\n- int[] b = new int[m];\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n \n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ a.add(sc.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b.add(sc.nextInt());\n+ }\n \n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n+ i++;\n+ j++;\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n }\n }\n \n- System.out.println(result.size() / 2);\n-\n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n }\n-\n- sc.close();\n }\n }", "output": "SLOWER 0.1007", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0723, "pair_id": "java_3056_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n+import java.util.Arrays;\n+import java.util.Comparator;\n import java.util.Scanner;\n \n-public class bai3 {\n+public class Dressem_in_Vests {\n+\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n+\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n+\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n+ }\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n+ }\n+\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n+ }\n+ }\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n+ }\n+ }\n \n public static void main(String[] args) {\n \n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n-\n- for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n- }\n-\n- int count = 0;\n- List result = new ArrayList<>();\n-\n- int i = 0;\n- int j = 0;\n- while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n- i++;\n- j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n- j++;\n- } else {\n- i++;\n- }\n- }\n- }\n-\n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n- }\n+ solve();\n }\n }", "output": "FASTER 0.0793", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0565, "pair_id": "java_3060_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n+import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class Dressem_in_Vests {\n-\n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n-\n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n-\n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n- }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n- }\n-\n- Arrays.sort(\n- a,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n- }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n- }\n- }\n+public class bai3 {\n \n public static void main(String[] args) {\n \n- solve();\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n+\n+ for (int i = 0; i < n; i++) {\n+ list_n.add(scanner.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ list_m.add(scanner.nextInt());\n+ }\n+\n+ int count = 0;\n+ List result = new ArrayList<>();\n+\n+ int i = 0;\n+ int j = 0;\n+ while (i < n && j < m) {\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n+ i++;\n+ j++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n+ j++;\n+ } else {\n+ i++;\n+ }\n+ }\n+ }\n+\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n+ }\n }\n }", "output": "SLOWER 0.0793", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0565, "pair_id": "java_3060_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n- }\n- int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n- j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n+ }\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+\n+ static class pair {\n+ int x;\n+ int y;\n+\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n+ }\n }\n- ;\n }\n-;", "output": "FASTER 0.1249", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0904, "pair_id": "java_3043_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.math.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class kakia {\n+ static int n, m, x, y;\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b[i] = in.nextInt();\n+ }\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n+ j++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n- }\n }\n-\n- static class pair {\n- int x;\n- int y;\n-\n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n- }\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n+ ;\n }\n+;", "output": "SLOWER 0.1249", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0904, "pair_id": "java_3043_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n-\n- public Close(int x, int y) {\n- u = x;\n- v = y;\n- }\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- public static void main(String[] args) {\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n-\n- for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n- }\n-\n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n- i++;\n- j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n+ j++;\n+ }\n+ }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n \n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n+ static class pair {\n+ int x;\n+ int y;\n+\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n }\n }\n }", "output": "FASTER 0.2472", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.1869, "pair_id": "java_3047_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n+\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n+ }\n }\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ public static void main(String[] args) {\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n- j++;\n- }\n- }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n+\n+ for (int i = 0; i < n; i++) {\n+ a.add(sc.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b.add(sc.nextInt());\n+ }\n+\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n+ i++;\n+ j++;\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n }\n }\n \n- static class pair {\n- int x;\n- int y;\n-\n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n }\n }\n }", "output": "SLOWER 0.2472", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.1869, "pair_id": "java_3047_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class Solution {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- static Scanner sc = new Scanner(System.in);\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- public static void main(String args[]) {\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n+ j++;\n+ }\n+ }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n+ }\n+ }\n \n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n- int[] a = new int[n];\n- int[] b = new int[m];\n- for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n- }\n- for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n- }\n- int i = 0, j = 0;\n- while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n- i++;\n- j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n- }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n+ static class pair {\n+ int x;\n+ int y;\n+\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n }\n }\n }", "output": "FASTER 0.1987", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.1477, "pair_id": "java_3046_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n- }\n+public class Solution {\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ static Scanner sc = new Scanner(System.in);\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n- j++;\n- }\n- }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n- }\n+ public static void main(String args[]) {\n+\n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = sc.nextInt();\n }\n-\n- static class pair {\n- int x;\n- int y;\n-\n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n+ for (int i = 0; i < m; i++) {\n+ b[i] = sc.nextInt();\n+ }\n+ int i = 0, j = 0;\n+ while (i < n && j < m) {\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n+ i++;\n+ j++;\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n+ }\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n }\n }\n }", "output": "SLOWER 0.1987", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.1477, "pair_id": "java_3046_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class vest {\n-\n- public static int fit(int a, int b, int x, int y) {\n-\n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- public static void main(String[] args) {\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- Scanner sc = new Scanner(System.in);\n-\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- int[] a = new int[n];\n- int[] b = new int[m];\n-\n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n-\n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n+ j++;\n+ }\n+ }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n \n- System.out.println(result.size() / 2);\n+ static class pair {\n+ int x;\n+ int y;\n \n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n }\n-\n- sc.close();\n }\n }", "output": "FASTER 0.1464", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.1068, "pair_id": "java_3044_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n+public class vest {\n+\n+ public static int fit(int a, int b, int x, int y) {\n+\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n }\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ public static void main(String[] args) {\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n- j++;\n- }\n- }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n+\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n }\n }\n \n- static class pair {\n- int x;\n- int y;\n+ System.out.println(result.size() / 2);\n \n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n }\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.1464", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.1068, "pair_id": "java_3044_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-public class Solution {\n+public class vest {\n \n- static Scanner sc = new Scanner(System.in);\n+ public static int fit(int a, int b, int x, int y) {\n \n- public static void main(String args[]) {\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n+ }\n \n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n int[] a = new int[n];\n int[] b = new int[m];\n- for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n+ }\n }\n- for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n+\n+ System.out.println(result.size() / 2);\n+\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n }\n- int i = 0, j = 0;\n- while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n- i++;\n- j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n- }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n- }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.0523", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0369, "pair_id": "java_3055_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-public class vest {\n+public class Solution {\n \n- public static int fit(int a, int b, int x, int y) {\n+ static Scanner sc = new Scanner(System.in);\n \n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n- }\n+ public static void main(String args[]) {\n \n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n-\n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n-\n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n- }\n+ for (int i = 0; i < n; i++) {\n+ a[i] = sc.nextInt();\n }\n-\n- System.out.println(result.size() / 2);\n-\n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n+ for (int i = 0; i < m; i++) {\n+ b[i] = sc.nextInt();\n }\n-\n- sc.close();\n+ int i = 0, j = 0;\n+ while (i < n && j < m) {\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n+ i++;\n+ j++;\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n+ }\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n+ }\n }\n }", "output": "SLOWER 0.0523", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0369, "pair_id": "java_3055_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n+public class Solution {\n \n- public Close(int x, int y) {\n- u = x;\n- v = y;\n- }\n- }\n+ static Scanner sc = new Scanner(System.in);\n \n- public static void main(String[] args) {\n+ public static void main(String args[]) {\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n-\n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n+ a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n+ b[i] = sc.nextInt();\n }\n-\n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n+ int i = 0, j = 0;\n+ while (i < n && j < m) {\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n i++;\n j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n- }\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n }\n-\n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n }\n }\n }", "output": "FASTER 0.0485", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0342, "pair_id": "java_3061_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Scanner;\n \n-public class Solution {\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n \n- static Scanner sc = new Scanner(System.in);\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n+ }\n+ }\n \n- public static void main(String args[]) {\n+ public static void main(String[] args) {\n \n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n- int[] a = new int[n];\n- int[] b = new int[m];\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n+\n for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n+ a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n+ b.add(sc.nextInt());\n }\n- int i = 0, j = 0;\n- while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n+\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n+ }\n }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n+\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n }\n }\n }", "output": "SLOWER 0.0485", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0342, "pair_id": "java_3061_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n-import java.util.List;\n import java.util.Scanner;\n \n-public class bai3 {\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n+\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n+ }\n+ }\n \n public static void main(String[] args) {\n \n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n \n for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n+ a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n+ b.add(sc.nextInt());\n }\n \n- int count = 0;\n- List result = new ArrayList<>();\n-\n- int i = 0;\n- int j = 0;\n- while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n- j++;\n- } else {\n- i++;\n- }\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n }\n }\n \n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n }\n }\n }", "output": "FASTER 0.0203", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0142, "pair_id": "java_3063_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.ArrayList;\n+import java.util.List;\n import java.util.Scanner;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n-\n- public Close(int x, int y) {\n- u = x;\n- v = y;\n- }\n- }\n+public class bai3 {\n \n public static void main(String[] args) {\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n \n for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n+ list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n+ list_m.add(scanner.nextInt());\n }\n \n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n+ int count = 0;\n+ List result = new ArrayList<>();\n+\n+ int i = 0;\n+ int j = 0;\n+ while (i < n && j < m) {\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n+ j++;\n+ } else {\n+ i++;\n+ }\n }\n }\n \n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n }\n }\n }", "output": "SLOWER 0.0203", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0142, "pair_id": "java_3063_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class bai3 {\n+public class vest {\n+\n+ public static int fit(int a, int b, int x, int y) {\n+\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n+ }\n \n public static void main(String[] args) {\n \n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n+ Scanner sc = new Scanner(System.in);\n \n- for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n- }\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n \n- int count = 0;\n- List result = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n \n- int i = 0;\n- int j = 0;\n- while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n- i++;\n- j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n- j++;\n- } else {\n- i++;\n- }\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n }\n }\n \n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n+ System.out.println(result.size() / 2);\n+\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.121", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0875, "pair_id": "java_3057_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class vest {\n-\n- public static int fit(int a, int b, int x, int y) {\n-\n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n- }\n+public class bai3 {\n \n public static void main(String[] args) {\n \n- Scanner sc = new Scanner(System.in);\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n \n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n+ for (int i = 0; i < n; i++) {\n+ list_n.add(scanner.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ list_m.add(scanner.nextInt());\n+ }\n \n- int[] a = new int[n];\n- int[] b = new int[m];\n+ int count = 0;\n+ List result = new ArrayList<>();\n \n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n-\n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n+ int i = 0;\n+ int j = 0;\n+ while (i < n && j < m) {\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n+ i++;\n+ j++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n+ j++;\n+ } else {\n+ i++;\n+ }\n }\n }\n \n- System.out.println(result.size() / 2);\n-\n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n }\n-\n- sc.close();\n }\n }", "output": "SLOWER 0.121", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0875, "pair_id": "java_3057_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n-public class vest {\n+public class kakia {\n+ static int n, m, x, y;\n \n- public static int fit(int a, int b, int x, int y) {\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b[i] = in.nextInt();\n+ }\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n- }\n-\n- public static void main(String[] args) {\n-\n- Scanner sc = new Scanner(System.in);\n-\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- int[] a = new int[n];\n- int[] b = new int[m];\n-\n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n-\n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n+ j++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n+ j++;\n+ }\n }\n }\n-\n- System.out.println(result.size() / 2);\n-\n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n- }\n-\n- sc.close();\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n+ ;\n }\n+;", "output": "FASTER 0.0215", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.015, "pair_id": "java_3049_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n+import java.io.*;\n import java.util.*;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class vest {\n \n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n- }\n- int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n+ public static int fit(int a, int b, int x, int y) {\n \n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n- j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n- j++;\n- }\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n+ }\n+\n+ public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n+\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n }\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+\n+ System.out.println(result.size() / 2);\n+\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n+ }\n+\n+ sc.close();\n }\n- ;\n }\n-;", "output": "SLOWER 0.0215", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.015, "pair_id": "java_3049_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.List;\n-import java.util.Scanner;\n+import java.math.*;\n+import java.util.*;\n \n-public class bai3 {\n+public class kakia {\n+ static int n, m, x, y;\n \n- public static void main(String[] args) {\n-\n- Scanner scanner = new Scanner(System.in);\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- int x = scanner.nextInt();\n- int y = scanner.nextInt();\n- List list_n = new ArrayList<>();\n- List list_m = new ArrayList<>();\n-\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n- list_n.add(scanner.nextInt());\n+ a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- list_m.add(scanner.nextInt());\n+ b[i] = in.nextInt();\n }\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- int count = 0;\n- List result = new ArrayList<>();\n-\n- int i = 0;\n- int j = 0;\n- while (i < n && j < m) {\n- if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n- count++;\n- result.add((i + 1) + \" \" + (j + 1));\n- i++;\n- j++;\n- } else {\n- if (list_n.get(i) - x > list_m.get(j)) {\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n j++;\n- } else {\n- i++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n+ j++;\n }\n }\n }\n-\n- System.out.println(count);\n- for (String value : result) {\n- System.out.println(value);\n- }\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n+ ;\n }\n+;", "output": "FASTER 0.1425", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.1038, "pair_id": "java_3053_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.Scanner;\n\npublic class bai3 {\n\n public static void main(String[] args) {\n\n Scanner scanner = new Scanner(System.in);\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n int x = scanner.nextInt();\n int y = scanner.nextInt();\n List list_n = new ArrayList<>();\n List list_m = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n list_m.add(scanner.nextInt());\n }\n\n int count = 0;\n List result = new ArrayList<>();\n\n int i = 0;\n int j = 0;\n while (i < n && j < m) {\n if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n count++;\n result.add((i + 1) + \" \" + (j + 1));\n i++;\n j++;\n } else {\n if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n } else {\n i++;\n }\n }\n }\n\n System.out.println(count);\n for (String value : result) {\n System.out.println(value);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.List;\n+import java.util.Scanner;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class bai3 {\n \n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n+ public static void main(String[] args) {\n+\n+ Scanner scanner = new Scanner(System.in);\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ int x = scanner.nextInt();\n+ int y = scanner.nextInt();\n+ List list_n = new ArrayList<>();\n+ List list_m = new ArrayList<>();\n+\n for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n+ list_n.add(scanner.nextInt());\n }\n for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n+ list_m.add(scanner.nextInt());\n }\n+\n+ int count = 0;\n+ List result = new ArrayList<>();\n+\n+ int i = 0;\n int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n-\n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n+ while (i < n && j < m) {\n+ if (list_n.get(i) - x <= list_m.get(j) && list_m.get(j) <= list_n.get(i) + y) {\n+ count++;\n+ result.add((i + 1) + \" \" + (j + 1));\n+ i++;\n+ j++;\n+ } else {\n+ if (list_n.get(i) - x > list_m.get(j)) {\n j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n- j++;\n+ } else {\n+ i++;\n }\n }\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+\n+ System.out.println(count);\n+ for (String value : result) {\n+ System.out.println(value);\n+ }\n }\n- ;\n }\n-;", "output": "SLOWER 0.1425", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.1038, "pair_id": "java_3053_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.Comparator;\n import java.util.Scanner;\n \n-public class b03 {\n- public static class Close {\n- int u, v;\n+public class Dressem_in_Vests {\n \n- public Close(int x, int y) {\n- u = x;\n- v = y;\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n+\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n+\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n+ }\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n+ }\n+\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n+ }\n+ }\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n }\n }\n \n public static void main(String[] args) {\n \n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- ArrayList a = new ArrayList<>();\n- ArrayList b = new ArrayList<>();\n- ArrayList c = new ArrayList<>();\n-\n- for (int i = 0; i < n; i++) {\n- a.add(sc.nextInt());\n- }\n- for (int i = 0; i < m; i++) {\n- b.add(sc.nextInt());\n- }\n-\n- for (int i = 0, j = 0; i < n && j < m; ) {\n- if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n- c.add(new Close(i + 1, j + 1));\n- i++;\n- j++;\n- } else if (a.get(i) + y < b.get(j)) {\n- i++;\n- } else if (a.get(i) - x > b.get(j)) {\n- j++;\n- }\n- }\n-\n- System.out.println(c.size());\n- for (Close cl : c) {\n- System.out.println(cl.u + \" \" + cl.v);\n- }\n+ solve();\n }\n }", "output": "FASTER 0.0591", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0418, "pair_id": "java_3059_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class b03 {\n public static class Close {\n int u, v;\n\n public Close(int x, int y) {\n u = x;\n v = y;\n }\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n ArrayList a = new ArrayList<>();\n ArrayList b = new ArrayList<>();\n ArrayList c = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n a.add(sc.nextInt());\n }\n for (int i = 0; i < m; i++) {\n b.add(sc.nextInt());\n }\n\n for (int i = 0, j = 0; i < n && j < m; ) {\n if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n c.add(new Close(i + 1, j + 1));\n i++;\n j++;\n } else if (a.get(i) + y < b.get(j)) {\n i++;\n } else if (a.get(i) - x > b.get(j)) {\n j++;\n }\n }\n\n System.out.println(c.size());\n for (Close cl : c) {\n System.out.println(cl.u + \" \" + cl.v);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n+import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Dressem_in_Vests {\n+public class b03 {\n+ public static class Close {\n+ int u, v;\n \n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n-\n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n-\n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n- }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n- }\n-\n- Arrays.sort(\n- a,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n- }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n+ public Close(int x, int y) {\n+ u = x;\n+ v = y;\n }\n }\n \n public static void main(String[] args) {\n \n- solve();\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ ArrayList a = new ArrayList<>();\n+ ArrayList b = new ArrayList<>();\n+ ArrayList c = new ArrayList<>();\n+\n+ for (int i = 0; i < n; i++) {\n+ a.add(sc.nextInt());\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b.add(sc.nextInt());\n+ }\n+\n+ for (int i = 0, j = 0; i < n && j < m; ) {\n+ if (a.get(i) - x <= b.get(j) && b.get(j) <= a.get(i) + y) {\n+ c.add(new Close(i + 1, j + 1));\n+ i++;\n+ j++;\n+ } else if (a.get(i) + y < b.get(j)) {\n+ i++;\n+ } else if (a.get(i) - x > b.get(j)) {\n+ j++;\n+ }\n+ }\n+\n+ System.out.println(c.size());\n+ for (Close cl : c) {\n+ System.out.println(cl.u + \" \" + cl.v);\n+ }\n }\n }", "output": "SLOWER 0.0591", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0418, "pair_id": "java_3059_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Comparator;\n+import java.util.Scanner;\n \n-public class Solution {\n+public class Dressem_in_Vests {\n \n- static Scanner sc = new Scanner(System.in);\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n \n- public static void main(String args[]) {\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n \n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n- int[] a = new int[n];\n- int[] b = new int[m];\n- for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n }\n- for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n }\n- int i = 0, j = 0;\n- while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n- i++;\n- j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n+\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n+ }\n }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n }\n }\n+\n+ public static void main(String[] args) {\n+\n+ solve();\n+ }\n }", "output": "FASTER 0.0106", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0074, "pair_id": "java_3058_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n-import java.util.Scanner;\n+import java.util.*;\n \n-public class Dressem_in_Vests {\n+public class Solution {\n \n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n+ static Scanner sc = new Scanner(System.in);\n \n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n+ public static void main(String args[]) {\n \n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = sc.nextInt();\n }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n+ for (int i = 0; i < m; i++) {\n+ b[i] = sc.nextInt();\n }\n-\n- Arrays.sort(\n- a,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n+ int i = 0, j = 0;\n+ while (i < n && j < m) {\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n+ i++;\n+ j++;\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n }\n }\n-\n- public static void main(String[] args) {\n-\n- solve();\n- }\n }", "output": "SLOWER 0.0106", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0074, "pair_id": "java_3058_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.math.*;\n import java.util.*;\n \n-public class Solution {\n-\n- static Scanner sc = new Scanner(System.in);\n+public class kakia {\n+ static int n, m, x, y;\n \n public static void main(String args[]) {\n-\n- int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n- List ans = new ArrayList<>();\n- int[] a = new int[n];\n- int[] b = new int[m];\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n- a[i] = sc.nextInt();\n+ a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- b[i] = sc.nextInt();\n+ b[i] = in.nextInt();\n }\n- int i = 0, j = 0;\n- while (i < n && j < m) {\n- if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n- int[] t = {i + 1, j + 1};\n- ans.add(t);\n- i++;\n- j++;\n- } else if (a[i] > b[j] + x) j++;\n- else if (a[i] < b[j] - y) i++;\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n+\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n+ j++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n+ j++;\n+ }\n+ }\n }\n- System.out.println(ans.size());\n- for (int[] t : ans) {\n- System.out.println(t[0] + \" \" + t[1]);\n- }\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n+ ;\n }\n+;", "output": "FASTER 0.0738", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0525, "pair_id": "java_3051_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Solution {\n\n static Scanner sc = new Scanner(System.in);\n\n public static void main(String args[]) {\n\n int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n List ans = new ArrayList<>();\n int[] a = new int[n];\n int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = sc.nextInt();\n }\n int i = 0, j = 0;\n while (i < n && j < m) {\n if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n int[] t = {i + 1, j + 1};\n ans.add(t);\n i++;\n j++;\n } else if (a[i] > b[j] + x) j++;\n else if (a[i] < b[j] - y) i++;\n }\n System.out.println(ans.size());\n for (int[] t : ans) {\n System.out.println(t[0] + \" \" + t[1]);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n import java.util.*;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class Solution {\n+\n+ static Scanner sc = new Scanner(System.in);\n \n public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n+\n+ int n = sc.nextInt(), m = sc.nextInt(), x = sc.nextInt(), y = sc.nextInt();\n+ List ans = new ArrayList<>();\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n+ a[i] = sc.nextInt();\n }\n for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n+ b[i] = sc.nextInt();\n }\n- int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n-\n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n- j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n- j++;\n- }\n- }\n+ int i = 0, j = 0;\n+ while (i < n && j < m) {\n+ if ((a[i] <= b[j] + x) && (a[i] >= b[j] - y)) {\n+ int[] t = {i + 1, j + 1};\n+ ans.add(t);\n+ i++;\n+ j++;\n+ } else if (a[i] > b[j] + x) j++;\n+ else if (a[i] < b[j] - y) i++;\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+ System.out.println(ans.size());\n+ for (int[] t : ans) {\n+ System.out.println(t[0] + \" \" + t[1]);\n+ }\n }\n- ;\n }\n-;", "output": "SLOWER 0.0738", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0525, "pair_id": "java_3051_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n-import java.util.Scanner;\n+import java.math.*;\n+import java.util.*;\n \n-public class Dressem_in_Vests {\n+public class kakia {\n+ static int n, m, x, y;\n \n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n+ public static void main(String args[]) {\n+ Scanner in = new Scanner(System.in);\n+ n = in.nextInt();\n+ m = in.nextInt();\n+ x = in.nextInt();\n+ y = in.nextInt();\n+ int a[] = new int[100000];\n+ int b[] = new int[100000];\n+ int answer[][] = new int[100000][2];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ for (int i = 0; i < m; i++) {\n+ b[i] = in.nextInt();\n+ }\n+ int j = 0;\n+ int k1 = 0;\n+ for (int i = 0; i < n; i++) {\n+ while (j < m) {\n+ if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n-\n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n+ answer[k1][0] = i + 1;\n+ answer[k1][1] = j + 1;\n+ k1++;\n+ j++;\n+ break;\n+ } else if (b[j] > a[i] + y) {\n+ break;\n+ } else if (b[j] < a[i] - x) {\n+ j++;\n+ }\n+ }\n }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n- }\n-\n- Arrays.sort(\n- a,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n- }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n- }\n+ System.out.println(k1);\n+ for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n-\n- public static void main(String[] args) {\n-\n- solve();\n- }\n+ ;\n }\n+;", "output": "FASTER 0.0632", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0448, "pair_id": "java_3050_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class kakia {\n static int n, m, x, y;\n\n public static void main(String args[]) {\n Scanner in = new Scanner(System.in);\n n = in.nextInt();\n m = in.nextInt();\n x = in.nextInt();\n y = in.nextInt();\n int a[] = new int[100000];\n int b[] = new int[100000];\n int answer[][] = new int[100000][2];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n for (int i = 0; i < m; i++) {\n b[i] = in.nextInt();\n }\n int j = 0;\n int k1 = 0;\n for (int i = 0; i < n; i++) {\n while (j < m) {\n if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n\n answer[k1][0] = i + 1;\n answer[k1][1] = j + 1;\n k1++;\n j++;\n break;\n } else if (b[j] > a[i] + y) {\n break;\n } else if (b[j] < a[i] - x) {\n j++;\n }\n }\n }\n System.out.println(k1);\n for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n }\n ;\n}\n;\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Comparator;\n+import java.util.Scanner;\n \n-public class kakia {\n- static int n, m, x, y;\n+public class Dressem_in_Vests {\n \n- public static void main(String args[]) {\n- Scanner in = new Scanner(System.in);\n- n = in.nextInt();\n- m = in.nextInt();\n- x = in.nextInt();\n- y = in.nextInt();\n- int a[] = new int[100000];\n- int b[] = new int[100000];\n- int answer[][] = new int[100000][2];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n+\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n+\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n }\n- for (int i = 0; i < m; i++) {\n- b[i] = in.nextInt();\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n }\n- int j = 0;\n- int k1 = 0;\n- for (int i = 0; i < n; i++) {\n- while (j < m) {\n- if (b[j] >= a[i] - x && b[j] <= a[i] + y) {\n \n- answer[k1][0] = i + 1;\n- answer[k1][1] = j + 1;\n- k1++;\n- j++;\n- break;\n- } else if (b[j] > a[i] + y) {\n- break;\n- } else if (b[j] < a[i] - x) {\n- j++;\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n }\n- }\n }\n- System.out.println(k1);\n- for (int i = 0; i < k1; i++) System.out.println(answer[i][0] + \" \" + answer[i][1]);\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n+ }\n }\n- ;\n+\n+ public static void main(String[] args) {\n+\n+ solve();\n+ }\n }\n-;", "output": "SLOWER 0.0632", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0448, "pair_id": "java_3050_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class Dressem_in_Vests {\n+public class vest {\n \n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n+ public static int fit(int a, int b, int x, int y) {\n \n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n-\n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n- }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n- }\n-\n- Arrays.sort(\n- a,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n- }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n- }\n+ if (a - x > b) return 1;\n+ if (a + y < b) return 2;\n+ return 0;\n }\n \n public static void main(String[] args) {\n \n- solve();\n+ Scanner sc = new Scanner(System.in);\n+\n+ int n = sc.nextInt();\n+ int m = sc.nextInt();\n+ int x = sc.nextInt();\n+ int y = sc.nextInt();\n+\n+ int[] a = new int[n];\n+ int[] b = new int[m];\n+\n+ for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n+\n+ for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n+\n+ int u = 0;\n+ int v = 0;\n+ int temp;\n+ ArrayList result = new ArrayList();\n+\n+ while (u < n && v < m) {\n+ temp = fit(a[u], b[v], x, y);\n+ if (temp == 1) v++;\n+ if (temp == 2) u++;\n+ if (temp == 0) {\n+ result.add(u + 1);\n+ result.add(v + 1);\n+ u++;\n+ v++;\n+ }\n+ }\n+\n+ System.out.println(result.size() / 2);\n+\n+ Iterator itr = result.iterator();\n+ while (itr.hasNext()) {\n+ System.out.print(itr.next());\n+ System.out.print(\" \");\n+ System.out.println(itr.next());\n+ }\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.0417", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.0293, "pair_id": "java_3054_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class vest {\n\n public static int fit(int a, int b, int x, int y) {\n\n if (a - x > b) return 1;\n if (a + y < b) return 2;\n return 0;\n }\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n\n int n = sc.nextInt();\n int m = sc.nextInt();\n int x = sc.nextInt();\n int y = sc.nextInt();\n\n int[] a = new int[n];\n int[] b = new int[m];\n\n for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n\n for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n\n int u = 0;\n int v = 0;\n int temp;\n ArrayList result = new ArrayList();\n\n while (u < n && v < m) {\n temp = fit(a[u], b[v], x, y);\n if (temp == 1) v++;\n if (temp == 2) u++;\n if (temp == 0) {\n result.add(u + 1);\n result.add(v + 1);\n u++;\n v++;\n }\n }\n\n System.out.println(result.size() / 2);\n\n Iterator itr = result.iterator();\n while (itr.hasNext()) {\n System.out.print(itr.next());\n System.out.print(\" \");\n System.out.println(itr.next());\n }\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Comparator;\n+import java.util.Scanner;\n \n-public class vest {\n+public class Dressem_in_Vests {\n \n- public static int fit(int a, int b, int x, int y) {\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n \n- if (a - x > b) return 1;\n- if (a + y < b) return 2;\n- return 0;\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n+\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n+ }\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n+ }\n+\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n+ }\n+ }\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n+ }\n }\n \n public static void main(String[] args) {\n \n- Scanner sc = new Scanner(System.in);\n-\n- int n = sc.nextInt();\n- int m = sc.nextInt();\n- int x = sc.nextInt();\n- int y = sc.nextInt();\n-\n- int[] a = new int[n];\n- int[] b = new int[m];\n-\n- for (int i = 0; i < n; i++) a[i] = sc.nextInt();\n-\n- for (int i = 0; i < m; i++) b[i] = sc.nextInt();\n-\n- int u = 0;\n- int v = 0;\n- int temp;\n- ArrayList result = new ArrayList();\n-\n- while (u < n && v < m) {\n- temp = fit(a[u], b[v], x, y);\n- if (temp == 1) v++;\n- if (temp == 2) u++;\n- if (temp == 0) {\n- result.add(u + 1);\n- result.add(v + 1);\n- u++;\n- v++;\n- }\n- }\n-\n- System.out.println(result.size() / 2);\n-\n- Iterator itr = result.iterator();\n- while (itr.hasNext()) {\n- System.out.print(itr.next());\n- System.out.print(\" \");\n- System.out.println(itr.next());\n- }\n-\n- sc.close();\n+ solve();\n }\n }", "output": "SLOWER 0.0417", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.0293, "pair_id": "java_3054_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Comparator;\n+import java.io.InputStream;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n import java.util.Scanner;\n \n-public class Dressem_in_Vests {\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ ADressemInVests solver = new ADressemInVests();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void solve() {\n- Scanner nera = new Scanner(System.in);\n+ static class ADressemInVests {\n+ static final int MAXN = 100001;\n \n- int n = nera.nextInt();\n- int m = nera.nextInt();\n- int x = nera.nextInt();\n- int y = nera.nextInt();\n- int i = 0, j = 0, k = 0;\n- int a[][] = new int[n][2];\n- int b[][] = new int[m][2];\n-\n- for (i = 0; i < n; ++i) {\n- a[i][0] = i;\n- a[i][1] = nera.nextInt();\n- }\n- for (i = 0; i < m; ++i) {\n- b[i][0] = i;\n- b[i][1] = nera.nextInt();\n+ public void solve(int testNumber, Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int m = in.nextInt();\n+ int x = in.nextInt();\n+ int y = in.nextInt();\n+ int solider[] = new int[MAXN];\n+ int vest[] = new int[MAXN];\n+ for (int i = 0; i < n; i++) {\n+ solider[i] = in.nextInt();\n+ }\n+ for (int j = 0; j < m; j++) {\n+ vest[j] = in.nextInt();\n+ }\n+ int j = 0;\n+ ArrayList ans = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ while (j + 1 < m && vest[j] < solider[i] - x) j++;\n+ if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n+ ans.add(new ADressemInVests.pair(i, j));\n+ j++;\n+ }\n+ }\n+ out.println(ans.size());\n+ for (int i = 0; i < ans.size(); i++) {\n+ out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n+ }\n }\n \n- Arrays.sort(\n- a,\n- new Comparator() {\n+ static class pair {\n+ int x;\n+ int y;\n \n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- Arrays.sort(\n- b,\n- new Comparator() {\n-\n- @Override\n- public int compare(int[] o1, int[] o2) {\n- int a1 = o1[1];\n- int b1 = o2[1];\n-\n- return (a1 >= b1 ? 1 : -1);\n- }\n- });\n- int z[][] = new int[Math.max(n, m)][2];\n- int sum = 0, count = 0;\n- int q = 0;\n- int temp = b[j][1];\n- for (j = 0; j < m; ++j) {\n- if (q != n)\n- for (i = q; i < n; ++i) {\n- q++;\n- if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n- sum++;\n- z[k][0] = i + 1;\n- z[k][1] = j + 1;\n- k++;\n- count++;\n- if (j + 1 != m) temp = b[j + 1][1];\n- break;\n- } else if (temp < (a[i][1] - x)) {\n- if (j + 1 != m) temp = b[j + 1][1];\n- q--;\n- break;\n- }\n- }\n- }\n-\n- System.out.println(sum);\n- i = 0;\n- while (i < count) {\n- System.out.println(z[i][0] + \" \" + z[i][1]);\n- ++i;\n+ public pair(int x, int y) {\n+ this.x = x;\n+ this.y = y;\n+ }\n }\n }\n-\n- public static void main(String[] args) {\n-\n- solve();\n- }\n }", "output": "FASTER 0.1881", "problem_id": "161_A", "direction": "forward", "speedup_ratio": 1.1393, "pair_id": "java_3045_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.InputStream;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n ADressemInVests solver = new ADressemInVests();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class ADressemInVests {\n static final int MAXN = 100001;\n\n public void solve(int testNumber, Scanner in, PrintWriter out) {\n int n = in.nextInt();\n int m = in.nextInt();\n int x = in.nextInt();\n int y = in.nextInt();\n int solider[] = new int[MAXN];\n int vest[] = new int[MAXN];\n for (int i = 0; i < n; i++) {\n solider[i] = in.nextInt();\n }\n for (int j = 0; j < m; j++) {\n vest[j] = in.nextInt();\n }\n int j = 0;\n ArrayList ans = new ArrayList();\n for (int i = 0; i < n; i++) {\n while (j + 1 < m && vest[j] < solider[i] - x) j++;\n if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n ans.add(new ADressemInVests.pair(i, j));\n j++;\n }\n }\n out.println(ans.size());\n for (int i = 0; i < ans.size(); i++) {\n out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n }\n }\n\n static class pair {\n int x;\n int y;\n\n public pair(int x, int y) {\n this.x = x;\n this.y = y;\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.Scanner;\n\npublic class Dressem_in_Vests {\n\n public static void solve() {\n Scanner nera = new Scanner(System.in);\n\n int n = nera.nextInt();\n int m = nera.nextInt();\n int x = nera.nextInt();\n int y = nera.nextInt();\n int i = 0, j = 0, k = 0;\n int a[][] = new int[n][2];\n int b[][] = new int[m][2];\n\n for (i = 0; i < n; ++i) {\n a[i][0] = i;\n a[i][1] = nera.nextInt();\n }\n for (i = 0; i < m; ++i) {\n b[i][0] = i;\n b[i][1] = nera.nextInt();\n }\n\n Arrays.sort(\n a,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n Arrays.sort(\n b,\n new Comparator() {\n\n @Override\n public int compare(int[] o1, int[] o2) {\n int a1 = o1[1];\n int b1 = o2[1];\n\n return (a1 >= b1 ? 1 : -1);\n }\n });\n int z[][] = new int[Math.max(n, m)][2];\n int sum = 0, count = 0;\n int q = 0;\n int temp = b[j][1];\n for (j = 0; j < m; ++j) {\n if (q != n)\n for (i = q; i < n; ++i) {\n q++;\n if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n sum++;\n z[k][0] = i + 1;\n z[k][1] = j + 1;\n k++;\n count++;\n if (j + 1 != m) temp = b[j + 1][1];\n break;\n } else if (temp < (a[i][1] - x)) {\n if (j + 1 != m) temp = b[j + 1][1];\n q--;\n break;\n }\n }\n }\n\n System.out.println(sum);\n i = 0;\n while (i < count) {\n System.out.println(z[i][0] + \" \" + z[i][1]);\n ++i;\n }\n }\n\n public static void main(String[] args) {\n\n solve();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.InputStream;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.Comparator;\n import java.util.Scanner;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- ADressemInVests solver = new ADressemInVests();\n- solver.solve(1, in, out);\n- out.close();\n+public class Dressem_in_Vests {\n+\n+ public static void solve() {\n+ Scanner nera = new Scanner(System.in);\n+\n+ int n = nera.nextInt();\n+ int m = nera.nextInt();\n+ int x = nera.nextInt();\n+ int y = nera.nextInt();\n+ int i = 0, j = 0, k = 0;\n+ int a[][] = new int[n][2];\n+ int b[][] = new int[m][2];\n+\n+ for (i = 0; i < n; ++i) {\n+ a[i][0] = i;\n+ a[i][1] = nera.nextInt();\n+ }\n+ for (i = 0; i < m; ++i) {\n+ b[i][0] = i;\n+ b[i][1] = nera.nextInt();\n+ }\n+\n+ Arrays.sort(\n+ a,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ Arrays.sort(\n+ b,\n+ new Comparator() {\n+\n+ @Override\n+ public int compare(int[] o1, int[] o2) {\n+ int a1 = o1[1];\n+ int b1 = o2[1];\n+\n+ return (a1 >= b1 ? 1 : -1);\n+ }\n+ });\n+ int z[][] = new int[Math.max(n, m)][2];\n+ int sum = 0, count = 0;\n+ int q = 0;\n+ int temp = b[j][1];\n+ for (j = 0; j < m; ++j) {\n+ if (q != n)\n+ for (i = q; i < n; ++i) {\n+ q++;\n+ if (temp >= (a[i][1] - x) && temp <= (a[i][1] + y)) {\n+ sum++;\n+ z[k][0] = i + 1;\n+ z[k][1] = j + 1;\n+ k++;\n+ count++;\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ break;\n+ } else if (temp < (a[i][1] - x)) {\n+ if (j + 1 != m) temp = b[j + 1][1];\n+ q--;\n+ break;\n+ }\n+ }\n+ }\n+\n+ System.out.println(sum);\n+ i = 0;\n+ while (i < count) {\n+ System.out.println(z[i][0] + \" \" + z[i][1]);\n+ ++i;\n+ }\n }\n \n- static class ADressemInVests {\n- static final int MAXN = 100001;\n+ public static void main(String[] args) {\n \n- public void solve(int testNumber, Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int m = in.nextInt();\n- int x = in.nextInt();\n- int y = in.nextInt();\n- int solider[] = new int[MAXN];\n- int vest[] = new int[MAXN];\n- for (int i = 0; i < n; i++) {\n- solider[i] = in.nextInt();\n- }\n- for (int j = 0; j < m; j++) {\n- vest[j] = in.nextInt();\n- }\n- int j = 0;\n- ArrayList ans = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- while (j + 1 < m && vest[j] < solider[i] - x) j++;\n- if (j < m && solider[i] - x <= vest[j] && vest[j] <= solider[i] + y) {\n- ans.add(new ADressemInVests.pair(i, j));\n- j++;\n- }\n- }\n- out.println(ans.size());\n- for (int i = 0; i < ans.size(); i++) {\n- out.println((ans.get(i).x + 1) + \" \" + (ans.get(i).y + 1));\n- }\n- }\n-\n- static class pair {\n- int x;\n- int y;\n-\n- public pair(int x, int y) {\n- this.x = x;\n- this.y = y;\n- }\n- }\n+ solve();\n }\n }", "output": "SLOWER 0.1881", "problem_id": "161_A", "direction": "reversed", "speedup_ratio": 1.1393, "pair_id": "java_3045_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class E {\n static class Pair implements Comparable {\n int num, idx;\n\n Pair(int n, int i) {\n num = n;\n idx = i;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return num - pair.num;\n }\n }\n\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = sc.nextInt();\n int[] idx = new int[100_001];\n Pair[] a = new Pair[n];\n for (int i = 0; i < n; i++) {\n a[i] = new Pair(sc.nextInt(), i);\n }\n Arrays.sort(a);\n for (int i = 0; i < n; i++) {\n idx[i] = a[i].idx;\n }\n SegmentTree st = new SegmentTree(n + n);\n long res = 0;\n int startIdx = 0;\n TreeSet indices = new TreeSet<>();\n for (int i = 0; i < n; i++) {\n if (!indices.isEmpty()) {\n Integer curIdx1 = indices.higher(startIdx - 1);\n Integer curIdx2 = indices.first();\n int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n indices.remove(chosen);\n if (startIdx == chosen) {\n res++;\n startIdx = (startIdx + 1) % n;\n } else {\n int wantedIdx = chosen - 1;\n int nstartIdx = (chosen + 1) % n;\n if (startIdx > wantedIdx) wantedIdx += n;\n res += st.query(startIdx, wantedIdx) + 1;\n startIdx = nstartIdx;\n }\n st.update(chosen);\n st.update(chosen + n);\n } else {\n indices.add(idx[i]);\n for (int j = i + 1; j < n; j++)\n if (a[j].num == a[i].num) indices.add(idx[j]);\n else break;\n i--;\n }\n }\n\n out.println(res);\n out.flush();\n out.close();\n }\n\n static class SegmentTree {\n int n;\n int[] t;\n\n SegmentTree(int nn) {\n n = nn;\n t = new int[n << 1 << 1];\n build(1, 0, n - 1);\n }\n\n void build(int node, int s, int e) {\n if (s == e) t[node] = 1;\n else {\n int mid = (s + e) >> 1;\n build(node << 1, s, mid);\n build(node << 1 | 1, mid + 1, e);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n void update(int idx) {\n update(1, 0, n - 1, idx);\n }\n\n void update(int node, int s, int e, int idx) {\n if (s == e && s == idx) t[node] = 0;\n else if (idx > e || idx < s) return;\n else {\n int mid = (s + e) >> 1;\n update(node << 1, s, mid, idx);\n update(node << 1 | 1, mid + 1, e, idx);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n int query(int s, int e) {\n return query(1, 0, n - 1, s, e);\n }\n\n int query(int node, int s, int e, int l, int r) {\n if (s >= l && e <= r) return t[node];\n else if (s > r || e < l) return 0;\n else {\n int mid = (s + e) >> 1;\n return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n }\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class E {\n- static class Pair implements Comparable {\n- int num, idx;\n+public class e {\n \n- Pair(int n, int i) {\n- num = n;\n- idx = i;\n+ public static int n;\n+ public static ArrayList list;\n+\n+ public static void main(String[] args) throws Exception {\n+\n+ BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n+ n = Integer.parseInt(stdin.readLine());\n+ StringTokenizer tok = new StringTokenizer(stdin.readLine());\n+ list = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = Integer.parseInt(tok.nextToken());\n+ list.add(new item(x, i));\n+ }\n+ Collections.sort(list);\n+\n+ System.out.println(solve());\n+ }\n+\n+ public static long solve() {\n+\n+ int i = 0;\n+\n+ while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n+ i++;\n+\n+ if (i == n) return n;\n+\n+ while (i < n) {\n+\n+ int j = i;\n+ while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n+\n+ if (j > i) {\n+\n+ int lastpos = list.get(i - 1).index;\n+\n+ int k = -1;\n+ for (k = i; k <= j; k++) {\n+ if (list.get(k).index > lastpos) {\n+ break;\n+ }\n+ }\n+\n+ if (k > i) {\n+\n+ item[] tmp = new item[j - i + 1];\n+ for (int z = i; z <= j; z++) {\n+ int ind = k + z - i;\n+ if (ind > j) ind -= (j - i + 1);\n+ tmp[z - i] = list.get(ind);\n+ }\n+ for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n+ }\n+ }\n+\n+ i = j + 1;\n }\n \n- @Override\n- public int compareTo(Pair pair) {\n- return num - pair.num;\n+ int[] arr = new int[n];\n+ for (i = 0; i < n; i++) {\n+ arr[i] = list.get(i).index + 1;\n+ }\n+\n+ long res = 0;\n+ bit mybit = new bit(n);\n+\n+ for (i = 0; i < n; i++) {\n+\n+ if (i == 0) {\n+ res += arr[i];\n+ } else {\n+\n+ if (arr[i] > arr[i - 1]) {\n+ int range = arr[i] - arr[i - 1];\n+\n+ res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n+ } else {\n+ int range = arr[i - 1] - arr[i] - 1;\n+ range = n - range;\n+ long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n+\n+ res += (range - used);\n+ }\n+ }\n+\n+ mybit.add(arr[i], 1L);\n+ }\n+\n+ return res;\n+ }\n+}\n+\n+class item implements Comparable {\n+\n+ public int value;\n+ public int index;\n+\n+ public item(int v, int i) {\n+ value = v;\n+ index = i;\n+ }\n+\n+ public int compareTo(item other) {\n+ if (this.value != other.value) return this.value - other.value;\n+ return this.index - other.index;\n+ }\n+}\n+\n+class bit {\n+\n+ public long[] cumfreq;\n+\n+ public bit(int n) {\n+\n+ int size = 1;\n+ while (size < n) size <<= 1;\n+ n = size;\n+\n+ cumfreq = new long[n + 1];\n+ }\n+\n+ public void add(int index, long value) {\n+ while (index < cumfreq.length) {\n+ cumfreq[index] += value;\n+ index += Integer.lowestOneBit(index);\n }\n }\n \n- public static void main(String[] args) throws Exception {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- int[] idx = new int[100_001];\n- Pair[] a = new Pair[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = new Pair(sc.nextInt(), i);\n+ public long sum(int index) {\n+ long ans = 0;\n+ while (index > 0) {\n+ ans += cumfreq[index];\n+ index -= (Integer.lowestOneBit(index));\n }\n- Arrays.sort(a);\n- for (int i = 0; i < n; i++) {\n- idx[i] = a[i].idx;\n- }\n- SegmentTree st = new SegmentTree(n + n);\n- long res = 0;\n- int startIdx = 0;\n- TreeSet indices = new TreeSet<>();\n- for (int i = 0; i < n; i++) {\n- if (!indices.isEmpty()) {\n- Integer curIdx1 = indices.higher(startIdx - 1);\n- Integer curIdx2 = indices.first();\n- int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n- indices.remove(chosen);\n- if (startIdx == chosen) {\n- res++;\n- startIdx = (startIdx + 1) % n;\n- } else {\n- int wantedIdx = chosen - 1;\n- int nstartIdx = (chosen + 1) % n;\n- if (startIdx > wantedIdx) wantedIdx += n;\n- res += st.query(startIdx, wantedIdx) + 1;\n- startIdx = nstartIdx;\n- }\n- st.update(chosen);\n- st.update(chosen + n);\n- } else {\n- indices.add(idx[i]);\n- for (int j = i + 1; j < n; j++)\n- if (a[j].num == a[i].num) indices.add(idx[j]);\n- else break;\n- i--;\n- }\n- }\n-\n- out.println(res);\n- out.flush();\n- out.close();\n+ return ans;\n }\n \n- static class SegmentTree {\n- int n;\n- int[] t;\n-\n- SegmentTree(int nn) {\n- n = nn;\n- t = new int[n << 1 << 1];\n- build(1, 0, n - 1);\n- }\n-\n- void build(int node, int s, int e) {\n- if (s == e) t[node] = 1;\n- else {\n- int mid = (s + e) >> 1;\n- build(node << 1, s, mid);\n- build(node << 1 | 1, mid + 1, e);\n- t[node] = t[node << 1] + t[node << 1 | 1];\n- }\n- }\n-\n- void update(int idx) {\n- update(1, 0, n - 1, idx);\n- }\n-\n- void update(int node, int s, int e, int idx) {\n- if (s == e && s == idx) t[node] = 0;\n- else if (idx > e || idx < s) return;\n- else {\n- int mid = (s + e) >> 1;\n- update(node << 1, s, mid, idx);\n- update(node << 1 | 1, mid + 1, e, idx);\n- t[node] = t[node << 1] + t[node << 1 | 1];\n- }\n- }\n-\n- int query(int s, int e) {\n- return query(1, 0, n - 1, s, e);\n- }\n-\n- int query(int node, int s, int e, int l, int r) {\n- if (s >= l && e <= r) return t[node];\n- else if (s > r || e < l) return 0;\n- else {\n- int mid = (s + e) >> 1;\n- return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n- }\n- }\n+ public long sum(int low, int high) {\n+ return sum(high) - sum(low - 1);\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n+ public long all() {\n+ return sum(cumfreq.length - 1);\n+ }\n \n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n+ public long atOrAbove(int index) {\n+ long sub = 0;\n+ if (index > 0) sub = sum(index - 1);\n+ return all() - sub;\n }\n }", "output": "FASTER 1.5453", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 2.9187, "pair_id": "java_12291_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class E {\n static class Pair implements Comparable {\n int num, idx;\n\n Pair(int n, int i) {\n num = n;\n idx = i;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return num - pair.num;\n }\n }\n\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = sc.nextInt();\n int[] idx = new int[100_001];\n Pair[] a = new Pair[n];\n for (int i = 0; i < n; i++) {\n a[i] = new Pair(sc.nextInt(), i);\n }\n Arrays.sort(a);\n for (int i = 0; i < n; i++) {\n idx[i] = a[i].idx;\n }\n SegmentTree st = new SegmentTree(n + n);\n long res = 0;\n int startIdx = 0;\n TreeSet indices = new TreeSet<>();\n for (int i = 0; i < n; i++) {\n if (!indices.isEmpty()) {\n Integer curIdx1 = indices.higher(startIdx - 1);\n Integer curIdx2 = indices.first();\n int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n indices.remove(chosen);\n if (startIdx == chosen) {\n res++;\n startIdx = (startIdx + 1) % n;\n } else {\n int wantedIdx = chosen - 1;\n int nstartIdx = (chosen + 1) % n;\n if (startIdx > wantedIdx) wantedIdx += n;\n res += st.query(startIdx, wantedIdx) + 1;\n startIdx = nstartIdx;\n }\n st.update(chosen);\n st.update(chosen + n);\n } else {\n indices.add(idx[i]);\n for (int j = i + 1; j < n; j++)\n if (a[j].num == a[i].num) indices.add(idx[j]);\n else break;\n i--;\n }\n }\n\n out.println(res);\n out.flush();\n out.close();\n }\n\n static class SegmentTree {\n int n;\n int[] t;\n\n SegmentTree(int nn) {\n n = nn;\n t = new int[n << 1 << 1];\n build(1, 0, n - 1);\n }\n\n void build(int node, int s, int e) {\n if (s == e) t[node] = 1;\n else {\n int mid = (s + e) >> 1;\n build(node << 1, s, mid);\n build(node << 1 | 1, mid + 1, e);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n void update(int idx) {\n update(1, 0, n - 1, idx);\n }\n\n void update(int node, int s, int e, int idx) {\n if (s == e && s == idx) t[node] = 0;\n else if (idx > e || idx < s) return;\n else {\n int mid = (s + e) >> 1;\n update(node << 1, s, mid, idx);\n update(node << 1 | 1, mid + 1, e, idx);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n int query(int s, int e) {\n return query(1, 0, n - 1, s, e);\n }\n\n int query(int node, int s, int e, int l, int r) {\n if (s >= l && e <= r) return t[node];\n else if (s > r || e < l) return 0;\n else {\n int mid = (s + e) >> 1;\n return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n }\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class e {\n+public class E {\n+ static class Pair implements Comparable {\n+ int num, idx;\n \n- public static int n;\n- public static ArrayList list;\n-\n- public static void main(String[] args) throws Exception {\n-\n- BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n- n = Integer.parseInt(stdin.readLine());\n- StringTokenizer tok = new StringTokenizer(stdin.readLine());\n- list = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = Integer.parseInt(tok.nextToken());\n- list.add(new item(x, i));\n- }\n- Collections.sort(list);\n-\n- System.out.println(solve());\n- }\n-\n- public static long solve() {\n-\n- int i = 0;\n-\n- while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n- i++;\n-\n- if (i == n) return n;\n-\n- while (i < n) {\n-\n- int j = i;\n- while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n-\n- if (j > i) {\n-\n- int lastpos = list.get(i - 1).index;\n-\n- int k = -1;\n- for (k = i; k <= j; k++) {\n- if (list.get(k).index > lastpos) {\n- break;\n- }\n- }\n-\n- if (k > i) {\n-\n- item[] tmp = new item[j - i + 1];\n- for (int z = i; z <= j; z++) {\n- int ind = k + z - i;\n- if (ind > j) ind -= (j - i + 1);\n- tmp[z - i] = list.get(ind);\n- }\n- for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n- }\n- }\n-\n- i = j + 1;\n+ Pair(int n, int i) {\n+ num = n;\n+ idx = i;\n }\n \n- int[] arr = new int[n];\n- for (i = 0; i < n; i++) {\n- arr[i] = list.get(i).index + 1;\n- }\n-\n- long res = 0;\n- bit mybit = new bit(n);\n-\n- for (i = 0; i < n; i++) {\n-\n- if (i == 0) {\n- res += arr[i];\n- } else {\n-\n- if (arr[i] > arr[i - 1]) {\n- int range = arr[i] - arr[i - 1];\n-\n- res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n- } else {\n- int range = arr[i - 1] - arr[i] - 1;\n- range = n - range;\n- long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n-\n- res += (range - used);\n- }\n- }\n-\n- mybit.add(arr[i], 1L);\n- }\n-\n- return res;\n- }\n-}\n-\n-class item implements Comparable {\n-\n- public int value;\n- public int index;\n-\n- public item(int v, int i) {\n- value = v;\n- index = i;\n- }\n-\n- public int compareTo(item other) {\n- if (this.value != other.value) return this.value - other.value;\n- return this.index - other.index;\n- }\n-}\n-\n-class bit {\n-\n- public long[] cumfreq;\n-\n- public bit(int n) {\n-\n- int size = 1;\n- while (size < n) size <<= 1;\n- n = size;\n-\n- cumfreq = new long[n + 1];\n- }\n-\n- public void add(int index, long value) {\n- while (index < cumfreq.length) {\n- cumfreq[index] += value;\n- index += Integer.lowestOneBit(index);\n+ @Override\n+ public int compareTo(Pair pair) {\n+ return num - pair.num;\n }\n }\n \n- public long sum(int index) {\n- long ans = 0;\n- while (index > 0) {\n- ans += cumfreq[index];\n- index -= (Integer.lowestOneBit(index));\n+ public static void main(String[] args) throws Exception {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ int[] idx = new int[100_001];\n+ Pair[] a = new Pair[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = new Pair(sc.nextInt(), i);\n }\n- return ans;\n+ Arrays.sort(a);\n+ for (int i = 0; i < n; i++) {\n+ idx[i] = a[i].idx;\n+ }\n+ SegmentTree st = new SegmentTree(n + n);\n+ long res = 0;\n+ int startIdx = 0;\n+ TreeSet indices = new TreeSet<>();\n+ for (int i = 0; i < n; i++) {\n+ if (!indices.isEmpty()) {\n+ Integer curIdx1 = indices.higher(startIdx - 1);\n+ Integer curIdx2 = indices.first();\n+ int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n+ indices.remove(chosen);\n+ if (startIdx == chosen) {\n+ res++;\n+ startIdx = (startIdx + 1) % n;\n+ } else {\n+ int wantedIdx = chosen - 1;\n+ int nstartIdx = (chosen + 1) % n;\n+ if (startIdx > wantedIdx) wantedIdx += n;\n+ res += st.query(startIdx, wantedIdx) + 1;\n+ startIdx = nstartIdx;\n+ }\n+ st.update(chosen);\n+ st.update(chosen + n);\n+ } else {\n+ indices.add(idx[i]);\n+ for (int j = i + 1; j < n; j++)\n+ if (a[j].num == a[i].num) indices.add(idx[j]);\n+ else break;\n+ i--;\n+ }\n+ }\n+\n+ out.println(res);\n+ out.flush();\n+ out.close();\n }\n \n- public long sum(int low, int high) {\n- return sum(high) - sum(low - 1);\n+ static class SegmentTree {\n+ int n;\n+ int[] t;\n+\n+ SegmentTree(int nn) {\n+ n = nn;\n+ t = new int[n << 1 << 1];\n+ build(1, 0, n - 1);\n+ }\n+\n+ void build(int node, int s, int e) {\n+ if (s == e) t[node] = 1;\n+ else {\n+ int mid = (s + e) >> 1;\n+ build(node << 1, s, mid);\n+ build(node << 1 | 1, mid + 1, e);\n+ t[node] = t[node << 1] + t[node << 1 | 1];\n+ }\n+ }\n+\n+ void update(int idx) {\n+ update(1, 0, n - 1, idx);\n+ }\n+\n+ void update(int node, int s, int e, int idx) {\n+ if (s == e && s == idx) t[node] = 0;\n+ else if (idx > e || idx < s) return;\n+ else {\n+ int mid = (s + e) >> 1;\n+ update(node << 1, s, mid, idx);\n+ update(node << 1 | 1, mid + 1, e, idx);\n+ t[node] = t[node << 1] + t[node << 1 | 1];\n+ }\n+ }\n+\n+ int query(int s, int e) {\n+ return query(1, 0, n - 1, s, e);\n+ }\n+\n+ int query(int node, int s, int e, int l, int r) {\n+ if (s >= l && e <= r) return t[node];\n+ else if (s > r || e < l) return 0;\n+ else {\n+ int mid = (s + e) >> 1;\n+ return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n+ }\n+ }\n }\n \n- public long all() {\n- return sum(cumfreq.length - 1);\n- }\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- public long atOrAbove(int index) {\n- long sub = 0;\n- if (index > 0) sub = sum(index - 1);\n- return all() - sub;\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n+ }\n }\n }", "output": "SLOWER 1.5453", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 2.9187, "pair_id": "java_12291_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Random;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n+public class e {\n+\n+ public static int n;\n+ public static ArrayList list;\n+\n+ public static void main(String[] args) throws Exception {\n+\n+ BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n+ n = Integer.parseInt(stdin.readLine());\n+ StringTokenizer tok = new StringTokenizer(stdin.readLine());\n+ list = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = Integer.parseInt(tok.nextToken());\n+ list.add(new item(x, i));\n+ }\n+ Collections.sort(list);\n+\n+ System.out.println(solve());\n }\n \n- static class TaskB {\n- Random random = new Random();\n+ public static long solve() {\n \n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int[] a = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- int k = repaint(a);\n- int[] nextSame = new int[n];\n- int[] nextLarger = new int[n];\n- int[] last = new int[k + 1];\n- Arrays.fill(last, -1);\n- for (int step = 0; step < 2 * n; step++) {\n- int i = -step % n;\n- if (i < 0) {\n- i += n;\n+ int i = 0;\n+\n+ while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n+ i++;\n+\n+ if (i == n) return n;\n+\n+ while (i < n) {\n+\n+ int j = i;\n+ while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n+\n+ if (j > i) {\n+\n+ int lastpos = list.get(i - 1).index;\n+\n+ int k = -1;\n+ for (k = i; k <= j; k++) {\n+ if (list.get(k).index > lastpos) {\n+ break;\n+ }\n }\n- nextSame[i] = last[a[i]];\n- nextLarger[i] = last[a[i] + 1];\n- last[a[i]] = i;\n+\n+ if (k > i) {\n+\n+ item[] tmp = new item[j - i + 1];\n+ for (int z = i; z <= j; z++) {\n+ int ind = k + z - i;\n+ if (ind > j) ind -= (j - i + 1);\n+ tmp[z - i] = list.get(ind);\n+ }\n+ for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n+ }\n }\n \n- int[] tree = new int[n];\n- for (int i = 0; i < n; i++) {\n- add(tree, i, 1);\n- }\n- int first = -1;\n- for (int i = 0; i < n; i++) {\n- if (a[i] == 0) {\n- first = i;\n- break;\n+ i = j + 1;\n+ }\n+\n+ int[] arr = new int[n];\n+ for (i = 0; i < n; i++) {\n+ arr[i] = list.get(i).index + 1;\n+ }\n+\n+ long res = 0;\n+ bit mybit = new bit(n);\n+\n+ for (i = 0; i < n; i++) {\n+\n+ if (i == 0) {\n+ res += arr[i];\n+ } else {\n+\n+ if (arr[i] > arr[i - 1]) {\n+ int range = arr[i] - arr[i - 1];\n+\n+ res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n+ } else {\n+ int range = arr[i - 1] - arr[i] - 1;\n+ range = n - range;\n+ long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n+\n+ res += (range - used);\n }\n }\n- long ans = 0;\n- int x = 0;\n- for (int i = 0; i < n; i++) {\n- int nx;\n- if (i == 0) {\n- nx = first;\n- } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n- nx = nextSame[x];\n- } else {\n- nx = nextLarger[x];\n- }\n- if (x <= nx) {\n- ans += sum(tree, x, nx);\n- } else {\n- ans += sum(tree, x, n - 1);\n- ans += sum(tree, 0, nx);\n- }\n- x = nx;\n- add(tree, x, -1);\n- }\n- out.println(ans);\n+\n+ mybit.add(arr[i], 1L);\n }\n \n- private void add(int[] tree, int pos, int val) {\n- while (pos < tree.length) {\n- tree[pos] += val;\n- pos |= pos + 1;\n- }\n- }\n+ return res;\n+ }\n+}\n \n- private int sum(int[] tree, int l, int r) {\n- return sum(tree, r) - sum(tree, l - 1);\n- }\n+class item implements Comparable {\n \n- private int sum(int[] tree, int r) {\n- int res = 0;\n- while (r >= 0) {\n- res += tree[r];\n- r = (r & (r + 1)) - 1;\n- }\n- return res;\n- }\n+ public int value;\n+ public int index;\n \n- private int repaint(int[] a) {\n- int[] b = a.clone();\n- randomShuffle(b);\n- Arrays.sort(b);\n- int k = 0;\n- for (int i = 0; i < b.length; i++) {\n- if (i == 0 || b[i] != b[i - 1]) {\n- b[k++] = b[i];\n- }\n- }\n- for (int i = 0; i < a.length; i++) {\n- a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n- }\n- return k;\n- }\n+ public item(int v, int i) {\n+ value = v;\n+ index = i;\n+ }\n \n- private void randomShuffle(int[] a) {\n- for (int i = 0; i < a.length; i++) {\n- int j = random.nextInt(i + 1);\n- int t = a[i];\n- a[i] = a[j];\n- a[j] = t;\n- }\n+ public int compareTo(item other) {\n+ if (this.value != other.value) return this.value - other.value;\n+ return this.index - other.index;\n+ }\n+}\n+\n+class bit {\n+\n+ public long[] cumfreq;\n+\n+ public bit(int n) {\n+\n+ int size = 1;\n+ while (size < n) size <<= 1;\n+ n = size;\n+\n+ cumfreq = new long[n + 1];\n+ }\n+\n+ public void add(int index, long value) {\n+ while (index < cumfreq.length) {\n+ cumfreq[index] += value;\n+ index += Integer.lowestOneBit(index);\n }\n }\n \n- static class FastScanner {\n- private BufferedReader in;\n- private StringTokenizer st;\n+ public long sum(int index) {\n+ long ans = 0;\n+ while (index > 0) {\n+ ans += cumfreq[index];\n+ index -= (Integer.lowestOneBit(index));\n+ }\n+ return ans;\n+ }\n \n- public FastScanner(InputStream stream) {\n- in = new BufferedReader(new InputStreamReader(stream));\n- }\n+ public long sum(int low, int high) {\n+ return sum(high) - sum(low - 1);\n+ }\n \n- public String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- String rl = in.readLine();\n- if (rl == null) {\n- return null;\n- }\n- st = new StringTokenizer(rl);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return st.nextToken();\n- }\n+ public long all() {\n+ return sum(cumfreq.length - 1);\n+ }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ public long atOrAbove(int index) {\n+ long sub = 0;\n+ if (index > 0) sub = sum(index - 1);\n+ return all() - sub;\n }\n }", "output": "FASTER 1.3578", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 2.563, "pair_id": "java_12289_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Random;\n+import java.util.StringTokenizer;\n \n-public class e {\n-\n- public static int n;\n- public static ArrayList list;\n-\n- public static void main(String[] args) throws Exception {\n-\n- BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n- n = Integer.parseInt(stdin.readLine());\n- StringTokenizer tok = new StringTokenizer(stdin.readLine());\n- list = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = Integer.parseInt(tok.nextToken());\n- list.add(new item(x, i));\n- }\n- Collections.sort(list);\n-\n- System.out.println(solve());\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- public static long solve() {\n+ static class TaskB {\n+ Random random = new Random();\n \n- int i = 0;\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int[] a = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ int k = repaint(a);\n+ int[] nextSame = new int[n];\n+ int[] nextLarger = new int[n];\n+ int[] last = new int[k + 1];\n+ Arrays.fill(last, -1);\n+ for (int step = 0; step < 2 * n; step++) {\n+ int i = -step % n;\n+ if (i < 0) {\n+ i += n;\n+ }\n+ nextSame[i] = last[a[i]];\n+ nextLarger[i] = last[a[i] + 1];\n+ last[a[i]] = i;\n+ }\n \n- while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n- i++;\n-\n- if (i == n) return n;\n-\n- while (i < n) {\n-\n- int j = i;\n- while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n-\n- if (j > i) {\n-\n- int lastpos = list.get(i - 1).index;\n-\n- int k = -1;\n- for (k = i; k <= j; k++) {\n- if (list.get(k).index > lastpos) {\n- break;\n- }\n- }\n-\n- if (k > i) {\n-\n- item[] tmp = new item[j - i + 1];\n- for (int z = i; z <= j; z++) {\n- int ind = k + z - i;\n- if (ind > j) ind -= (j - i + 1);\n- tmp[z - i] = list.get(ind);\n- }\n- for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n+ int[] tree = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ add(tree, i, 1);\n+ }\n+ int first = -1;\n+ for (int i = 0; i < n; i++) {\n+ if (a[i] == 0) {\n+ first = i;\n+ break;\n }\n }\n-\n- i = j + 1;\n+ long ans = 0;\n+ int x = 0;\n+ for (int i = 0; i < n; i++) {\n+ int nx;\n+ if (i == 0) {\n+ nx = first;\n+ } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n+ nx = nextSame[x];\n+ } else {\n+ nx = nextLarger[x];\n+ }\n+ if (x <= nx) {\n+ ans += sum(tree, x, nx);\n+ } else {\n+ ans += sum(tree, x, n - 1);\n+ ans += sum(tree, 0, nx);\n+ }\n+ x = nx;\n+ add(tree, x, -1);\n+ }\n+ out.println(ans);\n }\n \n- int[] arr = new int[n];\n- for (i = 0; i < n; i++) {\n- arr[i] = list.get(i).index + 1;\n+ private void add(int[] tree, int pos, int val) {\n+ while (pos < tree.length) {\n+ tree[pos] += val;\n+ pos |= pos + 1;\n+ }\n }\n \n- long res = 0;\n- bit mybit = new bit(n);\n+ private int sum(int[] tree, int l, int r) {\n+ return sum(tree, r) - sum(tree, l - 1);\n+ }\n \n- for (i = 0; i < n; i++) {\n+ private int sum(int[] tree, int r) {\n+ int res = 0;\n+ while (r >= 0) {\n+ res += tree[r];\n+ r = (r & (r + 1)) - 1;\n+ }\n+ return res;\n+ }\n \n- if (i == 0) {\n- res += arr[i];\n- } else {\n-\n- if (arr[i] > arr[i - 1]) {\n- int range = arr[i] - arr[i - 1];\n-\n- res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n- } else {\n- int range = arr[i - 1] - arr[i] - 1;\n- range = n - range;\n- long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n-\n- res += (range - used);\n+ private int repaint(int[] a) {\n+ int[] b = a.clone();\n+ randomShuffle(b);\n+ Arrays.sort(b);\n+ int k = 0;\n+ for (int i = 0; i < b.length; i++) {\n+ if (i == 0 || b[i] != b[i - 1]) {\n+ b[k++] = b[i];\n }\n }\n-\n- mybit.add(arr[i], 1L);\n+ for (int i = 0; i < a.length; i++) {\n+ a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n+ }\n+ return k;\n }\n \n- return res;\n- }\n-}\n-\n-class item implements Comparable {\n-\n- public int value;\n- public int index;\n-\n- public item(int v, int i) {\n- value = v;\n- index = i;\n- }\n-\n- public int compareTo(item other) {\n- if (this.value != other.value) return this.value - other.value;\n- return this.index - other.index;\n- }\n-}\n-\n-class bit {\n-\n- public long[] cumfreq;\n-\n- public bit(int n) {\n-\n- int size = 1;\n- while (size < n) size <<= 1;\n- n = size;\n-\n- cumfreq = new long[n + 1];\n- }\n-\n- public void add(int index, long value) {\n- while (index < cumfreq.length) {\n- cumfreq[index] += value;\n- index += Integer.lowestOneBit(index);\n+ private void randomShuffle(int[] a) {\n+ for (int i = 0; i < a.length; i++) {\n+ int j = random.nextInt(i + 1);\n+ int t = a[i];\n+ a[i] = a[j];\n+ a[j] = t;\n+ }\n }\n }\n \n- public long sum(int index) {\n- long ans = 0;\n- while (index > 0) {\n- ans += cumfreq[index];\n- index -= (Integer.lowestOneBit(index));\n+ static class FastScanner {\n+ private BufferedReader in;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream stream) {\n+ in = new BufferedReader(new InputStreamReader(stream));\n }\n- return ans;\n- }\n \n- public long sum(int low, int high) {\n- return sum(high) - sum(low - 1);\n- }\n+ public String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ String rl = in.readLine();\n+ if (rl == null) {\n+ return null;\n+ }\n+ st = new StringTokenizer(rl);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return st.nextToken();\n+ }\n \n- public long all() {\n- return sum(cumfreq.length - 1);\n- }\n-\n- public long atOrAbove(int index) {\n- long sub = 0;\n- if (index > 0) sub = sum(index - 1);\n- return all() - sub;\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "SLOWER 1.3578", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 2.563, "pair_id": "java_12289_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n+import java.io.BufferedInputStream;\n import java.util.*;\n \n public class Main {\n \n+ public static TreeMap> treeSetTreeMap = new TreeMap<>();\n+ public static int[] c = new int[100_000 + 5];\n+ public static int n;\n+\n+ public static int lowbit(int x) {\n+ return x & (-x);\n+ }\n+\n+ public static int query(int t) {\n+ int ans = 0;\n+ while (t > 0) {\n+ ans += c[t];\n+ t -= lowbit(t);\n+ }\n+ return ans;\n+ }\n+\n+ public static void update(int p, int value) {\n+ while (p <= n) {\n+ c[p] += value;\n+ p += lowbit(p);\n+ }\n+ }\n+\n public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- Task solver = new Task();\n- solver.solve(in, out);\n- out.close();\n- }\n-}\n-\n-class Task {\n-\n- public void solve(Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- List a = new ArrayList<>(n);\n+ Scanner sc = new Scanner(new BufferedInputStream(System.in));\n+ n = sc.nextInt();\n+ TreeSet tt = new TreeSet<>();\n \n for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- a.add(new Vect(x, i));\n+ int a = sc.nextInt();\n+ TreeSet treeSet = treeSetTreeMap.get(a);\n+ if (treeSet == null) {\n+ treeSet = new TreeSet<>();\n+ }\n+ treeSet.add(i + 1);\n+ tt.add(i + 1);\n+ treeSetTreeMap.put(a, treeSet);\n+ update(i + 1, 1);\n }\n- a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n \n- int val = a.get(0).a;\n- int start = 0;\n- int mid = -1;\n- int pos = -1;\n- for (int i = 0; i < n; i++) {\n- Vect v = a.get(i);\n- if (val == v.a) {\n- if (v.b > pos && mid == -1) {\n- mid = i;\n+ int tn = n;\n+ Integer pos = 1;\n+ long ans = 0;\n+\n+ Set key1 = treeSetTreeMap.keySet();\n+\n+ TreeSet key = new TreeSet<>(key1);\n+\n+ for (Integer node : key) {\n+\n+ TreeSet values = treeSetTreeMap.get(node);\n+ while (!values.isEmpty()) {\n+ int sum1 = query(pos);\n+ Integer j = values.ceiling(pos);\n+ if (j == null) {\n+ j = values.first();\n }\n- }\n- if (val != v.a) {\n- if (mid == -1) {\n- mid = i;\n+ values.remove(j);\n+ int sum2 = query(j);\n+ if (sum1 <= sum2) {\n+ ans += sum2 - sum1 + 1;\n+ } else {\n+ ans += tn + sum2 - sum1 + 1;\n }\n- swap(a, start, mid, i);\n- start = i;\n- pos = a.get(i - 1).b;\n- mid = -1;\n- val = a.get(i).a;\n- if (v.b > pos && mid == -1) {\n- mid = i;\n+ update(j, -1);\n+ tt.remove(j);\n+ tn -= 1;\n+ if (tn == 0) {\n+ break;\n+ }\n+ pos = tt.higher(j);\n+ if (pos == null) {\n+ pos = tt.first();\n }\n }\n }\n- if (mid == -1) {\n- mid = n;\n- }\n- swap(a, start, mid, n);\n-\n- long sum = 0;\n- int t = n;\n- int prev = -1;\n- for (int i = 0; i < a.size(); i++) {\n- int cur = a.get(i).b;\n- if (cur < prev) {\n- sum += t;\n- t = n - i;\n- }\n- prev = cur;\n- }\n- sum += t;\n- System.out.println(sum);\n- }\n-\n- public void swap(List v, int s, int mid, int f) {\n- List temp = new ArrayList<>(mid - s);\n- for (int i = s; i < mid; i++) {\n- temp.add(v.get(i));\n- }\n- for (int i = mid; i < f; i++) {\n- v.set(i - temp.size(), v.get(i));\n- }\n- for (int i = 0; i < temp.size(); i++) {\n- v.set(f - temp.size() + i, temp.get(i));\n- }\n+ System.out.println(ans);\n }\n }\n-\n-class Utils {\n-\n- public static int binarySearch(int[] a, int key) {\n- int s = 0;\n- int f = a.length;\n- while (f > s) {\n- int mid = (s + f) / 2;\n- if (a[mid] > key) {\n- f = mid - 1;\n- } else if (a[mid] <= key) {\n- s = mid + 1;\n- }\n- }\n- return -1;\n- }\n-\n- public static long gcd(long a, long b) {\n- return b != 0 ? gcd(b, a % b) : a;\n- }\n-\n- public static long lcm(long a, long b) {\n- return a / gcd(a, b) * b;\n- }\n-\n- static List prime(int number) {\n- List a = new ArrayList<>();\n- for (int i = 2; i * i <= number; i++) {\n- if (number % i == 0) {\n- a.add(i);\n- number /= i;\n- i = 1;\n- }\n- }\n- a.add(number);\n- return a;\n- }\n-}\n-\n-class Pair {\n- public T a;\n- public U b;\n-\n- public Pair(T a, U b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Pair pair = (Pair) o;\n-\n- if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n- return b != null ? b.equals(pair.b) : pair.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Vect {\n- public int a;\n- public int b;\n-\n- public Vect(int a, int b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Vect vect = (Vect) o;\n-\n- if (a != vect.a) return false;\n- return b == vect.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Tri {\n- public int a;\n- public int b;\n- public int c;\n-\n- public Tri(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Tri tri = (Tri) o;\n-\n- if (a != tri.a) return false;\n- return b == tri.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Triple {\n- public T a;\n- public U b;\n- public P c;\n-\n- public Triple(T a, U b, P c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Triple triple = (Triple) o;\n-\n- if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n- return b != null ? b.equals(triple.b) : triple.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Scanner {\n- BufferedReader in;\n- StringTokenizer tok;\n-\n- public Scanner(InputStream in) {\n- this.in = new BufferedReader(new InputStreamReader(in));\n- tok = new StringTokenizer(\"\");\n- }\n-\n- private String tryReadNextLine() {\n- try {\n- return in.readLine();\n- } catch (Exception e) {\n- throw new InputMismatchException();\n- }\n- }\n-\n- public String nextToken() {\n- while (!tok.hasMoreTokens()) {\n- tok = new StringTokenizer(next());\n- }\n- return tok.nextToken();\n- }\n-\n- public String next() {\n- String newLine = tryReadNextLine();\n- if (newLine == null) throw new InputMismatchException();\n- return newLine;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(nextToken());\n- }\n-}", "output": "FASTER 2.9496", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 7.7254, "pair_id": "java_12283_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.*;\n \n public class Main {\n \n- public static TreeMap> treeSetTreeMap = new TreeMap<>();\n- public static int[] c = new int[100_000 + 5];\n- public static int n;\n-\n- public static int lowbit(int x) {\n- return x & (-x);\n- }\n-\n- public static int query(int t) {\n- int ans = 0;\n- while (t > 0) {\n- ans += c[t];\n- t -= lowbit(t);\n- }\n- return ans;\n- }\n-\n- public static void update(int p, int value) {\n- while (p <= n) {\n- c[p] += value;\n- p += lowbit(p);\n- }\n- }\n-\n public static void main(String[] args) {\n- Scanner sc = new Scanner(new BufferedInputStream(System.in));\n- n = sc.nextInt();\n- TreeSet tt = new TreeSet<>();\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ Task solver = new Task();\n+ solver.solve(in, out);\n+ out.close();\n+ }\n+}\n+\n+class Task {\n+\n+ public void solve(Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ List a = new ArrayList<>(n);\n \n for (int i = 0; i < n; i++) {\n- int a = sc.nextInt();\n- TreeSet treeSet = treeSetTreeMap.get(a);\n- if (treeSet == null) {\n- treeSet = new TreeSet<>();\n- }\n- treeSet.add(i + 1);\n- tt.add(i + 1);\n- treeSetTreeMap.put(a, treeSet);\n- update(i + 1, 1);\n- }\n-\n- int tn = n;\n- Integer pos = 1;\n- long ans = 0;\n-\n- Set key1 = treeSetTreeMap.keySet();\n-\n- TreeSet key = new TreeSet<>(key1);\n-\n- for (Integer node : key) {\n-\n- TreeSet values = treeSetTreeMap.get(node);\n- while (!values.isEmpty()) {\n- int sum1 = query(pos);\n- Integer j = values.ceiling(pos);\n- if (j == null) {\n- j = values.first();\n+ int x = in.nextInt();\n+ a.add(new Vect(x, i));\n+ }\n+ a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n+\n+ int val = a.get(0).a;\n+ int start = 0;\n+ int mid = -1;\n+ int pos = -1;\n+ for (int i = 0; i < n; i++) {\n+ Vect v = a.get(i);\n+ if (val == v.a) {\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n }\n- values.remove(j);\n- int sum2 = query(j);\n- if (sum1 <= sum2) {\n- ans += sum2 - sum1 + 1;\n- } else {\n- ans += tn + sum2 - sum1 + 1;\n+ }\n+ if (val != v.a) {\n+ if (mid == -1) {\n+ mid = i;\n }\n- update(j, -1);\n- tt.remove(j);\n- tn -= 1;\n- if (tn == 0) {\n- break;\n+ swap(a, start, mid, i);\n+ start = i;\n+ pos = a.get(i - 1).b;\n+ mid = -1;\n+ val = a.get(i).a;\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n }\n- pos = tt.higher(j);\n- if (pos == null) {\n- pos = tt.first();\n- }\n- }\n- }\n- System.out.println(ans);\n- }\n-}\n+ }\n+ }\n+ if (mid == -1) {\n+ mid = n;\n+ }\n+ swap(a, start, mid, n);\n+\n+ long sum = 0;\n+ int t = n;\n+ int prev = -1;\n+ for (int i = 0; i < a.size(); i++) {\n+ int cur = a.get(i).b;\n+ if (cur < prev) {\n+ sum += t;\n+ t = n - i;\n+ }\n+ prev = cur;\n+ }\n+ sum += t;\n+ System.out.println(sum);\n+ }\n+\n+ public void swap(List v, int s, int mid, int f) {\n+ List temp = new ArrayList<>(mid - s);\n+ for (int i = s; i < mid; i++) {\n+ temp.add(v.get(i));\n+ }\n+ for (int i = mid; i < f; i++) {\n+ v.set(i - temp.size(), v.get(i));\n+ }\n+ for (int i = 0; i < temp.size(); i++) {\n+ v.set(f - temp.size() + i, temp.get(i));\n+ }\n+ }\n+}\n+\n+class Utils {\n+\n+ public static int binarySearch(int[] a, int key) {\n+ int s = 0;\n+ int f = a.length;\n+ while (f > s) {\n+ int mid = (s + f) / 2;\n+ if (a[mid] > key) {\n+ f = mid - 1;\n+ } else if (a[mid] <= key) {\n+ s = mid + 1;\n+ }\n+ }\n+ return -1;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ return b != 0 ? gcd(b, a % b) : a;\n+ }\n+\n+ public static long lcm(long a, long b) {\n+ return a / gcd(a, b) * b;\n+ }\n+\n+ static List prime(int number) {\n+ List a = new ArrayList<>();\n+ for (int i = 2; i * i <= number; i++) {\n+ if (number % i == 0) {\n+ a.add(i);\n+ number /= i;\n+ i = 1;\n+ }\n+ }\n+ a.add(number);\n+ return a;\n+ }\n+}\n+\n+class Pair {\n+ public T a;\n+ public U b;\n+\n+ public Pair(T a, U b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Pair pair = (Pair) o;\n+\n+ if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n+ return b != null ? b.equals(pair.b) : pair.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Vect {\n+ public int a;\n+ public int b;\n+\n+ public Vect(int a, int b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Vect vect = (Vect) o;\n+\n+ if (a != vect.a) return false;\n+ return b == vect.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Tri {\n+ public int a;\n+ public int b;\n+ public int c;\n+\n+ public Tri(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Tri tri = (Tri) o;\n+\n+ if (a != tri.a) return false;\n+ return b == tri.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Triple {\n+ public T a;\n+ public U b;\n+ public P c;\n+\n+ public Triple(T a, U b, P c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Triple triple = (Triple) o;\n+\n+ if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n+ return b != null ? b.equals(triple.b) : triple.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Scanner {\n+ BufferedReader in;\n+ StringTokenizer tok;\n+\n+ public Scanner(InputStream in) {\n+ this.in = new BufferedReader(new InputStreamReader(in));\n+ tok = new StringTokenizer(\"\");\n+ }\n+\n+ private String tryReadNextLine() {\n+ try {\n+ return in.readLine();\n+ } catch (Exception e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+\n+ public String nextToken() {\n+ while (!tok.hasMoreTokens()) {\n+ tok = new StringTokenizer(next());\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ public String next() {\n+ String newLine = tryReadNextLine();\n+ if (newLine == null) throw new InputMismatchException();\n+ return newLine;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(nextToken());\n+ }\n+}", "output": "SLOWER 2.9496", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 7.7254, "pair_id": "java_12283_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n-\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- Task solver = new Task();\n- solver.solve(in, out);\n- out.close();\n+public class CF831E_3 {\n+ public static int index;\n+\n+ public static void main(String[] args) throws Exception {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ int n = in.nextInt();\n+ int arr[] = new int[n + 1];\n+ segTree seg = new segTree(n);\n+ BIT bit = new BIT((int) 1e5 + 50);\n+ for (int i = 1; i <= n; i++) {\n+ arr[i] = in.nextInt();\n+ seg.update(i, arr[i]);\n+ bit.add(i);\n+ }\n+\n+ long sum = 0;\n+ int last = 0;\n+ Node min = seg.query(1, n);\n+ for (int i = 1; i <= n; i++) {\n+ Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n+ if (node2.n <= node1.n) min = node2;\n+ else min = node1;\n+\n+ if (min.idx > last) {\n+ int h = 0, l = 0;\n+ l = bit.low(last + 1);\n+ h = bit.low(min.idx + 1);\n+\n+ sum += (long) (h - l);\n+ } else {\n+ int h = 0, l = 0;\n+ h = bit.high(last);\n+ l = bit.low(min.idx + 1);\n+\n+ sum += (long) (h + l);\n+ }\n+ bit.remove(min.idx);\n+ last = min.idx;\n+ seg.update(min.idx, (int) 2e9);\n+ }\n+\n+ pw.println(sum);\n+\n+ pw.close();\n+ }\n+\n+ static class BIT {\n+ public int bit[], n;\n+\n+ public BIT(int nn) {\n+ n = nn;\n+ bit = new int[n + 1];\n+ }\n+\n+ int low(int x) {\n+ return sum(x - 1);\n+ }\n+\n+ int high(int x) {\n+ return sum(n) - sum(x);\n+ }\n+\n+ void add(int x) {\n+ add(x, 1);\n+ }\n+\n+ void remove(int x) {\n+ add(x, -1);\n+ }\n+\n+ void add(int index, int value) {\n+ for (; index < bit.length; index = index + (index & -index)) {\n+ bit[index] += value;\n+ }\n+ }\n+\n+ int sum(int index) {\n+ int sum = 0;\n+ for (; index > 0; index = index - (index & -index)) {\n+ sum += bit[index];\n+ }\n+ return sum;\n+ }\n+ }\n+\n+ static class Node implements Comparable {\n+ int n, idx;\n+\n+ Node(int N, int i) {\n+ n = N;\n+ idx = i;\n+ }\n+\n+ public int compareTo(Node N) {\n+ if (n != N.n) return n - N.n;\n+ else return idx - N.idx;\n+ }\n+\n+ public String toString() {\n+ return n + \" \" + idx;\n+ }\n+ }\n+\n+ static class segTree {\n+ public int n;\n+ Node seg[];\n+\n+ public segTree(int N) {\n+ n = N;\n+ seg = new Node[4 * (int) 1e5];\n+ for (int i = 0; i < seg.length; i++) {\n+ seg[i] = new Node(0, 0);\n+ }\n+ }\n+\n+ public void update(int pos, int val) {\n+ update(1, 1, n, pos, val);\n+ }\n+\n+ public Node query(int l, int r) {\n+ if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n+ return query(1, 1, n, l, r);\n+ }\n+\n+ public void update(int p, int s, int e, int pos, int val) {\n+ if (s == pos && e == pos) {\n+ seg[p].n = val;\n+ seg[p].idx = pos;\n+ return;\n+ }\n+ if (s > pos || e < pos || s > e || e < s) return;\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ update(l, s, m, pos, val);\n+ update(r, m + 1, e, pos, val);\n+\n+ if (seg[l].n <= seg[r].n) {\n+ seg[p].n = seg[l].n;\n+ seg[p].idx = seg[l].idx;\n+ } else {\n+ seg[p].n = seg[r].n;\n+ seg[p].idx = seg[r].idx;\n+ }\n+ }\n+\n+ public Node query(int p, int s, int e, int a, int b) {\n+ if (s >= a && e <= b) {\n+ return seg[p];\n+ }\n+ if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ Node q1 = query(l, s, m, a, b);\n+ Node q2 = query(r, m + 1, e, a, b);\n+\n+ if (q1.n <= q2.n) {\n+ return q1;\n+ } else {\n+ return q2;\n+ }\n+ }\n+ }\n+\n+ static void debug(Object... obj) {\n+ System.err.println(Arrays.deepToString(obj));\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream));\n+ tokenizer = null;\n+ }\n+\n+ public String next() throws Exception {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens())\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ return tokenizer.nextToken();\n+ }\n+\n+ public String nextLine() throws Exception {\n+ String line = null;\n+ tokenizer = null;\n+ line = reader.readLine();\n+ return line;\n+ }\n+\n+ public int nextInt() throws Exception {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() throws Exception {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public long nextLong() throws Exception {\n+ return Long.parseLong(next());\n+ }\n }\n }\n-\n-class Task {\n-\n- public void solve(Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- List a = new ArrayList<>(n);\n-\n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- a.add(new Vect(x, i));\n- }\n- a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n-\n- int val = a.get(0).a;\n- int start = 0;\n- int mid = -1;\n- int pos = -1;\n- for (int i = 0; i < n; i++) {\n- Vect v = a.get(i);\n- if (val == v.a) {\n- if (v.b > pos && mid == -1) {\n- mid = i;\n- }\n- }\n- if (val != v.a) {\n- if (mid == -1) {\n- mid = i;\n- }\n- swap(a, start, mid, i);\n- start = i;\n- pos = a.get(i - 1).b;\n- mid = -1;\n- val = a.get(i).a;\n- if (v.b > pos && mid == -1) {\n- mid = i;\n- }\n- }\n- }\n- if (mid == -1) {\n- mid = n;\n- }\n- swap(a, start, mid, n);\n-\n- long sum = 0;\n- int t = n;\n- int prev = -1;\n- for (int i = 0; i < a.size(); i++) {\n- int cur = a.get(i).b;\n- if (cur < prev) {\n- sum += t;\n- t = n - i;\n- }\n- prev = cur;\n- }\n- sum += t;\n- System.out.println(sum);\n- }\n-\n- public void swap(List v, int s, int mid, int f) {\n- List temp = new ArrayList<>(mid - s);\n- for (int i = s; i < mid; i++) {\n- temp.add(v.get(i));\n- }\n- for (int i = mid; i < f; i++) {\n- v.set(i - temp.size(), v.get(i));\n- }\n- for (int i = 0; i < temp.size(); i++) {\n- v.set(f - temp.size() + i, temp.get(i));\n- }\n- }\n-}\n-\n-class Utils {\n-\n- public static int binarySearch(int[] a, int key) {\n- int s = 0;\n- int f = a.length;\n- while (f > s) {\n- int mid = (s + f) / 2;\n- if (a[mid] > key) {\n- f = mid - 1;\n- } else if (a[mid] <= key) {\n- s = mid + 1;\n- }\n- }\n- return -1;\n- }\n-\n- public static long gcd(long a, long b) {\n- return b != 0 ? gcd(b, a % b) : a;\n- }\n-\n- public static long lcm(long a, long b) {\n- return a / gcd(a, b) * b;\n- }\n-\n- static List prime(int number) {\n- List a = new ArrayList<>();\n- for (int i = 2; i * i <= number; i++) {\n- if (number % i == 0) {\n- a.add(i);\n- number /= i;\n- i = 1;\n- }\n- }\n- a.add(number);\n- return a;\n- }\n-}\n-\n-class Pair {\n- public T a;\n- public U b;\n-\n- public Pair(T a, U b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Pair pair = (Pair) o;\n-\n- if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n- return b != null ? b.equals(pair.b) : pair.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Vect {\n- public int a;\n- public int b;\n-\n- public Vect(int a, int b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Vect vect = (Vect) o;\n-\n- if (a != vect.a) return false;\n- return b == vect.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Tri {\n- public int a;\n- public int b;\n- public int c;\n-\n- public Tri(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Tri tri = (Tri) o;\n-\n- if (a != tri.a) return false;\n- return b == tri.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Triple {\n- public T a;\n- public U b;\n- public P c;\n-\n- public Triple(T a, U b, P c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Triple triple = (Triple) o;\n-\n- if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n- return b != null ? b.equals(triple.b) : triple.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Scanner {\n- BufferedReader in;\n- StringTokenizer tok;\n-\n- public Scanner(InputStream in) {\n- this.in = new BufferedReader(new InputStreamReader(in));\n- tok = new StringTokenizer(\"\");\n- }\n-\n- private String tryReadNextLine() {\n- try {\n- return in.readLine();\n- } catch (Exception e) {\n- throw new InputMismatchException();\n- }\n- }\n-\n- public String nextToken() {\n- while (!tok.hasMoreTokens()) {\n- tok = new StringTokenizer(next());\n- }\n- return tok.nextToken();\n- }\n-\n- public String next() {\n- String newLine = tryReadNextLine();\n- if (newLine == null) throw new InputMismatchException();\n- return newLine;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(nextToken());\n- }\n-}", "output": "FASTER 2.3295", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 5.0264, "pair_id": "java_12287_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedReader;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n import java.util.*;\n \n-public class CF831E_3 {\n- public static int index;\n-\n- public static void main(String[] args) throws Exception {\n- InputReader in = new InputReader(System.in);\n- PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n+public class Main {\n+\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ Scanner in = new Scanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ Task solver = new Task();\n+ solver.solve(in, out);\n+ out.close();\n+ }\n+}\n+\n+class Task {\n+\n+ public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n- int arr[] = new int[n + 1];\n- segTree seg = new segTree(n);\n- BIT bit = new BIT((int) 1e5 + 50);\n- for (int i = 1; i <= n; i++) {\n- arr[i] = in.nextInt();\n- seg.update(i, arr[i]);\n- bit.add(i);\n- }\n+ List a = new ArrayList<>(n);\n+\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ a.add(new Vect(x, i));\n+ }\n+ a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n+\n+ int val = a.get(0).a;\n+ int start = 0;\n+ int mid = -1;\n+ int pos = -1;\n+ for (int i = 0; i < n; i++) {\n+ Vect v = a.get(i);\n+ if (val == v.a) {\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n+ }\n+ }\n+ if (val != v.a) {\n+ if (mid == -1) {\n+ mid = i;\n+ }\n+ swap(a, start, mid, i);\n+ start = i;\n+ pos = a.get(i - 1).b;\n+ mid = -1;\n+ val = a.get(i).a;\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n+ }\n+ }\n+ }\n+ if (mid == -1) {\n+ mid = n;\n+ }\n+ swap(a, start, mid, n);\n \n long sum = 0;\n- int last = 0;\n- Node min = seg.query(1, n);\n- for (int i = 1; i <= n; i++) {\n- Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n- if (node2.n <= node1.n) min = node2;\n- else min = node1;\n-\n- if (min.idx > last) {\n- int h = 0, l = 0;\n- l = bit.low(last + 1);\n- h = bit.low(min.idx + 1);\n-\n- sum += (long) (h - l);\n- } else {\n- int h = 0, l = 0;\n- h = bit.high(last);\n- l = bit.low(min.idx + 1);\n-\n- sum += (long) (h + l);\n- }\n- bit.remove(min.idx);\n- last = min.idx;\n- seg.update(min.idx, (int) 2e9);\n- }\n-\n- pw.println(sum);\n-\n- pw.close();\n- }\n-\n- static class BIT {\n- public int bit[], n;\n-\n- public BIT(int nn) {\n- n = nn;\n- bit = new int[n + 1];\n- }\n-\n- int low(int x) {\n- return sum(x - 1);\n- }\n-\n- int high(int x) {\n- return sum(n) - sum(x);\n- }\n-\n- void add(int x) {\n- add(x, 1);\n- }\n-\n- void remove(int x) {\n- add(x, -1);\n- }\n-\n- void add(int index, int value) {\n- for (; index < bit.length; index = index + (index & -index)) {\n- bit[index] += value;\n- }\n- }\n-\n- int sum(int index) {\n- int sum = 0;\n- for (; index > 0; index = index - (index & -index)) {\n- sum += bit[index];\n- }\n- return sum;\n- }\n- }\n-\n- static class Node implements Comparable {\n- int n, idx;\n-\n- Node(int N, int i) {\n- n = N;\n- idx = i;\n- }\n-\n- public int compareTo(Node N) {\n- if (n != N.n) return n - N.n;\n- else return idx - N.idx;\n- }\n-\n- public String toString() {\n- return n + \" \" + idx;\n- }\n- }\n-\n- static class segTree {\n- public int n;\n- Node seg[];\n-\n- public segTree(int N) {\n- n = N;\n- seg = new Node[4 * (int) 1e5];\n- for (int i = 0; i < seg.length; i++) {\n- seg[i] = new Node(0, 0);\n- }\n- }\n-\n- public void update(int pos, int val) {\n- update(1, 1, n, pos, val);\n- }\n-\n- public Node query(int l, int r) {\n- if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n- return query(1, 1, n, l, r);\n- }\n-\n- public void update(int p, int s, int e, int pos, int val) {\n- if (s == pos && e == pos) {\n- seg[p].n = val;\n- seg[p].idx = pos;\n- return;\n- }\n- if (s > pos || e < pos || s > e || e < s) return;\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- update(l, s, m, pos, val);\n- update(r, m + 1, e, pos, val);\n-\n- if (seg[l].n <= seg[r].n) {\n- seg[p].n = seg[l].n;\n- seg[p].idx = seg[l].idx;\n- } else {\n- seg[p].n = seg[r].n;\n- seg[p].idx = seg[r].idx;\n- }\n- }\n-\n- public Node query(int p, int s, int e, int a, int b) {\n- if (s >= a && e <= b) {\n- return seg[p];\n- }\n- if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- Node q1 = query(l, s, m, a, b);\n- Node q2 = query(r, m + 1, e, a, b);\n-\n- if (q1.n <= q2.n) {\n- return q1;\n- } else {\n- return q2;\n- }\n- }\n- }\n-\n- static void debug(Object... obj) {\n- System.err.println(Arrays.deepToString(obj));\n- }\n-\n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream));\n- tokenizer = null;\n- }\n-\n- public String next() throws Exception {\n- while (tokenizer == null || !tokenizer.hasMoreTokens())\n- tokenizer = new StringTokenizer(reader.readLine());\n- return tokenizer.nextToken();\n- }\n-\n- public String nextLine() throws Exception {\n- String line = null;\n- tokenizer = null;\n- line = reader.readLine();\n- return line;\n- }\n-\n- public int nextInt() throws Exception {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws Exception {\n- return Double.parseDouble(next());\n- }\n-\n- public long nextLong() throws Exception {\n- return Long.parseLong(next());\n- }\n- }\n-}\n+ int t = n;\n+ int prev = -1;\n+ for (int i = 0; i < a.size(); i++) {\n+ int cur = a.get(i).b;\n+ if (cur < prev) {\n+ sum += t;\n+ t = n - i;\n+ }\n+ prev = cur;\n+ }\n+ sum += t;\n+ System.out.println(sum);\n+ }\n+\n+ public void swap(List v, int s, int mid, int f) {\n+ List temp = new ArrayList<>(mid - s);\n+ for (int i = s; i < mid; i++) {\n+ temp.add(v.get(i));\n+ }\n+ for (int i = mid; i < f; i++) {\n+ v.set(i - temp.size(), v.get(i));\n+ }\n+ for (int i = 0; i < temp.size(); i++) {\n+ v.set(f - temp.size() + i, temp.get(i));\n+ }\n+ }\n+}\n+\n+class Utils {\n+\n+ public static int binarySearch(int[] a, int key) {\n+ int s = 0;\n+ int f = a.length;\n+ while (f > s) {\n+ int mid = (s + f) / 2;\n+ if (a[mid] > key) {\n+ f = mid - 1;\n+ } else if (a[mid] <= key) {\n+ s = mid + 1;\n+ }\n+ }\n+ return -1;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ return b != 0 ? gcd(b, a % b) : a;\n+ }\n+\n+ public static long lcm(long a, long b) {\n+ return a / gcd(a, b) * b;\n+ }\n+\n+ static List prime(int number) {\n+ List a = new ArrayList<>();\n+ for (int i = 2; i * i <= number; i++) {\n+ if (number % i == 0) {\n+ a.add(i);\n+ number /= i;\n+ i = 1;\n+ }\n+ }\n+ a.add(number);\n+ return a;\n+ }\n+}\n+\n+class Pair {\n+ public T a;\n+ public U b;\n+\n+ public Pair(T a, U b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Pair pair = (Pair) o;\n+\n+ if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n+ return b != null ? b.equals(pair.b) : pair.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Vect {\n+ public int a;\n+ public int b;\n+\n+ public Vect(int a, int b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Vect vect = (Vect) o;\n+\n+ if (a != vect.a) return false;\n+ return b == vect.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Tri {\n+ public int a;\n+ public int b;\n+ public int c;\n+\n+ public Tri(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Tri tri = (Tri) o;\n+\n+ if (a != tri.a) return false;\n+ return b == tri.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Triple {\n+ public T a;\n+ public U b;\n+ public P c;\n+\n+ public Triple(T a, U b, P c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Triple triple = (Triple) o;\n+\n+ if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n+ return b != null ? b.equals(triple.b) : triple.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Scanner {\n+ BufferedReader in;\n+ StringTokenizer tok;\n+\n+ public Scanner(InputStream in) {\n+ this.in = new BufferedReader(new InputStreamReader(in));\n+ tok = new StringTokenizer(\"\");\n+ }\n+\n+ private String tryReadNextLine() {\n+ try {\n+ return in.readLine();\n+ } catch (Exception e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+\n+ public String nextToken() {\n+ while (!tok.hasMoreTokens()) {\n+ tok = new StringTokenizer(next());\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ public String next() {\n+ String newLine = tryReadNextLine();\n+ if (newLine == null) throw new InputMismatchException();\n+ return newLine;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(nextToken());\n+ }\n+}", "output": "SLOWER 2.3295", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 5.0264, "pair_id": "java_12287_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedInputStream;\n import java.util.*;\n \n-public class e {\n+public class Main {\n \n+ public static TreeMap> treeSetTreeMap = new TreeMap<>();\n+ public static int[] c = new int[100_000 + 5];\n public static int n;\n- public static ArrayList list;\n \n- public static void main(String[] args) throws Exception {\n-\n- BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n- n = Integer.parseInt(stdin.readLine());\n- StringTokenizer tok = new StringTokenizer(stdin.readLine());\n- list = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = Integer.parseInt(tok.nextToken());\n- list.add(new item(x, i));\n- }\n- Collections.sort(list);\n-\n- System.out.println(solve());\n+ public static int lowbit(int x) {\n+ return x & (-x);\n }\n \n- public static long solve() {\n-\n- int i = 0;\n-\n- while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n- i++;\n-\n- if (i == n) return n;\n-\n- while (i < n) {\n-\n- int j = i;\n- while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n-\n- if (j > i) {\n-\n- int lastpos = list.get(i - 1).index;\n-\n- int k = -1;\n- for (k = i; k <= j; k++) {\n- if (list.get(k).index > lastpos) {\n- break;\n- }\n- }\n-\n- if (k > i) {\n-\n- item[] tmp = new item[j - i + 1];\n- for (int z = i; z <= j; z++) {\n- int ind = k + z - i;\n- if (ind > j) ind -= (j - i + 1);\n- tmp[z - i] = list.get(ind);\n- }\n- for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n- }\n- }\n-\n- i = j + 1;\n- }\n-\n- int[] arr = new int[n];\n- for (i = 0; i < n; i++) {\n- arr[i] = list.get(i).index + 1;\n- }\n-\n- long res = 0;\n- bit mybit = new bit(n);\n-\n- for (i = 0; i < n; i++) {\n-\n- if (i == 0) {\n- res += arr[i];\n- } else {\n-\n- if (arr[i] > arr[i - 1]) {\n- int range = arr[i] - arr[i - 1];\n-\n- res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n- } else {\n- int range = arr[i - 1] - arr[i] - 1;\n- range = n - range;\n- long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n-\n- res += (range - used);\n- }\n- }\n-\n- mybit.add(arr[i], 1L);\n- }\n-\n- return res;\n- }\n-}\n-\n-class item implements Comparable {\n-\n- public int value;\n- public int index;\n-\n- public item(int v, int i) {\n- value = v;\n- index = i;\n- }\n-\n- public int compareTo(item other) {\n- if (this.value != other.value) return this.value - other.value;\n- return this.index - other.index;\n- }\n-}\n-\n-class bit {\n-\n- public long[] cumfreq;\n-\n- public bit(int n) {\n-\n- int size = 1;\n- while (size < n) size <<= 1;\n- n = size;\n-\n- cumfreq = new long[n + 1];\n- }\n-\n- public void add(int index, long value) {\n- while (index < cumfreq.length) {\n- cumfreq[index] += value;\n- index += Integer.lowestOneBit(index);\n- }\n- }\n-\n- public long sum(int index) {\n- long ans = 0;\n- while (index > 0) {\n- ans += cumfreq[index];\n- index -= (Integer.lowestOneBit(index));\n+ public static int query(int t) {\n+ int ans = 0;\n+ while (t > 0) {\n+ ans += c[t];\n+ t -= lowbit(t);\n }\n return ans;\n }\n \n- public long sum(int low, int high) {\n- return sum(high) - sum(low - 1);\n+ public static void update(int p, int value) {\n+ while (p <= n) {\n+ c[p] += value;\n+ p += lowbit(p);\n+ }\n }\n \n- public long all() {\n- return sum(cumfreq.length - 1);\n- }\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(new BufferedInputStream(System.in));\n+ n = sc.nextInt();\n+ TreeSet tt = new TreeSet<>();\n \n- public long atOrAbove(int index) {\n- long sub = 0;\n- if (index > 0) sub = sum(index - 1);\n- return all() - sub;\n+ for (int i = 0; i < n; i++) {\n+ int a = sc.nextInt();\n+ TreeSet treeSet = treeSetTreeMap.get(a);\n+ if (treeSet == null) {\n+ treeSet = new TreeSet<>();\n+ }\n+ treeSet.add(i + 1);\n+ tt.add(i + 1);\n+ treeSetTreeMap.put(a, treeSet);\n+ update(i + 1, 1);\n+ }\n+\n+ int tn = n;\n+ Integer pos = 1;\n+ long ans = 0;\n+\n+ Set key1 = treeSetTreeMap.keySet();\n+\n+ TreeSet key = new TreeSet<>(key1);\n+\n+ for (Integer node : key) {\n+\n+ TreeSet values = treeSetTreeMap.get(node);\n+ while (!values.isEmpty()) {\n+ int sum1 = query(pos);\n+ Integer j = values.ceiling(pos);\n+ if (j == null) {\n+ j = values.first();\n+ }\n+ values.remove(j);\n+ int sum2 = query(j);\n+ if (sum1 <= sum2) {\n+ ans += sum2 - sum1 + 1;\n+ } else {\n+ ans += tn + sum2 - sum1 + 1;\n+ }\n+ update(j, -1);\n+ tt.remove(j);\n+ tn -= 1;\n+ if (tn == 0) {\n+ break;\n+ }\n+ pos = tt.higher(j);\n+ if (pos == null) {\n+ pos = tt.first();\n+ }\n+ }\n+ }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 1.4339", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 2.7017, "pair_id": "java_12281_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n+public class e {\n \n- public static TreeMap> treeSetTreeMap = new TreeMap<>();\n- public static int[] c = new int[100_000 + 5];\n public static int n;\n+ public static ArrayList list;\n \n- public static int lowbit(int x) {\n- return x & (-x);\n+ public static void main(String[] args) throws Exception {\n+\n+ BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n+ n = Integer.parseInt(stdin.readLine());\n+ StringTokenizer tok = new StringTokenizer(stdin.readLine());\n+ list = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = Integer.parseInt(tok.nextToken());\n+ list.add(new item(x, i));\n+ }\n+ Collections.sort(list);\n+\n+ System.out.println(solve());\n }\n \n- public static int query(int t) {\n- int ans = 0;\n- while (t > 0) {\n- ans += c[t];\n- t -= lowbit(t);\n+ public static long solve() {\n+\n+ int i = 0;\n+\n+ while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n+ i++;\n+\n+ if (i == n) return n;\n+\n+ while (i < n) {\n+\n+ int j = i;\n+ while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n+\n+ if (j > i) {\n+\n+ int lastpos = list.get(i - 1).index;\n+\n+ int k = -1;\n+ for (k = i; k <= j; k++) {\n+ if (list.get(k).index > lastpos) {\n+ break;\n+ }\n+ }\n+\n+ if (k > i) {\n+\n+ item[] tmp = new item[j - i + 1];\n+ for (int z = i; z <= j; z++) {\n+ int ind = k + z - i;\n+ if (ind > j) ind -= (j - i + 1);\n+ tmp[z - i] = list.get(ind);\n+ }\n+ for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n+ }\n+ }\n+\n+ i = j + 1;\n+ }\n+\n+ int[] arr = new int[n];\n+ for (i = 0; i < n; i++) {\n+ arr[i] = list.get(i).index + 1;\n+ }\n+\n+ long res = 0;\n+ bit mybit = new bit(n);\n+\n+ for (i = 0; i < n; i++) {\n+\n+ if (i == 0) {\n+ res += arr[i];\n+ } else {\n+\n+ if (arr[i] > arr[i - 1]) {\n+ int range = arr[i] - arr[i - 1];\n+\n+ res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n+ } else {\n+ int range = arr[i - 1] - arr[i] - 1;\n+ range = n - range;\n+ long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n+\n+ res += (range - used);\n+ }\n+ }\n+\n+ mybit.add(arr[i], 1L);\n+ }\n+\n+ return res;\n+ }\n+}\n+\n+class item implements Comparable {\n+\n+ public int value;\n+ public int index;\n+\n+ public item(int v, int i) {\n+ value = v;\n+ index = i;\n+ }\n+\n+ public int compareTo(item other) {\n+ if (this.value != other.value) return this.value - other.value;\n+ return this.index - other.index;\n+ }\n+}\n+\n+class bit {\n+\n+ public long[] cumfreq;\n+\n+ public bit(int n) {\n+\n+ int size = 1;\n+ while (size < n) size <<= 1;\n+ n = size;\n+\n+ cumfreq = new long[n + 1];\n+ }\n+\n+ public void add(int index, long value) {\n+ while (index < cumfreq.length) {\n+ cumfreq[index] += value;\n+ index += Integer.lowestOneBit(index);\n+ }\n+ }\n+\n+ public long sum(int index) {\n+ long ans = 0;\n+ while (index > 0) {\n+ ans += cumfreq[index];\n+ index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n \n- public static void update(int p, int value) {\n- while (p <= n) {\n- c[p] += value;\n- p += lowbit(p);\n- }\n+ public long sum(int low, int high) {\n+ return sum(high) - sum(low - 1);\n }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(new BufferedInputStream(System.in));\n- n = sc.nextInt();\n- TreeSet tt = new TreeSet<>();\n+ public long all() {\n+ return sum(cumfreq.length - 1);\n+ }\n \n- for (int i = 0; i < n; i++) {\n- int a = sc.nextInt();\n- TreeSet treeSet = treeSetTreeMap.get(a);\n- if (treeSet == null) {\n- treeSet = new TreeSet<>();\n- }\n- treeSet.add(i + 1);\n- tt.add(i + 1);\n- treeSetTreeMap.put(a, treeSet);\n- update(i + 1, 1);\n- }\n-\n- int tn = n;\n- Integer pos = 1;\n- long ans = 0;\n-\n- Set key1 = treeSetTreeMap.keySet();\n-\n- TreeSet key = new TreeSet<>(key1);\n-\n- for (Integer node : key) {\n-\n- TreeSet values = treeSetTreeMap.get(node);\n- while (!values.isEmpty()) {\n- int sum1 = query(pos);\n- Integer j = values.ceiling(pos);\n- if (j == null) {\n- j = values.first();\n- }\n- values.remove(j);\n- int sum2 = query(j);\n- if (sum1 <= sum2) {\n- ans += sum2 - sum1 + 1;\n- } else {\n- ans += tn + sum2 - sum1 + 1;\n- }\n- update(j, -1);\n- tt.remove(j);\n- tn -= 1;\n- if (tn == 0) {\n- break;\n- }\n- pos = tt.higher(j);\n- if (pos == null) {\n- pos = tt.first();\n- }\n- }\n- }\n- System.out.println(ans);\n+ public long atOrAbove(int index) {\n+ long sub = 0;\n+ if (index > 0) sub = sum(index - 1);\n+ return all() - sub;\n }\n }", "output": "SLOWER 1.4339", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 2.7017, "pair_id": "java_12281_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Random;\n-import java.util.StringTokenizer;\n+import java.io.BufferedInputStream;\n+import java.util.*;\n \n public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n+\n+ public static TreeMap> treeSetTreeMap = new TreeMap<>();\n+ public static int[] c = new int[100_000 + 5];\n+ public static int n;\n+\n+ public static int lowbit(int x) {\n+ return x & (-x);\n }\n \n- static class TaskB {\n- Random random = new Random();\n+ public static int query(int t) {\n+ int ans = 0;\n+ while (t > 0) {\n+ ans += c[t];\n+ t -= lowbit(t);\n+ }\n+ return ans;\n+ }\n \n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int[] a = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- int k = repaint(a);\n- int[] nextSame = new int[n];\n- int[] nextLarger = new int[n];\n- int[] last = new int[k + 1];\n- Arrays.fill(last, -1);\n- for (int step = 0; step < 2 * n; step++) {\n- int i = -step % n;\n- if (i < 0) {\n- i += n;\n- }\n- nextSame[i] = last[a[i]];\n- nextLarger[i] = last[a[i] + 1];\n- last[a[i]] = i;\n- }\n-\n- int[] tree = new int[n];\n- for (int i = 0; i < n; i++) {\n- add(tree, i, 1);\n- }\n- int first = -1;\n- for (int i = 0; i < n; i++) {\n- if (a[i] == 0) {\n- first = i;\n- break;\n- }\n- }\n- long ans = 0;\n- int x = 0;\n- for (int i = 0; i < n; i++) {\n- int nx;\n- if (i == 0) {\n- nx = first;\n- } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n- nx = nextSame[x];\n- } else {\n- nx = nextLarger[x];\n- }\n- if (x <= nx) {\n- ans += sum(tree, x, nx);\n- } else {\n- ans += sum(tree, x, n - 1);\n- ans += sum(tree, 0, nx);\n- }\n- x = nx;\n- add(tree, x, -1);\n- }\n- out.println(ans);\n- }\n-\n- private void add(int[] tree, int pos, int val) {\n- while (pos < tree.length) {\n- tree[pos] += val;\n- pos |= pos + 1;\n- }\n- }\n-\n- private int sum(int[] tree, int l, int r) {\n- return sum(tree, r) - sum(tree, l - 1);\n- }\n-\n- private int sum(int[] tree, int r) {\n- int res = 0;\n- while (r >= 0) {\n- res += tree[r];\n- r = (r & (r + 1)) - 1;\n- }\n- return res;\n- }\n-\n- private int repaint(int[] a) {\n- int[] b = a.clone();\n- randomShuffle(b);\n- Arrays.sort(b);\n- int k = 0;\n- for (int i = 0; i < b.length; i++) {\n- if (i == 0 || b[i] != b[i - 1]) {\n- b[k++] = b[i];\n- }\n- }\n- for (int i = 0; i < a.length; i++) {\n- a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n- }\n- return k;\n- }\n-\n- private void randomShuffle(int[] a) {\n- for (int i = 0; i < a.length; i++) {\n- int j = random.nextInt(i + 1);\n- int t = a[i];\n- a[i] = a[j];\n- a[j] = t;\n- }\n+ public static void update(int p, int value) {\n+ while (p <= n) {\n+ c[p] += value;\n+ p += lowbit(p);\n }\n }\n \n- static class FastScanner {\n- private BufferedReader in;\n- private StringTokenizer st;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(new BufferedInputStream(System.in));\n+ n = sc.nextInt();\n+ TreeSet tt = new TreeSet<>();\n \n- public FastScanner(InputStream stream) {\n- in = new BufferedReader(new InputStreamReader(stream));\n+ for (int i = 0; i < n; i++) {\n+ int a = sc.nextInt();\n+ TreeSet treeSet = treeSetTreeMap.get(a);\n+ if (treeSet == null) {\n+ treeSet = new TreeSet<>();\n+ }\n+ treeSet.add(i + 1);\n+ tt.add(i + 1);\n+ treeSetTreeMap.put(a, treeSet);\n+ update(i + 1, 1);\n }\n \n- public String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- String rl = in.readLine();\n- if (rl == null) {\n- return null;\n- }\n- st = new StringTokenizer(rl);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n+ int tn = n;\n+ Integer pos = 1;\n+ long ans = 0;\n+\n+ Set key1 = treeSetTreeMap.keySet();\n+\n+ TreeSet key = new TreeSet<>(key1);\n+\n+ for (Integer node : key) {\n+\n+ TreeSet values = treeSetTreeMap.get(node);\n+ while (!values.isEmpty()) {\n+ int sum1 = query(pos);\n+ Integer j = values.ceiling(pos);\n+ if (j == null) {\n+ j = values.first();\n+ }\n+ values.remove(j);\n+ int sum2 = query(j);\n+ if (sum1 <= sum2) {\n+ ans += sum2 - sum1 + 1;\n+ } else {\n+ ans += tn + sum2 - sum1 + 1;\n+ }\n+ update(j, -1);\n+ tt.remove(j);\n+ tn -= 1;\n+ if (tn == 0) {\n+ break;\n+ }\n+ pos = tt.higher(j);\n+ if (pos == null) {\n+ pos = tt.first();\n }\n }\n- return st.nextToken();\n }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 2.7917", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 6.9246, "pair_id": "java_12282_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Random;\n+import java.util.StringTokenizer;\n \n public class Main {\n-\n- public static TreeMap> treeSetTreeMap = new TreeMap<>();\n- public static int[] c = new int[100_000 + 5];\n- public static int n;\n-\n- public static int lowbit(int x) {\n- return x & (-x);\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n }\n \n- public static int query(int t) {\n- int ans = 0;\n- while (t > 0) {\n- ans += c[t];\n- t -= lowbit(t);\n+ static class TaskB {\n+ Random random = new Random();\n+\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int[] a = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ int k = repaint(a);\n+ int[] nextSame = new int[n];\n+ int[] nextLarger = new int[n];\n+ int[] last = new int[k + 1];\n+ Arrays.fill(last, -1);\n+ for (int step = 0; step < 2 * n; step++) {\n+ int i = -step % n;\n+ if (i < 0) {\n+ i += n;\n+ }\n+ nextSame[i] = last[a[i]];\n+ nextLarger[i] = last[a[i] + 1];\n+ last[a[i]] = i;\n+ }\n+\n+ int[] tree = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ add(tree, i, 1);\n+ }\n+ int first = -1;\n+ for (int i = 0; i < n; i++) {\n+ if (a[i] == 0) {\n+ first = i;\n+ break;\n+ }\n+ }\n+ long ans = 0;\n+ int x = 0;\n+ for (int i = 0; i < n; i++) {\n+ int nx;\n+ if (i == 0) {\n+ nx = first;\n+ } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n+ nx = nextSame[x];\n+ } else {\n+ nx = nextLarger[x];\n+ }\n+ if (x <= nx) {\n+ ans += sum(tree, x, nx);\n+ } else {\n+ ans += sum(tree, x, n - 1);\n+ ans += sum(tree, 0, nx);\n+ }\n+ x = nx;\n+ add(tree, x, -1);\n+ }\n+ out.println(ans);\n }\n- return ans;\n- }\n \n- public static void update(int p, int value) {\n- while (p <= n) {\n- c[p] += value;\n- p += lowbit(p);\n+ private void add(int[] tree, int pos, int val) {\n+ while (pos < tree.length) {\n+ tree[pos] += val;\n+ pos |= pos + 1;\n+ }\n+ }\n+\n+ private int sum(int[] tree, int l, int r) {\n+ return sum(tree, r) - sum(tree, l - 1);\n+ }\n+\n+ private int sum(int[] tree, int r) {\n+ int res = 0;\n+ while (r >= 0) {\n+ res += tree[r];\n+ r = (r & (r + 1)) - 1;\n+ }\n+ return res;\n+ }\n+\n+ private int repaint(int[] a) {\n+ int[] b = a.clone();\n+ randomShuffle(b);\n+ Arrays.sort(b);\n+ int k = 0;\n+ for (int i = 0; i < b.length; i++) {\n+ if (i == 0 || b[i] != b[i - 1]) {\n+ b[k++] = b[i];\n+ }\n+ }\n+ for (int i = 0; i < a.length; i++) {\n+ a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n+ }\n+ return k;\n+ }\n+\n+ private void randomShuffle(int[] a) {\n+ for (int i = 0; i < a.length; i++) {\n+ int j = random.nextInt(i + 1);\n+ int t = a[i];\n+ a[i] = a[j];\n+ a[j] = t;\n+ }\n }\n }\n \n- public static void main(String[] args) {\n- Scanner sc = new Scanner(new BufferedInputStream(System.in));\n- n = sc.nextInt();\n- TreeSet tt = new TreeSet<>();\n+ static class FastScanner {\n+ private BufferedReader in;\n+ private StringTokenizer st;\n \n- for (int i = 0; i < n; i++) {\n- int a = sc.nextInt();\n- TreeSet treeSet = treeSetTreeMap.get(a);\n- if (treeSet == null) {\n- treeSet = new TreeSet<>();\n- }\n- treeSet.add(i + 1);\n- tt.add(i + 1);\n- treeSetTreeMap.put(a, treeSet);\n- update(i + 1, 1);\n+ public FastScanner(InputStream stream) {\n+ in = new BufferedReader(new InputStreamReader(stream));\n }\n \n- int tn = n;\n- Integer pos = 1;\n- long ans = 0;\n-\n- Set key1 = treeSetTreeMap.keySet();\n-\n- TreeSet key = new TreeSet<>(key1);\n-\n- for (Integer node : key) {\n-\n- TreeSet values = treeSetTreeMap.get(node);\n- while (!values.isEmpty()) {\n- int sum1 = query(pos);\n- Integer j = values.ceiling(pos);\n- if (j == null) {\n- j = values.first();\n- }\n- values.remove(j);\n- int sum2 = query(j);\n- if (sum1 <= sum2) {\n- ans += sum2 - sum1 + 1;\n- } else {\n- ans += tn + sum2 - sum1 + 1;\n- }\n- update(j, -1);\n- tt.remove(j);\n- tn -= 1;\n- if (tn == 0) {\n- break;\n- }\n- pos = tt.higher(j);\n- if (pos == null) {\n- pos = tt.first();\n+ public String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ String rl = in.readLine();\n+ if (rl == null) {\n+ return null;\n+ }\n+ st = new StringTokenizer(rl);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n }\n }\n+ return st.nextToken();\n }\n- System.out.println(ans);\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n }\n }", "output": "SLOWER 2.7917", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 6.9246, "pair_id": "java_12282_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.OutputStream;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Random;\n-import java.util.StringTokenizer;\n-\n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n- out.close();\n- }\n-\n- static class TaskB {\n- Random random = new Random();\n-\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int[] a = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- int k = repaint(a);\n- int[] nextSame = new int[n];\n- int[] nextLarger = new int[n];\n- int[] last = new int[k + 1];\n- Arrays.fill(last, -1);\n- for (int step = 0; step < 2 * n; step++) {\n- int i = -step % n;\n- if (i < 0) {\n- i += n;\n- }\n- nextSame[i] = last[a[i]];\n- nextLarger[i] = last[a[i] + 1];\n- last[a[i]] = i;\n- }\n-\n- int[] tree = new int[n];\n- for (int i = 0; i < n; i++) {\n- add(tree, i, 1);\n- }\n- int first = -1;\n- for (int i = 0; i < n; i++) {\n- if (a[i] == 0) {\n- first = i;\n- break;\n- }\n- }\n- long ans = 0;\n- int x = 0;\n- for (int i = 0; i < n; i++) {\n- int nx;\n- if (i == 0) {\n- nx = first;\n- } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n- nx = nextSame[x];\n- } else {\n- nx = nextLarger[x];\n- }\n- if (x <= nx) {\n- ans += sum(tree, x, nx);\n- } else {\n- ans += sum(tree, x, n - 1);\n- ans += sum(tree, 0, nx);\n- }\n- x = nx;\n- add(tree, x, -1);\n- }\n- out.println(ans);\n- }\n-\n- private void add(int[] tree, int pos, int val) {\n- while (pos < tree.length) {\n- tree[pos] += val;\n- pos |= pos + 1;\n- }\n- }\n-\n- private int sum(int[] tree, int l, int r) {\n- return sum(tree, r) - sum(tree, l - 1);\n- }\n-\n- private int sum(int[] tree, int r) {\n- int res = 0;\n- while (r >= 0) {\n- res += tree[r];\n- r = (r & (r + 1)) - 1;\n- }\n- return res;\n- }\n-\n- private int repaint(int[] a) {\n- int[] b = a.clone();\n- randomShuffle(b);\n- Arrays.sort(b);\n- int k = 0;\n- for (int i = 0; i < b.length; i++) {\n- if (i == 0 || b[i] != b[i - 1]) {\n- b[k++] = b[i];\n- }\n- }\n- for (int i = 0; i < a.length; i++) {\n- a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n- }\n- return k;\n- }\n-\n- private void randomShuffle(int[] a) {\n- for (int i = 0; i < a.length; i++) {\n- int j = random.nextInt(i + 1);\n- int t = a[i];\n- a[i] = a[j];\n- a[j] = t;\n- }\n- }\n- }\n-\n- static class FastScanner {\n- private BufferedReader in;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream stream) {\n- in = new BufferedReader(new InputStreamReader(stream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- String rl = in.readLine();\n- if (rl == null) {\n- return null;\n- }\n- st = new StringTokenizer(rl);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n+import java.io.*;\n+import java.util.*;\n+\n+public class CF831E_3 {\n+ public static int index;\n+\n+ public static void main(String[] args) throws Exception {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ int n = in.nextInt();\n+ int arr[] = new int[n + 1];\n+ segTree seg = new segTree(n);\n+ BIT bit = new BIT((int) 1e5 + 50);\n+ for (int i = 1; i <= n; i++) {\n+ arr[i] = in.nextInt();\n+ seg.update(i, arr[i]);\n+ bit.add(i);\n+ }\n+\n+ long sum = 0;\n+ int last = 0;\n+ Node min = seg.query(1, n);\n+ for (int i = 1; i <= n; i++) {\n+ Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n+ if (node2.n <= node1.n) min = node2;\n+ else min = node1;\n+\n+ if (min.idx > last) {\n+ int h = 0, l = 0;\n+ l = bit.low(last + 1);\n+ h = bit.low(min.idx + 1);\n+\n+ sum += (long) (h - l);\n+ } else {\n+ int h = 0, l = 0;\n+ h = bit.high(last);\n+ l = bit.low(min.idx + 1);\n+\n+ sum += (long) (h + l);\n+ }\n+ bit.remove(min.idx);\n+ last = min.idx;\n+ seg.update(min.idx, (int) 2e9);\n+ }\n+\n+ pw.println(sum);\n+\n+ pw.close();\n+ }\n+\n+ static class BIT {\n+ public int bit[], n;\n+\n+ public BIT(int nn) {\n+ n = nn;\n+ bit = new int[n + 1];\n+ }\n+\n+ int low(int x) {\n+ return sum(x - 1);\n+ }\n+\n+ int high(int x) {\n+ return sum(n) - sum(x);\n+ }\n+\n+ void add(int x) {\n+ add(x, 1);\n+ }\n+\n+ void remove(int x) {\n+ add(x, -1);\n+ }\n+\n+ void add(int index, int value) {\n+ for (; index < bit.length; index = index + (index & -index)) {\n+ bit[index] += value;\n+ }\n+ }\n+\n+ int sum(int index) {\n+ int sum = 0;\n+ for (; index > 0; index = index - (index & -index)) {\n+ sum += bit[index];\n+ }\n+ return sum;\n+ }\n+ }\n+\n+ static class Node implements Comparable {\n+ int n, idx;\n+\n+ Node(int N, int i) {\n+ n = N;\n+ idx = i;\n+ }\n+\n+ public int compareTo(Node N) {\n+ if (n != N.n) return n - N.n;\n+ else return idx - N.idx;\n+ }\n+\n+ public String toString() {\n+ return n + \" \" + idx;\n+ }\n+ }\n+\n+ static class segTree {\n+ public int n;\n+ Node seg[];\n+\n+ public segTree(int N) {\n+ n = N;\n+ seg = new Node[4 * (int) 1e5];\n+ for (int i = 0; i < seg.length; i++) {\n+ seg[i] = new Node(0, 0);\n+ }\n+ }\n+\n+ public void update(int pos, int val) {\n+ update(1, 1, n, pos, val);\n+ }\n+\n+ public Node query(int l, int r) {\n+ if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n+ return query(1, 1, n, l, r);\n+ }\n+\n+ public void update(int p, int s, int e, int pos, int val) {\n+ if (s == pos && e == pos) {\n+ seg[p].n = val;\n+ seg[p].idx = pos;\n+ return;\n+ }\n+ if (s > pos || e < pos || s > e || e < s) return;\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ update(l, s, m, pos, val);\n+ update(r, m + 1, e, pos, val);\n+\n+ if (seg[l].n <= seg[r].n) {\n+ seg[p].n = seg[l].n;\n+ seg[p].idx = seg[l].idx;\n+ } else {\n+ seg[p].n = seg[r].n;\n+ seg[p].idx = seg[r].idx;\n+ }\n+ }\n+\n+ public Node query(int p, int s, int e, int a, int b) {\n+ if (s >= a && e <= b) {\n+ return seg[p];\n+ }\n+ if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ Node q1 = query(l, s, m, a, b);\n+ Node q2 = query(r, m + 1, e, a, b);\n+\n+ if (q1.n <= q2.n) {\n+ return q1;\n+ } else {\n+ return q2;\n+ }\n+ }\n+ }\n+\n+ static void debug(Object... obj) {\n+ System.err.println(Arrays.deepToString(obj));\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream));\n+ tokenizer = null;\n+ }\n+\n+ public String next() throws Exception {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens())\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ return tokenizer.nextToken();\n+ }\n+\n+ public String nextLine() throws Exception {\n+ String line = null;\n+ tokenizer = null;\n+ line = reader.readLine();\n+ return line;\n+ }\n+\n+ public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n+\n+ public double nextDouble() throws Exception {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public long nextLong() throws Exception {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "FASTER 2.1717", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 4.5054, "pair_id": "java_12286_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.OutputStream;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.Random;\n+import java.util.StringTokenizer;\n \n-public class CF831E_3 {\n- public static int index;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- public static void main(String[] args) throws Exception {\n- InputReader in = new InputReader(System.in);\n- PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n- int n = in.nextInt();\n- int arr[] = new int[n + 1];\n- segTree seg = new segTree(n);\n- BIT bit = new BIT((int) 1e5 + 50);\n- for (int i = 1; i <= n; i++) {\n- arr[i] = in.nextInt();\n- seg.update(i, arr[i]);\n- bit.add(i);\n+ static class TaskB {\n+ Random random = new Random();\n+\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int[] a = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ int k = repaint(a);\n+ int[] nextSame = new int[n];\n+ int[] nextLarger = new int[n];\n+ int[] last = new int[k + 1];\n+ Arrays.fill(last, -1);\n+ for (int step = 0; step < 2 * n; step++) {\n+ int i = -step % n;\n+ if (i < 0) {\n+ i += n;\n+ }\n+ nextSame[i] = last[a[i]];\n+ nextLarger[i] = last[a[i] + 1];\n+ last[a[i]] = i;\n+ }\n+\n+ int[] tree = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ add(tree, i, 1);\n+ }\n+ int first = -1;\n+ for (int i = 0; i < n; i++) {\n+ if (a[i] == 0) {\n+ first = i;\n+ break;\n+ }\n+ }\n+ long ans = 0;\n+ int x = 0;\n+ for (int i = 0; i < n; i++) {\n+ int nx;\n+ if (i == 0) {\n+ nx = first;\n+ } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n+ nx = nextSame[x];\n+ } else {\n+ nx = nextLarger[x];\n+ }\n+ if (x <= nx) {\n+ ans += sum(tree, x, nx);\n+ } else {\n+ ans += sum(tree, x, n - 1);\n+ ans += sum(tree, 0, nx);\n+ }\n+ x = nx;\n+ add(tree, x, -1);\n+ }\n+ out.println(ans);\n }\n \n- long sum = 0;\n- int last = 0;\n- Node min = seg.query(1, n);\n- for (int i = 1; i <= n; i++) {\n- Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n- if (node2.n <= node1.n) min = node2;\n- else min = node1;\n-\n- if (min.idx > last) {\n- int h = 0, l = 0;\n- l = bit.low(last + 1);\n- h = bit.low(min.idx + 1);\n-\n- sum += (long) (h - l);\n- } else {\n- int h = 0, l = 0;\n- h = bit.high(last);\n- l = bit.low(min.idx + 1);\n-\n- sum += (long) (h + l);\n- }\n- bit.remove(min.idx);\n- last = min.idx;\n- seg.update(min.idx, (int) 2e9);\n- }\n-\n- pw.println(sum);\n-\n- pw.close();\n- }\n-\n- static class BIT {\n- public int bit[], n;\n-\n- public BIT(int nn) {\n- n = nn;\n- bit = new int[n + 1];\n- }\n-\n- int low(int x) {\n- return sum(x - 1);\n- }\n-\n- int high(int x) {\n- return sum(n) - sum(x);\n- }\n-\n- void add(int x) {\n- add(x, 1);\n- }\n-\n- void remove(int x) {\n- add(x, -1);\n- }\n-\n- void add(int index, int value) {\n- for (; index < bit.length; index = index + (index & -index)) {\n- bit[index] += value;\n+ private void add(int[] tree, int pos, int val) {\n+ while (pos < tree.length) {\n+ tree[pos] += val;\n+ pos |= pos + 1;\n }\n }\n \n- int sum(int index) {\n- int sum = 0;\n- for (; index > 0; index = index - (index & -index)) {\n- sum += bit[index];\n- }\n- return sum;\n- }\n- }\n-\n- static class Node implements Comparable {\n- int n, idx;\n-\n- Node(int N, int i) {\n- n = N;\n- idx = i;\n+ private int sum(int[] tree, int l, int r) {\n+ return sum(tree, r) - sum(tree, l - 1);\n }\n \n- public int compareTo(Node N) {\n- if (n != N.n) return n - N.n;\n- else return idx - N.idx;\n+ private int sum(int[] tree, int r) {\n+ int res = 0;\n+ while (r >= 0) {\n+ res += tree[r];\n+ r = (r & (r + 1)) - 1;\n+ }\n+ return res;\n }\n \n- public String toString() {\n- return n + \" \" + idx;\n- }\n- }\n-\n- static class segTree {\n- public int n;\n- Node seg[];\n-\n- public segTree(int N) {\n- n = N;\n- seg = new Node[4 * (int) 1e5];\n- for (int i = 0; i < seg.length; i++) {\n- seg[i] = new Node(0, 0);\n+ private int repaint(int[] a) {\n+ int[] b = a.clone();\n+ randomShuffle(b);\n+ Arrays.sort(b);\n+ int k = 0;\n+ for (int i = 0; i < b.length; i++) {\n+ if (i == 0 || b[i] != b[i - 1]) {\n+ b[k++] = b[i];\n+ }\n }\n+ for (int i = 0; i < a.length; i++) {\n+ a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n+ }\n+ return k;\n }\n \n- public void update(int pos, int val) {\n- update(1, 1, n, pos, val);\n- }\n-\n- public Node query(int l, int r) {\n- if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n- return query(1, 1, n, l, r);\n- }\n-\n- public void update(int p, int s, int e, int pos, int val) {\n- if (s == pos && e == pos) {\n- seg[p].n = val;\n- seg[p].idx = pos;\n- return;\n- }\n- if (s > pos || e < pos || s > e || e < s) return;\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- update(l, s, m, pos, val);\n- update(r, m + 1, e, pos, val);\n-\n- if (seg[l].n <= seg[r].n) {\n- seg[p].n = seg[l].n;\n- seg[p].idx = seg[l].idx;\n- } else {\n- seg[p].n = seg[r].n;\n- seg[p].idx = seg[r].idx;\n- }\n- }\n-\n- public Node query(int p, int s, int e, int a, int b) {\n- if (s >= a && e <= b) {\n- return seg[p];\n- }\n- if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- Node q1 = query(l, s, m, a, b);\n- Node q2 = query(r, m + 1, e, a, b);\n-\n- if (q1.n <= q2.n) {\n- return q1;\n- } else {\n- return q2;\n+ private void randomShuffle(int[] a) {\n+ for (int i = 0; i < a.length; i++) {\n+ int j = random.nextInt(i + 1);\n+ int t = a[i];\n+ a[i] = a[j];\n+ a[j] = t;\n }\n }\n }\n \n- static void debug(Object... obj) {\n- System.err.println(Arrays.deepToString(obj));\n- }\n+ static class FastScanner {\n+ private BufferedReader in;\n+ private StringTokenizer st;\n \n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream));\n- tokenizer = null;\n+ public FastScanner(InputStream stream) {\n+ in = new BufferedReader(new InputStreamReader(stream));\n }\n \n- public String next() throws Exception {\n- while (tokenizer == null || !tokenizer.hasMoreTokens())\n- tokenizer = new StringTokenizer(reader.readLine());\n- return tokenizer.nextToken();\n+ public String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ String rl = in.readLine();\n+ if (rl == null) {\n+ return null;\n+ }\n+ st = new StringTokenizer(rl);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return st.nextToken();\n }\n \n- public String nextLine() throws Exception {\n- String line = null;\n- tokenizer = null;\n- line = reader.readLine();\n- return line;\n- }\n-\n- public int nextInt() throws Exception {\n+ public int nextInt() {\n return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws Exception {\n- return Double.parseDouble(next());\n- }\n-\n- public long nextLong() throws Exception {\n- return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 2.1717", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 4.5054, "pair_id": "java_12286_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.io.BufferedInputStream;\n import java.util.*;\n \n-public class CF831E_3 {\n- public static int index;\n+public class Main {\n \n- public static void main(String[] args) throws Exception {\n- InputReader in = new InputReader(System.in);\n- PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n- int n = in.nextInt();\n- int arr[] = new int[n + 1];\n- segTree seg = new segTree(n);\n- BIT bit = new BIT((int) 1e5 + 50);\n- for (int i = 1; i <= n; i++) {\n- arr[i] = in.nextInt();\n- seg.update(i, arr[i]);\n- bit.add(i);\n- }\n+ public static TreeMap> treeSetTreeMap = new TreeMap<>();\n+ public static int[] c = new int[100_000 + 5];\n+ public static int n;\n \n- long sum = 0;\n- int last = 0;\n- Node min = seg.query(1, n);\n- for (int i = 1; i <= n; i++) {\n- Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n- if (node2.n <= node1.n) min = node2;\n- else min = node1;\n-\n- if (min.idx > last) {\n- int h = 0, l = 0;\n- l = bit.low(last + 1);\n- h = bit.low(min.idx + 1);\n-\n- sum += (long) (h - l);\n- } else {\n- int h = 0, l = 0;\n- h = bit.high(last);\n- l = bit.low(min.idx + 1);\n-\n- sum += (long) (h + l);\n- }\n- bit.remove(min.idx);\n- last = min.idx;\n- seg.update(min.idx, (int) 2e9);\n- }\n-\n- pw.println(sum);\n-\n- pw.close();\n+ public static int lowbit(int x) {\n+ return x & (-x);\n }\n \n- static class BIT {\n- public int bit[], n;\n+ public static int query(int t) {\n+ int ans = 0;\n+ while (t > 0) {\n+ ans += c[t];\n+ t -= lowbit(t);\n+ }\n+ return ans;\n+ }\n \n- public BIT(int nn) {\n- n = nn;\n- bit = new int[n + 1];\n- }\n-\n- int low(int x) {\n- return sum(x - 1);\n- }\n-\n- int high(int x) {\n- return sum(n) - sum(x);\n- }\n-\n- void add(int x) {\n- add(x, 1);\n- }\n-\n- void remove(int x) {\n- add(x, -1);\n- }\n-\n- void add(int index, int value) {\n- for (; index < bit.length; index = index + (index & -index)) {\n- bit[index] += value;\n- }\n- }\n-\n- int sum(int index) {\n- int sum = 0;\n- for (; index > 0; index = index - (index & -index)) {\n- sum += bit[index];\n- }\n- return sum;\n+ public static void update(int p, int value) {\n+ while (p <= n) {\n+ c[p] += value;\n+ p += lowbit(p);\n }\n }\n \n- static class Node implements Comparable {\n- int n, idx;\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(new BufferedInputStream(System.in));\n+ n = sc.nextInt();\n+ TreeSet tt = new TreeSet<>();\n \n- Node(int N, int i) {\n- n = N;\n- idx = i;\n+ for (int i = 0; i < n; i++) {\n+ int a = sc.nextInt();\n+ TreeSet treeSet = treeSetTreeMap.get(a);\n+ if (treeSet == null) {\n+ treeSet = new TreeSet<>();\n+ }\n+ treeSet.add(i + 1);\n+ tt.add(i + 1);\n+ treeSetTreeMap.put(a, treeSet);\n+ update(i + 1, 1);\n }\n \n- public int compareTo(Node N) {\n- if (n != N.n) return n - N.n;\n- else return idx - N.idx;\n- }\n+ int tn = n;\n+ Integer pos = 1;\n+ long ans = 0;\n \n- public String toString() {\n- return n + \" \" + idx;\n- }\n- }\n+ Set key1 = treeSetTreeMap.keySet();\n \n- static class segTree {\n- public int n;\n- Node seg[];\n+ TreeSet key = new TreeSet<>(key1);\n \n- public segTree(int N) {\n- n = N;\n- seg = new Node[4 * (int) 1e5];\n- for (int i = 0; i < seg.length; i++) {\n- seg[i] = new Node(0, 0);\n+ for (Integer node : key) {\n+\n+ TreeSet values = treeSetTreeMap.get(node);\n+ while (!values.isEmpty()) {\n+ int sum1 = query(pos);\n+ Integer j = values.ceiling(pos);\n+ if (j == null) {\n+ j = values.first();\n+ }\n+ values.remove(j);\n+ int sum2 = query(j);\n+ if (sum1 <= sum2) {\n+ ans += sum2 - sum1 + 1;\n+ } else {\n+ ans += tn + sum2 - sum1 + 1;\n+ }\n+ update(j, -1);\n+ tt.remove(j);\n+ tn -= 1;\n+ if (tn == 0) {\n+ break;\n+ }\n+ pos = tt.higher(j);\n+ if (pos == null) {\n+ pos = tt.first();\n+ }\n }\n }\n-\n- public void update(int pos, int val) {\n- update(1, 1, n, pos, val);\n- }\n-\n- public Node query(int l, int r) {\n- if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n- return query(1, 1, n, l, r);\n- }\n-\n- public void update(int p, int s, int e, int pos, int val) {\n- if (s == pos && e == pos) {\n- seg[p].n = val;\n- seg[p].idx = pos;\n- return;\n- }\n- if (s > pos || e < pos || s > e || e < s) return;\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- update(l, s, m, pos, val);\n- update(r, m + 1, e, pos, val);\n-\n- if (seg[l].n <= seg[r].n) {\n- seg[p].n = seg[l].n;\n- seg[p].idx = seg[l].idx;\n- } else {\n- seg[p].n = seg[r].n;\n- seg[p].idx = seg[r].idx;\n- }\n- }\n-\n- public Node query(int p, int s, int e, int a, int b) {\n- if (s >= a && e <= b) {\n- return seg[p];\n- }\n- if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- Node q1 = query(l, s, m, a, b);\n- Node q2 = query(r, m + 1, e, a, b);\n-\n- if (q1.n <= q2.n) {\n- return q1;\n- } else {\n- return q2;\n- }\n- }\n- }\n-\n- static void debug(Object... obj) {\n- System.err.println(Arrays.deepToString(obj));\n- }\n-\n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream));\n- tokenizer = null;\n- }\n-\n- public String next() throws Exception {\n- while (tokenizer == null || !tokenizer.hasMoreTokens())\n- tokenizer = new StringTokenizer(reader.readLine());\n- return tokenizer.nextToken();\n- }\n-\n- public String nextLine() throws Exception {\n- String line = null;\n- tokenizer = null;\n- line = reader.readLine();\n- return line;\n- }\n-\n- public int nextInt() throws Exception {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws Exception {\n- return Double.parseDouble(next());\n- }\n-\n- public long nextLong() throws Exception {\n- return Long.parseLong(next());\n- }\n+ System.out.println(ans);\n }\n }", "output": "FASTER 0.6201", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 1.537, "pair_id": "java_12280_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedInputStream;\nimport java.util.*;\n\npublic class Main {\n\n public static TreeMap> treeSetTreeMap = new TreeMap<>();\n public static int[] c = new int[100_000 + 5];\n public static int n;\n\n public static int lowbit(int x) {\n return x & (-x);\n }\n\n public static int query(int t) {\n int ans = 0;\n while (t > 0) {\n ans += c[t];\n t -= lowbit(t);\n }\n return ans;\n }\n\n public static void update(int p, int value) {\n while (p <= n) {\n c[p] += value;\n p += lowbit(p);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(new BufferedInputStream(System.in));\n n = sc.nextInt();\n TreeSet tt = new TreeSet<>();\n\n for (int i = 0; i < n; i++) {\n int a = sc.nextInt();\n TreeSet treeSet = treeSetTreeMap.get(a);\n if (treeSet == null) {\n treeSet = new TreeSet<>();\n }\n treeSet.add(i + 1);\n tt.add(i + 1);\n treeSetTreeMap.put(a, treeSet);\n update(i + 1, 1);\n }\n\n int tn = n;\n Integer pos = 1;\n long ans = 0;\n\n Set key1 = treeSetTreeMap.keySet();\n\n TreeSet key = new TreeSet<>(key1);\n\n for (Integer node : key) {\n\n TreeSet values = treeSetTreeMap.get(node);\n while (!values.isEmpty()) {\n int sum1 = query(pos);\n Integer j = values.ceiling(pos);\n if (j == null) {\n j = values.first();\n }\n values.remove(j);\n int sum2 = query(j);\n if (sum1 <= sum2) {\n ans += sum2 - sum1 + 1;\n } else {\n ans += tn + sum2 - sum1 + 1;\n }\n update(j, -1);\n tt.remove(j);\n tn -= 1;\n if (tn == 0) {\n break;\n }\n pos = tt.higher(j);\n if (pos == null) {\n pos = tt.first();\n }\n }\n }\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedInputStream;\n+import java.io.*;\n import java.util.*;\n \n-public class Main {\n-\n- public static TreeMap> treeSetTreeMap = new TreeMap<>();\n- public static int[] c = new int[100_000 + 5];\n- public static int n;\n-\n- public static int lowbit(int x) {\n- return x & (-x);\n- }\n-\n- public static int query(int t) {\n- int ans = 0;\n- while (t > 0) {\n- ans += c[t];\n- t -= lowbit(t);\n- }\n- return ans;\n- }\n-\n- public static void update(int p, int value) {\n- while (p <= n) {\n- c[p] += value;\n- p += lowbit(p);\n- }\n- }\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(new BufferedInputStream(System.in));\n- n = sc.nextInt();\n- TreeSet tt = new TreeSet<>();\n-\n- for (int i = 0; i < n; i++) {\n- int a = sc.nextInt();\n- TreeSet treeSet = treeSetTreeMap.get(a);\n- if (treeSet == null) {\n- treeSet = new TreeSet<>();\n- }\n- treeSet.add(i + 1);\n- tt.add(i + 1);\n- treeSetTreeMap.put(a, treeSet);\n- update(i + 1, 1);\n- }\n-\n- int tn = n;\n- Integer pos = 1;\n- long ans = 0;\n-\n- Set key1 = treeSetTreeMap.keySet();\n-\n- TreeSet key = new TreeSet<>(key1);\n-\n- for (Integer node : key) {\n-\n- TreeSet values = treeSetTreeMap.get(node);\n- while (!values.isEmpty()) {\n- int sum1 = query(pos);\n- Integer j = values.ceiling(pos);\n- if (j == null) {\n- j = values.first();\n- }\n- values.remove(j);\n- int sum2 = query(j);\n- if (sum1 <= sum2) {\n- ans += sum2 - sum1 + 1;\n- } else {\n- ans += tn + sum2 - sum1 + 1;\n- }\n- update(j, -1);\n- tt.remove(j);\n- tn -= 1;\n- if (tn == 0) {\n- break;\n- }\n- pos = tt.higher(j);\n- if (pos == null) {\n- pos = tt.first();\n- }\n- }\n- }\n- System.out.println(ans);\n+public class CF831E_3 {\n+ public static int index;\n+\n+ public static void main(String[] args) throws Exception {\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ int n = in.nextInt();\n+ int arr[] = new int[n + 1];\n+ segTree seg = new segTree(n);\n+ BIT bit = new BIT((int) 1e5 + 50);\n+ for (int i = 1; i <= n; i++) {\n+ arr[i] = in.nextInt();\n+ seg.update(i, arr[i]);\n+ bit.add(i);\n+ }\n+\n+ long sum = 0;\n+ int last = 0;\n+ Node min = seg.query(1, n);\n+ for (int i = 1; i <= n; i++) {\n+ Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n+ if (node2.n <= node1.n) min = node2;\n+ else min = node1;\n+\n+ if (min.idx > last) {\n+ int h = 0, l = 0;\n+ l = bit.low(last + 1);\n+ h = bit.low(min.idx + 1);\n+\n+ sum += (long) (h - l);\n+ } else {\n+ int h = 0, l = 0;\n+ h = bit.high(last);\n+ l = bit.low(min.idx + 1);\n+\n+ sum += (long) (h + l);\n+ }\n+ bit.remove(min.idx);\n+ last = min.idx;\n+ seg.update(min.idx, (int) 2e9);\n+ }\n+\n+ pw.println(sum);\n+\n+ pw.close();\n+ }\n+\n+ static class BIT {\n+ public int bit[], n;\n+\n+ public BIT(int nn) {\n+ n = nn;\n+ bit = new int[n + 1];\n+ }\n+\n+ int low(int x) {\n+ return sum(x - 1);\n+ }\n+\n+ int high(int x) {\n+ return sum(n) - sum(x);\n+ }\n+\n+ void add(int x) {\n+ add(x, 1);\n+ }\n+\n+ void remove(int x) {\n+ add(x, -1);\n+ }\n+\n+ void add(int index, int value) {\n+ for (; index < bit.length; index = index + (index & -index)) {\n+ bit[index] += value;\n+ }\n+ }\n+\n+ int sum(int index) {\n+ int sum = 0;\n+ for (; index > 0; index = index - (index & -index)) {\n+ sum += bit[index];\n+ }\n+ return sum;\n+ }\n+ }\n+\n+ static class Node implements Comparable {\n+ int n, idx;\n+\n+ Node(int N, int i) {\n+ n = N;\n+ idx = i;\n+ }\n+\n+ public int compareTo(Node N) {\n+ if (n != N.n) return n - N.n;\n+ else return idx - N.idx;\n+ }\n+\n+ public String toString() {\n+ return n + \" \" + idx;\n+ }\n+ }\n+\n+ static class segTree {\n+ public int n;\n+ Node seg[];\n+\n+ public segTree(int N) {\n+ n = N;\n+ seg = new Node[4 * (int) 1e5];\n+ for (int i = 0; i < seg.length; i++) {\n+ seg[i] = new Node(0, 0);\n+ }\n+ }\n+\n+ public void update(int pos, int val) {\n+ update(1, 1, n, pos, val);\n+ }\n+\n+ public Node query(int l, int r) {\n+ if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n+ return query(1, 1, n, l, r);\n+ }\n+\n+ public void update(int p, int s, int e, int pos, int val) {\n+ if (s == pos && e == pos) {\n+ seg[p].n = val;\n+ seg[p].idx = pos;\n+ return;\n+ }\n+ if (s > pos || e < pos || s > e || e < s) return;\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ update(l, s, m, pos, val);\n+ update(r, m + 1, e, pos, val);\n+\n+ if (seg[l].n <= seg[r].n) {\n+ seg[p].n = seg[l].n;\n+ seg[p].idx = seg[l].idx;\n+ } else {\n+ seg[p].n = seg[r].n;\n+ seg[p].idx = seg[r].idx;\n+ }\n+ }\n+\n+ public Node query(int p, int s, int e, int a, int b) {\n+ if (s >= a && e <= b) {\n+ return seg[p];\n+ }\n+ if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ Node q1 = query(l, s, m, a, b);\n+ Node q2 = query(r, m + 1, e, a, b);\n+\n+ if (q1.n <= q2.n) {\n+ return q1;\n+ } else {\n+ return q2;\n+ }\n+ }\n+ }\n+\n+ static void debug(Object... obj) {\n+ System.err.println(Arrays.deepToString(obj));\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream));\n+ tokenizer = null;\n+ }\n+\n+ public String next() throws Exception {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens())\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ return tokenizer.nextToken();\n+ }\n+\n+ public String nextLine() throws Exception {\n+ String line = null;\n+ tokenizer = null;\n+ line = reader.readLine();\n+ return line;\n+ }\n+\n+ public int nextInt() throws Exception {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() throws Exception {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public long nextLong() throws Exception {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "SLOWER 0.6201", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 1.537, "pair_id": "java_12280_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class e {\n-\n- public static int n;\n- public static ArrayList list;\n+public class CF831E_3 {\n+ public static int index;\n \n public static void main(String[] args) throws Exception {\n-\n- BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n- n = Integer.parseInt(stdin.readLine());\n- StringTokenizer tok = new StringTokenizer(stdin.readLine());\n- list = new ArrayList();\n- for (int i = 0; i < n; i++) {\n- int x = Integer.parseInt(tok.nextToken());\n- list.add(new item(x, i));\n- }\n- Collections.sort(list);\n-\n- System.out.println(solve());\n- }\n-\n- public static long solve() {\n-\n- int i = 0;\n-\n- while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n- i++;\n-\n- if (i == n) return n;\n-\n- while (i < n) {\n-\n- int j = i;\n- while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n-\n- if (j > i) {\n-\n- int lastpos = list.get(i - 1).index;\n-\n- int k = -1;\n- for (k = i; k <= j; k++) {\n- if (list.get(k).index > lastpos) {\n- break;\n- }\n- }\n-\n- if (k > i) {\n-\n- item[] tmp = new item[j - i + 1];\n- for (int z = i; z <= j; z++) {\n- int ind = k + z - i;\n- if (ind > j) ind -= (j - i + 1);\n- tmp[z - i] = list.get(ind);\n- }\n- for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n- }\n- }\n-\n- i = j + 1;\n- }\n-\n- int[] arr = new int[n];\n- for (i = 0; i < n; i++) {\n- arr[i] = list.get(i).index + 1;\n- }\n-\n- long res = 0;\n- bit mybit = new bit(n);\n-\n- for (i = 0; i < n; i++) {\n-\n- if (i == 0) {\n- res += arr[i];\n+ InputReader in = new InputReader(System.in);\n+ PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n+ int n = in.nextInt();\n+ int arr[] = new int[n + 1];\n+ segTree seg = new segTree(n);\n+ BIT bit = new BIT((int) 1e5 + 50);\n+ for (int i = 1; i <= n; i++) {\n+ arr[i] = in.nextInt();\n+ seg.update(i, arr[i]);\n+ bit.add(i);\n+ }\n+\n+ long sum = 0;\n+ int last = 0;\n+ Node min = seg.query(1, n);\n+ for (int i = 1; i <= n; i++) {\n+ Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n+ if (node2.n <= node1.n) min = node2;\n+ else min = node1;\n+\n+ if (min.idx > last) {\n+ int h = 0, l = 0;\n+ l = bit.low(last + 1);\n+ h = bit.low(min.idx + 1);\n+\n+ sum += (long) (h - l);\n } else {\n-\n- if (arr[i] > arr[i - 1]) {\n- int range = arr[i] - arr[i - 1];\n-\n- res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n- } else {\n- int range = arr[i - 1] - arr[i] - 1;\n- range = n - range;\n- long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n-\n- res += (range - used);\n- }\n- }\n-\n- mybit.add(arr[i], 1L);\n- }\n-\n- return res;\n+ int h = 0, l = 0;\n+ h = bit.high(last);\n+ l = bit.low(min.idx + 1);\n+\n+ sum += (long) (h + l);\n+ }\n+ bit.remove(min.idx);\n+ last = min.idx;\n+ seg.update(min.idx, (int) 2e9);\n+ }\n+\n+ pw.println(sum);\n+\n+ pw.close();\n+ }\n+\n+ static class BIT {\n+ public int bit[], n;\n+\n+ public BIT(int nn) {\n+ n = nn;\n+ bit = new int[n + 1];\n+ }\n+\n+ int low(int x) {\n+ return sum(x - 1);\n+ }\n+\n+ int high(int x) {\n+ return sum(n) - sum(x);\n+ }\n+\n+ void add(int x) {\n+ add(x, 1);\n+ }\n+\n+ void remove(int x) {\n+ add(x, -1);\n+ }\n+\n+ void add(int index, int value) {\n+ for (; index < bit.length; index = index + (index & -index)) {\n+ bit[index] += value;\n+ }\n+ }\n+\n+ int sum(int index) {\n+ int sum = 0;\n+ for (; index > 0; index = index - (index & -index)) {\n+ sum += bit[index];\n+ }\n+ return sum;\n+ }\n+ }\n+\n+ static class Node implements Comparable {\n+ int n, idx;\n+\n+ Node(int N, int i) {\n+ n = N;\n+ idx = i;\n+ }\n+\n+ public int compareTo(Node N) {\n+ if (n != N.n) return n - N.n;\n+ else return idx - N.idx;\n+ }\n+\n+ public String toString() {\n+ return n + \" \" + idx;\n+ }\n+ }\n+\n+ static class segTree {\n+ public int n;\n+ Node seg[];\n+\n+ public segTree(int N) {\n+ n = N;\n+ seg = new Node[4 * (int) 1e5];\n+ for (int i = 0; i < seg.length; i++) {\n+ seg[i] = new Node(0, 0);\n+ }\n+ }\n+\n+ public void update(int pos, int val) {\n+ update(1, 1, n, pos, val);\n+ }\n+\n+ public Node query(int l, int r) {\n+ if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n+ return query(1, 1, n, l, r);\n+ }\n+\n+ public void update(int p, int s, int e, int pos, int val) {\n+ if (s == pos && e == pos) {\n+ seg[p].n = val;\n+ seg[p].idx = pos;\n+ return;\n+ }\n+ if (s > pos || e < pos || s > e || e < s) return;\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ update(l, s, m, pos, val);\n+ update(r, m + 1, e, pos, val);\n+\n+ if (seg[l].n <= seg[r].n) {\n+ seg[p].n = seg[l].n;\n+ seg[p].idx = seg[l].idx;\n+ } else {\n+ seg[p].n = seg[r].n;\n+ seg[p].idx = seg[r].idx;\n+ }\n+ }\n+\n+ public Node query(int p, int s, int e, int a, int b) {\n+ if (s >= a && e <= b) {\n+ return seg[p];\n+ }\n+ if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n+\n+ int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n+\n+ Node q1 = query(l, s, m, a, b);\n+ Node q2 = query(r, m + 1, e, a, b);\n+\n+ if (q1.n <= q2.n) {\n+ return q1;\n+ } else {\n+ return q2;\n+ }\n+ }\n+ }\n+\n+ static void debug(Object... obj) {\n+ System.err.println(Arrays.deepToString(obj));\n+ }\n+\n+ static class InputReader {\n+ public BufferedReader reader;\n+ public StringTokenizer tokenizer;\n+\n+ public InputReader(InputStream stream) {\n+ reader = new BufferedReader(new InputStreamReader(stream));\n+ tokenizer = null;\n+ }\n+\n+ public String next() throws Exception {\n+ while (tokenizer == null || !tokenizer.hasMoreTokens())\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ return tokenizer.nextToken();\n+ }\n+\n+ public String nextLine() throws Exception {\n+ String line = null;\n+ tokenizer = null;\n+ line = reader.readLine();\n+ return line;\n+ }\n+\n+ public int nextInt() throws Exception {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() throws Exception {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public long nextLong() throws Exception {\n+ return Long.parseLong(next());\n+ }\n }\n }\n-\n-class item implements Comparable {\n-\n- public int value;\n- public int index;\n-\n- public item(int v, int i) {\n- value = v;\n- index = i;\n- }\n-\n- public int compareTo(item other) {\n- if (this.value != other.value) return this.value - other.value;\n- return this.index - other.index;\n- }\n-}\n-\n-class bit {\n-\n- public long[] cumfreq;\n-\n- public bit(int n) {\n-\n- int size = 1;\n- while (size < n) size <<= 1;\n- n = size;\n-\n- cumfreq = new long[n + 1];\n- }\n-\n- public void add(int index, long value) {\n- while (index < cumfreq.length) {\n- cumfreq[index] += value;\n- index += Integer.lowestOneBit(index);\n- }\n- }\n-\n- public long sum(int index) {\n- long ans = 0;\n- while (index > 0) {\n- ans += cumfreq[index];\n- index -= (Integer.lowestOneBit(index));\n- }\n- return ans;\n- }\n-\n- public long sum(int low, int high) {\n- return sum(high) - sum(low - 1);\n- }\n-\n- public long all() {\n- return sum(cumfreq.length - 1);\n- }\n-\n- public long atOrAbove(int index) {\n- long sub = 0;\n- if (index > 0) sub = sum(index - 1);\n- return all() - sub;\n- }\n-}", "output": "FASTER 0.8138", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 1.7578, "pair_id": "java_12285_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class CF831E_3 {\n public static int index;\n\n public static void main(String[] args) throws Exception {\n InputReader in = new InputReader(System.in);\n PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n int n = in.nextInt();\n int arr[] = new int[n + 1];\n segTree seg = new segTree(n);\n BIT bit = new BIT((int) 1e5 + 50);\n for (int i = 1; i <= n; i++) {\n arr[i] = in.nextInt();\n seg.update(i, arr[i]);\n bit.add(i);\n }\n\n long sum = 0;\n int last = 0;\n Node min = seg.query(1, n);\n for (int i = 1; i <= n; i++) {\n Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n if (node2.n <= node1.n) min = node2;\n else min = node1;\n\n if (min.idx > last) {\n int h = 0, l = 0;\n l = bit.low(last + 1);\n h = bit.low(min.idx + 1);\n\n sum += (long) (h - l);\n } else {\n int h = 0, l = 0;\n h = bit.high(last);\n l = bit.low(min.idx + 1);\n\n sum += (long) (h + l);\n }\n bit.remove(min.idx);\n last = min.idx;\n seg.update(min.idx, (int) 2e9);\n }\n\n pw.println(sum);\n\n pw.close();\n }\n\n static class BIT {\n public int bit[], n;\n\n public BIT(int nn) {\n n = nn;\n bit = new int[n + 1];\n }\n\n int low(int x) {\n return sum(x - 1);\n }\n\n int high(int x) {\n return sum(n) - sum(x);\n }\n\n void add(int x) {\n add(x, 1);\n }\n\n void remove(int x) {\n add(x, -1);\n }\n\n void add(int index, int value) {\n for (; index < bit.length; index = index + (index & -index)) {\n bit[index] += value;\n }\n }\n\n int sum(int index) {\n int sum = 0;\n for (; index > 0; index = index - (index & -index)) {\n sum += bit[index];\n }\n return sum;\n }\n }\n\n static class Node implements Comparable {\n int n, idx;\n\n Node(int N, int i) {\n n = N;\n idx = i;\n }\n\n public int compareTo(Node N) {\n if (n != N.n) return n - N.n;\n else return idx - N.idx;\n }\n\n public String toString() {\n return n + \" \" + idx;\n }\n }\n\n static class segTree {\n public int n;\n Node seg[];\n\n public segTree(int N) {\n n = N;\n seg = new Node[4 * (int) 1e5];\n for (int i = 0; i < seg.length; i++) {\n seg[i] = new Node(0, 0);\n }\n }\n\n public void update(int pos, int val) {\n update(1, 1, n, pos, val);\n }\n\n public Node query(int l, int r) {\n if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n return query(1, 1, n, l, r);\n }\n\n public void update(int p, int s, int e, int pos, int val) {\n if (s == pos && e == pos) {\n seg[p].n = val;\n seg[p].idx = pos;\n return;\n }\n if (s > pos || e < pos || s > e || e < s) return;\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n update(l, s, m, pos, val);\n update(r, m + 1, e, pos, val);\n\n if (seg[l].n <= seg[r].n) {\n seg[p].n = seg[l].n;\n seg[p].idx = seg[l].idx;\n } else {\n seg[p].n = seg[r].n;\n seg[p].idx = seg[r].idx;\n }\n }\n\n public Node query(int p, int s, int e, int a, int b) {\n if (s >= a && e <= b) {\n return seg[p];\n }\n if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n\n int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n\n Node q1 = query(l, s, m, a, b);\n Node q2 = query(r, m + 1, e, a, b);\n\n if (q1.n <= q2.n) {\n return q1;\n } else {\n return q2;\n }\n }\n }\n\n static void debug(Object... obj) {\n System.err.println(Arrays.deepToString(obj));\n }\n\n static class InputReader {\n public BufferedReader reader;\n public StringTokenizer tokenizer;\n\n public InputReader(InputStream stream) {\n reader = new BufferedReader(new InputStreamReader(stream));\n tokenizer = null;\n }\n\n public String next() throws Exception {\n while (tokenizer == null || !tokenizer.hasMoreTokens())\n tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n public String nextLine() throws Exception {\n String line = null;\n tokenizer = null;\n line = reader.readLine();\n return line;\n }\n\n public int nextInt() throws Exception {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws Exception {\n return Double.parseDouble(next());\n }\n\n public long nextLong() throws Exception {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class e {\n\n public static int n;\n public static ArrayList list;\n\n public static void main(String[] args) throws Exception {\n\n BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n n = Integer.parseInt(stdin.readLine());\n StringTokenizer tok = new StringTokenizer(stdin.readLine());\n list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int x = Integer.parseInt(tok.nextToken());\n list.add(new item(x, i));\n }\n Collections.sort(list);\n\n System.out.println(solve());\n }\n\n public static long solve() {\n\n int i = 0;\n\n while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n i++;\n\n if (i == n) return n;\n\n while (i < n) {\n\n int j = i;\n while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n\n if (j > i) {\n\n int lastpos = list.get(i - 1).index;\n\n int k = -1;\n for (k = i; k <= j; k++) {\n if (list.get(k).index > lastpos) {\n break;\n }\n }\n\n if (k > i) {\n\n item[] tmp = new item[j - i + 1];\n for (int z = i; z <= j; z++) {\n int ind = k + z - i;\n if (ind > j) ind -= (j - i + 1);\n tmp[z - i] = list.get(ind);\n }\n for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n }\n }\n\n i = j + 1;\n }\n\n int[] arr = new int[n];\n for (i = 0; i < n; i++) {\n arr[i] = list.get(i).index + 1;\n }\n\n long res = 0;\n bit mybit = new bit(n);\n\n for (i = 0; i < n; i++) {\n\n if (i == 0) {\n res += arr[i];\n } else {\n\n if (arr[i] > arr[i - 1]) {\n int range = arr[i] - arr[i - 1];\n\n res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n } else {\n int range = arr[i - 1] - arr[i] - 1;\n range = n - range;\n long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n\n res += (range - used);\n }\n }\n\n mybit.add(arr[i], 1L);\n }\n\n return res;\n }\n}\n\nclass item implements Comparable {\n\n public int value;\n public int index;\n\n public item(int v, int i) {\n value = v;\n index = i;\n }\n\n public int compareTo(item other) {\n if (this.value != other.value) return this.value - other.value;\n return this.index - other.index;\n }\n}\n\nclass bit {\n\n public long[] cumfreq;\n\n public bit(int n) {\n\n int size = 1;\n while (size < n) size <<= 1;\n n = size;\n\n cumfreq = new long[n + 1];\n }\n\n public void add(int index, long value) {\n while (index < cumfreq.length) {\n cumfreq[index] += value;\n index += Integer.lowestOneBit(index);\n }\n }\n\n public long sum(int index) {\n long ans = 0;\n while (index > 0) {\n ans += cumfreq[index];\n index -= (Integer.lowestOneBit(index));\n }\n return ans;\n }\n\n public long sum(int low, int high) {\n return sum(high) - sum(low - 1);\n }\n\n public long all() {\n return sum(cumfreq.length - 1);\n }\n\n public long atOrAbove(int index) {\n long sub = 0;\n if (index > 0) sub = sum(index - 1);\n return all() - sub;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class CF831E_3 {\n- public static int index;\n+public class e {\n+\n+ public static int n;\n+ public static ArrayList list;\n \n public static void main(String[] args) throws Exception {\n- InputReader in = new InputReader(System.in);\n- PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));\n- int n = in.nextInt();\n- int arr[] = new int[n + 1];\n- segTree seg = new segTree(n);\n- BIT bit = new BIT((int) 1e5 + 50);\n- for (int i = 1; i <= n; i++) {\n- arr[i] = in.nextInt();\n- seg.update(i, arr[i]);\n- bit.add(i);\n+\n+ BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));\n+ n = Integer.parseInt(stdin.readLine());\n+ StringTokenizer tok = new StringTokenizer(stdin.readLine());\n+ list = new ArrayList();\n+ for (int i = 0; i < n; i++) {\n+ int x = Integer.parseInt(tok.nextToken());\n+ list.add(new item(x, i));\n+ }\n+ Collections.sort(list);\n+\n+ System.out.println(solve());\n+ }\n+\n+ public static long solve() {\n+\n+ int i = 0;\n+\n+ while (i < n - 1 && list.get(i).value == list.get(i + 1).value) i++;\n+ i++;\n+\n+ if (i == n) return n;\n+\n+ while (i < n) {\n+\n+ int j = i;\n+ while (j < n - 1 && list.get(j).value == list.get(j + 1).value) j++;\n+\n+ if (j > i) {\n+\n+ int lastpos = list.get(i - 1).index;\n+\n+ int k = -1;\n+ for (k = i; k <= j; k++) {\n+ if (list.get(k).index > lastpos) {\n+ break;\n+ }\n+ }\n+\n+ if (k > i) {\n+\n+ item[] tmp = new item[j - i + 1];\n+ for (int z = i; z <= j; z++) {\n+ int ind = k + z - i;\n+ if (ind > j) ind -= (j - i + 1);\n+ tmp[z - i] = list.get(ind);\n+ }\n+ for (int z = i; z <= j; z++) list.set(z, tmp[z - i]);\n+ }\n+ }\n+\n+ i = j + 1;\n }\n \n- long sum = 0;\n- int last = 0;\n- Node min = seg.query(1, n);\n- for (int i = 1; i <= n; i++) {\n- Node node1 = seg.query(1, last - 1), node2 = seg.query(last + 1, n);\n- if (node2.n <= node1.n) min = node2;\n- else min = node1;\n-\n- if (min.idx > last) {\n- int h = 0, l = 0;\n- l = bit.low(last + 1);\n- h = bit.low(min.idx + 1);\n-\n- sum += (long) (h - l);\n- } else {\n- int h = 0, l = 0;\n- h = bit.high(last);\n- l = bit.low(min.idx + 1);\n-\n- sum += (long) (h + l);\n- }\n- bit.remove(min.idx);\n- last = min.idx;\n- seg.update(min.idx, (int) 2e9);\n+ int[] arr = new int[n];\n+ for (i = 0; i < n; i++) {\n+ arr[i] = list.get(i).index + 1;\n }\n \n- pw.println(sum);\n+ long res = 0;\n+ bit mybit = new bit(n);\n \n- pw.close();\n+ for (i = 0; i < n; i++) {\n+\n+ if (i == 0) {\n+ res += arr[i];\n+ } else {\n+\n+ if (arr[i] > arr[i - 1]) {\n+ int range = arr[i] - arr[i - 1];\n+\n+ res += (range - mybit.sum(arr[i - 1] + 1, arr[i]));\n+ } else {\n+ int range = arr[i - 1] - arr[i] - 1;\n+ range = n - range;\n+ long used = mybit.atOrAbove(arr[i - 1]) + mybit.sum(1, arr[i]);\n+\n+ res += (range - used);\n+ }\n+ }\n+\n+ mybit.add(arr[i], 1L);\n+ }\n+\n+ return res;\n+ }\n+}\n+\n+class item implements Comparable {\n+\n+ public int value;\n+ public int index;\n+\n+ public item(int v, int i) {\n+ value = v;\n+ index = i;\n }\n \n- static class BIT {\n- public int bit[], n;\n+ public int compareTo(item other) {\n+ if (this.value != other.value) return this.value - other.value;\n+ return this.index - other.index;\n+ }\n+}\n \n- public BIT(int nn) {\n- n = nn;\n- bit = new int[n + 1];\n- }\n+class bit {\n \n- int low(int x) {\n- return sum(x - 1);\n- }\n+ public long[] cumfreq;\n \n- int high(int x) {\n- return sum(n) - sum(x);\n- }\n+ public bit(int n) {\n \n- void add(int x) {\n- add(x, 1);\n- }\n+ int size = 1;\n+ while (size < n) size <<= 1;\n+ n = size;\n \n- void remove(int x) {\n- add(x, -1);\n- }\n+ cumfreq = new long[n + 1];\n+ }\n \n- void add(int index, int value) {\n- for (; index < bit.length; index = index + (index & -index)) {\n- bit[index] += value;\n- }\n- }\n-\n- int sum(int index) {\n- int sum = 0;\n- for (; index > 0; index = index - (index & -index)) {\n- sum += bit[index];\n- }\n- return sum;\n+ public void add(int index, long value) {\n+ while (index < cumfreq.length) {\n+ cumfreq[index] += value;\n+ index += Integer.lowestOneBit(index);\n }\n }\n \n- static class Node implements Comparable {\n- int n, idx;\n-\n- Node(int N, int i) {\n- n = N;\n- idx = i;\n+ public long sum(int index) {\n+ long ans = 0;\n+ while (index > 0) {\n+ ans += cumfreq[index];\n+ index -= (Integer.lowestOneBit(index));\n }\n-\n- public int compareTo(Node N) {\n- if (n != N.n) return n - N.n;\n- else return idx - N.idx;\n- }\n-\n- public String toString() {\n- return n + \" \" + idx;\n- }\n+ return ans;\n }\n \n- static class segTree {\n- public int n;\n- Node seg[];\n-\n- public segTree(int N) {\n- n = N;\n- seg = new Node[4 * (int) 1e5];\n- for (int i = 0; i < seg.length; i++) {\n- seg[i] = new Node(0, 0);\n- }\n- }\n-\n- public void update(int pos, int val) {\n- update(1, 1, n, pos, val);\n- }\n-\n- public Node query(int l, int r) {\n- if (l < 1 || r < 1 || l > r || l > n || r > n) return new Node((int) 2e9, 1000000);\n- return query(1, 1, n, l, r);\n- }\n-\n- public void update(int p, int s, int e, int pos, int val) {\n- if (s == pos && e == pos) {\n- seg[p].n = val;\n- seg[p].idx = pos;\n- return;\n- }\n- if (s > pos || e < pos || s > e || e < s) return;\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- update(l, s, m, pos, val);\n- update(r, m + 1, e, pos, val);\n-\n- if (seg[l].n <= seg[r].n) {\n- seg[p].n = seg[l].n;\n- seg[p].idx = seg[l].idx;\n- } else {\n- seg[p].n = seg[r].n;\n- seg[p].idx = seg[r].idx;\n- }\n- }\n-\n- public Node query(int p, int s, int e, int a, int b) {\n- if (s >= a && e <= b) {\n- return seg[p];\n- }\n- if (s > b || e < a || s > e || e < s) return new Node((int) 2e9, 1000000);\n-\n- int m = (s + e) / 2, l = 2 * p, r = 2 * p + 1;\n-\n- Node q1 = query(l, s, m, a, b);\n- Node q2 = query(r, m + 1, e, a, b);\n-\n- if (q1.n <= q2.n) {\n- return q1;\n- } else {\n- return q2;\n- }\n- }\n+ public long sum(int low, int high) {\n+ return sum(high) - sum(low - 1);\n }\n \n- static void debug(Object... obj) {\n- System.err.println(Arrays.deepToString(obj));\n+ public long all() {\n+ return sum(cumfreq.length - 1);\n }\n \n- static class InputReader {\n- public BufferedReader reader;\n- public StringTokenizer tokenizer;\n-\n- public InputReader(InputStream stream) {\n- reader = new BufferedReader(new InputStreamReader(stream));\n- tokenizer = null;\n- }\n-\n- public String next() throws Exception {\n- while (tokenizer == null || !tokenizer.hasMoreTokens())\n- tokenizer = new StringTokenizer(reader.readLine());\n- return tokenizer.nextToken();\n- }\n-\n- public String nextLine() throws Exception {\n- String line = null;\n- tokenizer = null;\n- line = reader.readLine();\n- return line;\n- }\n-\n- public int nextInt() throws Exception {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws Exception {\n- return Double.parseDouble(next());\n- }\n-\n- public long nextLong() throws Exception {\n- return Long.parseLong(next());\n- }\n+ public long atOrAbove(int index) {\n+ long sub = 0;\n+ if (index > 0) sub = sum(index - 1);\n+ return all() - sub;\n }\n }", "output": "SLOWER 0.8138", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 1.7578, "pair_id": "java_12285_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n+import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Random;\n+import java.util.StringTokenizer;\n \n public class Main {\n-\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n- Scanner in = new Scanner(inputStream);\n+ FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n- Task solver = new Task();\n- solver.solve(in, out);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n out.close();\n }\n-}\n \n-class Task {\n+ static class TaskB {\n+ Random random = new Random();\n \n- public void solve(Scanner in, PrintWriter out) {\n- int n = in.nextInt();\n- List a = new ArrayList<>(n);\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int[] a = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ int k = repaint(a);\n+ int[] nextSame = new int[n];\n+ int[] nextLarger = new int[n];\n+ int[] last = new int[k + 1];\n+ Arrays.fill(last, -1);\n+ for (int step = 0; step < 2 * n; step++) {\n+ int i = -step % n;\n+ if (i < 0) {\n+ i += n;\n+ }\n+ nextSame[i] = last[a[i]];\n+ nextLarger[i] = last[a[i] + 1];\n+ last[a[i]] = i;\n+ }\n \n- for (int i = 0; i < n; i++) {\n- int x = in.nextInt();\n- a.add(new Vect(x, i));\n- }\n- a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n-\n- int val = a.get(0).a;\n- int start = 0;\n- int mid = -1;\n- int pos = -1;\n- for (int i = 0; i < n; i++) {\n- Vect v = a.get(i);\n- if (val == v.a) {\n- if (v.b > pos && mid == -1) {\n- mid = i;\n+ int[] tree = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ add(tree, i, 1);\n+ }\n+ int first = -1;\n+ for (int i = 0; i < n; i++) {\n+ if (a[i] == 0) {\n+ first = i;\n+ break;\n }\n }\n- if (val != v.a) {\n- if (mid == -1) {\n- mid = i;\n+ long ans = 0;\n+ int x = 0;\n+ for (int i = 0; i < n; i++) {\n+ int nx;\n+ if (i == 0) {\n+ nx = first;\n+ } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n+ nx = nextSame[x];\n+ } else {\n+ nx = nextLarger[x];\n }\n- swap(a, start, mid, i);\n- start = i;\n- pos = a.get(i - 1).b;\n- mid = -1;\n- val = a.get(i).a;\n- if (v.b > pos && mid == -1) {\n- mid = i;\n+ if (x <= nx) {\n+ ans += sum(tree, x, nx);\n+ } else {\n+ ans += sum(tree, x, n - 1);\n+ ans += sum(tree, 0, nx);\n+ }\n+ x = nx;\n+ add(tree, x, -1);\n+ }\n+ out.println(ans);\n+ }\n+\n+ private void add(int[] tree, int pos, int val) {\n+ while (pos < tree.length) {\n+ tree[pos] += val;\n+ pos |= pos + 1;\n+ }\n+ }\n+\n+ private int sum(int[] tree, int l, int r) {\n+ return sum(tree, r) - sum(tree, l - 1);\n+ }\n+\n+ private int sum(int[] tree, int r) {\n+ int res = 0;\n+ while (r >= 0) {\n+ res += tree[r];\n+ r = (r & (r + 1)) - 1;\n+ }\n+ return res;\n+ }\n+\n+ private int repaint(int[] a) {\n+ int[] b = a.clone();\n+ randomShuffle(b);\n+ Arrays.sort(b);\n+ int k = 0;\n+ for (int i = 0; i < b.length; i++) {\n+ if (i == 0 || b[i] != b[i - 1]) {\n+ b[k++] = b[i];\n }\n }\n+ for (int i = 0; i < a.length; i++) {\n+ a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n+ }\n+ return k;\n }\n- if (mid == -1) {\n- mid = n;\n+\n+ private void randomShuffle(int[] a) {\n+ for (int i = 0; i < a.length; i++) {\n+ int j = random.nextInt(i + 1);\n+ int t = a[i];\n+ a[i] = a[j];\n+ a[j] = t;\n+ }\n }\n- swap(a, start, mid, n);\n-\n- long sum = 0;\n- int t = n;\n- int prev = -1;\n- for (int i = 0; i < a.size(); i++) {\n- int cur = a.get(i).b;\n- if (cur < prev) {\n- sum += t;\n- t = n - i;\n- }\n- prev = cur;\n- }\n- sum += t;\n- System.out.println(sum);\n }\n \n- public void swap(List v, int s, int mid, int f) {\n- List temp = new ArrayList<>(mid - s);\n- for (int i = s; i < mid; i++) {\n- temp.add(v.get(i));\n+ static class FastScanner {\n+ private BufferedReader in;\n+ private StringTokenizer st;\n+\n+ public FastScanner(InputStream stream) {\n+ in = new BufferedReader(new InputStreamReader(stream));\n }\n- for (int i = mid; i < f; i++) {\n- v.set(i - temp.size(), v.get(i));\n+\n+ public String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ String rl = in.readLine();\n+ if (rl == null) {\n+ return null;\n+ }\n+ st = new StringTokenizer(rl);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n+ return st.nextToken();\n }\n- for (int i = 0; i < temp.size(); i++) {\n- v.set(f - temp.size() + i, temp.get(i));\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n }\n }\n }\n-\n-class Utils {\n-\n- public static int binarySearch(int[] a, int key) {\n- int s = 0;\n- int f = a.length;\n- while (f > s) {\n- int mid = (s + f) / 2;\n- if (a[mid] > key) {\n- f = mid - 1;\n- } else if (a[mid] <= key) {\n- s = mid + 1;\n- }\n- }\n- return -1;\n- }\n-\n- public static long gcd(long a, long b) {\n- return b != 0 ? gcd(b, a % b) : a;\n- }\n-\n- public static long lcm(long a, long b) {\n- return a / gcd(a, b) * b;\n- }\n-\n- static List prime(int number) {\n- List a = new ArrayList<>();\n- for (int i = 2; i * i <= number; i++) {\n- if (number % i == 0) {\n- a.add(i);\n- number /= i;\n- i = 1;\n- }\n- }\n- a.add(number);\n- return a;\n- }\n-}\n-\n-class Pair {\n- public T a;\n- public U b;\n-\n- public Pair(T a, U b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Pair pair = (Pair) o;\n-\n- if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n- return b != null ? b.equals(pair.b) : pair.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Vect {\n- public int a;\n- public int b;\n-\n- public Vect(int a, int b) {\n- this.a = a;\n- this.b = b;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Vect vect = (Vect) o;\n-\n- if (a != vect.a) return false;\n- return b == vect.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Tri {\n- public int a;\n- public int b;\n- public int c;\n-\n- public Tri(int a, int b, int c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Tri tri = (Tri) o;\n-\n- if (a != tri.a) return false;\n- return b == tri.b;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a;\n- result = 31 * result + b;\n- return result;\n- }\n-}\n-\n-class Triple {\n- public T a;\n- public U b;\n- public P c;\n-\n- public Triple(T a, U b, P c) {\n- this.a = a;\n- this.b = b;\n- this.c = c;\n- }\n-\n- @Override\n- public boolean equals(Object o) {\n- if (this == o) return true;\n- if (o == null || getClass() != o.getClass()) return false;\n-\n- Triple triple = (Triple) o;\n-\n- if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n- return b != null ? b.equals(triple.b) : triple.b == null;\n- }\n-\n- @Override\n- public int hashCode() {\n- int result = a != null ? a.hashCode() : 0;\n- result = 31 * result + (b != null ? b.hashCode() : 0);\n- return result;\n- }\n-}\n-\n-class Scanner {\n- BufferedReader in;\n- StringTokenizer tok;\n-\n- public Scanner(InputStream in) {\n- this.in = new BufferedReader(new InputStreamReader(in));\n- tok = new StringTokenizer(\"\");\n- }\n-\n- private String tryReadNextLine() {\n- try {\n- return in.readLine();\n- } catch (Exception e) {\n- throw new InputMismatchException();\n- }\n- }\n-\n- public String nextToken() {\n- while (!tok.hasMoreTokens()) {\n- tok = new StringTokenizer(next());\n- }\n- return tok.nextToken();\n- }\n-\n- public String next() {\n- String newLine = tryReadNextLine();\n- if (newLine == null) throw new InputMismatchException();\n- return newLine;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(nextToken());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(nextToken());\n- }\n-}", "output": "FASTER 0.1578", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 1.1156, "pair_id": "java_12292_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n Task solver = new Task();\n solver.solve(in, out);\n out.close();\n }\n}\n\nclass Task {\n\n public void solve(Scanner in, PrintWriter out) {\n int n = in.nextInt();\n List a = new ArrayList<>(n);\n\n for (int i = 0; i < n; i++) {\n int x = in.nextInt();\n a.add(new Vect(x, i));\n }\n a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n\n int val = a.get(0).a;\n int start = 0;\n int mid = -1;\n int pos = -1;\n for (int i = 0; i < n; i++) {\n Vect v = a.get(i);\n if (val == v.a) {\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n if (val != v.a) {\n if (mid == -1) {\n mid = i;\n }\n swap(a, start, mid, i);\n start = i;\n pos = a.get(i - 1).b;\n mid = -1;\n val = a.get(i).a;\n if (v.b > pos && mid == -1) {\n mid = i;\n }\n }\n }\n if (mid == -1) {\n mid = n;\n }\n swap(a, start, mid, n);\n\n long sum = 0;\n int t = n;\n int prev = -1;\n for (int i = 0; i < a.size(); i++) {\n int cur = a.get(i).b;\n if (cur < prev) {\n sum += t;\n t = n - i;\n }\n prev = cur;\n }\n sum += t;\n System.out.println(sum);\n }\n\n public void swap(List v, int s, int mid, int f) {\n List temp = new ArrayList<>(mid - s);\n for (int i = s; i < mid; i++) {\n temp.add(v.get(i));\n }\n for (int i = mid; i < f; i++) {\n v.set(i - temp.size(), v.get(i));\n }\n for (int i = 0; i < temp.size(); i++) {\n v.set(f - temp.size() + i, temp.get(i));\n }\n }\n}\n\nclass Utils {\n\n public static int binarySearch(int[] a, int key) {\n int s = 0;\n int f = a.length;\n while (f > s) {\n int mid = (s + f) / 2;\n if (a[mid] > key) {\n f = mid - 1;\n } else if (a[mid] <= key) {\n s = mid + 1;\n }\n }\n return -1;\n }\n\n public static long gcd(long a, long b) {\n return b != 0 ? gcd(b, a % b) : a;\n }\n\n public static long lcm(long a, long b) {\n return a / gcd(a, b) * b;\n }\n\n static List prime(int number) {\n List a = new ArrayList<>();\n for (int i = 2; i * i <= number; i++) {\n if (number % i == 0) {\n a.add(i);\n number /= i;\n i = 1;\n }\n }\n a.add(number);\n return a;\n }\n}\n\nclass Pair {\n public T a;\n public U b;\n\n public Pair(T a, U b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Pair pair = (Pair) o;\n\n if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n return b != null ? b.equals(pair.b) : pair.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Vect {\n public int a;\n public int b;\n\n public Vect(int a, int b) {\n this.a = a;\n this.b = b;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Vect vect = (Vect) o;\n\n if (a != vect.a) return false;\n return b == vect.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Tri {\n public int a;\n public int b;\n public int c;\n\n public Tri(int a, int b, int c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Tri tri = (Tri) o;\n\n if (a != tri.a) return false;\n return b == tri.b;\n }\n\n @Override\n public int hashCode() {\n int result = a;\n result = 31 * result + b;\n return result;\n }\n}\n\nclass Triple {\n public T a;\n public U b;\n public P c;\n\n public Triple(T a, U b, P c) {\n this.a = a;\n this.b = b;\n this.c = c;\n }\n\n @Override\n public boolean equals(Object o) {\n if (this == o) return true;\n if (o == null || getClass() != o.getClass()) return false;\n\n Triple triple = (Triple) o;\n\n if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n return b != null ? b.equals(triple.b) : triple.b == null;\n }\n\n @Override\n public int hashCode() {\n int result = a != null ? a.hashCode() : 0;\n result = 31 * result + (b != null ? b.hashCode() : 0);\n return result;\n }\n}\n\nclass Scanner {\n BufferedReader in;\n StringTokenizer tok;\n\n public Scanner(InputStream in) {\n this.in = new BufferedReader(new InputStreamReader(in));\n tok = new StringTokenizer(\"\");\n }\n\n private String tryReadNextLine() {\n try {\n return in.readLine();\n } catch (Exception e) {\n throw new InputMismatchException();\n }\n }\n\n public String nextToken() {\n while (!tok.hasMoreTokens()) {\n tok = new StringTokenizer(next());\n }\n return tok.nextToken();\n }\n\n public String next() {\n String newLine = tryReadNextLine();\n if (newLine == null) throw new InputMismatchException();\n return newLine;\n }\n\n public int nextInt() {\n return Integer.parseInt(nextToken());\n }\n\n public long nextLong() {\n return Long.parseLong(nextToken());\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Random;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n public class Main {\n+\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n+ Scanner in = new Scanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n+ Task solver = new Task();\n+ solver.solve(in, out);\n out.close();\n }\n-\n- static class TaskB {\n- Random random = new Random();\n-\n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int[] a = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- int k = repaint(a);\n- int[] nextSame = new int[n];\n- int[] nextLarger = new int[n];\n- int[] last = new int[k + 1];\n- Arrays.fill(last, -1);\n- for (int step = 0; step < 2 * n; step++) {\n- int i = -step % n;\n- if (i < 0) {\n- i += n;\n+}\n+\n+class Task {\n+\n+ public void solve(Scanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ List a = new ArrayList<>(n);\n+\n+ for (int i = 0; i < n; i++) {\n+ int x = in.nextInt();\n+ a.add(new Vect(x, i));\n+ }\n+ a.sort(Comparator.comparingInt((Vect o) -> o.a).thenComparingInt((Vect o) -> o.b));\n+\n+ int val = a.get(0).a;\n+ int start = 0;\n+ int mid = -1;\n+ int pos = -1;\n+ for (int i = 0; i < n; i++) {\n+ Vect v = a.get(i);\n+ if (val == v.a) {\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n }\n- nextSame[i] = last[a[i]];\n- nextLarger[i] = last[a[i] + 1];\n- last[a[i]] = i;\n- }\n-\n- int[] tree = new int[n];\n- for (int i = 0; i < n; i++) {\n- add(tree, i, 1);\n- }\n- int first = -1;\n- for (int i = 0; i < n; i++) {\n- if (a[i] == 0) {\n- first = i;\n- break;\n+ }\n+ if (val != v.a) {\n+ if (mid == -1) {\n+ mid = i;\n }\n- }\n- long ans = 0;\n- int x = 0;\n- for (int i = 0; i < n; i++) {\n- int nx;\n- if (i == 0) {\n- nx = first;\n- } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n- nx = nextSame[x];\n- } else {\n- nx = nextLarger[x];\n+ swap(a, start, mid, i);\n+ start = i;\n+ pos = a.get(i - 1).b;\n+ mid = -1;\n+ val = a.get(i).a;\n+ if (v.b > pos && mid == -1) {\n+ mid = i;\n }\n- if (x <= nx) {\n- ans += sum(tree, x, nx);\n- } else {\n- ans += sum(tree, x, n - 1);\n- ans += sum(tree, 0, nx);\n- }\n- x = nx;\n- add(tree, x, -1);\n- }\n- out.println(ans);\n- }\n-\n- private void add(int[] tree, int pos, int val) {\n- while (pos < tree.length) {\n- tree[pos] += val;\n- pos |= pos + 1;\n- }\n- }\n-\n- private int sum(int[] tree, int l, int r) {\n- return sum(tree, r) - sum(tree, l - 1);\n- }\n-\n- private int sum(int[] tree, int r) {\n- int res = 0;\n- while (r >= 0) {\n- res += tree[r];\n- r = (r & (r + 1)) - 1;\n- }\n- return res;\n- }\n-\n- private int repaint(int[] a) {\n- int[] b = a.clone();\n- randomShuffle(b);\n- Arrays.sort(b);\n- int k = 0;\n- for (int i = 0; i < b.length; i++) {\n- if (i == 0 || b[i] != b[i - 1]) {\n- b[k++] = b[i];\n- }\n- }\n- for (int i = 0; i < a.length; i++) {\n- a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n- }\n- return k;\n- }\n-\n- private void randomShuffle(int[] a) {\n- for (int i = 0; i < a.length; i++) {\n- int j = random.nextInt(i + 1);\n- int t = a[i];\n- a[i] = a[j];\n- a[j] = t;\n- }\n- }\n- }\n-\n- static class FastScanner {\n- private BufferedReader in;\n- private StringTokenizer st;\n-\n- public FastScanner(InputStream stream) {\n- in = new BufferedReader(new InputStreamReader(stream));\n- }\n-\n- public String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- String rl = in.readLine();\n- if (rl == null) {\n- return null;\n- }\n- st = new StringTokenizer(rl);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n- return st.nextToken();\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n- }\n-}\n+ }\n+ }\n+ if (mid == -1) {\n+ mid = n;\n+ }\n+ swap(a, start, mid, n);\n+\n+ long sum = 0;\n+ int t = n;\n+ int prev = -1;\n+ for (int i = 0; i < a.size(); i++) {\n+ int cur = a.get(i).b;\n+ if (cur < prev) {\n+ sum += t;\n+ t = n - i;\n+ }\n+ prev = cur;\n+ }\n+ sum += t;\n+ System.out.println(sum);\n+ }\n+\n+ public void swap(List v, int s, int mid, int f) {\n+ List temp = new ArrayList<>(mid - s);\n+ for (int i = s; i < mid; i++) {\n+ temp.add(v.get(i));\n+ }\n+ for (int i = mid; i < f; i++) {\n+ v.set(i - temp.size(), v.get(i));\n+ }\n+ for (int i = 0; i < temp.size(); i++) {\n+ v.set(f - temp.size() + i, temp.get(i));\n+ }\n+ }\n+}\n+\n+class Utils {\n+\n+ public static int binarySearch(int[] a, int key) {\n+ int s = 0;\n+ int f = a.length;\n+ while (f > s) {\n+ int mid = (s + f) / 2;\n+ if (a[mid] > key) {\n+ f = mid - 1;\n+ } else if (a[mid] <= key) {\n+ s = mid + 1;\n+ }\n+ }\n+ return -1;\n+ }\n+\n+ public static long gcd(long a, long b) {\n+ return b != 0 ? gcd(b, a % b) : a;\n+ }\n+\n+ public static long lcm(long a, long b) {\n+ return a / gcd(a, b) * b;\n+ }\n+\n+ static List prime(int number) {\n+ List a = new ArrayList<>();\n+ for (int i = 2; i * i <= number; i++) {\n+ if (number % i == 0) {\n+ a.add(i);\n+ number /= i;\n+ i = 1;\n+ }\n+ }\n+ a.add(number);\n+ return a;\n+ }\n+}\n+\n+class Pair {\n+ public T a;\n+ public U b;\n+\n+ public Pair(T a, U b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Pair pair = (Pair) o;\n+\n+ if (a != null ? !a.equals(pair.a) : pair.a != null) return false;\n+ return b != null ? b.equals(pair.b) : pair.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Vect {\n+ public int a;\n+ public int b;\n+\n+ public Vect(int a, int b) {\n+ this.a = a;\n+ this.b = b;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Vect vect = (Vect) o;\n+\n+ if (a != vect.a) return false;\n+ return b == vect.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Tri {\n+ public int a;\n+ public int b;\n+ public int c;\n+\n+ public Tri(int a, int b, int c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Tri tri = (Tri) o;\n+\n+ if (a != tri.a) return false;\n+ return b == tri.b;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a;\n+ result = 31 * result + b;\n+ return result;\n+ }\n+}\n+\n+class Triple {\n+ public T a;\n+ public U b;\n+ public P c;\n+\n+ public Triple(T a, U b, P c) {\n+ this.a = a;\n+ this.b = b;\n+ this.c = c;\n+ }\n+\n+ @Override\n+ public boolean equals(Object o) {\n+ if (this == o) return true;\n+ if (o == null || getClass() != o.getClass()) return false;\n+\n+ Triple triple = (Triple) o;\n+\n+ if (a != null ? !a.equals(triple.a) : triple.a != null) return false;\n+ return b != null ? b.equals(triple.b) : triple.b == null;\n+ }\n+\n+ @Override\n+ public int hashCode() {\n+ int result = a != null ? a.hashCode() : 0;\n+ result = 31 * result + (b != null ? b.hashCode() : 0);\n+ return result;\n+ }\n+}\n+\n+class Scanner {\n+ BufferedReader in;\n+ StringTokenizer tok;\n+\n+ public Scanner(InputStream in) {\n+ this.in = new BufferedReader(new InputStreamReader(in));\n+ tok = new StringTokenizer(\"\");\n+ }\n+\n+ private String tryReadNextLine() {\n+ try {\n+ return in.readLine();\n+ } catch (Exception e) {\n+ throw new InputMismatchException();\n+ }\n+ }\n+\n+ public String nextToken() {\n+ while (!tok.hasMoreTokens()) {\n+ tok = new StringTokenizer(next());\n+ }\n+ return tok.nextToken();\n+ }\n+\n+ public String next() {\n+ String newLine = tryReadNextLine();\n+ if (newLine == null) throw new InputMismatchException();\n+ return newLine;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(nextToken());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(nextToken());\n+ }\n+}", "output": "SLOWER 0.1578", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 1.1156, "pair_id": "java_12292_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class E {\n static class Pair implements Comparable {\n int num, idx;\n\n Pair(int n, int i) {\n num = n;\n idx = i;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return num - pair.num;\n }\n }\n\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = sc.nextInt();\n int[] idx = new int[100_001];\n Pair[] a = new Pair[n];\n for (int i = 0; i < n; i++) {\n a[i] = new Pair(sc.nextInt(), i);\n }\n Arrays.sort(a);\n for (int i = 0; i < n; i++) {\n idx[i] = a[i].idx;\n }\n SegmentTree st = new SegmentTree(n + n);\n long res = 0;\n int startIdx = 0;\n TreeSet indices = new TreeSet<>();\n for (int i = 0; i < n; i++) {\n if (!indices.isEmpty()) {\n Integer curIdx1 = indices.higher(startIdx - 1);\n Integer curIdx2 = indices.first();\n int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n indices.remove(chosen);\n if (startIdx == chosen) {\n res++;\n startIdx = (startIdx + 1) % n;\n } else {\n int wantedIdx = chosen - 1;\n int nstartIdx = (chosen + 1) % n;\n if (startIdx > wantedIdx) wantedIdx += n;\n res += st.query(startIdx, wantedIdx) + 1;\n startIdx = nstartIdx;\n }\n st.update(chosen);\n st.update(chosen + n);\n } else {\n indices.add(idx[i]);\n for (int j = i + 1; j < n; j++)\n if (a[j].num == a[i].num) indices.add(idx[j]);\n else break;\n i--;\n }\n }\n\n out.println(res);\n out.flush();\n out.close();\n }\n\n static class SegmentTree {\n int n;\n int[] t;\n\n SegmentTree(int nn) {\n n = nn;\n t = new int[n << 1 << 1];\n build(1, 0, n - 1);\n }\n\n void build(int node, int s, int e) {\n if (s == e) t[node] = 1;\n else {\n int mid = (s + e) >> 1;\n build(node << 1, s, mid);\n build(node << 1 | 1, mid + 1, e);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n void update(int idx) {\n update(1, 0, n - 1, idx);\n }\n\n void update(int node, int s, int e, int idx) {\n if (s == e && s == idx) t[node] = 0;\n else if (idx > e || idx < s) return;\n else {\n int mid = (s + e) >> 1;\n update(node << 1, s, mid, idx);\n update(node << 1 | 1, mid + 1, e, idx);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n int query(int s, int e) {\n return query(1, 0, n - 1, s, e);\n }\n\n int query(int node, int s, int e, int l, int r) {\n if (s >= l && e <= r) return t[node];\n else if (s > r || e < l) return 0;\n else {\n int mid = (s + e) >> 1;\n return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n }\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n+import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Random;\n+import java.util.StringTokenizer;\n \n-public class E {\n- static class Pair implements Comparable {\n- int num, idx;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ FastScanner in = new FastScanner(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskB solver = new TaskB();\n+ solver.solve(1, in, out);\n+ out.close();\n+ }\n \n- Pair(int n, int i) {\n- num = n;\n- idx = i;\n+ static class TaskB {\n+ Random random = new Random();\n+\n+ public void solve(int testNumber, FastScanner in, PrintWriter out) {\n+ int n = in.nextInt();\n+ int[] a = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = in.nextInt();\n+ }\n+ int k = repaint(a);\n+ int[] nextSame = new int[n];\n+ int[] nextLarger = new int[n];\n+ int[] last = new int[k + 1];\n+ Arrays.fill(last, -1);\n+ for (int step = 0; step < 2 * n; step++) {\n+ int i = -step % n;\n+ if (i < 0) {\n+ i += n;\n+ }\n+ nextSame[i] = last[a[i]];\n+ nextLarger[i] = last[a[i] + 1];\n+ last[a[i]] = i;\n+ }\n+\n+ int[] tree = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ add(tree, i, 1);\n+ }\n+ int first = -1;\n+ for (int i = 0; i < n; i++) {\n+ if (a[i] == 0) {\n+ first = i;\n+ break;\n+ }\n+ }\n+ long ans = 0;\n+ int x = 0;\n+ for (int i = 0; i < n; i++) {\n+ int nx;\n+ if (i == 0) {\n+ nx = first;\n+ } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n+ nx = nextSame[x];\n+ } else {\n+ nx = nextLarger[x];\n+ }\n+ if (x <= nx) {\n+ ans += sum(tree, x, nx);\n+ } else {\n+ ans += sum(tree, x, n - 1);\n+ ans += sum(tree, 0, nx);\n+ }\n+ x = nx;\n+ add(tree, x, -1);\n+ }\n+ out.println(ans);\n }\n \n- @Override\n- public int compareTo(Pair pair) {\n- return num - pair.num;\n- }\n- }\n-\n- public static void main(String[] args) throws Exception {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- int[] idx = new int[100_001];\n- Pair[] a = new Pair[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = new Pair(sc.nextInt(), i);\n- }\n- Arrays.sort(a);\n- for (int i = 0; i < n; i++) {\n- idx[i] = a[i].idx;\n- }\n- SegmentTree st = new SegmentTree(n + n);\n- long res = 0;\n- int startIdx = 0;\n- TreeSet indices = new TreeSet<>();\n- for (int i = 0; i < n; i++) {\n- if (!indices.isEmpty()) {\n- Integer curIdx1 = indices.higher(startIdx - 1);\n- Integer curIdx2 = indices.first();\n- int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n- indices.remove(chosen);\n- if (startIdx == chosen) {\n- res++;\n- startIdx = (startIdx + 1) % n;\n- } else {\n- int wantedIdx = chosen - 1;\n- int nstartIdx = (chosen + 1) % n;\n- if (startIdx > wantedIdx) wantedIdx += n;\n- res += st.query(startIdx, wantedIdx) + 1;\n- startIdx = nstartIdx;\n- }\n- st.update(chosen);\n- st.update(chosen + n);\n- } else {\n- indices.add(idx[i]);\n- for (int j = i + 1; j < n; j++)\n- if (a[j].num == a[i].num) indices.add(idx[j]);\n- else break;\n- i--;\n+ private void add(int[] tree, int pos, int val) {\n+ while (pos < tree.length) {\n+ tree[pos] += val;\n+ pos |= pos + 1;\n }\n }\n \n- out.println(res);\n- out.flush();\n- out.close();\n- }\n-\n- static class SegmentTree {\n- int n;\n- int[] t;\n-\n- SegmentTree(int nn) {\n- n = nn;\n- t = new int[n << 1 << 1];\n- build(1, 0, n - 1);\n+ private int sum(int[] tree, int l, int r) {\n+ return sum(tree, r) - sum(tree, l - 1);\n }\n \n- void build(int node, int s, int e) {\n- if (s == e) t[node] = 1;\n- else {\n- int mid = (s + e) >> 1;\n- build(node << 1, s, mid);\n- build(node << 1 | 1, mid + 1, e);\n- t[node] = t[node << 1] + t[node << 1 | 1];\n+ private int sum(int[] tree, int r) {\n+ int res = 0;\n+ while (r >= 0) {\n+ res += tree[r];\n+ r = (r & (r + 1)) - 1;\n }\n+ return res;\n }\n \n- void update(int idx) {\n- update(1, 0, n - 1, idx);\n+ private int repaint(int[] a) {\n+ int[] b = a.clone();\n+ randomShuffle(b);\n+ Arrays.sort(b);\n+ int k = 0;\n+ for (int i = 0; i < b.length; i++) {\n+ if (i == 0 || b[i] != b[i - 1]) {\n+ b[k++] = b[i];\n+ }\n+ }\n+ for (int i = 0; i < a.length; i++) {\n+ a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n+ }\n+ return k;\n }\n \n- void update(int node, int s, int e, int idx) {\n- if (s == e && s == idx) t[node] = 0;\n- else if (idx > e || idx < s) return;\n- else {\n- int mid = (s + e) >> 1;\n- update(node << 1, s, mid, idx);\n- update(node << 1 | 1, mid + 1, e, idx);\n- t[node] = t[node << 1] + t[node << 1 | 1];\n- }\n- }\n-\n- int query(int s, int e) {\n- return query(1, 0, n - 1, s, e);\n- }\n-\n- int query(int node, int s, int e, int l, int r) {\n- if (s >= l && e <= r) return t[node];\n- else if (s > r || e < l) return 0;\n- else {\n- int mid = (s + e) >> 1;\n- return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n+ private void randomShuffle(int[] a) {\n+ for (int i = 0; i < a.length; i++) {\n+ int j = random.nextInt(i + 1);\n+ int t = a[i];\n+ a[i] = a[j];\n+ a[j] = t;\n }\n }\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n+ static class FastScanner {\n+ private BufferedReader in;\n+ private StringTokenizer st;\n \n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n+ public FastScanner(InputStream stream) {\n+ in = new BufferedReader(new InputStreamReader(stream));\n }\n \n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ public String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ String rl = in.readLine();\n+ if (rl == null) {\n+ return null;\n+ }\n+ st = new StringTokenizer(rl);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ }\n return st.nextToken();\n }\n \n- public int nextInt() throws IOException {\n+ public int nextInt() {\n return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n }\n }\n }", "output": "FASTER 0.1875", "problem_id": "830_B", "direction": "forward", "speedup_ratio": 1.1388, "pair_id": "java_12293_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.Random;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskB solver = new TaskB();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskB {\n Random random = new Random();\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n int n = in.nextInt();\n int[] a = new int[n];\n for (int i = 0; i < n; i++) {\n a[i] = in.nextInt();\n }\n int k = repaint(a);\n int[] nextSame = new int[n];\n int[] nextLarger = new int[n];\n int[] last = new int[k + 1];\n Arrays.fill(last, -1);\n for (int step = 0; step < 2 * n; step++) {\n int i = -step % n;\n if (i < 0) {\n i += n;\n }\n nextSame[i] = last[a[i]];\n nextLarger[i] = last[a[i] + 1];\n last[a[i]] = i;\n }\n\n int[] tree = new int[n];\n for (int i = 0; i < n; i++) {\n add(tree, i, 1);\n }\n int first = -1;\n for (int i = 0; i < n; i++) {\n if (a[i] == 0) {\n first = i;\n break;\n }\n }\n long ans = 0;\n int x = 0;\n for (int i = 0; i < n; i++) {\n int nx;\n if (i == 0) {\n nx = first;\n } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n nx = nextSame[x];\n } else {\n nx = nextLarger[x];\n }\n if (x <= nx) {\n ans += sum(tree, x, nx);\n } else {\n ans += sum(tree, x, n - 1);\n ans += sum(tree, 0, nx);\n }\n x = nx;\n add(tree, x, -1);\n }\n out.println(ans);\n }\n\n private void add(int[] tree, int pos, int val) {\n while (pos < tree.length) {\n tree[pos] += val;\n pos |= pos + 1;\n }\n }\n\n private int sum(int[] tree, int l, int r) {\n return sum(tree, r) - sum(tree, l - 1);\n }\n\n private int sum(int[] tree, int r) {\n int res = 0;\n while (r >= 0) {\n res += tree[r];\n r = (r & (r + 1)) - 1;\n }\n return res;\n }\n\n private int repaint(int[] a) {\n int[] b = a.clone();\n randomShuffle(b);\n Arrays.sort(b);\n int k = 0;\n for (int i = 0; i < b.length; i++) {\n if (i == 0 || b[i] != b[i - 1]) {\n b[k++] = b[i];\n }\n }\n for (int i = 0; i < a.length; i++) {\n a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n }\n return k;\n }\n\n private void randomShuffle(int[] a) {\n for (int i = 0; i < a.length; i++) {\n int j = random.nextInt(i + 1);\n int t = a[i];\n a[i] = a[j];\n a[j] = t;\n }\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n String rl = in.readLine();\n if (rl == null) {\n return null;\n }\n st = new StringTokenizer(rl);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class E {\n static class Pair implements Comparable {\n int num, idx;\n\n Pair(int n, int i) {\n num = n;\n idx = i;\n }\n\n @Override\n public int compareTo(Pair pair) {\n return num - pair.num;\n }\n }\n\n public static void main(String[] args) throws Exception {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = sc.nextInt();\n int[] idx = new int[100_001];\n Pair[] a = new Pair[n];\n for (int i = 0; i < n; i++) {\n a[i] = new Pair(sc.nextInt(), i);\n }\n Arrays.sort(a);\n for (int i = 0; i < n; i++) {\n idx[i] = a[i].idx;\n }\n SegmentTree st = new SegmentTree(n + n);\n long res = 0;\n int startIdx = 0;\n TreeSet indices = new TreeSet<>();\n for (int i = 0; i < n; i++) {\n if (!indices.isEmpty()) {\n Integer curIdx1 = indices.higher(startIdx - 1);\n Integer curIdx2 = indices.first();\n int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n indices.remove(chosen);\n if (startIdx == chosen) {\n res++;\n startIdx = (startIdx + 1) % n;\n } else {\n int wantedIdx = chosen - 1;\n int nstartIdx = (chosen + 1) % n;\n if (startIdx > wantedIdx) wantedIdx += n;\n res += st.query(startIdx, wantedIdx) + 1;\n startIdx = nstartIdx;\n }\n st.update(chosen);\n st.update(chosen + n);\n } else {\n indices.add(idx[i]);\n for (int j = i + 1; j < n; j++)\n if (a[j].num == a[i].num) indices.add(idx[j]);\n else break;\n i--;\n }\n }\n\n out.println(res);\n out.flush();\n out.close();\n }\n\n static class SegmentTree {\n int n;\n int[] t;\n\n SegmentTree(int nn) {\n n = nn;\n t = new int[n << 1 << 1];\n build(1, 0, n - 1);\n }\n\n void build(int node, int s, int e) {\n if (s == e) t[node] = 1;\n else {\n int mid = (s + e) >> 1;\n build(node << 1, s, mid);\n build(node << 1 | 1, mid + 1, e);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n void update(int idx) {\n update(1, 0, n - 1, idx);\n }\n\n void update(int node, int s, int e, int idx) {\n if (s == e && s == idx) t[node] = 0;\n else if (idx > e || idx < s) return;\n else {\n int mid = (s + e) >> 1;\n update(node << 1, s, mid, idx);\n update(node << 1 | 1, mid + 1, e, idx);\n t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n\n int query(int s, int e) {\n return query(1, 0, n - 1, s, e);\n }\n\n int query(int node, int s, int e, int l, int r) {\n if (s >= l && e <= r) return t[node];\n else if (s > r || e < l) return 0;\n else {\n int mid = (s + e) >> 1;\n return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n }\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.OutputStream;\n import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.Random;\n-import java.util.StringTokenizer;\n+import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- FastScanner in = new FastScanner(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskB solver = new TaskB();\n- solver.solve(1, in, out);\n+public class E {\n+ static class Pair implements Comparable {\n+ int num, idx;\n+\n+ Pair(int n, int i) {\n+ num = n;\n+ idx = i;\n+ }\n+\n+ @Override\n+ public int compareTo(Pair pair) {\n+ return num - pair.num;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ int[] idx = new int[100_001];\n+ Pair[] a = new Pair[n];\n+ for (int i = 0; i < n; i++) {\n+ a[i] = new Pair(sc.nextInt(), i);\n+ }\n+ Arrays.sort(a);\n+ for (int i = 0; i < n; i++) {\n+ idx[i] = a[i].idx;\n+ }\n+ SegmentTree st = new SegmentTree(n + n);\n+ long res = 0;\n+ int startIdx = 0;\n+ TreeSet indices = new TreeSet<>();\n+ for (int i = 0; i < n; i++) {\n+ if (!indices.isEmpty()) {\n+ Integer curIdx1 = indices.higher(startIdx - 1);\n+ Integer curIdx2 = indices.first();\n+ int chosen = curIdx1 == null ? curIdx2 : curIdx1;\n+ indices.remove(chosen);\n+ if (startIdx == chosen) {\n+ res++;\n+ startIdx = (startIdx + 1) % n;\n+ } else {\n+ int wantedIdx = chosen - 1;\n+ int nstartIdx = (chosen + 1) % n;\n+ if (startIdx > wantedIdx) wantedIdx += n;\n+ res += st.query(startIdx, wantedIdx) + 1;\n+ startIdx = nstartIdx;\n+ }\n+ st.update(chosen);\n+ st.update(chosen + n);\n+ } else {\n+ indices.add(idx[i]);\n+ for (int j = i + 1; j < n; j++)\n+ if (a[j].num == a[i].num) indices.add(idx[j]);\n+ else break;\n+ i--;\n+ }\n+ }\n+\n+ out.println(res);\n+ out.flush();\n out.close();\n }\n \n- static class TaskB {\n- Random random = new Random();\n+ static class SegmentTree {\n+ int n;\n+ int[] t;\n \n- public void solve(int testNumber, FastScanner in, PrintWriter out) {\n- int n = in.nextInt();\n- int[] a = new int[n];\n- for (int i = 0; i < n; i++) {\n- a[i] = in.nextInt();\n- }\n- int k = repaint(a);\n- int[] nextSame = new int[n];\n- int[] nextLarger = new int[n];\n- int[] last = new int[k + 1];\n- Arrays.fill(last, -1);\n- for (int step = 0; step < 2 * n; step++) {\n- int i = -step % n;\n- if (i < 0) {\n- i += n;\n- }\n- nextSame[i] = last[a[i]];\n- nextLarger[i] = last[a[i] + 1];\n- last[a[i]] = i;\n- }\n-\n- int[] tree = new int[n];\n- for (int i = 0; i < n; i++) {\n- add(tree, i, 1);\n- }\n- int first = -1;\n- for (int i = 0; i < n; i++) {\n- if (a[i] == 0) {\n- first = i;\n- break;\n- }\n- }\n- long ans = 0;\n- int x = 0;\n- for (int i = 0; i < n; i++) {\n- int nx;\n- if (i == 0) {\n- nx = first;\n- } else if (sum(tree, nextSame[x], nextSame[x]) > 0) {\n- nx = nextSame[x];\n- } else {\n- nx = nextLarger[x];\n- }\n- if (x <= nx) {\n- ans += sum(tree, x, nx);\n- } else {\n- ans += sum(tree, x, n - 1);\n- ans += sum(tree, 0, nx);\n- }\n- x = nx;\n- add(tree, x, -1);\n- }\n- out.println(ans);\n+ SegmentTree(int nn) {\n+ n = nn;\n+ t = new int[n << 1 << 1];\n+ build(1, 0, n - 1);\n }\n \n- private void add(int[] tree, int pos, int val) {\n- while (pos < tree.length) {\n- tree[pos] += val;\n- pos |= pos + 1;\n+ void build(int node, int s, int e) {\n+ if (s == e) t[node] = 1;\n+ else {\n+ int mid = (s + e) >> 1;\n+ build(node << 1, s, mid);\n+ build(node << 1 | 1, mid + 1, e);\n+ t[node] = t[node << 1] + t[node << 1 | 1];\n }\n }\n \n- private int sum(int[] tree, int l, int r) {\n- return sum(tree, r) - sum(tree, l - 1);\n+ void update(int idx) {\n+ update(1, 0, n - 1, idx);\n }\n \n- private int sum(int[] tree, int r) {\n- int res = 0;\n- while (r >= 0) {\n- res += tree[r];\n- r = (r & (r + 1)) - 1;\n+ void update(int node, int s, int e, int idx) {\n+ if (s == e && s == idx) t[node] = 0;\n+ else if (idx > e || idx < s) return;\n+ else {\n+ int mid = (s + e) >> 1;\n+ update(node << 1, s, mid, idx);\n+ update(node << 1 | 1, mid + 1, e, idx);\n+ t[node] = t[node << 1] + t[node << 1 | 1];\n }\n- return res;\n }\n \n- private int repaint(int[] a) {\n- int[] b = a.clone();\n- randomShuffle(b);\n- Arrays.sort(b);\n- int k = 0;\n- for (int i = 0; i < b.length; i++) {\n- if (i == 0 || b[i] != b[i - 1]) {\n- b[k++] = b[i];\n- }\n- }\n- for (int i = 0; i < a.length; i++) {\n- a[i] = Arrays.binarySearch(b, 0, k, a[i]);\n- }\n- return k;\n+ int query(int s, int e) {\n+ return query(1, 0, n - 1, s, e);\n }\n \n- private void randomShuffle(int[] a) {\n- for (int i = 0; i < a.length; i++) {\n- int j = random.nextInt(i + 1);\n- int t = a[i];\n- a[i] = a[j];\n- a[j] = t;\n+ int query(int node, int s, int e, int l, int r) {\n+ if (s >= l && e <= r) return t[node];\n+ else if (s > r || e < l) return 0;\n+ else {\n+ int mid = (s + e) >> 1;\n+ return query(node << 1, s, mid, l, r) + query(node << 1 | 1, mid + 1, e, l, r);\n }\n }\n }\n \n- static class FastScanner {\n- private BufferedReader in;\n- private StringTokenizer st;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- public FastScanner(InputStream stream) {\n- in = new BufferedReader(new InputStreamReader(stream));\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n \n- public String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- String rl = in.readLine();\n- if (rl == null) {\n- return null;\n- }\n- st = new StringTokenizer(rl);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- }\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n- public int nextInt() {\n+ public int nextInt() throws IOException {\n return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "SLOWER 0.1875", "problem_id": "830_B", "direction": "reversed", "speedup_ratio": 1.1388, "pair_id": "java_12293_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.math.BigInteger;\n import java.util.ArrayList;\n-import java.util.StringTokenizer;\n \n-public class D {\n+public class CF_0397_E {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String[] line;\n \n- static int N, t;\n- static ArrayList[] adjList;\n- static int[] L, inTime, outTime;\n- static final int MOD = (int) 1e9 + 7;\n+ line = br.readLine().split(\" \");\n+ int N = Integer.parseInt(line[0]);\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n+ nexts = new ArrayList[N];\n+ for (int n = 0; n < N; n++) {\n+ nexts[n] = new ArrayList<>();\n+ }\n+ line = br.readLine().split(\" \");\n+ for (int n = 1; n < N; n++) {\n+ int a = Integer.parseInt(line[n - 1]) - 1;\n+ nexts[a].add(n);\n+ }\n \n- N = sc.nextInt();\n- adjList = new ArrayList[N];\n- for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n- for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n+ trav = new int[2 * N - 1];\n+ first = new int[N];\n+ last = new int[N];\n+ depth = new int[N];\n \n- t = 0;\n- L = new int[N];\n- inTime = new int[N];\n- outTime = new int[N];\n- dfs(0, 0);\n+ createTrav(0, 0);\n \n- int n = 1;\n- while (n < N) n <<= 1;\n- int[] in1 = new int[n + 1], in2 = new int[n + 1];\n- SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n+ FenwickTree slope = new FenwickTree(2 * N - 1);\n+ FenwickTree sect = new FenwickTree(2 * N - 1);\n \n- int q = sc.nextInt();\n- while (q-- > 0) {\n- int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n- if (t == 1) {\n- int x = sc.nextInt(), k = sc.nextInt();\n- st1.update_range(l, r, x + (1l * k * L[v]));\n- st2.update_range(l, r, k);\n+ StringBuilder sb = new StringBuilder();\n+ line = br.readLine().split(\" \");\n+ int Q = Integer.parseInt(line[0]);\n+ for (int q = 0; q < Q; q++) {\n+ line = br.readLine().split(\" \");\n+ if (line.length == 4) {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ int X = Integer.parseInt(line[2]);\n+ int K = Integer.parseInt(line[3]);\n+\n+ long qslope = K;\n+ long qsect = X + (depth[V] * (long) K);\n+ qsect %= 1_000_000_007;\n+\n+ slope.modify(first[V], qslope);\n+ slope.modify(last[V] + 1, -qslope);\n+ sect.modify(first[V], qsect);\n+ sect.modify(last[V] + 1, -qsect);\n } else {\n- int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n- int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n- out.println((sum1 - sum2 + MOD) % MOD);\n+ int V = Integer.parseInt(line[1]) - 1;\n+ long qslope = slope.rsq(first[V]);\n+ long qsect = sect.rsq(first[V]);\n+\n+ BigInteger result =\n+ (new BigInteger(\"\" + qsect))\n+ .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n+ result = result.mod(new BigInteger(\"1000000007\"));\n+ sb.append(result.toString()).append('\\n');\n }\n }\n- out.flush();\n- out.close();\n+ System.out.println(sb);\n }\n \n- static void dfs(int u, int l) {\n- inTime[u] = ++t;\n- L[u] = l;\n- for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n- outTime[u] = t;\n+ static ArrayList[] nexts;\n+ static int[] trav;\n+ static int tsize = 0;\n+ static int[] depth;\n+ static int[] first, last;\n+\n+ static void createTrav(int start, int dep) {\n+ trav[tsize] = start;\n+ first[start] = tsize;\n+ last[start] = tsize;\n+ depth[start] = dep;\n+ tsize++;\n+ for (int i = 0; i < nexts[start].size(); i++) {\n+ int next = nexts[start].get(i);\n+ createTrav(next, dep + 1);\n+ trav[tsize] = start;\n+ last[start] = tsize;\n+ tsize++;\n+ }\n }\n \n- static class SegmentTree {\n+ static class FenwickTree {\n+ long[] arr;\n \n- int N;\n- int[] array;\n- long[] sTree, lazy;\n-\n- SegmentTree(int[] in) {\n- array = in;\n- N = in.length - 1;\n- sTree = new long[N << 1];\n- lazy = new long[N << 1];\n+ FenwickTree(int size) {\n+ arr = new long[size + 1];\n }\n \n- void update_range(int i, int j, long val) {\n- update_range(1, 1, N, i, j, val);\n+ long rsq(int chl) {\n+ long sum = 0;\n+ do {\n+ sum += arr[chl];\n+ chl = dep(chl);\n+ } while (chl != -1);\n+ return sum;\n }\n \n- void update_range(int node, int b, int e, int i, int j, long val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- sTree[node] += (e - b + 1) * val % MOD;\n- lazy[node] += val;\n- lazy[node] %= MOD;\n- } else {\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n+ void modify(int chl, long amount) {\n+ while (chl < arr.length) {\n+ arr[chl] += amount;\n+ chl += ((~chl) & (-(~chl)));\n }\n }\n \n- void propagate(int node, int b, int mid, int e) {\n- lazy[node << 1] += lazy[node];\n- lazy[node << 1 | 1] += lazy[node];\n- sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n- sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n- lazy[node] = 0;\n- }\n-\n- long query(int i, int j) {\n- return query(1, 1, N, i, j);\n- }\n-\n- long query(int node, int b, int e, int i, int j) {\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return sTree[node];\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- long q1 = query(node << 1, b, mid, i, j);\n- long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (q1 + q2);\n- }\n- }\n-\n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream system) {\n- br = new BufferedReader(new InputStreamReader(system));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- public char nextChar() throws IOException {\n- return next().charAt(0);\n- }\n-\n- public Long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n-\n- public void waitForInput() {\n- for (long i = 0; i < 3e9; i++)\n- ;\n+ private int dep(int a) {\n+ a++;\n+ return a - (a & (-a)) - 1;\n }\n }\n }", "output": "FASTER 0.103", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.074, "pair_id": "java_2282_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n-import java.math.BigInteger;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class CF_0397_E {\n+public class D {\n+\n+ static int N, t;\n+ static ArrayList[] adjList;\n+ static int[] L, inTime, outTime;\n+ static final int MOD = (int) 1e9 + 7;\n+\n public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String[] line;\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n \n- line = br.readLine().split(\" \");\n- int N = Integer.parseInt(line[0]);\n+ N = sc.nextInt();\n+ adjList = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n+ for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n \n- nexts = new ArrayList[N];\n- for (int n = 0; n < N; n++) {\n- nexts[n] = new ArrayList<>();\n+ t = 0;\n+ L = new int[N];\n+ inTime = new int[N];\n+ outTime = new int[N];\n+ dfs(0, 0);\n+\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ int[] in1 = new int[n + 1], in2 = new int[n + 1];\n+ SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n+\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n+ if (t == 1) {\n+ int x = sc.nextInt(), k = sc.nextInt();\n+ st1.update_range(l, r, x + (1l * k * L[v]));\n+ st2.update_range(l, r, k);\n+ } else {\n+ int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n+ int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n+ out.println((sum1 - sum2 + MOD) % MOD);\n+ }\n }\n- line = br.readLine().split(\" \");\n- for (int n = 1; n < N; n++) {\n- int a = Integer.parseInt(line[n - 1]) - 1;\n- nexts[a].add(n);\n+ out.flush();\n+ out.close();\n+ }\n+\n+ static void dfs(int u, int l) {\n+ inTime[u] = ++t;\n+ L[u] = l;\n+ for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n+ outTime[u] = t;\n+ }\n+\n+ static class SegmentTree {\n+\n+ int N;\n+ int[] array;\n+ long[] sTree, lazy;\n+\n+ SegmentTree(int[] in) {\n+ array = in;\n+ N = in.length - 1;\n+ sTree = new long[N << 1];\n+ lazy = new long[N << 1];\n }\n \n- trav = new int[2 * N - 1];\n- first = new int[N];\n- last = new int[N];\n- depth = new int[N];\n+ void update_range(int i, int j, long val) {\n+ update_range(1, 1, N, i, j, val);\n+ }\n \n- createTrav(0, 0);\n-\n- FenwickTree slope = new FenwickTree(2 * N - 1);\n- FenwickTree sect = new FenwickTree(2 * N - 1);\n-\n- StringBuilder sb = new StringBuilder();\n- line = br.readLine().split(\" \");\n- int Q = Integer.parseInt(line[0]);\n- for (int q = 0; q < Q; q++) {\n- line = br.readLine().split(\" \");\n- if (line.length == 4) {\n- int V = Integer.parseInt(line[1]) - 1;\n- int X = Integer.parseInt(line[2]);\n- int K = Integer.parseInt(line[3]);\n-\n- long qslope = K;\n- long qsect = X + (depth[V] * (long) K);\n- qsect %= 1_000_000_007;\n-\n- slope.modify(first[V], qslope);\n- slope.modify(last[V] + 1, -qslope);\n- sect.modify(first[V], qsect);\n- sect.modify(last[V] + 1, -qsect);\n+ void update_range(int node, int b, int e, int i, int j, long val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ sTree[node] += (e - b + 1) * val % MOD;\n+ lazy[node] += val;\n+ lazy[node] %= MOD;\n } else {\n- int V = Integer.parseInt(line[1]) - 1;\n- long qslope = slope.rsq(first[V]);\n- long qsect = sect.rsq(first[V]);\n-\n- BigInteger result =\n- (new BigInteger(\"\" + qsect))\n- .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n- result = result.mod(new BigInteger(\"1000000007\"));\n- sb.append(result.toString()).append('\\n');\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n- System.out.println(sb);\n- }\n \n- static ArrayList[] nexts;\n- static int[] trav;\n- static int tsize = 0;\n- static int[] depth;\n- static int[] first, last;\n+ void propagate(int node, int b, int mid, int e) {\n+ lazy[node << 1] += lazy[node];\n+ lazy[node << 1 | 1] += lazy[node];\n+ sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n+ sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n+ lazy[node] = 0;\n+ }\n \n- static void createTrav(int start, int dep) {\n- trav[tsize] = start;\n- first[start] = tsize;\n- last[start] = tsize;\n- depth[start] = dep;\n- tsize++;\n- for (int i = 0; i < nexts[start].size(); i++) {\n- int next = nexts[start].get(i);\n- createTrav(next, dep + 1);\n- trav[tsize] = start;\n- last[start] = tsize;\n- tsize++;\n+ long query(int i, int j) {\n+ return query(1, 1, N, i, j);\n+ }\n+\n+ long query(int node, int b, int e, int i, int j) {\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return sTree[node];\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ long q1 = query(node << 1, b, mid, i, j);\n+ long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (q1 + q2);\n }\n }\n \n- static class FenwickTree {\n- long[] arr;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- FenwickTree(int size) {\n- arr = new long[size + 1];\n+ public Scanner(InputStream system) {\n+ br = new BufferedReader(new InputStreamReader(system));\n }\n \n- long rsq(int chl) {\n- long sum = 0;\n- do {\n- sum += arr[chl];\n- chl = dep(chl);\n- } while (chl != -1);\n- return sum;\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n \n- void modify(int chl, long amount) {\n- while (chl < arr.length) {\n- arr[chl] += amount;\n- chl += ((~chl) & (-(~chl)));\n- }\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n }\n \n- private int dep(int a) {\n- a++;\n- return a - (a & (-a)) - 1;\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public char nextChar() throws IOException {\n+ return next().charAt(0);\n+ }\n+\n+ public Long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n+ }\n+\n+ public void waitForInput() {\n+ for (long i = 0; i < 3e9; i++)\n+ ;\n }\n }\n }", "output": "SLOWER 0.103", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.074, "pair_id": "java_2282_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n-import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.StringTokenizer;\n \n-public class D {\n+public class CF_396 {\n \n- static int N, t;\n- static ArrayList[] adjList;\n- static int[] L, inTime, outTime;\n- static final int MOD = (int) 1e9 + 7;\n+ static int[] in, ou, h;\n+ static ArrayList[] tree;\n+ static int time;\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n+ static void dfs(int u, int p) {\n+ in[u] = ++time;\n+ h[u] = h[p] + 1;\n+ for (int v : tree[u]) dfs(v, u);\n+ ou[u] = time;\n+ }\n+\n+ private static final int MOD = (int) (1e9 + 7);\n+\n+ static class SegmentTree {\n+ int[] st, sk;\n+ int N;\n+\n+ SegmentTree(int n) {\n+ N = n;\n+ st = new int[N << 1];\n+ sk = new int[N << 1];\n+ }\n+\n+ void update(int cur, int node, int l, int r, int x, int k) {\n+ if (in[node] > r || ou[node] < l) return;\n+ if (in[node] <= l && ou[node] >= r) {\n+ st[cur] = (st[cur] + x) % MOD;\n+ int toAdd = (int) ((1l * h[node] * k) % MOD);\n+ st[cur] = (st[cur] + toAdd) % MOD;\n+ sk[cur] = (sk[cur] + k) % MOD;\n+ return;\n+ }\n+ int mid = (l + r) >> 1;\n+ update(cur << 1, node, l, mid, x, k);\n+ update((cur << 1) | 1, node, mid + 1, r, x, k);\n+ }\n+\n+ int query(int cur, int node, int l, int r) {\n+ int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n+ int answer = (st[cur] + MOD - toMinus) % MOD;\n+ if (r - l < 1) return answer;\n+ int mid = (l + r) >> 1;\n+ if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n+ return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n+ }\n+ }\n+\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n-\n- N = sc.nextInt();\n- adjList = new ArrayList[N];\n- for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n- for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n-\n- t = 0;\n- L = new int[N];\n- inTime = new int[N];\n- outTime = new int[N];\n- dfs(0, 0);\n-\n+ StringTokenizer st;\n+ int N = Integer.parseInt(br.readLine());\n+ tree = new ArrayList[N + 1];\n+ in = new int[N + 1];\n+ ou = new int[N + 1];\n+ h = new int[N + 1];\n+ for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n+ st = new StringTokenizer(br.readLine());\n+ for (int i = 2; i <= N; ++i) {\n+ int v = Integer.parseInt(st.nextToken());\n+ tree[v].add(i);\n+ }\n+ time = 0;\n+ dfs(1, 0);\n+ int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n- int[] in1 = new int[n + 1], in2 = new int[n + 1];\n- SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n-\n- int q = sc.nextInt();\n- while (q-- > 0) {\n- int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n- if (t == 1) {\n- int x = sc.nextInt(), k = sc.nextInt();\n- st1.update_range(l, r, x + (1l * k * L[v]));\n- st2.update_range(l, r, k);\n+ SegmentTree segTree = new SegmentTree(n);\n+ while (Q-- > 0) {\n+ st = new StringTokenizer(br.readLine());\n+ int t = Integer.parseInt(st.nextToken());\n+ if (t == 2) {\n+ int u = Integer.parseInt(st.nextToken());\n+ out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n- int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n- int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n- out.println((sum1 - sum2 + MOD) % MOD);\n+ int v = Integer.parseInt(st.nextToken()),\n+ x = Integer.parseInt(st.nextToken()),\n+ k = Integer.parseInt(st.nextToken());\n+ segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n-\n- static void dfs(int u, int l) {\n- inTime[u] = ++t;\n- L[u] = l;\n- for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n- outTime[u] = t;\n- }\n-\n- static class SegmentTree {\n-\n- int N;\n- int[] array;\n- long[] sTree, lazy;\n-\n- SegmentTree(int[] in) {\n- array = in;\n- N = in.length - 1;\n- sTree = new long[N << 1];\n- lazy = new long[N << 1];\n- }\n-\n- void update_range(int i, int j, long val) {\n- update_range(1, 1, N, i, j, val);\n- }\n-\n- void update_range(int node, int b, int e, int i, int j, long val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- sTree[node] += (e - b + 1) * val % MOD;\n- lazy[node] += val;\n- lazy[node] %= MOD;\n- } else {\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n- }\n- }\n-\n- void propagate(int node, int b, int mid, int e) {\n- lazy[node << 1] += lazy[node];\n- lazy[node << 1 | 1] += lazy[node];\n- sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n- sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n- lazy[node] = 0;\n- }\n-\n- long query(int i, int j) {\n- return query(1, 1, N, i, j);\n- }\n-\n- long query(int node, int b, int e, int i, int j) {\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return sTree[node];\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- long q1 = query(node << 1, b, mid, i, j);\n- long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (q1 + q2);\n- }\n- }\n-\n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream system) {\n- br = new BufferedReader(new InputStreamReader(system));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- public char nextChar() throws IOException {\n- return next().charAt(0);\n- }\n-\n- public Long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n-\n- public void waitForInput() {\n- for (long i = 0; i < 3e9; i++)\n- ;\n- }\n- }\n }", "output": "FASTER 0.4638", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.3792, "pair_id": "java_2277_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n import java.util.StringTokenizer;\n \n-public class CF_396 {\n+public class D {\n \n- static int[] in, ou, h;\n- static ArrayList[] tree;\n- static int time;\n+ static int N, t;\n+ static ArrayList[] adjList;\n+ static int[] L, inTime, outTime;\n+ static final int MOD = (int) 1e9 + 7;\n \n- static void dfs(int u, int p) {\n- in[u] = ++time;\n- h[u] = h[p] + 1;\n- for (int v : tree[u]) dfs(v, u);\n- ou[u] = time;\n- }\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n \n- private static final int MOD = (int) (1e9 + 7);\n+ N = sc.nextInt();\n+ adjList = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n+ for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n \n- static class SegmentTree {\n- int[] st, sk;\n- int N;\n+ t = 0;\n+ L = new int[N];\n+ inTime = new int[N];\n+ outTime = new int[N];\n+ dfs(0, 0);\n \n- SegmentTree(int n) {\n- N = n;\n- st = new int[N << 1];\n- sk = new int[N << 1];\n- }\n-\n- void update(int cur, int node, int l, int r, int x, int k) {\n- if (in[node] > r || ou[node] < l) return;\n- if (in[node] <= l && ou[node] >= r) {\n- st[cur] = (st[cur] + x) % MOD;\n- int toAdd = (int) ((1l * h[node] * k) % MOD);\n- st[cur] = (st[cur] + toAdd) % MOD;\n- sk[cur] = (sk[cur] + k) % MOD;\n- return;\n- }\n- int mid = (l + r) >> 1;\n- update(cur << 1, node, l, mid, x, k);\n- update((cur << 1) | 1, node, mid + 1, r, x, k);\n- }\n-\n- int query(int cur, int node, int l, int r) {\n- int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n- int answer = (st[cur] + MOD - toMinus) % MOD;\n- if (r - l < 1) return answer;\n- int mid = (l + r) >> 1;\n- if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n- return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n- }\n- }\n-\n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(System.out);\n- StringTokenizer st;\n- int N = Integer.parseInt(br.readLine());\n- tree = new ArrayList[N + 1];\n- in = new int[N + 1];\n- ou = new int[N + 1];\n- h = new int[N + 1];\n- for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n- st = new StringTokenizer(br.readLine());\n- for (int i = 2; i <= N; ++i) {\n- int v = Integer.parseInt(st.nextToken());\n- tree[v].add(i);\n- }\n- time = 0;\n- dfs(1, 0);\n- int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n- SegmentTree segTree = new SegmentTree(n);\n- while (Q-- > 0) {\n- st = new StringTokenizer(br.readLine());\n- int t = Integer.parseInt(st.nextToken());\n- if (t == 2) {\n- int u = Integer.parseInt(st.nextToken());\n- out.println(segTree.query(1, u, 1, segTree.N));\n+ int[] in1 = new int[n + 1], in2 = new int[n + 1];\n+ SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n+\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n+ if (t == 1) {\n+ int x = sc.nextInt(), k = sc.nextInt();\n+ st1.update_range(l, r, x + (1l * k * L[v]));\n+ st2.update_range(l, r, k);\n } else {\n- int v = Integer.parseInt(st.nextToken()),\n- x = Integer.parseInt(st.nextToken()),\n- k = Integer.parseInt(st.nextToken());\n- segTree.update(1, v, 1, segTree.N, x, k);\n+ int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n+ int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n+ out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n+\n+ static void dfs(int u, int l) {\n+ inTime[u] = ++t;\n+ L[u] = l;\n+ for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n+ outTime[u] = t;\n+ }\n+\n+ static class SegmentTree {\n+\n+ int N;\n+ int[] array;\n+ long[] sTree, lazy;\n+\n+ SegmentTree(int[] in) {\n+ array = in;\n+ N = in.length - 1;\n+ sTree = new long[N << 1];\n+ lazy = new long[N << 1];\n+ }\n+\n+ void update_range(int i, int j, long val) {\n+ update_range(1, 1, N, i, j, val);\n+ }\n+\n+ void update_range(int node, int b, int e, int i, int j, long val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ sTree[node] += (e - b + 1) * val % MOD;\n+ lazy[node] += val;\n+ lazy[node] %= MOD;\n+ } else {\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n+ }\n+ }\n+\n+ void propagate(int node, int b, int mid, int e) {\n+ lazy[node << 1] += lazy[node];\n+ lazy[node << 1 | 1] += lazy[node];\n+ sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n+ sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n+ lazy[node] = 0;\n+ }\n+\n+ long query(int i, int j) {\n+ return query(1, 1, N, i, j);\n+ }\n+\n+ long query(int node, int b, int e, int i, int j) {\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return sTree[node];\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ long q1 = query(node << 1, b, mid, i, j);\n+ long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (q1 + q2);\n+ }\n+ }\n+\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n+\n+ public Scanner(InputStream system) {\n+ br = new BufferedReader(new InputStreamReader(system));\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public char nextChar() throws IOException {\n+ return next().charAt(0);\n+ }\n+\n+ public Long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n+ }\n+\n+ public void waitForInput() {\n+ for (long i = 0; i < 3e9; i++)\n+ ;\n+ }\n+ }\n }", "output": "SLOWER 0.4638", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.3792, "pair_id": "java_2277_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class c {\n- static int mod = 1000000007;\n- static int dec = 1;\n- static int[] depths, pre, post;\n+public class CF_396 {\n \n- public static void main(String[] args) throws IOException {\n- input.init(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = input.nextInt();\n- depths = new int[n];\n- pre = new int[n];\n- post = new int[n];\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n- for (int i = 1; i < n; i++) {\n- int p = input.nextInt() - 1;\n- depths[i] = depths[p] + 1;\n- g[p].add(i);\n- }\n- cnt = 0;\n- dfs(0);\n- int q = input.nextInt();\n- IT it = new IT(n);\n- for (int i = 0; i < q; i++) {\n- int type = input.nextInt();\n- if (type == 1) {\n- int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n+ static int[] in, ou, h;\n+ static ArrayList[] tree;\n+ static int time;\n \n- it.add(pre[x], post[x], v, k, depths[x]);\n- } else {\n- int x = input.nextInt() - 1;\n- int temp = x;\n- x = pre[x];\n-\n- long v = it.getVal(x), s = it.getSlope(x);\n-\n- long res = (v - depths[temp] * s) % mod;\n- if (res < 0) res += mod;\n- out.println(res);\n- }\n- }\n- out.close();\n+ static void dfs(int u, int p) {\n+ in[u] = ++time;\n+ h[u] = h[p] + 1;\n+ for (int v : tree[u]) dfs(v, u);\n+ ou[u] = time;\n }\n \n- static ArrayList[] g;\n- static int cnt;\n+ private static final int MOD = (int) (1e9 + 7);\n \n- static void dfs(int at) {\n- pre[at] = cnt++;\n- for (int x : g[at]) dfs(x);\n- post[at] = cnt - 1;\n- }\n+ static class SegmentTree {\n+ int[] st, sk;\n+ int N;\n \n- static class IT {\n- int[] left, right, val, a, b, prop, slope, pslope;\n-\n- IT(int n) {\n- left = new int[4 * n];\n- right = new int[4 * n];\n- val = new int[4 * n];\n- slope = new int[4 * n];\n- prop = new int[4 * n];\n- pslope = new int[4 * n];\n- a = new int[4 * n];\n- b = new int[4 * n];\n- init(0, 0, n - 1);\n+ SegmentTree(int n) {\n+ N = n;\n+ st = new int[N << 1];\n+ sk = new int[N << 1];\n }\n \n- int init(int at, int l, int r) {\n- a[at] = l;\n- b[at] = r;\n- if (l == r) left[at] = right[at] = -1;\n- else {\n- int mid = (l + r) / 2;\n- left[at] = init(2 * at + 1, l, mid);\n- right[at] = init(2 * at + 2, mid + 1, r);\n+ void update(int cur, int node, int l, int r, int x, int k) {\n+ if (in[node] > r || ou[node] < l) return;\n+ if (in[node] <= l && ou[node] >= r) {\n+ st[cur] = (st[cur] + x) % MOD;\n+ int toAdd = (int) ((1l * h[node] * k) % MOD);\n+ st[cur] = (st[cur] + toAdd) % MOD;\n+ sk[cur] = (sk[cur] + k) % MOD;\n+ return;\n }\n- return at++;\n+ int mid = (l + r) >> 1;\n+ update(cur << 1, node, l, mid, x, k);\n+ update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n \n- int getVal(int x) {\n- return go(x, x, 0);\n- }\n-\n- int getSlope(int x) {\n- return go2(x, x, 0);\n- }\n-\n- void push(int at) {\n- if (prop[at] != 0 || pslope[at] != 0) {\n- go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n- go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n- prop[at] = 0;\n- pslope[at] = 0;\n- }\n- }\n-\n- int go(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return val[at];\n- push(at);\n- return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n- }\n-\n- int go2(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return slope[at];\n- push(at);\n- return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n- }\n-\n- void add(int x, int y, int v, int k, int curDepth) {\n- go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n- }\n-\n- void go3(int x, int y, int v, int v2, int at) {\n- if (at == -1) return;\n- if (y < a[at] || x > b[at]) return;\n- x = Math.max(x, a[at]);\n- y = Math.min(y, b[at]);\n- if (y == b[at] && x == a[at]) {\n- val[at] = (val[at] + v) % mod;\n- prop[at] = (prop[at] + v) % mod;\n- slope[at] = (slope[at] + v2) % mod;\n- pslope[at] = (pslope[at] + v2) % mod;\n- return;\n- }\n- push(at);\n- go3(x, y, v, v2, left[at]);\n- go3(x, y, v, v2, right[at]);\n+ int query(int cur, int node, int l, int r) {\n+ int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n+ int answer = (st[cur] + MOD - toMinus) % MOD;\n+ if (r - l < 1) return answer;\n+ int mid = (l + r) >> 1;\n+ if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n+ return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n \n- public static class input {\n- static BufferedReader reader;\n- static StringTokenizer tokenizer;\n-\n- static void init(InputStream input) {\n- reader = new BufferedReader(new InputStreamReader(input));\n- tokenizer = new StringTokenizer(\"\");\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(System.out);\n+ StringTokenizer st;\n+ int N = Integer.parseInt(br.readLine());\n+ tree = new ArrayList[N + 1];\n+ in = new int[N + 1];\n+ ou = new int[N + 1];\n+ h = new int[N + 1];\n+ for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n+ st = new StringTokenizer(br.readLine());\n+ for (int i = 2; i <= N; ++i) {\n+ int v = Integer.parseInt(st.nextToken());\n+ tree[v].add(i);\n }\n-\n- static String next() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n-\n- tokenizer = new StringTokenizer(reader.readLine());\n+ time = 0;\n+ dfs(1, 0);\n+ int Q = Integer.parseInt(br.readLine());\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ SegmentTree segTree = new SegmentTree(n);\n+ while (Q-- > 0) {\n+ st = new StringTokenizer(br.readLine());\n+ int t = Integer.parseInt(st.nextToken());\n+ if (t == 2) {\n+ int u = Integer.parseInt(st.nextToken());\n+ out.println(segTree.query(1, u, 1, segTree.N));\n+ } else {\n+ int v = Integer.parseInt(st.nextToken()),\n+ x = Integer.parseInt(st.nextToken()),\n+ k = Integer.parseInt(st.nextToken());\n+ segTree.update(1, v, 1, segTree.N, x, k);\n }\n- return tokenizer.nextToken();\n }\n-\n- static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n+ out.flush();\n+ out.close();\n }\n }", "output": "FASTER 0.4445", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.3608, "pair_id": "java_2276_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class CF_396 {\n+public class c {\n+ static int mod = 1000000007;\n+ static int dec = 1;\n+ static int[] depths, pre, post;\n \n- static int[] in, ou, h;\n- static ArrayList[] tree;\n- static int time;\n+ public static void main(String[] args) throws IOException {\n+ input.init(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = input.nextInt();\n+ depths = new int[n];\n+ pre = new int[n];\n+ post = new int[n];\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+ for (int i = 1; i < n; i++) {\n+ int p = input.nextInt() - 1;\n+ depths[i] = depths[p] + 1;\n+ g[p].add(i);\n+ }\n+ cnt = 0;\n+ dfs(0);\n+ int q = input.nextInt();\n+ IT it = new IT(n);\n+ for (int i = 0; i < q; i++) {\n+ int type = input.nextInt();\n+ if (type == 1) {\n+ int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n \n- static void dfs(int u, int p) {\n- in[u] = ++time;\n- h[u] = h[p] + 1;\n- for (int v : tree[u]) dfs(v, u);\n- ou[u] = time;\n+ it.add(pre[x], post[x], v, k, depths[x]);\n+ } else {\n+ int x = input.nextInt() - 1;\n+ int temp = x;\n+ x = pre[x];\n+\n+ long v = it.getVal(x), s = it.getSlope(x);\n+\n+ long res = (v - depths[temp] * s) % mod;\n+ if (res < 0) res += mod;\n+ out.println(res);\n+ }\n+ }\n+ out.close();\n }\n \n- private static final int MOD = (int) (1e9 + 7);\n+ static ArrayList[] g;\n+ static int cnt;\n \n- static class SegmentTree {\n- int[] st, sk;\n- int N;\n+ static void dfs(int at) {\n+ pre[at] = cnt++;\n+ for (int x : g[at]) dfs(x);\n+ post[at] = cnt - 1;\n+ }\n \n- SegmentTree(int n) {\n- N = n;\n- st = new int[N << 1];\n- sk = new int[N << 1];\n+ static class IT {\n+ int[] left, right, val, a, b, prop, slope, pslope;\n+\n+ IT(int n) {\n+ left = new int[4 * n];\n+ right = new int[4 * n];\n+ val = new int[4 * n];\n+ slope = new int[4 * n];\n+ prop = new int[4 * n];\n+ pslope = new int[4 * n];\n+ a = new int[4 * n];\n+ b = new int[4 * n];\n+ init(0, 0, n - 1);\n }\n \n- void update(int cur, int node, int l, int r, int x, int k) {\n- if (in[node] > r || ou[node] < l) return;\n- if (in[node] <= l && ou[node] >= r) {\n- st[cur] = (st[cur] + x) % MOD;\n- int toAdd = (int) ((1l * h[node] * k) % MOD);\n- st[cur] = (st[cur] + toAdd) % MOD;\n- sk[cur] = (sk[cur] + k) % MOD;\n+ int init(int at, int l, int r) {\n+ a[at] = l;\n+ b[at] = r;\n+ if (l == r) left[at] = right[at] = -1;\n+ else {\n+ int mid = (l + r) / 2;\n+ left[at] = init(2 * at + 1, l, mid);\n+ right[at] = init(2 * at + 2, mid + 1, r);\n+ }\n+ return at++;\n+ }\n+\n+ int getVal(int x) {\n+ return go(x, x, 0);\n+ }\n+\n+ int getSlope(int x) {\n+ return go2(x, x, 0);\n+ }\n+\n+ void push(int at) {\n+ if (prop[at] != 0 || pslope[at] != 0) {\n+ go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n+ go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n+ prop[at] = 0;\n+ pslope[at] = 0;\n+ }\n+ }\n+\n+ int go(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return val[at];\n+ push(at);\n+ return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n+ }\n+\n+ int go2(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return slope[at];\n+ push(at);\n+ return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n+ }\n+\n+ void add(int x, int y, int v, int k, int curDepth) {\n+ go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n+ }\n+\n+ void go3(int x, int y, int v, int v2, int at) {\n+ if (at == -1) return;\n+ if (y < a[at] || x > b[at]) return;\n+ x = Math.max(x, a[at]);\n+ y = Math.min(y, b[at]);\n+ if (y == b[at] && x == a[at]) {\n+ val[at] = (val[at] + v) % mod;\n+ prop[at] = (prop[at] + v) % mod;\n+ slope[at] = (slope[at] + v2) % mod;\n+ pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n- int mid = (l + r) >> 1;\n- update(cur << 1, node, l, mid, x, k);\n- update((cur << 1) | 1, node, mid + 1, r, x, k);\n- }\n-\n- int query(int cur, int node, int l, int r) {\n- int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n- int answer = (st[cur] + MOD - toMinus) % MOD;\n- if (r - l < 1) return answer;\n- int mid = (l + r) >> 1;\n- if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n- return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n+ push(at);\n+ go3(x, y, v, v2, left[at]);\n+ go3(x, y, v, v2, right[at]);\n }\n }\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(System.out);\n- StringTokenizer st;\n- int N = Integer.parseInt(br.readLine());\n- tree = new ArrayList[N + 1];\n- in = new int[N + 1];\n- ou = new int[N + 1];\n- h = new int[N + 1];\n- for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n- st = new StringTokenizer(br.readLine());\n- for (int i = 2; i <= N; ++i) {\n- int v = Integer.parseInt(st.nextToken());\n- tree[v].add(i);\n+ public static class input {\n+ static BufferedReader reader;\n+ static StringTokenizer tokenizer;\n+\n+ static void init(InputStream input) {\n+ reader = new BufferedReader(new InputStreamReader(input));\n+ tokenizer = new StringTokenizer(\"\");\n }\n- time = 0;\n- dfs(1, 0);\n- int Q = Integer.parseInt(br.readLine());\n- int n = 1;\n- while (n < N) n <<= 1;\n- SegmentTree segTree = new SegmentTree(n);\n- while (Q-- > 0) {\n- st = new StringTokenizer(br.readLine());\n- int t = Integer.parseInt(st.nextToken());\n- if (t == 2) {\n- int u = Integer.parseInt(st.nextToken());\n- out.println(segTree.query(1, u, 1, segTree.N));\n- } else {\n- int v = Integer.parseInt(st.nextToken()),\n- x = Integer.parseInt(st.nextToken()),\n- k = Integer.parseInt(st.nextToken());\n- segTree.update(1, v, 1, segTree.N, x, k);\n+\n+ static String next() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+\n+ tokenizer = new StringTokenizer(reader.readLine());\n }\n+ return tokenizer.nextToken();\n }\n- out.flush();\n- out.close();\n+\n+ static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n }\n }", "output": "SLOWER 0.4445", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.3608, "pair_id": "java_2276_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n+import java.text.*;\n import java.util.*;\n \n-public class c {\n- static int mod = 1000000007;\n- static int dec = 1;\n- static int[] depths, pre, post;\n+public class E397 {\n+\n+ static ArrayList[] adjList;\n+ static int[] s, e, l;\n+ static int t = 0;\n+\n+ public static void findIntervals(int u, int p) {\n+ s[u] = t;\n+ for (int x : adjList[u]) {\n+ if (x != p) {\n+ t++;\n+ l[x] = l[u] + 1;\n+ findIntervals(x, u);\n+ }\n+ }\n+ e[u] = t;\n+ }\n+\n+ static int mod = (int) 1e9 + 7;\n \n public static void main(String[] args) throws IOException {\n- input.init(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = input.nextInt();\n- depths = new int[n];\n- pre = new int[n];\n- post = new int[n];\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n- for (int i = 1; i < n; i++) {\n- int p = input.nextInt() - 1;\n- depths[i] = depths[p] + 1;\n- g[p].add(i);\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ adjList = new ArrayList[n];\n+ for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n+ for (int i = 1; i <= n - 1; i++) {\n+ int p = sc.nextInt() - 1;\n+ adjList[i].add(p);\n+ adjList[p].add(i);\n }\n- cnt = 0;\n- dfs(0);\n- int q = input.nextInt();\n- IT it = new IT(n);\n- for (int i = 0; i < q; i++) {\n- int type = input.nextInt();\n- if (type == 1) {\n- int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n+ s = new int[n];\n+ e = new int[n];\n+ l = new int[n];\n+ findIntervals(0, -1);\n+ int N = 1;\n+ while (N < n) N <<= 1;\n \n- it.add(pre[x], post[x], v, k, depths[x]);\n+ SegmentTree st1 = new SegmentTree(N);\n+ SegmentTree st2 = new SegmentTree(N);\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ if (sc.nextInt() == 1) {\n+ int v = sc.nextInt() - 1;\n+ int x = sc.nextInt();\n+ int k = sc.nextInt();\n+ st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n+ st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n- int x = input.nextInt() - 1;\n- int temp = x;\n- x = pre[x];\n-\n- long v = it.getVal(x), s = it.getSlope(x);\n-\n- long res = (v - depths[temp] * s) % mod;\n- if (res < 0) res += mod;\n- out.println(res);\n- }\n- }\n- out.close();\n- }\n-\n- static ArrayList[] g;\n- static int cnt;\n-\n- static void dfs(int at) {\n- pre[at] = cnt++;\n- for (int x : g[at]) dfs(x);\n- post[at] = cnt - 1;\n- }\n-\n- static class IT {\n- int[] left, right, val, a, b, prop, slope, pslope;\n-\n- IT(int n) {\n- left = new int[4 * n];\n- right = new int[4 * n];\n- val = new int[4 * n];\n- slope = new int[4 * n];\n- prop = new int[4 * n];\n- pslope = new int[4 * n];\n- a = new int[4 * n];\n- b = new int[4 * n];\n- init(0, 0, n - 1);\n- }\n-\n- int init(int at, int l, int r) {\n- a[at] = l;\n- b[at] = r;\n- if (l == r) left[at] = right[at] = -1;\n- else {\n- int mid = (l + r) / 2;\n- left[at] = init(2 * at + 1, l, mid);\n- right[at] = init(2 * at + 2, mid + 1, r);\n- }\n- return at++;\n- }\n-\n- int getVal(int x) {\n- return go(x, x, 0);\n- }\n-\n- int getSlope(int x) {\n- return go2(x, x, 0);\n- }\n-\n- void push(int at) {\n- if (prop[at] != 0 || pslope[at] != 0) {\n- go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n- go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n- prop[at] = 0;\n- pslope[at] = 0;\n+ int v = sc.nextInt() - 1;\n+ long x =\n+ 1l * st1.query(s[v] + 1, s[v] + 1)\n+ - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n+ while (x < 0) x += mod;\n+ x %= mod;\n+ pw.println(x);\n }\n }\n \n- int go(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return val[at];\n- push(at);\n- return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n+ pw.close();\n+ }\n+\n+ static class SegmentTree {\n+\n+ int N;\n+ int[] sTree, lazy;\n+\n+ SegmentTree(int N) {\n+ this.N = N;\n+ sTree = new int[N << 1];\n+ lazy = new int[N << 1];\n }\n \n- int go2(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return slope[at];\n- push(at);\n- return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n+ void update_range(int i, int j, int val) {\n+ update_range(1, 1, N, i, j, val);\n }\n \n- void add(int x, int y, int v, int k, int curDepth) {\n- go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n+ void update_range(int node, int b, int e, int i, int j, int val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ lazy[node] += val;\n+ lazy[node] %= mod;\n+ } else {\n+ int mid = b + e >> 1;\n+\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ }\n }\n \n- void go3(int x, int y, int v, int v2, int at) {\n- if (at == -1) return;\n- if (y < a[at] || x > b[at]) return;\n- x = Math.max(x, a[at]);\n- y = Math.min(y, b[at]);\n- if (y == b[at] && x == a[at]) {\n- val[at] = (val[at] + v) % mod;\n- prop[at] = (prop[at] + v) % mod;\n- slope[at] = (slope[at] + v2) % mod;\n- pslope[at] = (pslope[at] + v2) % mod;\n- return;\n- }\n- push(at);\n- go3(x, y, v, v2, left[at]);\n- go3(x, y, v, v2, right[at]);\n+ int query(int i, int j) {\n+ return query(1, 1, N, i, j);\n+ }\n+\n+ int query(int node, int b, int e, int i, int j) {\n+\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return lazy[node];\n+ int mid = b + e >> 1;\n+\n+ int q1 = query(node << 1, b, mid, i, j);\n+ int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n \n- public static class input {\n- static BufferedReader reader;\n- static StringTokenizer tokenizer;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- static void init(InputStream input) {\n- reader = new BufferedReader(new InputStreamReader(input));\n- tokenizer = new StringTokenizer(\"\");\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n \n- static String next() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n-\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n+ public Scanner(FileReader r) {\n+ br = new BufferedReader(r);\n }\n \n- static int nextInt() throws IOException {\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n \n- static long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "FASTER 0.2819", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.2158, "pair_id": "java_2279_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n-import java.text.*;\n import java.util.*;\n \n-public class E397 {\n+public class c {\n+ static int mod = 1000000007;\n+ static int dec = 1;\n+ static int[] depths, pre, post;\n \n- static ArrayList[] adjList;\n- static int[] s, e, l;\n- static int t = 0;\n+ public static void main(String[] args) throws IOException {\n+ input.init(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = input.nextInt();\n+ depths = new int[n];\n+ pre = new int[n];\n+ post = new int[n];\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+ for (int i = 1; i < n; i++) {\n+ int p = input.nextInt() - 1;\n+ depths[i] = depths[p] + 1;\n+ g[p].add(i);\n+ }\n+ cnt = 0;\n+ dfs(0);\n+ int q = input.nextInt();\n+ IT it = new IT(n);\n+ for (int i = 0; i < q; i++) {\n+ int type = input.nextInt();\n+ if (type == 1) {\n+ int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n \n- public static void findIntervals(int u, int p) {\n- s[u] = t;\n- for (int x : adjList[u]) {\n- if (x != p) {\n- t++;\n- l[x] = l[u] + 1;\n- findIntervals(x, u);\n+ it.add(pre[x], post[x], v, k, depths[x]);\n+ } else {\n+ int x = input.nextInt() - 1;\n+ int temp = x;\n+ x = pre[x];\n+\n+ long v = it.getVal(x), s = it.getSlope(x);\n+\n+ long res = (v - depths[temp] * s) % mod;\n+ if (res < 0) res += mod;\n+ out.println(res);\n }\n }\n- e[u] = t;\n+ out.close();\n }\n \n- static int mod = (int) 1e9 + 7;\n+ static ArrayList[] g;\n+ static int cnt;\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- adjList = new ArrayList[n];\n- for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n- for (int i = 1; i <= n - 1; i++) {\n- int p = sc.nextInt() - 1;\n- adjList[i].add(p);\n- adjList[p].add(i);\n+ static void dfs(int at) {\n+ pre[at] = cnt++;\n+ for (int x : g[at]) dfs(x);\n+ post[at] = cnt - 1;\n+ }\n+\n+ static class IT {\n+ int[] left, right, val, a, b, prop, slope, pslope;\n+\n+ IT(int n) {\n+ left = new int[4 * n];\n+ right = new int[4 * n];\n+ val = new int[4 * n];\n+ slope = new int[4 * n];\n+ prop = new int[4 * n];\n+ pslope = new int[4 * n];\n+ a = new int[4 * n];\n+ b = new int[4 * n];\n+ init(0, 0, n - 1);\n }\n- s = new int[n];\n- e = new int[n];\n- l = new int[n];\n- findIntervals(0, -1);\n- int N = 1;\n- while (N < n) N <<= 1;\n \n- SegmentTree st1 = new SegmentTree(N);\n- SegmentTree st2 = new SegmentTree(N);\n- int q = sc.nextInt();\n- while (q-- > 0) {\n- if (sc.nextInt() == 1) {\n- int v = sc.nextInt() - 1;\n- int x = sc.nextInt();\n- int k = sc.nextInt();\n- st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n- st2.update_range(s[v] + 1, e[v] + 1, k);\n- } else {\n- int v = sc.nextInt() - 1;\n- long x =\n- 1l * st1.query(s[v] + 1, s[v] + 1)\n- - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n- while (x < 0) x += mod;\n- x %= mod;\n- pw.println(x);\n+ int init(int at, int l, int r) {\n+ a[at] = l;\n+ b[at] = r;\n+ if (l == r) left[at] = right[at] = -1;\n+ else {\n+ int mid = (l + r) / 2;\n+ left[at] = init(2 * at + 1, l, mid);\n+ right[at] = init(2 * at + 2, mid + 1, r);\n+ }\n+ return at++;\n+ }\n+\n+ int getVal(int x) {\n+ return go(x, x, 0);\n+ }\n+\n+ int getSlope(int x) {\n+ return go2(x, x, 0);\n+ }\n+\n+ void push(int at) {\n+ if (prop[at] != 0 || pslope[at] != 0) {\n+ go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n+ go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n+ prop[at] = 0;\n+ pslope[at] = 0;\n }\n }\n \n- pw.close();\n- }\n-\n- static class SegmentTree {\n-\n- int N;\n- int[] sTree, lazy;\n-\n- SegmentTree(int N) {\n- this.N = N;\n- sTree = new int[N << 1];\n- lazy = new int[N << 1];\n+ int go(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return val[at];\n+ push(at);\n+ return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n \n- void update_range(int i, int j, int val) {\n- update_range(1, 1, N, i, j, val);\n+ int go2(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return slope[at];\n+ push(at);\n+ return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n \n- void update_range(int node, int b, int e, int i, int j, int val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- lazy[node] += val;\n- lazy[node] %= mod;\n- } else {\n- int mid = b + e >> 1;\n-\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- }\n+ void add(int x, int y, int v, int k, int curDepth) {\n+ go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n \n- int query(int i, int j) {\n- return query(1, 1, N, i, j);\n- }\n-\n- int query(int node, int b, int e, int i, int j) {\n-\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return lazy[node];\n- int mid = b + e >> 1;\n-\n- int q1 = query(node << 1, b, mid, i, j);\n- int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (((q1 + q2) % mod) + lazy[node]) % mod;\n+ void go3(int x, int y, int v, int v2, int at) {\n+ if (at == -1) return;\n+ if (y < a[at] || x > b[at]) return;\n+ x = Math.max(x, a[at]);\n+ y = Math.min(y, b[at]);\n+ if (y == b[at] && x == a[at]) {\n+ val[at] = (val[at] + v) % mod;\n+ prop[at] = (prop[at] + v) % mod;\n+ slope[at] = (slope[at] + v2) % mod;\n+ pslope[at] = (pslope[at] + v2) % mod;\n+ return;\n+ }\n+ push(at);\n+ go3(x, y, v, v2, left[at]);\n+ go3(x, y, v, v2, right[at]);\n }\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n+ public static class input {\n+ static BufferedReader reader;\n+ static StringTokenizer tokenizer;\n \n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n+ static void init(InputStream input) {\n+ reader = new BufferedReader(new InputStreamReader(input));\n+ tokenizer = new StringTokenizer(\"\");\n }\n \n- public Scanner(FileReader r) {\n- br = new BufferedReader(r);\n+ static String next() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n+ static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n }\n \n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 0.2819", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.2158, "pair_id": "java_2279_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.util.*;\n \n-public class D {\n-\n- static int N, t;\n- static ArrayList[] adjList;\n- static int[] L, inTime, outTime;\n- static final int MOD = (int) 1e9 + 7;\n+public class c {\n+ static int mod = 1000000007;\n+ static int dec = 1;\n+ static int[] depths, pre, post;\n \n public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n+ input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n+ int n = input.nextInt();\n+ depths = new int[n];\n+ pre = new int[n];\n+ post = new int[n];\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+ for (int i = 1; i < n; i++) {\n+ int p = input.nextInt() - 1;\n+ depths[i] = depths[p] + 1;\n+ g[p].add(i);\n+ }\n+ cnt = 0;\n+ dfs(0);\n+ int q = input.nextInt();\n+ IT it = new IT(n);\n+ for (int i = 0; i < q; i++) {\n+ int type = input.nextInt();\n+ if (type == 1) {\n+ int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n \n- N = sc.nextInt();\n- adjList = new ArrayList[N];\n- for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n- for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n+ it.add(pre[x], post[x], v, k, depths[x]);\n+ } else {\n+ int x = input.nextInt() - 1;\n+ int temp = x;\n+ x = pre[x];\n \n- t = 0;\n- L = new int[N];\n- inTime = new int[N];\n- outTime = new int[N];\n- dfs(0, 0);\n+ long v = it.getVal(x), s = it.getSlope(x);\n \n- int n = 1;\n- while (n < N) n <<= 1;\n- int[] in1 = new int[n + 1], in2 = new int[n + 1];\n- SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n-\n- int q = sc.nextInt();\n- while (q-- > 0) {\n- int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n- if (t == 1) {\n- int x = sc.nextInt(), k = sc.nextInt();\n- st1.update_range(l, r, x + (1l * k * L[v]));\n- st2.update_range(l, r, k);\n- } else {\n- int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n- int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n- out.println((sum1 - sum2 + MOD) % MOD);\n+ long res = (v - depths[temp] * s) % mod;\n+ if (res < 0) res += mod;\n+ out.println(res);\n }\n }\n- out.flush();\n out.close();\n }\n \n- static void dfs(int u, int l) {\n- inTime[u] = ++t;\n- L[u] = l;\n- for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n- outTime[u] = t;\n+ static ArrayList[] g;\n+ static int cnt;\n+\n+ static void dfs(int at) {\n+ pre[at] = cnt++;\n+ for (int x : g[at]) dfs(x);\n+ post[at] = cnt - 1;\n }\n \n- static class SegmentTree {\n+ static class IT {\n+ int[] left, right, val, a, b, prop, slope, pslope;\n \n- int N;\n- int[] array;\n- long[] sTree, lazy;\n-\n- SegmentTree(int[] in) {\n- array = in;\n- N = in.length - 1;\n- sTree = new long[N << 1];\n- lazy = new long[N << 1];\n+ IT(int n) {\n+ left = new int[4 * n];\n+ right = new int[4 * n];\n+ val = new int[4 * n];\n+ slope = new int[4 * n];\n+ prop = new int[4 * n];\n+ pslope = new int[4 * n];\n+ a = new int[4 * n];\n+ b = new int[4 * n];\n+ init(0, 0, n - 1);\n }\n \n- void update_range(int i, int j, long val) {\n- update_range(1, 1, N, i, j, val);\n+ int init(int at, int l, int r) {\n+ a[at] = l;\n+ b[at] = r;\n+ if (l == r) left[at] = right[at] = -1;\n+ else {\n+ int mid = (l + r) / 2;\n+ left[at] = init(2 * at + 1, l, mid);\n+ right[at] = init(2 * at + 2, mid + 1, r);\n+ }\n+ return at++;\n }\n \n- void update_range(int node, int b, int e, int i, int j, long val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- sTree[node] += (e - b + 1) * val % MOD;\n- lazy[node] += val;\n- lazy[node] %= MOD;\n- } else {\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n+ int getVal(int x) {\n+ return go(x, x, 0);\n+ }\n+\n+ int getSlope(int x) {\n+ return go2(x, x, 0);\n+ }\n+\n+ void push(int at) {\n+ if (prop[at] != 0 || pslope[at] != 0) {\n+ go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n+ go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n+ prop[at] = 0;\n+ pslope[at] = 0;\n }\n }\n \n- void propagate(int node, int b, int mid, int e) {\n- lazy[node << 1] += lazy[node];\n- lazy[node << 1 | 1] += lazy[node];\n- sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n- sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n- lazy[node] = 0;\n+ int go(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return val[at];\n+ push(at);\n+ return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n \n- long query(int i, int j) {\n- return query(1, 1, N, i, j);\n+ int go2(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return slope[at];\n+ push(at);\n+ return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n \n- long query(int node, int b, int e, int i, int j) {\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return sTree[node];\n- int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- long q1 = query(node << 1, b, mid, i, j);\n- long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (q1 + q2);\n+ void add(int x, int y, int v, int k, int curDepth) {\n+ go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n+ }\n+\n+ void go3(int x, int y, int v, int v2, int at) {\n+ if (at == -1) return;\n+ if (y < a[at] || x > b[at]) return;\n+ x = Math.max(x, a[at]);\n+ y = Math.min(y, b[at]);\n+ if (y == b[at] && x == a[at]) {\n+ val[at] = (val[at] + v) % mod;\n+ prop[at] = (prop[at] + v) % mod;\n+ slope[at] = (slope[at] + v2) % mod;\n+ pslope[at] = (pslope[at] + v2) % mod;\n+ return;\n+ }\n+ push(at);\n+ go3(x, y, v, v2, left[at]);\n+ go3(x, y, v, v2, right[at]);\n }\n }\n \n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n+ public static class input {\n+ static BufferedReader reader;\n+ static StringTokenizer tokenizer;\n \n- public Scanner(InputStream system) {\n- br = new BufferedReader(new InputStreamReader(system));\n+ static void init(InputStream input) {\n+ reader = new BufferedReader(new InputStreamReader(input));\n+ tokenizer = new StringTokenizer(\"\");\n }\n \n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n+ static String next() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public int nextInt() throws IOException {\n+ static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- public double nextDouble() throws IOException {\n+ static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n \n- public char nextChar() throws IOException {\n- return next().charAt(0);\n- }\n-\n- public Long nextLong() throws IOException {\n+ static long nextLong() throws IOException {\n return Long.parseLong(next());\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n-\n- public void waitForInput() {\n- for (long i = 0; i < 3e9; i++)\n- ;\n }\n }\n }", "output": "FASTER 0.0193", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.0135, "pair_id": "java_2283_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class c {\n- static int mod = 1000000007;\n- static int dec = 1;\n- static int[] depths, pre, post;\n+public class D {\n+\n+ static int N, t;\n+ static ArrayList[] adjList;\n+ static int[] L, inTime, outTime;\n+ static final int MOD = (int) 1e9 + 7;\n \n public static void main(String[] args) throws IOException {\n- input.init(System.in);\n+ Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n- int n = input.nextInt();\n- depths = new int[n];\n- pre = new int[n];\n- post = new int[n];\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n- for (int i = 1; i < n; i++) {\n- int p = input.nextInt() - 1;\n- depths[i] = depths[p] + 1;\n- g[p].add(i);\n- }\n- cnt = 0;\n- dfs(0);\n- int q = input.nextInt();\n- IT it = new IT(n);\n- for (int i = 0; i < q; i++) {\n- int type = input.nextInt();\n- if (type == 1) {\n- int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n \n- it.add(pre[x], post[x], v, k, depths[x]);\n+ N = sc.nextInt();\n+ adjList = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n+ for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n+\n+ t = 0;\n+ L = new int[N];\n+ inTime = new int[N];\n+ outTime = new int[N];\n+ dfs(0, 0);\n+\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ int[] in1 = new int[n + 1], in2 = new int[n + 1];\n+ SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n+\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n+ if (t == 1) {\n+ int x = sc.nextInt(), k = sc.nextInt();\n+ st1.update_range(l, r, x + (1l * k * L[v]));\n+ st2.update_range(l, r, k);\n } else {\n- int x = input.nextInt() - 1;\n- int temp = x;\n- x = pre[x];\n-\n- long v = it.getVal(x), s = it.getSlope(x);\n-\n- long res = (v - depths[temp] * s) % mod;\n- if (res < 0) res += mod;\n- out.println(res);\n+ int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n+ int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n+ out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n+ out.flush();\n out.close();\n }\n \n- static ArrayList[] g;\n- static int cnt;\n-\n- static void dfs(int at) {\n- pre[at] = cnt++;\n- for (int x : g[at]) dfs(x);\n- post[at] = cnt - 1;\n+ static void dfs(int u, int l) {\n+ inTime[u] = ++t;\n+ L[u] = l;\n+ for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n+ outTime[u] = t;\n }\n \n- static class IT {\n- int[] left, right, val, a, b, prop, slope, pslope;\n+ static class SegmentTree {\n \n- IT(int n) {\n- left = new int[4 * n];\n- right = new int[4 * n];\n- val = new int[4 * n];\n- slope = new int[4 * n];\n- prop = new int[4 * n];\n- pslope = new int[4 * n];\n- a = new int[4 * n];\n- b = new int[4 * n];\n- init(0, 0, n - 1);\n+ int N;\n+ int[] array;\n+ long[] sTree, lazy;\n+\n+ SegmentTree(int[] in) {\n+ array = in;\n+ N = in.length - 1;\n+ sTree = new long[N << 1];\n+ lazy = new long[N << 1];\n }\n \n- int init(int at, int l, int r) {\n- a[at] = l;\n- b[at] = r;\n- if (l == r) left[at] = right[at] = -1;\n- else {\n- int mid = (l + r) / 2;\n- left[at] = init(2 * at + 1, l, mid);\n- right[at] = init(2 * at + 2, mid + 1, r);\n- }\n- return at++;\n+ void update_range(int i, int j, long val) {\n+ update_range(1, 1, N, i, j, val);\n }\n \n- int getVal(int x) {\n- return go(x, x, 0);\n- }\n-\n- int getSlope(int x) {\n- return go2(x, x, 0);\n- }\n-\n- void push(int at) {\n- if (prop[at] != 0 || pslope[at] != 0) {\n- go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n- go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n- prop[at] = 0;\n- pslope[at] = 0;\n+ void update_range(int node, int b, int e, int i, int j, long val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ sTree[node] += (e - b + 1) * val % MOD;\n+ lazy[node] += val;\n+ lazy[node] %= MOD;\n+ } else {\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n \n- int go(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return val[at];\n- push(at);\n- return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n+ void propagate(int node, int b, int mid, int e) {\n+ lazy[node << 1] += lazy[node];\n+ lazy[node << 1 | 1] += lazy[node];\n+ sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n+ sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n+ lazy[node] = 0;\n }\n \n- int go2(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return slope[at];\n- push(at);\n- return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n+ long query(int i, int j) {\n+ return query(1, 1, N, i, j);\n }\n \n- void add(int x, int y, int v, int k, int curDepth) {\n- go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n- }\n-\n- void go3(int x, int y, int v, int v2, int at) {\n- if (at == -1) return;\n- if (y < a[at] || x > b[at]) return;\n- x = Math.max(x, a[at]);\n- y = Math.min(y, b[at]);\n- if (y == b[at] && x == a[at]) {\n- val[at] = (val[at] + v) % mod;\n- prop[at] = (prop[at] + v) % mod;\n- slope[at] = (slope[at] + v2) % mod;\n- pslope[at] = (pslope[at] + v2) % mod;\n- return;\n- }\n- push(at);\n- go3(x, y, v, v2, left[at]);\n- go3(x, y, v, v2, right[at]);\n+ long query(int node, int b, int e, int i, int j) {\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return sTree[node];\n+ int mid = b + e >> 1;\n+ propagate(node, b, mid, e);\n+ long q1 = query(node << 1, b, mid, i, j);\n+ long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (q1 + q2);\n }\n }\n \n- public static class input {\n- static BufferedReader reader;\n- static StringTokenizer tokenizer;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- static void init(InputStream input) {\n- reader = new BufferedReader(new InputStreamReader(input));\n- tokenizer = new StringTokenizer(\"\");\n+ public Scanner(InputStream system) {\n+ br = new BufferedReader(new InputStreamReader(system));\n }\n \n- static String next() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n-\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n \n- static int nextInt() throws IOException {\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- static double nextDouble() throws IOException {\n+ public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n \n- static long nextLong() throws IOException {\n+ public char nextChar() throws IOException {\n+ return next().charAt(0);\n+ }\n+\n+ public Long nextLong() throws IOException {\n return Long.parseLong(next());\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n+ }\n+\n+ public void waitForInput() {\n+ for (long i = 0; i < 3e9; i++)\n+ ;\n }\n }\n }", "output": "SLOWER 0.0193", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.0135, "pair_id": "java_2283_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.text.*;\n+import java.util.*;\n \n-public class D {\n+public class E397 {\n \n- static int N, t;\n static ArrayList[] adjList;\n- static int[] L, inTime, outTime;\n- static final int MOD = (int) 1e9 + 7;\n+ static int[] s, e, l;\n+ static int t = 0;\n+\n+ public static void findIntervals(int u, int p) {\n+ s[u] = t;\n+ for (int x : adjList[u]) {\n+ if (x != p) {\n+ t++;\n+ l[x] = l[u] + 1;\n+ findIntervals(x, u);\n+ }\n+ }\n+ e[u] = t;\n+ }\n+\n+ static int mod = (int) 1e9 + 7;\n \n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ adjList = new ArrayList[n];\n+ for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n+ for (int i = 1; i <= n - 1; i++) {\n+ int p = sc.nextInt() - 1;\n+ adjList[i].add(p);\n+ adjList[p].add(i);\n+ }\n+ s = new int[n];\n+ e = new int[n];\n+ l = new int[n];\n+ findIntervals(0, -1);\n+ int N = 1;\n+ while (N < n) N <<= 1;\n \n- N = sc.nextInt();\n- adjList = new ArrayList[N];\n- for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n- for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n-\n- t = 0;\n- L = new int[N];\n- inTime = new int[N];\n- outTime = new int[N];\n- dfs(0, 0);\n-\n- int n = 1;\n- while (n < N) n <<= 1;\n- int[] in1 = new int[n + 1], in2 = new int[n + 1];\n- SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n-\n+ SegmentTree st1 = new SegmentTree(N);\n+ SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n- int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n- if (t == 1) {\n- int x = sc.nextInt(), k = sc.nextInt();\n- st1.update_range(l, r, x + (1l * k * L[v]));\n- st2.update_range(l, r, k);\n+ if (sc.nextInt() == 1) {\n+ int v = sc.nextInt() - 1;\n+ int x = sc.nextInt();\n+ int k = sc.nextInt();\n+ st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n+ st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n- int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n- int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n- out.println((sum1 - sum2 + MOD) % MOD);\n+ int v = sc.nextInt() - 1;\n+ long x =\n+ 1l * st1.query(s[v] + 1, s[v] + 1)\n+ - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n+ while (x < 0) x += mod;\n+ x %= mod;\n+ pw.println(x);\n }\n }\n- out.flush();\n- out.close();\n- }\n \n- static void dfs(int u, int l) {\n- inTime[u] = ++t;\n- L[u] = l;\n- for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n- outTime[u] = t;\n+ pw.close();\n }\n \n static class SegmentTree {\n \n int N;\n- int[] array;\n- long[] sTree, lazy;\n+ int[] sTree, lazy;\n \n- SegmentTree(int[] in) {\n- array = in;\n- N = in.length - 1;\n- sTree = new long[N << 1];\n- lazy = new long[N << 1];\n+ SegmentTree(int N) {\n+ this.N = N;\n+ sTree = new int[N << 1];\n+ lazy = new int[N << 1];\n }\n \n- void update_range(int i, int j, long val) {\n+ void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n \n- void update_range(int node, int b, int e, int i, int j, long val) {\n+ void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n- sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n- lazy[node] %= MOD;\n+ lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n+\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n \n- void propagate(int node, int b, int mid, int e) {\n- lazy[node << 1] += lazy[node];\n- lazy[node << 1 | 1] += lazy[node];\n- sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n- sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n- lazy[node] = 0;\n- }\n-\n- long query(int i, int j) {\n+ int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n \n- long query(int node, int b, int e, int i, int j) {\n+ int query(int node, int b, int e, int i, int j) {\n+\n if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return sTree[node];\n+ if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n- propagate(node, b, mid, e);\n- long q1 = query(node << 1, b, mid, i, j);\n- long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (q1 + q2);\n+\n+ int q1 = query(node << 1, b, mid, i, j);\n+ int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n \n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n \n- public Scanner(InputStream system) {\n- br = new BufferedReader(new InputStreamReader(system));\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n+ }\n+\n+ public Scanner(FileReader r) {\n+ br = new BufferedReader(r);\n }\n \n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n public String nextLine() throws IOException {\n return br.readLine();\n }\n \n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n public double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- public char nextChar() throws IOException {\n- return next().charAt(0);\n- }\n-\n- public Long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n }\n \n public boolean ready() throws IOException {\n return br.ready();\n }\n-\n- public void waitForInput() {\n- for (long i = 0; i < 3e9; i++)\n- ;\n- }\n }\n }", "output": "FASTER 0.3012", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.2322, "pair_id": "java_2280_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class D {\n\n static int N, t;\n static ArrayList[] adjList;\n static int[] L, inTime, outTime;\n static final int MOD = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n N = sc.nextInt();\n adjList = new ArrayList[N];\n for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n\n t = 0;\n L = new int[N];\n inTime = new int[N];\n outTime = new int[N];\n dfs(0, 0);\n\n int n = 1;\n while (n < N) n <<= 1;\n int[] in1 = new int[n + 1], in2 = new int[n + 1];\n SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n\n int q = sc.nextInt();\n while (q-- > 0) {\n int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n if (t == 1) {\n int x = sc.nextInt(), k = sc.nextInt();\n st1.update_range(l, r, x + (1l * k * L[v]));\n st2.update_range(l, r, k);\n } else {\n int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n out.flush();\n out.close();\n }\n\n static void dfs(int u, int l) {\n inTime[u] = ++t;\n L[u] = l;\n for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n outTime[u] = t;\n }\n\n static class SegmentTree {\n\n int N;\n int[] array;\n long[] sTree, lazy;\n\n SegmentTree(int[] in) {\n array = in;\n N = in.length - 1;\n sTree = new long[N << 1];\n lazy = new long[N << 1];\n }\n\n void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n\n void propagate(int node, int b, int mid, int e) {\n lazy[node << 1] += lazy[node];\n lazy[node << 1 | 1] += lazy[node];\n sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n lazy[node] = 0;\n }\n\n long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n propagate(node, b, mid, e);\n long q1 = query(node << 1, b, mid, i, j);\n long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (q1 + q2);\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream system) {\n br = new BufferedReader(new InputStreamReader(system));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n public char nextChar() throws IOException {\n return next().charAt(0);\n }\n\n public Long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n\n public void waitForInput() {\n for (long i = 0; i < 3e9; i++)\n ;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.text.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class E397 {\n+public class D {\n \n+ static int N, t;\n static ArrayList[] adjList;\n- static int[] s, e, l;\n- static int t = 0;\n-\n- public static void findIntervals(int u, int p) {\n- s[u] = t;\n- for (int x : adjList[u]) {\n- if (x != p) {\n- t++;\n- l[x] = l[u] + 1;\n- findIntervals(x, u);\n- }\n- }\n- e[u] = t;\n- }\n-\n- static int mod = (int) 1e9 + 7;\n+ static int[] L, inTime, outTime;\n+ static final int MOD = (int) 1e9 + 7;\n \n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- adjList = new ArrayList[n];\n- for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n- for (int i = 1; i <= n - 1; i++) {\n- int p = sc.nextInt() - 1;\n- adjList[i].add(p);\n- adjList[p].add(i);\n- }\n- s = new int[n];\n- e = new int[n];\n- l = new int[n];\n- findIntervals(0, -1);\n- int N = 1;\n- while (N < n) N <<= 1;\n+ PrintWriter out = new PrintWriter(System.out);\n \n- SegmentTree st1 = new SegmentTree(N);\n- SegmentTree st2 = new SegmentTree(N);\n+ N = sc.nextInt();\n+ adjList = new ArrayList[N];\n+ for (int i = 0; i < N; i++) adjList[i] = new ArrayList<>();\n+ for (int i = 1; i < N; i++) adjList[sc.nextInt() - 1].add(i);\n+\n+ t = 0;\n+ L = new int[N];\n+ inTime = new int[N];\n+ outTime = new int[N];\n+ dfs(0, 0);\n+\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ int[] in1 = new int[n + 1], in2 = new int[n + 1];\n+ SegmentTree st1 = new SegmentTree(in1), st2 = new SegmentTree(in2);\n+\n int q = sc.nextInt();\n while (q-- > 0) {\n- if (sc.nextInt() == 1) {\n- int v = sc.nextInt() - 1;\n- int x = sc.nextInt();\n- int k = sc.nextInt();\n- st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n- st2.update_range(s[v] + 1, e[v] + 1, k);\n+ int t = sc.nextInt(), v = sc.nextInt() - 1, l = inTime[v], r = outTime[v];\n+ if (t == 1) {\n+ int x = sc.nextInt(), k = sc.nextInt();\n+ st1.update_range(l, r, x + (1l * k * L[v]));\n+ st2.update_range(l, r, k);\n } else {\n- int v = sc.nextInt() - 1;\n- long x =\n- 1l * st1.query(s[v] + 1, s[v] + 1)\n- - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n- while (x < 0) x += mod;\n- x %= mod;\n- pw.println(x);\n+ int sum1 = (int) (((st1.query(l, l) % MOD) + MOD) % MOD);\n+ int sum2 = (int) (L[v] * (((st2.query(l, l) % MOD) + MOD) % MOD) % MOD);\n+ out.println((sum1 - sum2 + MOD) % MOD);\n }\n }\n+ out.flush();\n+ out.close();\n+ }\n \n- pw.close();\n+ static void dfs(int u, int l) {\n+ inTime[u] = ++t;\n+ L[u] = l;\n+ for (int v : adjList[u]) if (inTime[v] == 0) dfs(v, l + 1);\n+ outTime[u] = t;\n }\n \n static class SegmentTree {\n \n int N;\n- int[] sTree, lazy;\n+ int[] array;\n+ long[] sTree, lazy;\n \n- SegmentTree(int N) {\n- this.N = N;\n- sTree = new int[N << 1];\n- lazy = new int[N << 1];\n+ SegmentTree(int[] in) {\n+ array = in;\n+ N = in.length - 1;\n+ sTree = new long[N << 1];\n+ lazy = new long[N << 1];\n }\n \n- void update_range(int i, int j, int val) {\n+ void update_range(int i, int j, long val) {\n update_range(1, 1, N, i, j, val);\n }\n \n- void update_range(int node, int b, int e, int i, int j, int val) {\n+ void update_range(int node, int b, int e, int i, int j, long val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n+ sTree[node] += (e - b + 1) * val % MOD;\n lazy[node] += val;\n- lazy[node] %= mod;\n+ lazy[node] %= MOD;\n } else {\n int mid = b + e >> 1;\n-\n+ propagate(node, b, mid, e);\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ sTree[node] = sTree[node << 1] + sTree[node << 1 | 1];\n }\n }\n \n- int query(int i, int j) {\n+ void propagate(int node, int b, int mid, int e) {\n+ lazy[node << 1] += lazy[node];\n+ lazy[node << 1 | 1] += lazy[node];\n+ sTree[node << 1] += (mid - b + 1) * lazy[node] % MOD;\n+ sTree[node << 1 | 1] += (e - mid) * lazy[node] % MOD;\n+ lazy[node] = 0;\n+ }\n+\n+ long query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n \n- int query(int node, int b, int e, int i, int j) {\n-\n+ long query(int node, int b, int e, int i, int j) {\n if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return lazy[node];\n+ if (b >= i && e <= j) return sTree[node];\n int mid = b + e >> 1;\n-\n- int q1 = query(node << 1, b, mid, i, j);\n- int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (((q1 + q2) % mod) + lazy[node]) % mod;\n+ propagate(node, b, mid, e);\n+ long q1 = query(node << 1, b, mid, i, j);\n+ long q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (q1 + q2);\n }\n }\n \n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n \n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public Scanner(FileReader r) {\n- br = new BufferedReader(r);\n+ public Scanner(InputStream system) {\n+ br = new BufferedReader(new InputStreamReader(system));\n }\n \n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ public double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n }\n \n- public String nextLine() throws IOException {\n- return br.readLine();\n+ public char nextChar() throws IOException {\n+ return next().charAt(0);\n }\n \n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n+ public Long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n \n public boolean ready() throws IOException {\n return br.ready();\n }\n+\n+ public void waitForInput() {\n+ for (long i = 0; i < 3e9; i++)\n+ ;\n+ }\n }\n }", "output": "SLOWER 0.3012", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.2322, "pair_id": "java_2280_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.text.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class E397 {\n+public class CF_396 {\n \n- static ArrayList[] adjList;\n- static int[] s, e, l;\n- static int t = 0;\n+ static int[] in, ou, h;\n+ static ArrayList[] tree;\n+ static int time;\n \n- public static void findIntervals(int u, int p) {\n- s[u] = t;\n- for (int x : adjList[u]) {\n- if (x != p) {\n- t++;\n- l[x] = l[u] + 1;\n- findIntervals(x, u);\n- }\n- }\n- e[u] = t;\n+ static void dfs(int u, int p) {\n+ in[u] = ++time;\n+ h[u] = h[p] + 1;\n+ for (int v : tree[u]) dfs(v, u);\n+ ou[u] = time;\n }\n \n- static int mod = (int) 1e9 + 7;\n+ private static final int MOD = (int) (1e9 + 7);\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- adjList = new ArrayList[n];\n- for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n- for (int i = 1; i <= n - 1; i++) {\n- int p = sc.nextInt() - 1;\n- adjList[i].add(p);\n- adjList[p].add(i);\n- }\n- s = new int[n];\n- e = new int[n];\n- l = new int[n];\n- findIntervals(0, -1);\n- int N = 1;\n- while (N < n) N <<= 1;\n+ static class SegmentTree {\n+ int[] st, sk;\n+ int N;\n \n- SegmentTree st1 = new SegmentTree(N);\n- SegmentTree st2 = new SegmentTree(N);\n- int q = sc.nextInt();\n- while (q-- > 0) {\n- if (sc.nextInt() == 1) {\n- int v = sc.nextInt() - 1;\n- int x = sc.nextInt();\n- int k = sc.nextInt();\n- st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n- st2.update_range(s[v] + 1, e[v] + 1, k);\n- } else {\n- int v = sc.nextInt() - 1;\n- long x =\n- 1l * st1.query(s[v] + 1, s[v] + 1)\n- - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n- while (x < 0) x += mod;\n- x %= mod;\n- pw.println(x);\n- }\n+ SegmentTree(int n) {\n+ N = n;\n+ st = new int[N << 1];\n+ sk = new int[N << 1];\n }\n \n- pw.close();\n- }\n-\n- static class SegmentTree {\n-\n- int N;\n- int[] sTree, lazy;\n-\n- SegmentTree(int N) {\n- this.N = N;\n- sTree = new int[N << 1];\n- lazy = new int[N << 1];\n+ void update(int cur, int node, int l, int r, int x, int k) {\n+ if (in[node] > r || ou[node] < l) return;\n+ if (in[node] <= l && ou[node] >= r) {\n+ st[cur] = (st[cur] + x) % MOD;\n+ int toAdd = (int) ((1l * h[node] * k) % MOD);\n+ st[cur] = (st[cur] + toAdd) % MOD;\n+ sk[cur] = (sk[cur] + k) % MOD;\n+ return;\n+ }\n+ int mid = (l + r) >> 1;\n+ update(cur << 1, node, l, mid, x, k);\n+ update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n \n- void update_range(int i, int j, int val) {\n- update_range(1, 1, N, i, j, val);\n- }\n-\n- void update_range(int node, int b, int e, int i, int j, int val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- lazy[node] += val;\n- lazy[node] %= mod;\n- } else {\n- int mid = b + e >> 1;\n-\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- }\n- }\n-\n- int query(int i, int j) {\n- return query(1, 1, N, i, j);\n- }\n-\n- int query(int node, int b, int e, int i, int j) {\n-\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return lazy[node];\n- int mid = b + e >> 1;\n-\n- int q1 = query(node << 1, b, mid, i, j);\n- int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (((q1 + q2) % mod) + lazy[node]) % mod;\n+ int query(int cur, int node, int l, int r) {\n+ int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n+ int answer = (st[cur] + MOD - toMinus) % MOD;\n+ if (r - l < 1) return answer;\n+ int mid = (l + r) >> 1;\n+ if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n+ return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n \n- static class Scanner {\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n+ int N = Integer.parseInt(br.readLine());\n+ tree = new ArrayList[N + 1];\n+ in = new int[N + 1];\n+ ou = new int[N + 1];\n+ h = new int[N + 1];\n+ for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n+ st = new StringTokenizer(br.readLine());\n+ for (int i = 2; i <= N; ++i) {\n+ int v = Integer.parseInt(st.nextToken());\n+ tree[v].add(i);\n }\n-\n- public Scanner(FileReader r) {\n- br = new BufferedReader(r);\n+ time = 0;\n+ dfs(1, 0);\n+ int Q = Integer.parseInt(br.readLine());\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ SegmentTree segTree = new SegmentTree(n);\n+ while (Q-- > 0) {\n+ st = new StringTokenizer(br.readLine());\n+ int t = Integer.parseInt(st.nextToken());\n+ if (t == 2) {\n+ int u = Integer.parseInt(st.nextToken());\n+ out.println(segTree.query(1, u, 1, segTree.N));\n+ } else {\n+ int v = Integer.parseInt(st.nextToken()),\n+ x = Integer.parseInt(st.nextToken()),\n+ k = Integer.parseInt(st.nextToken());\n+ segTree.update(1, v, 1, segTree.N, x, k);\n+ }\n }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n- }\n+ out.flush();\n+ out.close();\n }\n }", "output": "FASTER 0.1626", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.1193, "pair_id": "java_2274_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.ArrayList;\n-import java.util.StringTokenizer;\n+import java.io.*;\n+import java.text.*;\n+import java.util.*;\n \n-public class CF_396 {\n+public class E397 {\n \n- static int[] in, ou, h;\n- static ArrayList[] tree;\n- static int time;\n+ static ArrayList[] adjList;\n+ static int[] s, e, l;\n+ static int t = 0;\n \n- static void dfs(int u, int p) {\n- in[u] = ++time;\n- h[u] = h[p] + 1;\n- for (int v : tree[u]) dfs(v, u);\n- ou[u] = time;\n+ public static void findIntervals(int u, int p) {\n+ s[u] = t;\n+ for (int x : adjList[u]) {\n+ if (x != p) {\n+ t++;\n+ l[x] = l[u] + 1;\n+ findIntervals(x, u);\n+ }\n+ }\n+ e[u] = t;\n }\n \n- private static final int MOD = (int) (1e9 + 7);\n+ static int mod = (int) 1e9 + 7;\n+\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ adjList = new ArrayList[n];\n+ for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n+ for (int i = 1; i <= n - 1; i++) {\n+ int p = sc.nextInt() - 1;\n+ adjList[i].add(p);\n+ adjList[p].add(i);\n+ }\n+ s = new int[n];\n+ e = new int[n];\n+ l = new int[n];\n+ findIntervals(0, -1);\n+ int N = 1;\n+ while (N < n) N <<= 1;\n+\n+ SegmentTree st1 = new SegmentTree(N);\n+ SegmentTree st2 = new SegmentTree(N);\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ if (sc.nextInt() == 1) {\n+ int v = sc.nextInt() - 1;\n+ int x = sc.nextInt();\n+ int k = sc.nextInt();\n+ st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n+ st2.update_range(s[v] + 1, e[v] + 1, k);\n+ } else {\n+ int v = sc.nextInt() - 1;\n+ long x =\n+ 1l * st1.query(s[v] + 1, s[v] + 1)\n+ - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n+ while (x < 0) x += mod;\n+ x %= mod;\n+ pw.println(x);\n+ }\n+ }\n+\n+ pw.close();\n+ }\n \n static class SegmentTree {\n- int[] st, sk;\n+\n int N;\n+ int[] sTree, lazy;\n \n- SegmentTree(int n) {\n- N = n;\n- st = new int[N << 1];\n- sk = new int[N << 1];\n+ SegmentTree(int N) {\n+ this.N = N;\n+ sTree = new int[N << 1];\n+ lazy = new int[N << 1];\n }\n \n- void update(int cur, int node, int l, int r, int x, int k) {\n- if (in[node] > r || ou[node] < l) return;\n- if (in[node] <= l && ou[node] >= r) {\n- st[cur] = (st[cur] + x) % MOD;\n- int toAdd = (int) ((1l * h[node] * k) % MOD);\n- st[cur] = (st[cur] + toAdd) % MOD;\n- sk[cur] = (sk[cur] + k) % MOD;\n- return;\n- }\n- int mid = (l + r) >> 1;\n- update(cur << 1, node, l, mid, x, k);\n- update((cur << 1) | 1, node, mid + 1, r, x, k);\n+ void update_range(int i, int j, int val) {\n+ update_range(1, 1, N, i, j, val);\n }\n \n- int query(int cur, int node, int l, int r) {\n- int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n- int answer = (st[cur] + MOD - toMinus) % MOD;\n- if (r - l < 1) return answer;\n- int mid = (l + r) >> 1;\n- if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n- return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n+ void update_range(int node, int b, int e, int i, int j, int val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ lazy[node] += val;\n+ lazy[node] %= mod;\n+ } else {\n+ int mid = b + e >> 1;\n+\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n+ }\n+ }\n+\n+ int query(int i, int j) {\n+ return query(1, 1, N, i, j);\n+ }\n+\n+ int query(int node, int b, int e, int i, int j) {\n+\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return lazy[node];\n+ int mid = b + e >> 1;\n+\n+ int q1 = query(node << 1, b, mid, i, j);\n+ int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(System.out);\n+ static class Scanner {\n StringTokenizer st;\n- int N = Integer.parseInt(br.readLine());\n- tree = new ArrayList[N + 1];\n- in = new int[N + 1];\n- ou = new int[N + 1];\n- h = new int[N + 1];\n- for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n- st = new StringTokenizer(br.readLine());\n- for (int i = 2; i <= N; ++i) {\n- int v = Integer.parseInt(st.nextToken());\n- tree[v].add(i);\n+ BufferedReader br;\n+\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n- time = 0;\n- dfs(1, 0);\n- int Q = Integer.parseInt(br.readLine());\n- int n = 1;\n- while (n < N) n <<= 1;\n- SegmentTree segTree = new SegmentTree(n);\n- while (Q-- > 0) {\n- st = new StringTokenizer(br.readLine());\n- int t = Integer.parseInt(st.nextToken());\n- if (t == 2) {\n- int u = Integer.parseInt(st.nextToken());\n- out.println(segTree.query(1, u, 1, segTree.N));\n- } else {\n- int v = Integer.parseInt(st.nextToken()),\n- x = Integer.parseInt(st.nextToken()),\n- k = Integer.parseInt(st.nextToken());\n- segTree.update(1, v, 1, segTree.N, x, k);\n+\n+ public Scanner(FileReader r) {\n+ br = new BufferedReader(r);\n+ }\n+\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n+ }\n+\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n }\n- out.flush();\n- out.close();\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n+ }\n }\n }", "output": "SLOWER 0.1626", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.1193, "pair_id": "java_2274_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.math.BigInteger;\n+import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.StringTokenizer;\n \n-public class CF_0397_E {\n- public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String[] line;\n+public class CF_396 {\n \n- line = br.readLine().split(\" \");\n- int N = Integer.parseInt(line[0]);\n+ static int[] in, ou, h;\n+ static ArrayList[] tree;\n+ static int time;\n \n- nexts = new ArrayList[N];\n- for (int n = 0; n < N; n++) {\n- nexts[n] = new ArrayList<>();\n- }\n- line = br.readLine().split(\" \");\n- for (int n = 1; n < N; n++) {\n- int a = Integer.parseInt(line[n - 1]) - 1;\n- nexts[a].add(n);\n+ static void dfs(int u, int p) {\n+ in[u] = ++time;\n+ h[u] = h[p] + 1;\n+ for (int v : tree[u]) dfs(v, u);\n+ ou[u] = time;\n+ }\n+\n+ private static final int MOD = (int) (1e9 + 7);\n+\n+ static class SegmentTree {\n+ int[] st, sk;\n+ int N;\n+\n+ SegmentTree(int n) {\n+ N = n;\n+ st = new int[N << 1];\n+ sk = new int[N << 1];\n }\n \n- trav = new int[2 * N - 1];\n- first = new int[N];\n- last = new int[N];\n- depth = new int[N];\n+ void update(int cur, int node, int l, int r, int x, int k) {\n+ if (in[node] > r || ou[node] < l) return;\n+ if (in[node] <= l && ou[node] >= r) {\n+ st[cur] = (st[cur] + x) % MOD;\n+ int toAdd = (int) ((1l * h[node] * k) % MOD);\n+ st[cur] = (st[cur] + toAdd) % MOD;\n+ sk[cur] = (sk[cur] + k) % MOD;\n+ return;\n+ }\n+ int mid = (l + r) >> 1;\n+ update(cur << 1, node, l, mid, x, k);\n+ update((cur << 1) | 1, node, mid + 1, r, x, k);\n+ }\n \n- createTrav(0, 0);\n-\n- FenwickTree slope = new FenwickTree(2 * N - 1);\n- FenwickTree sect = new FenwickTree(2 * N - 1);\n-\n- StringBuilder sb = new StringBuilder();\n- line = br.readLine().split(\" \");\n- int Q = Integer.parseInt(line[0]);\n- for (int q = 0; q < Q; q++) {\n- line = br.readLine().split(\" \");\n- if (line.length == 4) {\n- int V = Integer.parseInt(line[1]) - 1;\n- int X = Integer.parseInt(line[2]);\n- int K = Integer.parseInt(line[3]);\n-\n- long qslope = K;\n- long qsect = X + (depth[V] * (long) K);\n- qsect %= 1_000_000_007;\n-\n- slope.modify(first[V], qslope);\n- slope.modify(last[V] + 1, -qslope);\n- sect.modify(first[V], qsect);\n- sect.modify(last[V] + 1, -qsect);\n- } else {\n- int V = Integer.parseInt(line[1]) - 1;\n- long qslope = slope.rsq(first[V]);\n- long qsect = sect.rsq(first[V]);\n-\n- BigInteger result =\n- (new BigInteger(\"\" + qsect))\n- .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n- result = result.mod(new BigInteger(\"1000000007\"));\n- sb.append(result.toString()).append('\\n');\n- }\n- }\n- System.out.println(sb);\n- }\n-\n- static ArrayList[] nexts;\n- static int[] trav;\n- static int tsize = 0;\n- static int[] depth;\n- static int[] first, last;\n-\n- static void createTrav(int start, int dep) {\n- trav[tsize] = start;\n- first[start] = tsize;\n- last[start] = tsize;\n- depth[start] = dep;\n- tsize++;\n- for (int i = 0; i < nexts[start].size(); i++) {\n- int next = nexts[start].get(i);\n- createTrav(next, dep + 1);\n- trav[tsize] = start;\n- last[start] = tsize;\n- tsize++;\n+ int query(int cur, int node, int l, int r) {\n+ int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n+ int answer = (st[cur] + MOD - toMinus) % MOD;\n+ if (r - l < 1) return answer;\n+ int mid = (l + r) >> 1;\n+ if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n+ return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n \n- static class FenwickTree {\n- long[] arr;\n-\n- FenwickTree(int size) {\n- arr = new long[size + 1];\n+ public static void main(String[] args) throws NumberFormatException, IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ PrintWriter out = new PrintWriter(System.out);\n+ StringTokenizer st;\n+ int N = Integer.parseInt(br.readLine());\n+ tree = new ArrayList[N + 1];\n+ in = new int[N + 1];\n+ ou = new int[N + 1];\n+ h = new int[N + 1];\n+ for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n+ st = new StringTokenizer(br.readLine());\n+ for (int i = 2; i <= N; ++i) {\n+ int v = Integer.parseInt(st.nextToken());\n+ tree[v].add(i);\n }\n-\n- long rsq(int chl) {\n- long sum = 0;\n- do {\n- sum += arr[chl];\n- chl = dep(chl);\n- } while (chl != -1);\n- return sum;\n- }\n-\n- void modify(int chl, long amount) {\n- while (chl < arr.length) {\n- arr[chl] += amount;\n- chl += ((~chl) & (-(~chl)));\n+ time = 0;\n+ dfs(1, 0);\n+ int Q = Integer.parseInt(br.readLine());\n+ int n = 1;\n+ while (n < N) n <<= 1;\n+ SegmentTree segTree = new SegmentTree(n);\n+ while (Q-- > 0) {\n+ st = new StringTokenizer(br.readLine());\n+ int t = Integer.parseInt(st.nextToken());\n+ if (t == 2) {\n+ int u = Integer.parseInt(st.nextToken());\n+ out.println(segTree.query(1, u, 1, segTree.N));\n+ } else {\n+ int v = Integer.parseInt(st.nextToken()),\n+ x = Integer.parseInt(st.nextToken()),\n+ k = Integer.parseInt(st.nextToken());\n+ segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n-\n- private int dep(int a) {\n- a++;\n- return a - (a & (-a)) - 1;\n- }\n+ out.flush();\n+ out.close();\n }\n }", "output": "FASTER 0.3608", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.2841, "pair_id": "java_2275_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.StringTokenizer;\n\npublic class CF_396 {\n\n static int[] in, ou, h;\n static ArrayList[] tree;\n static int time;\n\n static void dfs(int u, int p) {\n in[u] = ++time;\n h[u] = h[p] + 1;\n for (int v : tree[u]) dfs(v, u);\n ou[u] = time;\n }\n\n private static final int MOD = (int) (1e9 + 7);\n\n static class SegmentTree {\n int[] st, sk;\n int N;\n\n SegmentTree(int n) {\n N = n;\n st = new int[N << 1];\n sk = new int[N << 1];\n }\n\n void update(int cur, int node, int l, int r, int x, int k) {\n if (in[node] > r || ou[node] < l) return;\n if (in[node] <= l && ou[node] >= r) {\n st[cur] = (st[cur] + x) % MOD;\n int toAdd = (int) ((1l * h[node] * k) % MOD);\n st[cur] = (st[cur] + toAdd) % MOD;\n sk[cur] = (sk[cur] + k) % MOD;\n return;\n }\n int mid = (l + r) >> 1;\n update(cur << 1, node, l, mid, x, k);\n update((cur << 1) | 1, node, mid + 1, r, x, k);\n }\n\n int query(int cur, int node, int l, int r) {\n int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n int answer = (st[cur] + MOD - toMinus) % MOD;\n if (r - l < 1) return answer;\n int mid = (l + r) >> 1;\n if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n }\n }\n\n public static void main(String[] args) throws NumberFormatException, IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n PrintWriter out = new PrintWriter(System.out);\n StringTokenizer st;\n int N = Integer.parseInt(br.readLine());\n tree = new ArrayList[N + 1];\n in = new int[N + 1];\n ou = new int[N + 1];\n h = new int[N + 1];\n for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n st = new StringTokenizer(br.readLine());\n for (int i = 2; i <= N; ++i) {\n int v = Integer.parseInt(st.nextToken());\n tree[v].add(i);\n }\n time = 0;\n dfs(1, 0);\n int Q = Integer.parseInt(br.readLine());\n int n = 1;\n while (n < N) n <<= 1;\n SegmentTree segTree = new SegmentTree(n);\n while (Q-- > 0) {\n st = new StringTokenizer(br.readLine());\n int t = Integer.parseInt(st.nextToken());\n if (t == 2) {\n int u = Integer.parseInt(st.nextToken());\n out.println(segTree.query(1, u, 1, segTree.N));\n } else {\n int v = Integer.parseInt(st.nextToken()),\n x = Integer.parseInt(st.nextToken()),\n k = Integer.parseInt(st.nextToken());\n segTree.update(1, v, 1, segTree.N, x, k);\n }\n }\n out.flush();\n out.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n+import java.math.BigInteger;\n import java.util.ArrayList;\n-import java.util.StringTokenizer;\n \n-public class CF_396 {\n+public class CF_0397_E {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String[] line;\n \n- static int[] in, ou, h;\n- static ArrayList[] tree;\n- static int time;\n+ line = br.readLine().split(\" \");\n+ int N = Integer.parseInt(line[0]);\n \n- static void dfs(int u, int p) {\n- in[u] = ++time;\n- h[u] = h[p] + 1;\n- for (int v : tree[u]) dfs(v, u);\n- ou[u] = time;\n+ nexts = new ArrayList[N];\n+ for (int n = 0; n < N; n++) {\n+ nexts[n] = new ArrayList<>();\n+ }\n+ line = br.readLine().split(\" \");\n+ for (int n = 1; n < N; n++) {\n+ int a = Integer.parseInt(line[n - 1]) - 1;\n+ nexts[a].add(n);\n+ }\n+\n+ trav = new int[2 * N - 1];\n+ first = new int[N];\n+ last = new int[N];\n+ depth = new int[N];\n+\n+ createTrav(0, 0);\n+\n+ FenwickTree slope = new FenwickTree(2 * N - 1);\n+ FenwickTree sect = new FenwickTree(2 * N - 1);\n+\n+ StringBuilder sb = new StringBuilder();\n+ line = br.readLine().split(\" \");\n+ int Q = Integer.parseInt(line[0]);\n+ for (int q = 0; q < Q; q++) {\n+ line = br.readLine().split(\" \");\n+ if (line.length == 4) {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ int X = Integer.parseInt(line[2]);\n+ int K = Integer.parseInt(line[3]);\n+\n+ long qslope = K;\n+ long qsect = X + (depth[V] * (long) K);\n+ qsect %= 1_000_000_007;\n+\n+ slope.modify(first[V], qslope);\n+ slope.modify(last[V] + 1, -qslope);\n+ sect.modify(first[V], qsect);\n+ sect.modify(last[V] + 1, -qsect);\n+ } else {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ long qslope = slope.rsq(first[V]);\n+ long qsect = sect.rsq(first[V]);\n+\n+ BigInteger result =\n+ (new BigInteger(\"\" + qsect))\n+ .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n+ result = result.mod(new BigInteger(\"1000000007\"));\n+ sb.append(result.toString()).append('\\n');\n+ }\n+ }\n+ System.out.println(sb);\n }\n \n- private static final int MOD = (int) (1e9 + 7);\n+ static ArrayList[] nexts;\n+ static int[] trav;\n+ static int tsize = 0;\n+ static int[] depth;\n+ static int[] first, last;\n \n- static class SegmentTree {\n- int[] st, sk;\n- int N;\n-\n- SegmentTree(int n) {\n- N = n;\n- st = new int[N << 1];\n- sk = new int[N << 1];\n- }\n-\n- void update(int cur, int node, int l, int r, int x, int k) {\n- if (in[node] > r || ou[node] < l) return;\n- if (in[node] <= l && ou[node] >= r) {\n- st[cur] = (st[cur] + x) % MOD;\n- int toAdd = (int) ((1l * h[node] * k) % MOD);\n- st[cur] = (st[cur] + toAdd) % MOD;\n- sk[cur] = (sk[cur] + k) % MOD;\n- return;\n- }\n- int mid = (l + r) >> 1;\n- update(cur << 1, node, l, mid, x, k);\n- update((cur << 1) | 1, node, mid + 1, r, x, k);\n- }\n-\n- int query(int cur, int node, int l, int r) {\n- int toMinus = (int) ((1l * h[node] * sk[cur]) % MOD);\n- int answer = (st[cur] + MOD - toMinus) % MOD;\n- if (r - l < 1) return answer;\n- int mid = (l + r) >> 1;\n- if (in[node] <= mid) return (answer + query(cur << 1, node, l, mid)) % MOD;\n- return (answer + query((cur << 1) | 1, node, mid + 1, r)) % MOD;\n+ static void createTrav(int start, int dep) {\n+ trav[tsize] = start;\n+ first[start] = tsize;\n+ last[start] = tsize;\n+ depth[start] = dep;\n+ tsize++;\n+ for (int i = 0; i < nexts[start].size(); i++) {\n+ int next = nexts[start].get(i);\n+ createTrav(next, dep + 1);\n+ trav[tsize] = start;\n+ last[start] = tsize;\n+ tsize++;\n }\n }\n \n- public static void main(String[] args) throws NumberFormatException, IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- PrintWriter out = new PrintWriter(System.out);\n- StringTokenizer st;\n- int N = Integer.parseInt(br.readLine());\n- tree = new ArrayList[N + 1];\n- in = new int[N + 1];\n- ou = new int[N + 1];\n- h = new int[N + 1];\n- for (int i = 0; i <= N; ++i) tree[i] = new ArrayList();\n- st = new StringTokenizer(br.readLine());\n- for (int i = 2; i <= N; ++i) {\n- int v = Integer.parseInt(st.nextToken());\n- tree[v].add(i);\n+ static class FenwickTree {\n+ long[] arr;\n+\n+ FenwickTree(int size) {\n+ arr = new long[size + 1];\n }\n- time = 0;\n- dfs(1, 0);\n- int Q = Integer.parseInt(br.readLine());\n- int n = 1;\n- while (n < N) n <<= 1;\n- SegmentTree segTree = new SegmentTree(n);\n- while (Q-- > 0) {\n- st = new StringTokenizer(br.readLine());\n- int t = Integer.parseInt(st.nextToken());\n- if (t == 2) {\n- int u = Integer.parseInt(st.nextToken());\n- out.println(segTree.query(1, u, 1, segTree.N));\n- } else {\n- int v = Integer.parseInt(st.nextToken()),\n- x = Integer.parseInt(st.nextToken()),\n- k = Integer.parseInt(st.nextToken());\n- segTree.update(1, v, 1, segTree.N, x, k);\n+\n+ long rsq(int chl) {\n+ long sum = 0;\n+ do {\n+ sum += arr[chl];\n+ chl = dep(chl);\n+ } while (chl != -1);\n+ return sum;\n+ }\n+\n+ void modify(int chl, long amount) {\n+ while (chl < arr.length) {\n+ arr[chl] += amount;\n+ chl += ((~chl) & (-(~chl)));\n }\n }\n- out.flush();\n- out.close();\n+\n+ private int dep(int a) {\n+ a++;\n+ return a - (a & (-a)) - 1;\n+ }\n }\n }", "output": "SLOWER 0.3608", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.2841, "pair_id": "java_2275_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.math.BigInteger;\n-import java.util.ArrayList;\n+import java.io.*;\n+import java.text.*;\n+import java.util.*;\n \n-public class CF_0397_E {\n+public class E397 {\n+\n+ static ArrayList[] adjList;\n+ static int[] s, e, l;\n+ static int t = 0;\n+\n+ public static void findIntervals(int u, int p) {\n+ s[u] = t;\n+ for (int x : adjList[u]) {\n+ if (x != p) {\n+ t++;\n+ l[x] = l[u] + 1;\n+ findIntervals(x, u);\n+ }\n+ }\n+ e[u] = t;\n+ }\n+\n+ static int mod = (int) 1e9 + 7;\n+\n public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String[] line;\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter pw = new PrintWriter(System.out);\n+ int n = sc.nextInt();\n+ adjList = new ArrayList[n];\n+ for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n+ for (int i = 1; i <= n - 1; i++) {\n+ int p = sc.nextInt() - 1;\n+ adjList[i].add(p);\n+ adjList[p].add(i);\n+ }\n+ s = new int[n];\n+ e = new int[n];\n+ l = new int[n];\n+ findIntervals(0, -1);\n+ int N = 1;\n+ while (N < n) N <<= 1;\n \n- line = br.readLine().split(\" \");\n- int N = Integer.parseInt(line[0]);\n-\n- nexts = new ArrayList[N];\n- for (int n = 0; n < N; n++) {\n- nexts[n] = new ArrayList<>();\n- }\n- line = br.readLine().split(\" \");\n- for (int n = 1; n < N; n++) {\n- int a = Integer.parseInt(line[n - 1]) - 1;\n- nexts[a].add(n);\n+ SegmentTree st1 = new SegmentTree(N);\n+ SegmentTree st2 = new SegmentTree(N);\n+ int q = sc.nextInt();\n+ while (q-- > 0) {\n+ if (sc.nextInt() == 1) {\n+ int v = sc.nextInt() - 1;\n+ int x = sc.nextInt();\n+ int k = sc.nextInt();\n+ st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n+ st2.update_range(s[v] + 1, e[v] + 1, k);\n+ } else {\n+ int v = sc.nextInt() - 1;\n+ long x =\n+ 1l * st1.query(s[v] + 1, s[v] + 1)\n+ - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n+ while (x < 0) x += mod;\n+ x %= mod;\n+ pw.println(x);\n+ }\n }\n \n- trav = new int[2 * N - 1];\n- first = new int[N];\n- last = new int[N];\n- depth = new int[N];\n+ pw.close();\n+ }\n \n- createTrav(0, 0);\n+ static class SegmentTree {\n \n- FenwickTree slope = new FenwickTree(2 * N - 1);\n- FenwickTree sect = new FenwickTree(2 * N - 1);\n+ int N;\n+ int[] sTree, lazy;\n \n- StringBuilder sb = new StringBuilder();\n- line = br.readLine().split(\" \");\n- int Q = Integer.parseInt(line[0]);\n- for (int q = 0; q < Q; q++) {\n- line = br.readLine().split(\" \");\n- if (line.length == 4) {\n- int V = Integer.parseInt(line[1]) - 1;\n- int X = Integer.parseInt(line[2]);\n- int K = Integer.parseInt(line[3]);\n+ SegmentTree(int N) {\n+ this.N = N;\n+ sTree = new int[N << 1];\n+ lazy = new int[N << 1];\n+ }\n \n- long qslope = K;\n- long qsect = X + (depth[V] * (long) K);\n- qsect %= 1_000_000_007;\n+ void update_range(int i, int j, int val) {\n+ update_range(1, 1, N, i, j, val);\n+ }\n \n- slope.modify(first[V], qslope);\n- slope.modify(last[V] + 1, -qslope);\n- sect.modify(first[V], qsect);\n- sect.modify(last[V] + 1, -qsect);\n+ void update_range(int node, int b, int e, int i, int j, int val) {\n+ if (i > e || j < b) return;\n+ if (b >= i && e <= j) {\n+ lazy[node] += val;\n+ lazy[node] %= mod;\n } else {\n- int V = Integer.parseInt(line[1]) - 1;\n- long qslope = slope.rsq(first[V]);\n- long qsect = sect.rsq(first[V]);\n+ int mid = b + e >> 1;\n \n- BigInteger result =\n- (new BigInteger(\"\" + qsect))\n- .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n- result = result.mod(new BigInteger(\"1000000007\"));\n- sb.append(result.toString()).append('\\n');\n+ update_range(node << 1, b, mid, i, j, val);\n+ update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n- System.out.println(sb);\n- }\n \n- static ArrayList[] nexts;\n- static int[] trav;\n- static int tsize = 0;\n- static int[] depth;\n- static int[] first, last;\n+ int query(int i, int j) {\n+ return query(1, 1, N, i, j);\n+ }\n \n- static void createTrav(int start, int dep) {\n- trav[tsize] = start;\n- first[start] = tsize;\n- last[start] = tsize;\n- depth[start] = dep;\n- tsize++;\n- for (int i = 0; i < nexts[start].size(); i++) {\n- int next = nexts[start].get(i);\n- createTrav(next, dep + 1);\n- trav[tsize] = start;\n- last[start] = tsize;\n- tsize++;\n+ int query(int node, int b, int e, int i, int j) {\n+\n+ if (i > e || j < b) return 0;\n+ if (b >= i && e <= j) return lazy[node];\n+ int mid = b + e >> 1;\n+\n+ int q1 = query(node << 1, b, mid, i, j);\n+ int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n+ return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n \n- static class FenwickTree {\n- long[] arr;\n+ static class Scanner {\n+ StringTokenizer st;\n+ BufferedReader br;\n \n- FenwickTree(int size) {\n- arr = new long[size + 1];\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n \n- long rsq(int chl) {\n- long sum = 0;\n- do {\n- sum += arr[chl];\n- chl = dep(chl);\n- } while (chl != -1);\n- return sum;\n+ public Scanner(FileReader r) {\n+ br = new BufferedReader(r);\n }\n \n- void modify(int chl, long amount) {\n- while (chl < arr.length) {\n- arr[chl] += amount;\n- chl += ((~chl) & (-(~chl)));\n- }\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+ return st.nextToken();\n }\n \n- private int dep(int a) {\n- a++;\n- return a - (a & (-a)) - 1;\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n+ }\n+\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "FASTER 0.1982", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.1473, "pair_id": "java_2278_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.text.*;\nimport java.util.*;\n\npublic class E397 {\n\n static ArrayList[] adjList;\n static int[] s, e, l;\n static int t = 0;\n\n public static void findIntervals(int u, int p) {\n s[u] = t;\n for (int x : adjList[u]) {\n if (x != p) {\n t++;\n l[x] = l[u] + 1;\n findIntervals(x, u);\n }\n }\n e[u] = t;\n }\n\n static int mod = (int) 1e9 + 7;\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter pw = new PrintWriter(System.out);\n int n = sc.nextInt();\n adjList = new ArrayList[n];\n for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n for (int i = 1; i <= n - 1; i++) {\n int p = sc.nextInt() - 1;\n adjList[i].add(p);\n adjList[p].add(i);\n }\n s = new int[n];\n e = new int[n];\n l = new int[n];\n findIntervals(0, -1);\n int N = 1;\n while (N < n) N <<= 1;\n\n SegmentTree st1 = new SegmentTree(N);\n SegmentTree st2 = new SegmentTree(N);\n int q = sc.nextInt();\n while (q-- > 0) {\n if (sc.nextInt() == 1) {\n int v = sc.nextInt() - 1;\n int x = sc.nextInt();\n int k = sc.nextInt();\n st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n st2.update_range(s[v] + 1, e[v] + 1, k);\n } else {\n int v = sc.nextInt() - 1;\n long x =\n 1l * st1.query(s[v] + 1, s[v] + 1)\n - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n while (x < 0) x += mod;\n x %= mod;\n pw.println(x);\n }\n }\n\n pw.close();\n }\n\n static class SegmentTree {\n\n int N;\n int[] sTree, lazy;\n\n SegmentTree(int N) {\n this.N = N;\n sTree = new int[N << 1];\n lazy = new int[N << 1];\n }\n\n void update_range(int i, int j, int val) {\n update_range(1, 1, N, i, j, val);\n }\n\n void update_range(int node, int b, int e, int i, int j, int val) {\n if (i > e || j < b) return;\n if (b >= i && e <= j) {\n lazy[node] += val;\n lazy[node] %= mod;\n } else {\n int mid = b + e >> 1;\n\n update_range(node << 1, b, mid, i, j, val);\n update_range(node << 1 | 1, mid + 1, e, i, j, val);\n }\n }\n\n int query(int i, int j) {\n return query(1, 1, N, i, j);\n }\n\n int query(int node, int b, int e, int i, int j) {\n\n if (i > e || j < b) return 0;\n if (b >= i && e <= j) return lazy[node];\n int mid = b + e >> 1;\n\n int q1 = query(node << 1, b, mid, i, j);\n int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n return (((q1 + q2) % mod) + lazy[node]) % mod;\n }\n }\n\n static class Scanner {\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public Scanner(FileReader r) {\n br = new BufferedReader(r);\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.text.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.math.BigInteger;\n+import java.util.ArrayList;\n \n-public class E397 {\n+public class CF_0397_E {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String[] line;\n \n- static ArrayList[] adjList;\n- static int[] s, e, l;\n- static int t = 0;\n+ line = br.readLine().split(\" \");\n+ int N = Integer.parseInt(line[0]);\n \n- public static void findIntervals(int u, int p) {\n- s[u] = t;\n- for (int x : adjList[u]) {\n- if (x != p) {\n- t++;\n- l[x] = l[u] + 1;\n- findIntervals(x, u);\n+ nexts = new ArrayList[N];\n+ for (int n = 0; n < N; n++) {\n+ nexts[n] = new ArrayList<>();\n+ }\n+ line = br.readLine().split(\" \");\n+ for (int n = 1; n < N; n++) {\n+ int a = Integer.parseInt(line[n - 1]) - 1;\n+ nexts[a].add(n);\n+ }\n+\n+ trav = new int[2 * N - 1];\n+ first = new int[N];\n+ last = new int[N];\n+ depth = new int[N];\n+\n+ createTrav(0, 0);\n+\n+ FenwickTree slope = new FenwickTree(2 * N - 1);\n+ FenwickTree sect = new FenwickTree(2 * N - 1);\n+\n+ StringBuilder sb = new StringBuilder();\n+ line = br.readLine().split(\" \");\n+ int Q = Integer.parseInt(line[0]);\n+ for (int q = 0; q < Q; q++) {\n+ line = br.readLine().split(\" \");\n+ if (line.length == 4) {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ int X = Integer.parseInt(line[2]);\n+ int K = Integer.parseInt(line[3]);\n+\n+ long qslope = K;\n+ long qsect = X + (depth[V] * (long) K);\n+ qsect %= 1_000_000_007;\n+\n+ slope.modify(first[V], qslope);\n+ slope.modify(last[V] + 1, -qslope);\n+ sect.modify(first[V], qsect);\n+ sect.modify(last[V] + 1, -qsect);\n+ } else {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ long qslope = slope.rsq(first[V]);\n+ long qsect = sect.rsq(first[V]);\n+\n+ BigInteger result =\n+ (new BigInteger(\"\" + qsect))\n+ .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n+ result = result.mod(new BigInteger(\"1000000007\"));\n+ sb.append(result.toString()).append('\\n');\n }\n }\n- e[u] = t;\n+ System.out.println(sb);\n }\n \n- static int mod = (int) 1e9 + 7;\n+ static ArrayList[] nexts;\n+ static int[] trav;\n+ static int tsize = 0;\n+ static int[] depth;\n+ static int[] first, last;\n \n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n- PrintWriter pw = new PrintWriter(System.out);\n- int n = sc.nextInt();\n- adjList = new ArrayList[n];\n- for (int i = 0; i < n; i++) adjList[i] = new ArrayList();\n- for (int i = 1; i <= n - 1; i++) {\n- int p = sc.nextInt() - 1;\n- adjList[i].add(p);\n- adjList[p].add(i);\n+ static void createTrav(int start, int dep) {\n+ trav[tsize] = start;\n+ first[start] = tsize;\n+ last[start] = tsize;\n+ depth[start] = dep;\n+ tsize++;\n+ for (int i = 0; i < nexts[start].size(); i++) {\n+ int next = nexts[start].get(i);\n+ createTrav(next, dep + 1);\n+ trav[tsize] = start;\n+ last[start] = tsize;\n+ tsize++;\n }\n- s = new int[n];\n- e = new int[n];\n- l = new int[n];\n- findIntervals(0, -1);\n- int N = 1;\n- while (N < n) N <<= 1;\n+ }\n \n- SegmentTree st1 = new SegmentTree(N);\n- SegmentTree st2 = new SegmentTree(N);\n- int q = sc.nextInt();\n- while (q-- > 0) {\n- if (sc.nextInt() == 1) {\n- int v = sc.nextInt() - 1;\n- int x = sc.nextInt();\n- int k = sc.nextInt();\n- st1.update_range(s[v] + 1, e[v] + 1, (int) ((x + 1l * k * l[v]) % mod));\n- st2.update_range(s[v] + 1, e[v] + 1, k);\n- } else {\n- int v = sc.nextInt() - 1;\n- long x =\n- 1l * st1.query(s[v] + 1, s[v] + 1)\n- - ((1l * l[v] * st2.query(s[v] + 1, s[v] + 1)) % mod);\n- while (x < 0) x += mod;\n- x %= mod;\n- pw.println(x);\n+ static class FenwickTree {\n+ long[] arr;\n+\n+ FenwickTree(int size) {\n+ arr = new long[size + 1];\n+ }\n+\n+ long rsq(int chl) {\n+ long sum = 0;\n+ do {\n+ sum += arr[chl];\n+ chl = dep(chl);\n+ } while (chl != -1);\n+ return sum;\n+ }\n+\n+ void modify(int chl, long amount) {\n+ while (chl < arr.length) {\n+ arr[chl] += amount;\n+ chl += ((~chl) & (-(~chl)));\n }\n }\n \n- pw.close();\n- }\n-\n- static class SegmentTree {\n-\n- int N;\n- int[] sTree, lazy;\n-\n- SegmentTree(int N) {\n- this.N = N;\n- sTree = new int[N << 1];\n- lazy = new int[N << 1];\n- }\n-\n- void update_range(int i, int j, int val) {\n- update_range(1, 1, N, i, j, val);\n- }\n-\n- void update_range(int node, int b, int e, int i, int j, int val) {\n- if (i > e || j < b) return;\n- if (b >= i && e <= j) {\n- lazy[node] += val;\n- lazy[node] %= mod;\n- } else {\n- int mid = b + e >> 1;\n-\n- update_range(node << 1, b, mid, i, j, val);\n- update_range(node << 1 | 1, mid + 1, e, i, j, val);\n- }\n- }\n-\n- int query(int i, int j) {\n- return query(1, 1, N, i, j);\n- }\n-\n- int query(int node, int b, int e, int i, int j) {\n-\n- if (i > e || j < b) return 0;\n- if (b >= i && e <= j) return lazy[node];\n- int mid = b + e >> 1;\n-\n- int q1 = query(node << 1, b, mid, i, j);\n- int q2 = query(node << 1 | 1, mid + 1, e, i, j);\n- return (((q1 + q2) % mod) + lazy[node]) % mod;\n- }\n- }\n-\n- static class Scanner {\n- StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public Scanner(FileReader r) {\n- br = new BufferedReader(r);\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n- return st.nextToken();\n- }\n-\n- public int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n- }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ private int dep(int a) {\n+ a++;\n+ return a - (a & (-a)) - 1;\n }\n }\n }", "output": "SLOWER 0.1982", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.1473, "pair_id": "java_2278_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n+import java.math.BigInteger;\n+import java.util.ArrayList;\n \n-public class c {\n- static int mod = 1000000007;\n- static int dec = 1;\n- static int[] depths, pre, post;\n+public class CF_0397_E {\n+ public static void main(String[] args) throws IOException {\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ String[] line;\n \n- public static void main(String[] args) throws IOException {\n- input.init(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- int n = input.nextInt();\n- depths = new int[n];\n- pre = new int[n];\n- post = new int[n];\n- g = new ArrayList[n];\n- for (int i = 0; i < n; i++) g[i] = new ArrayList();\n- for (int i = 1; i < n; i++) {\n- int p = input.nextInt() - 1;\n- depths[i] = depths[p] + 1;\n- g[p].add(i);\n+ line = br.readLine().split(\" \");\n+ int N = Integer.parseInt(line[0]);\n+\n+ nexts = new ArrayList[N];\n+ for (int n = 0; n < N; n++) {\n+ nexts[n] = new ArrayList<>();\n }\n- cnt = 0;\n- dfs(0);\n- int q = input.nextInt();\n- IT it = new IT(n);\n- for (int i = 0; i < q; i++) {\n- int type = input.nextInt();\n- if (type == 1) {\n- int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n+ line = br.readLine().split(\" \");\n+ for (int n = 1; n < N; n++) {\n+ int a = Integer.parseInt(line[n - 1]) - 1;\n+ nexts[a].add(n);\n+ }\n \n- it.add(pre[x], post[x], v, k, depths[x]);\n+ trav = new int[2 * N - 1];\n+ first = new int[N];\n+ last = new int[N];\n+ depth = new int[N];\n+\n+ createTrav(0, 0);\n+\n+ FenwickTree slope = new FenwickTree(2 * N - 1);\n+ FenwickTree sect = new FenwickTree(2 * N - 1);\n+\n+ StringBuilder sb = new StringBuilder();\n+ line = br.readLine().split(\" \");\n+ int Q = Integer.parseInt(line[0]);\n+ for (int q = 0; q < Q; q++) {\n+ line = br.readLine().split(\" \");\n+ if (line.length == 4) {\n+ int V = Integer.parseInt(line[1]) - 1;\n+ int X = Integer.parseInt(line[2]);\n+ int K = Integer.parseInt(line[3]);\n+\n+ long qslope = K;\n+ long qsect = X + (depth[V] * (long) K);\n+ qsect %= 1_000_000_007;\n+\n+ slope.modify(first[V], qslope);\n+ slope.modify(last[V] + 1, -qslope);\n+ sect.modify(first[V], qsect);\n+ sect.modify(last[V] + 1, -qsect);\n } else {\n- int x = input.nextInt() - 1;\n- int temp = x;\n- x = pre[x];\n+ int V = Integer.parseInt(line[1]) - 1;\n+ long qslope = slope.rsq(first[V]);\n+ long qsect = sect.rsq(first[V]);\n \n- long v = it.getVal(x), s = it.getSlope(x);\n-\n- long res = (v - depths[temp] * s) % mod;\n- if (res < 0) res += mod;\n- out.println(res);\n+ BigInteger result =\n+ (new BigInteger(\"\" + qsect))\n+ .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n+ result = result.mod(new BigInteger(\"1000000007\"));\n+ sb.append(result.toString()).append('\\n');\n }\n }\n- out.close();\n+ System.out.println(sb);\n }\n \n- static ArrayList[] g;\n- static int cnt;\n+ static ArrayList[] nexts;\n+ static int[] trav;\n+ static int tsize = 0;\n+ static int[] depth;\n+ static int[] first, last;\n \n- static void dfs(int at) {\n- pre[at] = cnt++;\n- for (int x : g[at]) dfs(x);\n- post[at] = cnt - 1;\n+ static void createTrav(int start, int dep) {\n+ trav[tsize] = start;\n+ first[start] = tsize;\n+ last[start] = tsize;\n+ depth[start] = dep;\n+ tsize++;\n+ for (int i = 0; i < nexts[start].size(); i++) {\n+ int next = nexts[start].get(i);\n+ createTrav(next, dep + 1);\n+ trav[tsize] = start;\n+ last[start] = tsize;\n+ tsize++;\n+ }\n }\n \n- static class IT {\n- int[] left, right, val, a, b, prop, slope, pslope;\n+ static class FenwickTree {\n+ long[] arr;\n \n- IT(int n) {\n- left = new int[4 * n];\n- right = new int[4 * n];\n- val = new int[4 * n];\n- slope = new int[4 * n];\n- prop = new int[4 * n];\n- pslope = new int[4 * n];\n- a = new int[4 * n];\n- b = new int[4 * n];\n- init(0, 0, n - 1);\n+ FenwickTree(int size) {\n+ arr = new long[size + 1];\n }\n \n- int init(int at, int l, int r) {\n- a[at] = l;\n- b[at] = r;\n- if (l == r) left[at] = right[at] = -1;\n- else {\n- int mid = (l + r) / 2;\n- left[at] = init(2 * at + 1, l, mid);\n- right[at] = init(2 * at + 2, mid + 1, r);\n- }\n- return at++;\n+ long rsq(int chl) {\n+ long sum = 0;\n+ do {\n+ sum += arr[chl];\n+ chl = dep(chl);\n+ } while (chl != -1);\n+ return sum;\n }\n \n- int getVal(int x) {\n- return go(x, x, 0);\n- }\n-\n- int getSlope(int x) {\n- return go2(x, x, 0);\n- }\n-\n- void push(int at) {\n- if (prop[at] != 0 || pslope[at] != 0) {\n- go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n- go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n- prop[at] = 0;\n- pslope[at] = 0;\n+ void modify(int chl, long amount) {\n+ while (chl < arr.length) {\n+ arr[chl] += amount;\n+ chl += ((~chl) & (-(~chl)));\n }\n }\n \n- int go(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return val[at];\n- push(at);\n- return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n- }\n-\n- int go2(int x, int y, int at) {\n- if (at == -1 || y < a[at] || x > b[at]) return 0;\n- if (x <= a[at] && y >= b[at]) return slope[at];\n- push(at);\n- return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n- }\n-\n- void add(int x, int y, int v, int k, int curDepth) {\n- go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n- }\n-\n- void go3(int x, int y, int v, int v2, int at) {\n- if (at == -1) return;\n- if (y < a[at] || x > b[at]) return;\n- x = Math.max(x, a[at]);\n- y = Math.min(y, b[at]);\n- if (y == b[at] && x == a[at]) {\n- val[at] = (val[at] + v) % mod;\n- prop[at] = (prop[at] + v) % mod;\n- slope[at] = (slope[at] + v2) % mod;\n- pslope[at] = (pslope[at] + v2) % mod;\n- return;\n- }\n- push(at);\n- go3(x, y, v, v2, left[at]);\n- go3(x, y, v, v2, right[at]);\n- }\n- }\n-\n- public static class input {\n- static BufferedReader reader;\n- static StringTokenizer tokenizer;\n-\n- static void init(InputStream input) {\n- reader = new BufferedReader(new InputStreamReader(input));\n- tokenizer = new StringTokenizer(\"\");\n- }\n-\n- static String next() throws IOException {\n- while (!tokenizer.hasMoreTokens()) {\n-\n- tokenizer = new StringTokenizer(reader.readLine());\n- }\n- return tokenizer.nextToken();\n- }\n-\n- static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static long nextLong() throws IOException {\n- return Long.parseLong(next());\n+ private int dep(int a) {\n+ a++;\n+ return a - (a & (-a)) - 1;\n }\n }\n }", "output": "FASTER 0.0837", "problem_id": "397_E", "direction": "forward", "speedup_ratio": 1.0597, "pair_id": "java_2281_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.math.BigInteger;\nimport java.util.ArrayList;\n\npublic class CF_0397_E {\n public static void main(String[] args) throws IOException {\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n String[] line;\n\n line = br.readLine().split(\" \");\n int N = Integer.parseInt(line[0]);\n\n nexts = new ArrayList[N];\n for (int n = 0; n < N; n++) {\n nexts[n] = new ArrayList<>();\n }\n line = br.readLine().split(\" \");\n for (int n = 1; n < N; n++) {\n int a = Integer.parseInt(line[n - 1]) - 1;\n nexts[a].add(n);\n }\n\n trav = new int[2 * N - 1];\n first = new int[N];\n last = new int[N];\n depth = new int[N];\n\n createTrav(0, 0);\n\n FenwickTree slope = new FenwickTree(2 * N - 1);\n FenwickTree sect = new FenwickTree(2 * N - 1);\n\n StringBuilder sb = new StringBuilder();\n line = br.readLine().split(\" \");\n int Q = Integer.parseInt(line[0]);\n for (int q = 0; q < Q; q++) {\n line = br.readLine().split(\" \");\n if (line.length == 4) {\n int V = Integer.parseInt(line[1]) - 1;\n int X = Integer.parseInt(line[2]);\n int K = Integer.parseInt(line[3]);\n\n long qslope = K;\n long qsect = X + (depth[V] * (long) K);\n qsect %= 1_000_000_007;\n\n slope.modify(first[V], qslope);\n slope.modify(last[V] + 1, -qslope);\n sect.modify(first[V], qsect);\n sect.modify(last[V] + 1, -qsect);\n } else {\n int V = Integer.parseInt(line[1]) - 1;\n long qslope = slope.rsq(first[V]);\n long qsect = sect.rsq(first[V]);\n\n BigInteger result =\n (new BigInteger(\"\" + qsect))\n .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n result = result.mod(new BigInteger(\"1000000007\"));\n sb.append(result.toString()).append('\\n');\n }\n }\n System.out.println(sb);\n }\n\n static ArrayList[] nexts;\n static int[] trav;\n static int tsize = 0;\n static int[] depth;\n static int[] first, last;\n\n static void createTrav(int start, int dep) {\n trav[tsize] = start;\n first[start] = tsize;\n last[start] = tsize;\n depth[start] = dep;\n tsize++;\n for (int i = 0; i < nexts[start].size(); i++) {\n int next = nexts[start].get(i);\n createTrav(next, dep + 1);\n trav[tsize] = start;\n last[start] = tsize;\n tsize++;\n }\n }\n\n static class FenwickTree {\n long[] arr;\n\n FenwickTree(int size) {\n arr = new long[size + 1];\n }\n\n long rsq(int chl) {\n long sum = 0;\n do {\n sum += arr[chl];\n chl = dep(chl);\n } while (chl != -1);\n return sum;\n }\n\n void modify(int chl, long amount) {\n while (chl < arr.length) {\n arr[chl] += amount;\n chl += ((~chl) & (-(~chl)));\n }\n }\n\n private int dep(int a) {\n a++;\n return a - (a & (-a)) - 1;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class c {\n static int mod = 1000000007;\n static int dec = 1;\n static int[] depths, pre, post;\n\n public static void main(String[] args) throws IOException {\n input.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n int n = input.nextInt();\n depths = new int[n];\n pre = new int[n];\n post = new int[n];\n g = new ArrayList[n];\n for (int i = 0; i < n; i++) g[i] = new ArrayList();\n for (int i = 1; i < n; i++) {\n int p = input.nextInt() - 1;\n depths[i] = depths[p] + 1;\n g[p].add(i);\n }\n cnt = 0;\n dfs(0);\n int q = input.nextInt();\n IT it = new IT(n);\n for (int i = 0; i < q; i++) {\n int type = input.nextInt();\n if (type == 1) {\n int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n\n it.add(pre[x], post[x], v, k, depths[x]);\n } else {\n int x = input.nextInt() - 1;\n int temp = x;\n x = pre[x];\n\n long v = it.getVal(x), s = it.getSlope(x);\n\n long res = (v - depths[temp] * s) % mod;\n if (res < 0) res += mod;\n out.println(res);\n }\n }\n out.close();\n }\n\n static ArrayList[] g;\n static int cnt;\n\n static void dfs(int at) {\n pre[at] = cnt++;\n for (int x : g[at]) dfs(x);\n post[at] = cnt - 1;\n }\n\n static class IT {\n int[] left, right, val, a, b, prop, slope, pslope;\n\n IT(int n) {\n left = new int[4 * n];\n right = new int[4 * n];\n val = new int[4 * n];\n slope = new int[4 * n];\n prop = new int[4 * n];\n pslope = new int[4 * n];\n a = new int[4 * n];\n b = new int[4 * n];\n init(0, 0, n - 1);\n }\n\n int init(int at, int l, int r) {\n a[at] = l;\n b[at] = r;\n if (l == r) left[at] = right[at] = -1;\n else {\n int mid = (l + r) / 2;\n left[at] = init(2 * at + 1, l, mid);\n right[at] = init(2 * at + 2, mid + 1, r);\n }\n return at++;\n }\n\n int getVal(int x) {\n return go(x, x, 0);\n }\n\n int getSlope(int x) {\n return go2(x, x, 0);\n }\n\n void push(int at) {\n if (prop[at] != 0 || pslope[at] != 0) {\n go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n prop[at] = 0;\n pslope[at] = 0;\n }\n }\n\n int go(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return val[at];\n push(at);\n return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n }\n\n int go2(int x, int y, int at) {\n if (at == -1 || y < a[at] || x > b[at]) return 0;\n if (x <= a[at] && y >= b[at]) return slope[at];\n push(at);\n return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n }\n\n void add(int x, int y, int v, int k, int curDepth) {\n go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n }\n\n void go3(int x, int y, int v, int v2, int at) {\n if (at == -1) return;\n if (y < a[at] || x > b[at]) return;\n x = Math.max(x, a[at]);\n y = Math.min(y, b[at]);\n if (y == b[at] && x == a[at]) {\n val[at] = (val[at] + v) % mod;\n prop[at] = (prop[at] + v) % mod;\n slope[at] = (slope[at] + v2) % mod;\n pslope[at] = (pslope[at] + v2) % mod;\n return;\n }\n push(at);\n go3(x, y, v, v2, left[at]);\n go3(x, y, v, v2, right[at]);\n }\n }\n\n public static class input {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) {\n\n tokenizer = new StringTokenizer(reader.readLine());\n }\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n-import java.math.BigInteger;\n-import java.util.ArrayList;\n+import java.io.*;\n+import java.util.*;\n \n-public class CF_0397_E {\n+public class c {\n+ static int mod = 1000000007;\n+ static int dec = 1;\n+ static int[] depths, pre, post;\n+\n public static void main(String[] args) throws IOException {\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n- String[] line;\n+ input.init(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ int n = input.nextInt();\n+ depths = new int[n];\n+ pre = new int[n];\n+ post = new int[n];\n+ g = new ArrayList[n];\n+ for (int i = 0; i < n; i++) g[i] = new ArrayList();\n+ for (int i = 1; i < n; i++) {\n+ int p = input.nextInt() - 1;\n+ depths[i] = depths[p] + 1;\n+ g[p].add(i);\n+ }\n+ cnt = 0;\n+ dfs(0);\n+ int q = input.nextInt();\n+ IT it = new IT(n);\n+ for (int i = 0; i < q; i++) {\n+ int type = input.nextInt();\n+ if (type == 1) {\n+ int x = input.nextInt() - 1, v = input.nextInt(), k = input.nextInt();\n \n- line = br.readLine().split(\" \");\n- int N = Integer.parseInt(line[0]);\n+ it.add(pre[x], post[x], v, k, depths[x]);\n+ } else {\n+ int x = input.nextInt() - 1;\n+ int temp = x;\n+ x = pre[x];\n \n- nexts = new ArrayList[N];\n- for (int n = 0; n < N; n++) {\n- nexts[n] = new ArrayList<>();\n+ long v = it.getVal(x), s = it.getSlope(x);\n+\n+ long res = (v - depths[temp] * s) % mod;\n+ if (res < 0) res += mod;\n+ out.println(res);\n+ }\n }\n- line = br.readLine().split(\" \");\n- for (int n = 1; n < N; n++) {\n- int a = Integer.parseInt(line[n - 1]) - 1;\n- nexts[a].add(n);\n+ out.close();\n+ }\n+\n+ static ArrayList[] g;\n+ static int cnt;\n+\n+ static void dfs(int at) {\n+ pre[at] = cnt++;\n+ for (int x : g[at]) dfs(x);\n+ post[at] = cnt - 1;\n+ }\n+\n+ static class IT {\n+ int[] left, right, val, a, b, prop, slope, pslope;\n+\n+ IT(int n) {\n+ left = new int[4 * n];\n+ right = new int[4 * n];\n+ val = new int[4 * n];\n+ slope = new int[4 * n];\n+ prop = new int[4 * n];\n+ pslope = new int[4 * n];\n+ a = new int[4 * n];\n+ b = new int[4 * n];\n+ init(0, 0, n - 1);\n }\n \n- trav = new int[2 * N - 1];\n- first = new int[N];\n- last = new int[N];\n- depth = new int[N];\n+ int init(int at, int l, int r) {\n+ a[at] = l;\n+ b[at] = r;\n+ if (l == r) left[at] = right[at] = -1;\n+ else {\n+ int mid = (l + r) / 2;\n+ left[at] = init(2 * at + 1, l, mid);\n+ right[at] = init(2 * at + 2, mid + 1, r);\n+ }\n+ return at++;\n+ }\n \n- createTrav(0, 0);\n+ int getVal(int x) {\n+ return go(x, x, 0);\n+ }\n \n- FenwickTree slope = new FenwickTree(2 * N - 1);\n- FenwickTree sect = new FenwickTree(2 * N - 1);\n+ int getSlope(int x) {\n+ return go2(x, x, 0);\n+ }\n \n- StringBuilder sb = new StringBuilder();\n- line = br.readLine().split(\" \");\n- int Q = Integer.parseInt(line[0]);\n- for (int q = 0; q < Q; q++) {\n- line = br.readLine().split(\" \");\n- if (line.length == 4) {\n- int V = Integer.parseInt(line[1]) - 1;\n- int X = Integer.parseInt(line[2]);\n- int K = Integer.parseInt(line[3]);\n-\n- long qslope = K;\n- long qsect = X + (depth[V] * (long) K);\n- qsect %= 1_000_000_007;\n-\n- slope.modify(first[V], qslope);\n- slope.modify(last[V] + 1, -qslope);\n- sect.modify(first[V], qsect);\n- sect.modify(last[V] + 1, -qsect);\n- } else {\n- int V = Integer.parseInt(line[1]) - 1;\n- long qslope = slope.rsq(first[V]);\n- long qsect = sect.rsq(first[V]);\n-\n- BigInteger result =\n- (new BigInteger(\"\" + qsect))\n- .subtract((new BigInteger(\"\" + depth[V])).multiply(new BigInteger(\"\" + qslope)));\n- result = result.mod(new BigInteger(\"1000000007\"));\n- sb.append(result.toString()).append('\\n');\n+ void push(int at) {\n+ if (prop[at] != 0 || pslope[at] != 0) {\n+ go3(a[left[at]], b[left[at]], prop[at], pslope[at], left[at]);\n+ go3(a[right[at]], b[right[at]], prop[at], pslope[at], right[at]);\n+ prop[at] = 0;\n+ pslope[at] = 0;\n }\n }\n- System.out.println(sb);\n- }\n \n- static ArrayList[] nexts;\n- static int[] trav;\n- static int tsize = 0;\n- static int[] depth;\n- static int[] first, last;\n+ int go(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return val[at];\n+ push(at);\n+ return (go(x, y, left[at]) + go(x, y, right[at])) % mod;\n+ }\n \n- static void createTrav(int start, int dep) {\n- trav[tsize] = start;\n- first[start] = tsize;\n- last[start] = tsize;\n- depth[start] = dep;\n- tsize++;\n- for (int i = 0; i < nexts[start].size(); i++) {\n- int next = nexts[start].get(i);\n- createTrav(next, dep + 1);\n- trav[tsize] = start;\n- last[start] = tsize;\n- tsize++;\n+ int go2(int x, int y, int at) {\n+ if (at == -1 || y < a[at] || x > b[at]) return 0;\n+ if (x <= a[at] && y >= b[at]) return slope[at];\n+ push(at);\n+ return (go2(x, y, left[at]) + go2(x, y, right[at])) % mod;\n+ }\n+\n+ void add(int x, int y, int v, int k, int curDepth) {\n+ go3(x, y, (int) ((v + (long) k * curDepth) % mod), k, 0);\n+ }\n+\n+ void go3(int x, int y, int v, int v2, int at) {\n+ if (at == -1) return;\n+ if (y < a[at] || x > b[at]) return;\n+ x = Math.max(x, a[at]);\n+ y = Math.min(y, b[at]);\n+ if (y == b[at] && x == a[at]) {\n+ val[at] = (val[at] + v) % mod;\n+ prop[at] = (prop[at] + v) % mod;\n+ slope[at] = (slope[at] + v2) % mod;\n+ pslope[at] = (pslope[at] + v2) % mod;\n+ return;\n+ }\n+ push(at);\n+ go3(x, y, v, v2, left[at]);\n+ go3(x, y, v, v2, right[at]);\n }\n }\n \n- static class FenwickTree {\n- long[] arr;\n+ public static class input {\n+ static BufferedReader reader;\n+ static StringTokenizer tokenizer;\n \n- FenwickTree(int size) {\n- arr = new long[size + 1];\n+ static void init(InputStream input) {\n+ reader = new BufferedReader(new InputStreamReader(input));\n+ tokenizer = new StringTokenizer(\"\");\n }\n \n- long rsq(int chl) {\n- long sum = 0;\n- do {\n- sum += arr[chl];\n- chl = dep(chl);\n- } while (chl != -1);\n- return sum;\n+ static String next() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) {\n+\n+ tokenizer = new StringTokenizer(reader.readLine());\n+ }\n+ return tokenizer.nextToken();\n }\n \n- void modify(int chl, long amount) {\n- while (chl < arr.length) {\n- arr[chl] += amount;\n- chl += ((~chl) & (-(~chl)));\n- }\n+ static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n }\n \n- private int dep(int a) {\n- a++;\n- return a - (a & (-a)) - 1;\n+ static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 0.0837", "problem_id": "397_E", "direction": "reversed", "speedup_ratio": 1.0597, "pair_id": "java_2281_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n+import java.io.*;\n import java.util.*;\n \n-class LazySegTree {\n- final int MAX;\n-\n- final int N;\n- final int Log;\n- final java.util.function.BinaryOperator Op;\n- final S E;\n- final java.util.function.BiFunction Mapping;\n- final java.util.function.BinaryOperator Composition;\n- final F Id;\n-\n- final S[] Dat;\n- final F[] Laz;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this.MAX = n;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.Log = Integer.numberOfTrailingZeros(N);\n- this.Op = op;\n- this.E = e;\n- this.Mapping = mapping;\n- this.Composition = composition;\n- this.Id = id;\n- this.Dat = (S[]) new Object[N << 1];\n- this.Laz = (F[]) new Object[N];\n- java.util.Arrays.fill(Dat, E);\n- java.util.Arrays.fill(Laz, Id);\n- }\n-\n- public LazySegTree(\n- S[] dat,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this(dat.length, op, e, mapping, composition, id);\n- build(dat);\n- }\n-\n- private void build(S[] dat) {\n- int l = dat.length;\n- System.arraycopy(dat, 0, Dat, N, l);\n- for (int i = N - 1; i > 0; i--) {\n- Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n- }\n- }\n-\n- private void push(int k) {\n- if (Laz[k] == Id) return;\n- int lk = k << 1 | 0, rk = k << 1 | 1;\n- Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n- Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n- if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n- if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n- Laz[k] = Id;\n- }\n-\n- private void pushTo(int k) {\n- for (int i = Log; i > 0; i--) push(k >> i);\n- }\n-\n- private void pushTo(int lk, int rk) {\n- for (int i = Log; i > 0; i--) {\n- if (((lk >> i) << i) != lk) push(lk >> i);\n- if (((rk >> i) << i) != rk) push(rk >> i);\n- }\n- }\n-\n- private void updateFrom(int k) {\n- k >>= 1;\n- while (k > 0) {\n- Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n- k >>= 1;\n- }\n- }\n-\n- private void updateFrom(int lk, int rk) {\n- for (int i = 1; i <= Log; i++) {\n- if (((lk >> i) << i) != lk) {\n- int lki = lk >> i;\n- Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n- }\n- if (((rk >> i) << i) != rk) {\n- int rki = (rk - 1) >> i;\n- Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n- }\n+class Count {\n+ final long count0, count1, count01, count10;\n+\n+ Count(long count0, long count1, long count01, long count10) {\n+ this.count0 = count0;\n+ this.count1 = count1;\n+ this.count01 = count01;\n+ this.count10 = count10;\n+ }\n+\n+ Count flip() {\n+ return new Count(count1, count0, count10, count01);\n+ }\n+}\n+\n+public class Main {\n+ private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n+\n+ private static LazySegmentTree.Operator OPERATOR =\n+ new LazySegmentTree.Operator<>() {\n+ @Override\n+ public Count e() {\n+ return COUNT_EMPTY;\n+ }\n+\n+ @Override\n+ public Boolean id() {\n+ return Boolean.valueOf(true);\n+ }\n+\n+ @Override\n+ public Count mapping(Boolean lazyValue, Count value, int count) {\n+ if (lazyValue) {\n+ return value;\n+ }\n+ return value.flip();\n+ }\n+\n+ @Override\n+ public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n+ return newLazy == oldLazy;\n+ }\n+\n+ @Override\n+ public Count op(Count smallIndexValue, Count largeIndexValue) {\n+ long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n+ long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n+ long count01 =\n+ smallIndexValue.count01\n+ + largeIndexValue.count01\n+ + smallIndexValue.count0 * largeIndexValue.count1;\n+ long count10 =\n+ smallIndexValue.count10\n+ + largeIndexValue.count10\n+ + smallIndexValue.count1 * largeIndexValue.count0;\n+ return new Count(count0, count1, count01, count10);\n+ }\n+ };\n+\n+ private static List solve(int n, int q, int[] as, int[][] tlrs) {\n+ Count[] counts = new Count[n];\n+ for (int i = 0; i < n; i++) {\n+ counts[i] = new Count(1 - as[i], as[i], 0, 0);\n+ }\n+ LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n+ List answers = new ArrayList<>();\n+ for (int[] tlr : tlrs) {\n+ int t = tlr[0];\n+ int l = tlr[1] - 1;\n+ int r = tlr[2];\n+ if (t == 1) {\n+ segmentTree.apply(l, r, Boolean.valueOf(false));\n+ } else {\n+ answers.add(segmentTree.prod(l, r).count10);\n+ }\n+ }\n+ return answers;\n+ }\n+\n+ private static void execute(ContestReader reader, ContestWriter out) {\n+ int n = reader.nextInt();\n+ int q = reader.nextInt();\n+ int[] as = reader.nextInt(n);\n+ int[][] tlrs = reader.nextInt(q, 3);\n+ out.printList(solve(n, q, as, tlrs));\n+ }\n+\n+ public static void main(String[] args) {\n+ ContestReader reader = new ContestReader(System.in);\n+ ContestWriter out = new ContestWriter(System.out);\n+ execute(reader, out);\n+ out.flush();\n+ }\n+}\n+\n+class ContestWriter extends PrintWriter {\n+ ContestWriter(PrintStream printStream) {\n+ super(printStream);\n+ }\n+\n+ public void printList(List list) {\n+ for (Object object : list) {\n+ println(object);\n+ }\n+ }\n+\n+ public void printListOneLine(List list) {\n+ List stringList = new ArrayList<>();\n+ for (Object object : list) {\n+ stringList.add(object.toString());\n+ }\n+ println(String.join(\" \", stringList));\n+ }\n+}\n+\n+class LazySegmentTree {\n+ public interface Operator {\n+ S e();\n+\n+ F id();\n+\n+ S mapping(F lazyValue, S value, int count);\n+\n+ F composition(F newLazy, F oldLazy);\n+\n+ S op(S smallIndexValue, S largeIndexValue);\n+ }\n+\n+ private final Operator operator;\n+ private final int n, log, size;\n+ private final S[] d;\n+ private final F[] lz;\n+\n+ private static int ceil_pow2(int n) {\n+ int x = 0;\n+ while ((1 << x) < n) {\n+ x++;\n+ }\n+ return x;\n+ }\n+\n+ public LazySegmentTree(Operator operator, S[] v) {\n+ this.operator = operator;\n+ this.n = v.length;\n+ this.log = ceil_pow2(n);\n+ this.size = 1 << log;\n+ this.d = (S[]) new Object[2 * size];\n+ Arrays.fill(this.d, this.operator.e());\n+ this.lz = (F[]) new Object[size];\n+ Arrays.fill(this.lz, this.operator.id());\n+ for (int i = 0; i < n; i++) {\n+ this.d[size + i] = v[i];\n+ }\n+ for (int i = size - 1; i >= 1; i--) {\n+ update(i);\n }\n }\n \n public void set(int p, S x) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = x;\n- updateFrom(p);\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = x;\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n }\n \n public S get(int p) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- return Dat[p];\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ return d[p];\n }\n \n public S prod(int l, int r) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return E;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- S sumLeft = E, sumRight = E;\n+\n+ if (l == r) {\n+ operator.e();\n+ }\n+ l += size;\n+ r += size;\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push(r >> i);\n+ }\n+ }\n+ S lValue = operator.e();\n+ S rValue = operator.e();\n while (l < r) {\n- if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n- if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n+ if ((l & 1) == 1) {\n+ lValue = operator.op(lValue, d[l]);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ rValue = operator.op(d[r], rValue);\n+ }\n l >>= 1;\n r >>= 1;\n }\n- return Op.apply(sumLeft, sumRight);\n+ return operator.op(lValue, rValue);\n }\n \n public S allProd() {\n- return Dat[1];\n+ return d[1];\n }\n \n public void apply(int p, F f) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = Mapping.apply(f, Dat[p]);\n- updateFrom(p);\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = operator.mapping(f, d[p], 1);\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n }\n \n public void apply(int l, int r, F f) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- for (int l2 = l, r2 = r; l2 < r2; ) {\n- if ((l2 & 1) == 1) {\n- Dat[l2] = Mapping.apply(f, Dat[l2]);\n- if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n- l2++;\n- }\n- if ((r2 & 1) == 1) {\n- r2--;\n- Dat[r2] = Mapping.apply(f, Dat[r2]);\n- if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n- }\n- l2 >>= 1;\n- r2 >>= 1;\n- }\n- updateFrom(l, r);\n- }\n-\n- public int maxRight(int l, java.util.function.Predicate g) {\n- inclusiveRangeCheck(l);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (l == MAX) return MAX;\n- l += N;\n- pushTo(l);\n- S sum = E;\n- do {\n- l >>= Integer.numberOfTrailingZeros(l);\n- if (!g.test(Op.apply(sum, Dat[l]))) {\n- while (l < N) {\n- push(l);\n- l = l << 1;\n- if (g.test(Op.apply(sum, Dat[l]))) {\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- }\n- }\n- return l - N;\n- }\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- } while ((l & -l) != l);\n- return MAX;\n- }\n-\n- public int minLeft(int r, java.util.function.Predicate g) {\n- inclusiveRangeCheck(r);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (r == 0) return 0;\n- r += N;\n- pushTo(r - 1);\n- S sum = E;\n- do {\n- r--;\n- while (r > 1 && (r & 1) == 1) r >>= 1;\n- if (!g.test(Op.apply(Dat[r], sum))) {\n- while (r < N) {\n- push(r);\n- r = r << 1 | 1;\n- if (g.test(Op.apply(Dat[r], sum))) {\n- sum = Op.apply(Dat[r], sum);\n- r--;\n- }\n- }\n- return r + 1 - N;\n- }\n- sum = Op.apply(Dat[r], sum);\n- } while ((r & -r) != r);\n- return 0;\n- }\n-\n- private void exclusiveRangeCheck(int p) {\n- if (p < 0 || p >= MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n- }\n- }\n-\n- private void inclusiveRangeCheck(int p) {\n- if (p < 0 || p > MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n- }\n+\n+ if (l == r) {\n+ return;\n+ }\n+\n+ l += size;\n+ r += size;\n+\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push((r - 1) >> i);\n+ }\n+ }\n+\n+ {\n+ int l2 = l;\n+ int r2 = r;\n+ while (l < r) {\n+ if ((l & 1) == 1) {\n+ allApply(l, f);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ allApply(r, f);\n+ }\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ l = l2;\n+ r = r2;\n+ }\n+\n+ for (int i = 1; i <= log; i++) {\n+ if (((l >> i) << i) != l) {\n+ update(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ update((r - 1) >> i);\n+ }\n+ }\n+ }\n+\n+ private void update(int k) {\n+ d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n+ }\n+\n+ private void allApply(int k, F f) {\n+ int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n+\n+ d[k] = this.operator.mapping(f, d[k], count);\n+ if (k < size) {\n+ lz[k] = this.operator.composition(f, lz[k]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ allApply(2 * k, lz[k]);\n+ allApply(2 * k + 1, lz[k]);\n+ lz[k] = this.operator.id();\n }\n }\n \n-public class Main {\n- private static class S {\n- long zero;\n- long one;\n- long inv;\n-\n- public S(long zero, long one, long inv) {\n- this.zero = zero;\n- this.one = one;\n- this.inv = inv;\n- }\n-\n- S swap01() {\n- return new S(this.one, this.zero, this.zero * this.one - this.inv);\n- }\n-\n- static S connect(S a, S b) {\n- return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n- }\n- }\n-\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- int Q = sc.nextInt();\n-\n- S[] A = new S[N + 1];\n- A[0] = new S(0, 0, 0);\n- for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n-\n- LazySegTree seg =\n- new LazySegTree(\n- A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n-\n- for (int q = 0; q < Q; q++) {\n- int t = sc.nextInt();\n- if (t == 1) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- seg.apply(l, r + 1, true);\n- } else if (t == 2) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- System.out.println(seg.prod(l, r + 1).inv);\n- }\n- }\n+class ContestReader {\n+ private static final int BUFFER_SIZE = 1024;\n+\n+ private final InputStream stream;\n+ private final byte[] buffer;\n+ private int pointer;\n+ private int bufferLength;\n+\n+ ContestReader(InputStream stream) {\n+ this.stream = stream;\n+ this.buffer = new byte[BUFFER_SIZE];\n+ this.pointer = 0;\n+ this.bufferLength = 0;\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (pointer < bufferLength) {\n+ return true;\n+ }\n+\n+ pointer = 0;\n+ try {\n+ bufferLength = stream.read(buffer);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ return bufferLength > 0;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) {\n+ return buffer[pointer++];\n+ } else {\n+ return -1;\n+ }\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n+ pointer++;\n+ }\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b)) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public String nextLine() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b) && b != 0x20) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public char nextChar() {\n+ return next().charAt(0);\n+ }\n+\n+ public int nextInt() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ int n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ long n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String[] next(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = next();\n+ }\n+ return array;\n+ }\n+\n+ public String[] nextLine(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLine();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextChar(int n) {\n+ char[] array = new char[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextChar();\n+ }\n+ return array;\n+ }\n+\n+ public int[] nextInt(int n) {\n+ int[] array = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextInt();\n+ }\n+ return array;\n+ }\n+\n+ public long[] nextLong(int n) {\n+ long[] array = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLong();\n+ }\n+ return array;\n+ }\n+\n+ public double[] nextDouble(int n) {\n+ double[] array = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextDouble();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextCharArray() {\n+ return next().toCharArray();\n+ }\n+\n+ public String[][] next(int n, int m) {\n+ String[][] matrix = new String[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = next();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public int[][] nextInt(int n, int m) {\n+ int[][] matrix = new int[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextInt();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextChar(int n, int m) {\n+ char[][] matrix = new char[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextChar();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public long[][] nextLong(int n, int m) {\n+ long[][] matrix = new long[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextLong();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public double[][] nextDouble(int n, int m) {\n+ double[][] matrix = new double[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextDouble();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextCharArray(int n) {\n+ char[][] matrix = new char[n][];\n+ for (int i = 0; i < n; i++) {\n+ matrix[i] = next().toCharArray();\n+ }\n+ return matrix;\n }\n }\n+\n+class MyAssert {\n+ public static void myAssert(boolean flag, String message) {\n+ if (!flag) {\n+ throw new RuntimeException(message);\n+ }\n+ }\n+\n+ public static void myAssert(boolean flag) {\n+ myAssert(flag, \"\");\n+ }\n+}", "output": "FASTER 0.8632", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.8191, "pair_id": "java_2845_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n import java.util.*;\n \n-class Count {\n- final long count0, count1, count01, count10;\n-\n- Count(long count0, long count1, long count01, long count10) {\n- this.count0 = count0;\n- this.count1 = count1;\n- this.count01 = count01;\n- this.count10 = count10;\n- }\n-\n- Count flip() {\n- return new Count(count1, count0, count10, count01);\n- }\n-}\n-\n-public class Main {\n- private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n-\n- private static LazySegmentTree.Operator OPERATOR =\n- new LazySegmentTree.Operator<>() {\n- @Override\n- public Count e() {\n- return COUNT_EMPTY;\n- }\n-\n- @Override\n- public Boolean id() {\n- return Boolean.valueOf(true);\n- }\n-\n- @Override\n- public Count mapping(Boolean lazyValue, Count value, int count) {\n- if (lazyValue) {\n- return value;\n- }\n- return value.flip();\n- }\n-\n- @Override\n- public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n- return newLazy == oldLazy;\n- }\n-\n- @Override\n- public Count op(Count smallIndexValue, Count largeIndexValue) {\n- long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n- long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n- long count01 =\n- smallIndexValue.count01\n- + largeIndexValue.count01\n- + smallIndexValue.count0 * largeIndexValue.count1;\n- long count10 =\n- smallIndexValue.count10\n- + largeIndexValue.count10\n- + smallIndexValue.count1 * largeIndexValue.count0;\n- return new Count(count0, count1, count01, count10);\n- }\n- };\n-\n- private static List solve(int n, int q, int[] as, int[][] tlrs) {\n- Count[] counts = new Count[n];\n- for (int i = 0; i < n; i++) {\n- counts[i] = new Count(1 - as[i], as[i], 0, 0);\n- }\n- LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n- List answers = new ArrayList<>();\n- for (int[] tlr : tlrs) {\n- int t = tlr[0];\n- int l = tlr[1] - 1;\n- int r = tlr[2];\n- if (t == 1) {\n- segmentTree.apply(l, r, Boolean.valueOf(false));\n- } else {\n- answers.add(segmentTree.prod(l, r).count10);\n- }\n- }\n- return answers;\n- }\n-\n- private static void execute(ContestReader reader, ContestWriter out) {\n- int n = reader.nextInt();\n- int q = reader.nextInt();\n- int[] as = reader.nextInt(n);\n- int[][] tlrs = reader.nextInt(q, 3);\n- out.printList(solve(n, q, as, tlrs));\n- }\n-\n- public static void main(String[] args) {\n- ContestReader reader = new ContestReader(System.in);\n- ContestWriter out = new ContestWriter(System.out);\n- execute(reader, out);\n- out.flush();\n- }\n-}\n-\n-class ContestWriter extends PrintWriter {\n- ContestWriter(PrintStream printStream) {\n- super(printStream);\n- }\n-\n- public void printList(List list) {\n- for (Object object : list) {\n- println(object);\n- }\n- }\n-\n- public void printListOneLine(List list) {\n- List stringList = new ArrayList<>();\n- for (Object object : list) {\n- stringList.add(object.toString());\n- }\n- println(String.join(\" \", stringList));\n- }\n-}\n-\n-class LazySegmentTree {\n- public interface Operator {\n- S e();\n-\n- F id();\n-\n- S mapping(F lazyValue, S value, int count);\n-\n- F composition(F newLazy, F oldLazy);\n-\n- S op(S smallIndexValue, S largeIndexValue);\n- }\n-\n- private final Operator operator;\n- private final int n, log, size;\n- private final S[] d;\n- private final F[] lz;\n-\n- private static int ceil_pow2(int n) {\n- int x = 0;\n- while ((1 << x) < n) {\n- x++;\n- }\n- return x;\n- }\n-\n- public LazySegmentTree(Operator operator, S[] v) {\n- this.operator = operator;\n- this.n = v.length;\n- this.log = ceil_pow2(n);\n- this.size = 1 << log;\n- this.d = (S[]) new Object[2 * size];\n- Arrays.fill(this.d, this.operator.e());\n- this.lz = (F[]) new Object[size];\n- Arrays.fill(this.lz, this.operator.id());\n- for (int i = 0; i < n; i++) {\n- this.d[size + i] = v[i];\n- }\n- for (int i = size - 1; i >= 1; i--) {\n- update(i);\n+class LazySegTree {\n+ final int MAX;\n+\n+ final int N;\n+ final int Log;\n+ final java.util.function.BinaryOperator Op;\n+ final S E;\n+ final java.util.function.BiFunction Mapping;\n+ final java.util.function.BinaryOperator Composition;\n+ final F Id;\n+\n+ final S[] Dat;\n+ final F[] Laz;\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this.MAX = n;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.Log = Integer.numberOfTrailingZeros(N);\n+ this.Op = op;\n+ this.E = e;\n+ this.Mapping = mapping;\n+ this.Composition = composition;\n+ this.Id = id;\n+ this.Dat = (S[]) new Object[N << 1];\n+ this.Laz = (F[]) new Object[N];\n+ java.util.Arrays.fill(Dat, E);\n+ java.util.Arrays.fill(Laz, Id);\n+ }\n+\n+ public LazySegTree(\n+ S[] dat,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this(dat.length, op, e, mapping, composition, id);\n+ build(dat);\n+ }\n+\n+ private void build(S[] dat) {\n+ int l = dat.length;\n+ System.arraycopy(dat, 0, Dat, N, l);\n+ for (int i = N - 1; i > 0; i--) {\n+ Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ if (Laz[k] == Id) return;\n+ int lk = k << 1 | 0, rk = k << 1 | 1;\n+ Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n+ Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n+ if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n+ if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n+ Laz[k] = Id;\n+ }\n+\n+ private void pushTo(int k) {\n+ for (int i = Log; i > 0; i--) push(k >> i);\n+ }\n+\n+ private void pushTo(int lk, int rk) {\n+ for (int i = Log; i > 0; i--) {\n+ if (((lk >> i) << i) != lk) push(lk >> i);\n+ if (((rk >> i) << i) != rk) push(rk >> i);\n+ }\n+ }\n+\n+ private void updateFrom(int k) {\n+ k >>= 1;\n+ while (k > 0) {\n+ Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n+ k >>= 1;\n+ }\n+ }\n+\n+ private void updateFrom(int lk, int rk) {\n+ for (int i = 1; i <= Log; i++) {\n+ if (((lk >> i) << i) != lk) {\n+ int lki = lk >> i;\n+ Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n+ }\n+ if (((rk >> i) << i) != rk) {\n+ int rki = (rk - 1) >> i;\n+ Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n+ }\n }\n }\n \n public void set(int p, S x) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = x;\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = x;\n+ updateFrom(p);\n }\n \n public S get(int p) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- return d[p];\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ return Dat[p];\n }\n \n public S prod(int l, int r) {\n-\n- if (l == r) {\n- operator.e();\n- }\n- l += size;\n- r += size;\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push(r >> i);\n- }\n- }\n- S lValue = operator.e();\n- S rValue = operator.e();\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return E;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ S sumLeft = E, sumRight = E;\n while (l < r) {\n- if ((l & 1) == 1) {\n- lValue = operator.op(lValue, d[l]);\n- l++;\n- }\n- if ((r & 1) == 1) {\n- r--;\n- rValue = operator.op(d[r], rValue);\n- }\n+ if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n+ if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n- return operator.op(lValue, rValue);\n+ return Op.apply(sumLeft, sumRight);\n }\n \n public S allProd() {\n- return d[1];\n+ return Dat[1];\n }\n \n public void apply(int p, F f) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = operator.mapping(f, d[p], 1);\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = Mapping.apply(f, Dat[p]);\n+ updateFrom(p);\n }\n \n public void apply(int l, int r, F f) {\n-\n- if (l == r) {\n- return;\n- }\n-\n- l += size;\n- r += size;\n-\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push((r - 1) >> i);\n- }\n- }\n-\n- {\n- int l2 = l;\n- int r2 = r;\n- while (l < r) {\n- if ((l & 1) == 1) {\n- allApply(l, f);\n- l++;\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ for (int l2 = l, r2 = r; l2 < r2; ) {\n+ if ((l2 & 1) == 1) {\n+ Dat[l2] = Mapping.apply(f, Dat[l2]);\n+ if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n+ l2++;\n+ }\n+ if ((r2 & 1) == 1) {\n+ r2--;\n+ Dat[r2] = Mapping.apply(f, Dat[r2]);\n+ if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n+ }\n+ l2 >>= 1;\n+ r2 >>= 1;\n+ }\n+ updateFrom(l, r);\n+ }\n+\n+ public int maxRight(int l, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(l);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (l == MAX) return MAX;\n+ l += N;\n+ pushTo(l);\n+ S sum = E;\n+ do {\n+ l >>= Integer.numberOfTrailingZeros(l);\n+ if (!g.test(Op.apply(sum, Dat[l]))) {\n+ while (l < N) {\n+ push(l);\n+ l = l << 1;\n+ if (g.test(Op.apply(sum, Dat[l]))) {\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ }\n }\n- if ((r & 1) == 1) {\n- r--;\n- allApply(r, f);\n+ return l - N;\n+ }\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ } while ((l & -l) != l);\n+ return MAX;\n+ }\n+\n+ public int minLeft(int r, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(r);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (r == 0) return 0;\n+ r += N;\n+ pushTo(r - 1);\n+ S sum = E;\n+ do {\n+ r--;\n+ while (r > 1 && (r & 1) == 1) r >>= 1;\n+ if (!g.test(Op.apply(Dat[r], sum))) {\n+ while (r < N) {\n+ push(r);\n+ r = r << 1 | 1;\n+ if (g.test(Op.apply(Dat[r], sum))) {\n+ sum = Op.apply(Dat[r], sum);\n+ r--;\n+ }\n }\n- l >>= 1;\n- r >>= 1;\n- }\n- l = l2;\n- r = r2;\n- }\n-\n- for (int i = 1; i <= log; i++) {\n- if (((l >> i) << i) != l) {\n- update(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- update((r - 1) >> i);\n- }\n- }\n- }\n-\n- private void update(int k) {\n- d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n- }\n-\n- private void allApply(int k, F f) {\n- int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n-\n- d[k] = this.operator.mapping(f, d[k], count);\n- if (k < size) {\n- lz[k] = this.operator.composition(f, lz[k]);\n- }\n- }\n-\n- private void push(int k) {\n- allApply(2 * k, lz[k]);\n- allApply(2 * k + 1, lz[k]);\n- lz[k] = this.operator.id();\n+ return r + 1 - N;\n+ }\n+ sum = Op.apply(Dat[r], sum);\n+ } while ((r & -r) != r);\n+ return 0;\n+ }\n+\n+ private void exclusiveRangeCheck(int p) {\n+ if (p < 0 || p >= MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n+ }\n+ }\n+\n+ private void inclusiveRangeCheck(int p) {\n+ if (p < 0 || p > MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n+ }\n }\n }\n \n-class ContestReader {\n- private static final int BUFFER_SIZE = 1024;\n-\n- private final InputStream stream;\n- private final byte[] buffer;\n- private int pointer;\n- private int bufferLength;\n-\n- ContestReader(InputStream stream) {\n- this.stream = stream;\n- this.buffer = new byte[BUFFER_SIZE];\n- this.pointer = 0;\n- this.bufferLength = 0;\n- }\n-\n- private boolean hasNextByte() {\n- if (pointer < bufferLength) {\n- return true;\n- }\n-\n- pointer = 0;\n- try {\n- bufferLength = stream.read(buffer);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- return bufferLength > 0;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) {\n- return buffer[pointer++];\n- } else {\n- return -1;\n- }\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n- pointer++;\n- }\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b)) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public String nextLine() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b) && b != 0x20) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public char nextChar() {\n- return next().charAt(0);\n- }\n-\n- public int nextInt() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- int n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- long n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String[] next(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = next();\n- }\n- return array;\n- }\n-\n- public String[] nextLine(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLine();\n- }\n- return array;\n- }\n-\n- public char[] nextChar(int n) {\n- char[] array = new char[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextChar();\n- }\n- return array;\n- }\n-\n- public int[] nextInt(int n) {\n- int[] array = new int[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextInt();\n- }\n- return array;\n- }\n-\n- public long[] nextLong(int n) {\n- long[] array = new long[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLong();\n- }\n- return array;\n- }\n-\n- public double[] nextDouble(int n) {\n- double[] array = new double[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextDouble();\n- }\n- return array;\n- }\n-\n- public char[] nextCharArray() {\n- return next().toCharArray();\n- }\n-\n- public String[][] next(int n, int m) {\n- String[][] matrix = new String[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = next();\n- }\n- }\n- return matrix;\n- }\n-\n- public int[][] nextInt(int n, int m) {\n- int[][] matrix = new int[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextInt();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextChar(int n, int m) {\n- char[][] matrix = new char[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextChar();\n- }\n- }\n- return matrix;\n- }\n-\n- public long[][] nextLong(int n, int m) {\n- long[][] matrix = new long[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextLong();\n- }\n- }\n- return matrix;\n- }\n-\n- public double[][] nextDouble(int n, int m) {\n- double[][] matrix = new double[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextDouble();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextCharArray(int n) {\n- char[][] matrix = new char[n][];\n- for (int i = 0; i < n; i++) {\n- matrix[i] = next().toCharArray();\n- }\n- return matrix;\n+public class Main {\n+ private static class S {\n+ long zero;\n+ long one;\n+ long inv;\n+\n+ public S(long zero, long one, long inv) {\n+ this.zero = zero;\n+ this.one = one;\n+ this.inv = inv;\n+ }\n+\n+ S swap01() {\n+ return new S(this.one, this.zero, this.zero * this.one - this.inv);\n+ }\n+\n+ static S connect(S a, S b) {\n+ return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n+ }\n+ }\n+\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ int Q = sc.nextInt();\n+\n+ S[] A = new S[N + 1];\n+ A[0] = new S(0, 0, 0);\n+ for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n+\n+ LazySegTree seg =\n+ new LazySegTree(\n+ A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n+\n+ for (int q = 0; q < Q; q++) {\n+ int t = sc.nextInt();\n+ if (t == 1) {\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ seg.apply(l, r + 1, true);\n+ } else if (t == 2) {\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ System.out.println(seg.prod(l, r + 1).inv);\n+ }\n+ }\n }\n }\n-\n-class MyAssert {\n- public static void myAssert(boolean flag, String message) {\n- if (!flag) {\n- throw new RuntimeException(message);\n- }\n- }\n-\n- public static void myAssert(boolean flag) {\n- myAssert(flag, \"\");\n- }\n-}", "output": "SLOWER 0.8632", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.8191, "pair_id": "java_2845_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-class LazySegTree {\n- final int MAX;\n-\n- final int N;\n- final int Log;\n- final java.util.function.BinaryOperator Op;\n- final S E;\n- final java.util.function.BiFunction Mapping;\n- final java.util.function.BinaryOperator Composition;\n- final F Id;\n-\n- final S[] Dat;\n- final F[] Laz;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this.MAX = n;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.Log = Integer.numberOfTrailingZeros(N);\n- this.Op = op;\n- this.E = e;\n- this.Mapping = mapping;\n- this.Composition = composition;\n- this.Id = id;\n- this.Dat = (S[]) new Object[N << 1];\n- this.Laz = (F[]) new Object[N];\n- java.util.Arrays.fill(Dat, E);\n- java.util.Arrays.fill(Laz, Id);\n- }\n-\n- public LazySegTree(\n- S[] dat,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this(dat.length, op, e, mapping, composition, id);\n- build(dat);\n- }\n-\n- private void build(S[] dat) {\n- int l = dat.length;\n- System.arraycopy(dat, 0, Dat, N, l);\n- for (int i = N - 1; i > 0; i--) {\n- Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n- }\n- }\n-\n- private void push(int k) {\n- if (Laz[k] == Id) return;\n- int lk = k << 1 | 0, rk = k << 1 | 1;\n- Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n- Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n- if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n- if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n- Laz[k] = Id;\n- }\n-\n- private void pushTo(int k) {\n- for (int i = Log; i > 0; i--) push(k >> i);\n- }\n-\n- private void pushTo(int lk, int rk) {\n- for (int i = Log; i > 0; i--) {\n- if (((lk >> i) << i) != lk) push(lk >> i);\n- if (((rk >> i) << i) != rk) push(rk >> i);\n- }\n- }\n-\n- private void updateFrom(int k) {\n- k >>= 1;\n- while (k > 0) {\n- Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n- k >>= 1;\n- }\n- }\n-\n- private void updateFrom(int lk, int rk) {\n- for (int i = 1; i <= Log; i++) {\n- if (((lk >> i) << i) != lk) {\n- int lki = lk >> i;\n- Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n- }\n- if (((rk >> i) << i) != rk) {\n- int rki = (rk - 1) >> i;\n- Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n- }\n- }\n- }\n-\n- public void set(int p, S x) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = x;\n- updateFrom(p);\n- }\n-\n- public S get(int p) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- return Dat[p];\n- }\n-\n- public S prod(int l, int r) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return E;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- S sumLeft = E, sumRight = E;\n- while (l < r) {\n- if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n- if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n- l >>= 1;\n- r >>= 1;\n- }\n- return Op.apply(sumLeft, sumRight);\n- }\n-\n- public S allProd() {\n- return Dat[1];\n- }\n-\n- public void apply(int p, F f) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = Mapping.apply(f, Dat[p]);\n- updateFrom(p);\n- }\n-\n- public void apply(int l, int r, F f) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- for (int l2 = l, r2 = r; l2 < r2; ) {\n- if ((l2 & 1) == 1) {\n- Dat[l2] = Mapping.apply(f, Dat[l2]);\n- if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n- l2++;\n- }\n- if ((r2 & 1) == 1) {\n- r2--;\n- Dat[r2] = Mapping.apply(f, Dat[r2]);\n- if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n- }\n- l2 >>= 1;\n- r2 >>= 1;\n- }\n- updateFrom(l, r);\n- }\n-\n- public int maxRight(int l, java.util.function.Predicate g) {\n- inclusiveRangeCheck(l);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (l == MAX) return MAX;\n- l += N;\n- pushTo(l);\n- S sum = E;\n- do {\n- l >>= Integer.numberOfTrailingZeros(l);\n- if (!g.test(Op.apply(sum, Dat[l]))) {\n- while (l < N) {\n- push(l);\n- l = l << 1;\n- if (g.test(Op.apply(sum, Dat[l]))) {\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- }\n- }\n- return l - N;\n- }\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- } while ((l & -l) != l);\n- return MAX;\n- }\n-\n- public int minLeft(int r, java.util.function.Predicate g) {\n- inclusiveRangeCheck(r);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (r == 0) return 0;\n- r += N;\n- pushTo(r - 1);\n- S sum = E;\n- do {\n- r--;\n- while (r > 1 && (r & 1) == 1) r >>= 1;\n- if (!g.test(Op.apply(Dat[r], sum))) {\n- while (r < N) {\n- push(r);\n- r = r << 1 | 1;\n- if (g.test(Op.apply(Dat[r], sum))) {\n- sum = Op.apply(Dat[r], sum);\n- r--;\n- }\n- }\n- return r + 1 - N;\n- }\n- sum = Op.apply(Dat[r], sum);\n- } while ((r & -r) != r);\n- return 0;\n- }\n-\n- private void exclusiveRangeCheck(int p) {\n- if (p < 0 || p >= MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n- }\n- }\n-\n- private void inclusiveRangeCheck(int p) {\n- if (p < 0 || p > MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n- }\n- }\n-}\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.BiFunction;\n+import java.util.function.BinaryOperator;\n+import java.util.function.Supplier;\n \n public class Main {\n- private static class S {\n- long zero;\n- long one;\n- long inv;\n-\n- public S(long zero, long one, long inv) {\n- this.zero = zero;\n- this.one = one;\n- this.inv = inv;\n- }\n-\n- S swap01() {\n- return new S(this.one, this.zero, this.zero * this.one - this.inv);\n- }\n-\n- static S connect(S a, S b) {\n- return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n- }\n- }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n-\n- S[] A = new S[N + 1];\n- A[0] = new S(0, 0, 0);\n- for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n-\n- LazySegTree seg =\n- new LazySegTree(\n- A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n-\n- for (int q = 0; q < Q; q++) {\n+ long[][] A = new long[N][3];\n+ for (int i = 0; i < N; i++) {\n+ int a = sc.nextInt();\n+ A[i][a] = 1;\n+ }\n+ Supplier et = () -> new long[] {0, 0, 0};\n+ Supplier es = () -> Boolean.valueOf(false);\n+ BinaryOperator op =\n+ (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n+ @SuppressWarnings(\"resource\")\n+ BiFunction mapping =\n+ (t, s) -> {\n+ if (s) {\n+ t[0] += t[1];\n+ t[1] = t[0] - t[1];\n+ t[0] = t[0] - t[1];\n+ t[2] = t[0] * t[1] - t[2];\n+ }\n+ return t;\n+ };\n+ BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n+ LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ StringBuilder sb = new StringBuilder();\n+ for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n+ int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- seg.apply(l, r + 1, true);\n- } else if (t == 2) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- System.out.println(seg.prod(l, r + 1).inv);\n+ seg.apply(l, r, Boolean.valueOf(true));\n+ } else {\n+ sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n+ System.out.println(sb.toString());\n+ sc.close();\n }\n }\n+\n+class LazySegTree {\n+\n+ private final int N;\n+ private final int SIZE;\n+ private final int LOG;\n+\n+ private final T[] DATA;\n+ private final S[] LAZY;\n+ private final Supplier ET;\n+ private final BinaryOperator OP;\n+ private final Supplier ES;\n+ private final BiFunction MAPPING;\n+ private final BinaryOperator COMPOSITION;\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < n) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = n;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ Arrays.fill(DATA, ET.get());\n+ Arrays.fill(LAZY, ES.get());\n+ }\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ T[] a,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < a.length) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = a.length;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n+ for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n+ for (int i = SIZE - 1; i > 0; i--) update(i);\n+ Arrays.fill(LAZY, ES.get());\n+ }\n+\n+ public void eval(int k) {\n+ DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n+ if (k < SIZE - 1) {\n+ LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n+ LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n+ }\n+ LAZY[k] = ES.get();\n+ }\n+\n+ public T get(int k) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ return DATA[k];\n+ }\n+\n+ public void set(int k, T v) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = v;\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n+ }\n+\n+ private void update(int k) {\n+ DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n+ }\n+\n+ public void apply(int k, S s) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = MAPPING.apply(DATA[k], s);\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n+ }\n+\n+ public void apply(int l, int r, S s) {\n+ apply(l, r, 1, 0, SIZE, s);\n+ }\n+\n+ private void apply(int l, int r, int k, int a, int b, S s) {\n+ eval(k);\n+\n+ if (r <= a || b <= l) return;\n+\n+ if (l <= a && b <= r) {\n+ LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n+ eval(k);\n+ return;\n+ }\n+\n+ apply(l, r, 2 * k, a, (a + b) / 2, s);\n+ apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n+ update(k);\n+ }\n+\n+ public T query(int l, int r) {\n+ return query(l, r, 1, 0, SIZE);\n+ }\n+\n+ public T query(int l, int r, int k, int a, int b) {\n+\n+ if (r <= a || b <= l) return ET.get();\n+ eval(k);\n+\n+ if (l <= a && b <= r) return DATA[k];\n+\n+ T vl = query(l, r, 2 * k, a, (a + b) / 2);\n+ T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n+ return OP.apply(vl, vr);\n+ }\n+}", "output": "FASTER 0.0556", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.0393, "pair_id": "java_2847_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.BiFunction;\n-import java.util.function.BinaryOperator;\n-import java.util.function.Supplier;\n+import java.util.*;\n+\n+class LazySegTree {\n+ final int MAX;\n+\n+ final int N;\n+ final int Log;\n+ final java.util.function.BinaryOperator Op;\n+ final S E;\n+ final java.util.function.BiFunction Mapping;\n+ final java.util.function.BinaryOperator Composition;\n+ final F Id;\n+\n+ final S[] Dat;\n+ final F[] Laz;\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this.MAX = n;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.Log = Integer.numberOfTrailingZeros(N);\n+ this.Op = op;\n+ this.E = e;\n+ this.Mapping = mapping;\n+ this.Composition = composition;\n+ this.Id = id;\n+ this.Dat = (S[]) new Object[N << 1];\n+ this.Laz = (F[]) new Object[N];\n+ java.util.Arrays.fill(Dat, E);\n+ java.util.Arrays.fill(Laz, Id);\n+ }\n+\n+ public LazySegTree(\n+ S[] dat,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this(dat.length, op, e, mapping, composition, id);\n+ build(dat);\n+ }\n+\n+ private void build(S[] dat) {\n+ int l = dat.length;\n+ System.arraycopy(dat, 0, Dat, N, l);\n+ for (int i = N - 1; i > 0; i--) {\n+ Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ if (Laz[k] == Id) return;\n+ int lk = k << 1 | 0, rk = k << 1 | 1;\n+ Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n+ Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n+ if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n+ if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n+ Laz[k] = Id;\n+ }\n+\n+ private void pushTo(int k) {\n+ for (int i = Log; i > 0; i--) push(k >> i);\n+ }\n+\n+ private void pushTo(int lk, int rk) {\n+ for (int i = Log; i > 0; i--) {\n+ if (((lk >> i) << i) != lk) push(lk >> i);\n+ if (((rk >> i) << i) != rk) push(rk >> i);\n+ }\n+ }\n+\n+ private void updateFrom(int k) {\n+ k >>= 1;\n+ while (k > 0) {\n+ Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n+ k >>= 1;\n+ }\n+ }\n+\n+ private void updateFrom(int lk, int rk) {\n+ for (int i = 1; i <= Log; i++) {\n+ if (((lk >> i) << i) != lk) {\n+ int lki = lk >> i;\n+ Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n+ }\n+ if (((rk >> i) << i) != rk) {\n+ int rki = (rk - 1) >> i;\n+ Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n+ }\n+ }\n+ }\n+\n+ public void set(int p, S x) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = x;\n+ updateFrom(p);\n+ }\n+\n+ public S get(int p) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ return Dat[p];\n+ }\n+\n+ public S prod(int l, int r) {\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return E;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ S sumLeft = E, sumRight = E;\n+ while (l < r) {\n+ if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n+ if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ return Op.apply(sumLeft, sumRight);\n+ }\n+\n+ public S allProd() {\n+ return Dat[1];\n+ }\n+\n+ public void apply(int p, F f) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = Mapping.apply(f, Dat[p]);\n+ updateFrom(p);\n+ }\n+\n+ public void apply(int l, int r, F f) {\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ for (int l2 = l, r2 = r; l2 < r2; ) {\n+ if ((l2 & 1) == 1) {\n+ Dat[l2] = Mapping.apply(f, Dat[l2]);\n+ if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n+ l2++;\n+ }\n+ if ((r2 & 1) == 1) {\n+ r2--;\n+ Dat[r2] = Mapping.apply(f, Dat[r2]);\n+ if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n+ }\n+ l2 >>= 1;\n+ r2 >>= 1;\n+ }\n+ updateFrom(l, r);\n+ }\n+\n+ public int maxRight(int l, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(l);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (l == MAX) return MAX;\n+ l += N;\n+ pushTo(l);\n+ S sum = E;\n+ do {\n+ l >>= Integer.numberOfTrailingZeros(l);\n+ if (!g.test(Op.apply(sum, Dat[l]))) {\n+ while (l < N) {\n+ push(l);\n+ l = l << 1;\n+ if (g.test(Op.apply(sum, Dat[l]))) {\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ }\n+ }\n+ return l - N;\n+ }\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ } while ((l & -l) != l);\n+ return MAX;\n+ }\n+\n+ public int minLeft(int r, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(r);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (r == 0) return 0;\n+ r += N;\n+ pushTo(r - 1);\n+ S sum = E;\n+ do {\n+ r--;\n+ while (r > 1 && (r & 1) == 1) r >>= 1;\n+ if (!g.test(Op.apply(Dat[r], sum))) {\n+ while (r < N) {\n+ push(r);\n+ r = r << 1 | 1;\n+ if (g.test(Op.apply(Dat[r], sum))) {\n+ sum = Op.apply(Dat[r], sum);\n+ r--;\n+ }\n+ }\n+ return r + 1 - N;\n+ }\n+ sum = Op.apply(Dat[r], sum);\n+ } while ((r & -r) != r);\n+ return 0;\n+ }\n+\n+ private void exclusiveRangeCheck(int p) {\n+ if (p < 0 || p >= MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n+ }\n+ }\n+\n+ private void inclusiveRangeCheck(int p) {\n+ if (p < 0 || p > MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n+ }\n+ }\n+}\n \n public class Main {\n+ private static class S {\n+ long zero;\n+ long one;\n+ long inv;\n+\n+ public S(long zero, long one, long inv) {\n+ this.zero = zero;\n+ this.one = one;\n+ this.inv = inv;\n+ }\n+\n+ S swap01() {\n+ return new S(this.one, this.zero, this.zero * this.one - this.inv);\n+ }\n+\n+ static S connect(S a, S b) {\n+ return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n+ }\n+ }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n- long[][] A = new long[N][3];\n- for (int i = 0; i < N; i++) {\n- int a = sc.nextInt();\n- A[i][a] = 1;\n- }\n- Supplier et = () -> new long[] {0, 0, 0};\n- Supplier es = () -> Boolean.valueOf(false);\n- BinaryOperator op =\n- (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n- @SuppressWarnings(\"resource\")\n- BiFunction mapping =\n- (t, s) -> {\n- if (s) {\n- t[0] += t[1];\n- t[1] = t[0] - t[1];\n- t[0] = t[0] - t[1];\n- t[2] = t[0] * t[1] - t[2];\n- }\n- return t;\n- };\n- BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n- LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n- StringBuilder sb = new StringBuilder();\n- for (int i = 0; i < Q; i++) {\n+\n+ S[] A = new S[N + 1];\n+ A[0] = new S(0, 0, 0);\n+ for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n+\n+ LazySegTree seg =\n+ new LazySegTree(\n+ A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n+\n+ for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n- int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n- seg.apply(l, r, Boolean.valueOf(true));\n- } else {\n- sb.append(seg.query(l, r)[2] + \"\\n\");\n- }\n- }\n- System.out.println(sb.toString());\n- sc.close();\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ seg.apply(l, r + 1, true);\n+ } else if (t == 2) {\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ System.out.println(seg.prod(l, r + 1).inv);\n+ }\n+ }\n }\n }\n-\n-class LazySegTree {\n-\n- private final int N;\n- private final int SIZE;\n- private final int LOG;\n-\n- private final T[] DATA;\n- private final S[] LAZY;\n- private final Supplier ET;\n- private final BinaryOperator OP;\n- private final Supplier ES;\n- private final BiFunction MAPPING;\n- private final BinaryOperator COMPOSITION;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < n) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = n;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- Arrays.fill(DATA, ET.get());\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- T[] a,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < a.length) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = a.length;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n- for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n- for (int i = SIZE - 1; i > 0; i--) update(i);\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- public void eval(int k) {\n- DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n- if (k < SIZE - 1) {\n- LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n- LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n- }\n- LAZY[k] = ES.get();\n- }\n-\n- public T get(int k) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- return DATA[k];\n- }\n-\n- public void set(int k, T v) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = v;\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- private void update(int k) {\n- DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n- }\n-\n- public void apply(int k, S s) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = MAPPING.apply(DATA[k], s);\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- public void apply(int l, int r, S s) {\n- apply(l, r, 1, 0, SIZE, s);\n- }\n-\n- private void apply(int l, int r, int k, int a, int b, S s) {\n- eval(k);\n-\n- if (r <= a || b <= l) return;\n-\n- if (l <= a && b <= r) {\n- LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n- eval(k);\n- return;\n- }\n-\n- apply(l, r, 2 * k, a, (a + b) / 2, s);\n- apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n- update(k);\n- }\n-\n- public T query(int l, int r) {\n- return query(l, r, 1, 0, SIZE);\n- }\n-\n- public T query(int l, int r, int k, int a, int b) {\n-\n- if (r <= a || b <= l) return ET.get();\n- eval(k);\n-\n- if (l <= a && b <= r) return DATA[k];\n-\n- T vl = query(l, r, 2 * k, a, (a + b) / 2);\n- T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n- return OP.apply(vl, vr);\n- }\n-}", "output": "SLOWER 0.0556", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.0393, "pair_id": "java_2847_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.BiFunction;\n-import java.util.function.BinaryOperator;\n-import java.util.function.Supplier;\n+import java.io.*;\n+import java.util.*;\n+\n+class Count {\n+ final long count0, count1, count01, count10;\n+\n+ Count(long count0, long count1, long count01, long count10) {\n+ this.count0 = count0;\n+ this.count1 = count1;\n+ this.count01 = count01;\n+ this.count10 = count10;\n+ }\n+\n+ Count flip() {\n+ return new Count(count1, count0, count10, count01);\n+ }\n+}\n \n public class Main {\n+ private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n+\n+ private static LazySegmentTree.Operator OPERATOR =\n+ new LazySegmentTree.Operator<>() {\n+ @Override\n+ public Count e() {\n+ return COUNT_EMPTY;\n+ }\n+\n+ @Override\n+ public Boolean id() {\n+ return Boolean.valueOf(true);\n+ }\n+\n+ @Override\n+ public Count mapping(Boolean lazyValue, Count value, int count) {\n+ if (lazyValue) {\n+ return value;\n+ }\n+ return value.flip();\n+ }\n+\n+ @Override\n+ public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n+ return newLazy == oldLazy;\n+ }\n+\n+ @Override\n+ public Count op(Count smallIndexValue, Count largeIndexValue) {\n+ long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n+ long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n+ long count01 =\n+ smallIndexValue.count01\n+ + largeIndexValue.count01\n+ + smallIndexValue.count0 * largeIndexValue.count1;\n+ long count10 =\n+ smallIndexValue.count10\n+ + largeIndexValue.count10\n+ + smallIndexValue.count1 * largeIndexValue.count0;\n+ return new Count(count0, count1, count01, count10);\n+ }\n+ };\n+\n+ private static List solve(int n, int q, int[] as, int[][] tlrs) {\n+ Count[] counts = new Count[n];\n+ for (int i = 0; i < n; i++) {\n+ counts[i] = new Count(1 - as[i], as[i], 0, 0);\n+ }\n+ LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n+ List answers = new ArrayList<>();\n+ for (int[] tlr : tlrs) {\n+ int t = tlr[0];\n+ int l = tlr[1] - 1;\n+ int r = tlr[2];\n+ if (t == 1) {\n+ segmentTree.apply(l, r, Boolean.valueOf(false));\n+ } else {\n+ answers.add(segmentTree.prod(l, r).count10);\n+ }\n+ }\n+ return answers;\n+ }\n+\n+ private static void execute(ContestReader reader, ContestWriter out) {\n+ int n = reader.nextInt();\n+ int q = reader.nextInt();\n+ int[] as = reader.nextInt(n);\n+ int[][] tlrs = reader.nextInt(q, 3);\n+ out.printList(solve(n, q, as, tlrs));\n+ }\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- int Q = sc.nextInt();\n- long[][] A = new long[N][3];\n- for (int i = 0; i < N; i++) {\n- int a = sc.nextInt();\n- A[i][a] = 1;\n- }\n- Supplier et = () -> new long[] {0, 0, 0};\n- Supplier es = () -> Boolean.valueOf(false);\n- BinaryOperator op =\n- (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n- @SuppressWarnings(\"resource\")\n- BiFunction mapping =\n- (t, s) -> {\n- if (s) {\n- t[0] += t[1];\n- t[1] = t[0] - t[1];\n- t[0] = t[0] - t[1];\n- t[2] = t[0] * t[1] - t[2];\n- }\n- return t;\n- };\n- BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n- LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ ContestReader reader = new ContestReader(System.in);\n+ ContestWriter out = new ContestWriter(System.out);\n+ execute(reader, out);\n+ out.flush();\n+ }\n+}\n+\n+class ContestWriter extends PrintWriter {\n+ ContestWriter(PrintStream printStream) {\n+ super(printStream);\n+ }\n+\n+ public void printList(List list) {\n+ for (Object object : list) {\n+ println(object);\n+ }\n+ }\n+\n+ public void printListOneLine(List list) {\n+ List stringList = new ArrayList<>();\n+ for (Object object : list) {\n+ stringList.add(object.toString());\n+ }\n+ println(String.join(\" \", stringList));\n+ }\n+}\n+\n+class LazySegmentTree {\n+ public interface Operator {\n+ S e();\n+\n+ F id();\n+\n+ S mapping(F lazyValue, S value, int count);\n+\n+ F composition(F newLazy, F oldLazy);\n+\n+ S op(S smallIndexValue, S largeIndexValue);\n+ }\n+\n+ private final Operator operator;\n+ private final int n, log, size;\n+ private final S[] d;\n+ private final F[] lz;\n+\n+ private static int ceil_pow2(int n) {\n+ int x = 0;\n+ while ((1 << x) < n) {\n+ x++;\n+ }\n+ return x;\n+ }\n+\n+ public LazySegmentTree(Operator operator, S[] v) {\n+ this.operator = operator;\n+ this.n = v.length;\n+ this.log = ceil_pow2(n);\n+ this.size = 1 << log;\n+ this.d = (S[]) new Object[2 * size];\n+ Arrays.fill(this.d, this.operator.e());\n+ this.lz = (F[]) new Object[size];\n+ Arrays.fill(this.lz, this.operator.id());\n+ for (int i = 0; i < n; i++) {\n+ this.d[size + i] = v[i];\n+ }\n+ for (int i = size - 1; i >= 1; i--) {\n+ update(i);\n+ }\n+ }\n+\n+ public void set(int p, S x) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = x;\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n+ }\n+\n+ public S get(int p) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ return d[p];\n+ }\n+\n+ public S prod(int l, int r) {\n+\n+ if (l == r) {\n+ operator.e();\n+ }\n+ l += size;\n+ r += size;\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push(r >> i);\n+ }\n+ }\n+ S lValue = operator.e();\n+ S rValue = operator.e();\n+ while (l < r) {\n+ if ((l & 1) == 1) {\n+ lValue = operator.op(lValue, d[l]);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ rValue = operator.op(d[r], rValue);\n+ }\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ return operator.op(lValue, rValue);\n+ }\n+\n+ public S allProd() {\n+ return d[1];\n+ }\n+\n+ public void apply(int p, F f) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = operator.mapping(f, d[p], 1);\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n+ }\n+\n+ public void apply(int l, int r, F f) {\n+\n+ if (l == r) {\n+ return;\n+ }\n+\n+ l += size;\n+ r += size;\n+\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push((r - 1) >> i);\n+ }\n+ }\n+\n+ {\n+ int l2 = l;\n+ int r2 = r;\n+ while (l < r) {\n+ if ((l & 1) == 1) {\n+ allApply(l, f);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ allApply(r, f);\n+ }\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ l = l2;\n+ r = r2;\n+ }\n+\n+ for (int i = 1; i <= log; i++) {\n+ if (((l >> i) << i) != l) {\n+ update(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ update((r - 1) >> i);\n+ }\n+ }\n+ }\n+\n+ private void update(int k) {\n+ d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n+ }\n+\n+ private void allApply(int k, F f) {\n+ int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n+\n+ d[k] = this.operator.mapping(f, d[k], count);\n+ if (k < size) {\n+ lz[k] = this.operator.composition(f, lz[k]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ allApply(2 * k, lz[k]);\n+ allApply(2 * k + 1, lz[k]);\n+ lz[k] = this.operator.id();\n+ }\n+}\n+\n+class ContestReader {\n+ private static final int BUFFER_SIZE = 1024;\n+\n+ private final InputStream stream;\n+ private final byte[] buffer;\n+ private int pointer;\n+ private int bufferLength;\n+\n+ ContestReader(InputStream stream) {\n+ this.stream = stream;\n+ this.buffer = new byte[BUFFER_SIZE];\n+ this.pointer = 0;\n+ this.bufferLength = 0;\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (pointer < bufferLength) {\n+ return true;\n+ }\n+\n+ pointer = 0;\n+ try {\n+ bufferLength = stream.read(buffer);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ return bufferLength > 0;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) {\n+ return buffer[pointer++];\n+ } else {\n+ return -1;\n+ }\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n+ pointer++;\n+ }\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n StringBuilder sb = new StringBuilder();\n- for (int i = 0; i < Q; i++) {\n- int t = sc.nextInt();\n- int l = sc.nextInt() - 1, r = sc.nextInt();\n- if (t == 1) {\n- seg.apply(l, r, Boolean.valueOf(true));\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b)) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public String nextLine() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b) && b != 0x20) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public char nextChar() {\n+ return next().charAt(0);\n+ }\n+\n+ public int nextInt() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ int n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n } else {\n- sb.append(seg.query(l, r)[2] + \"\\n\");\n- }\n- }\n- System.out.println(sb.toString());\n- sc.close();\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ long n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String[] next(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = next();\n+ }\n+ return array;\n+ }\n+\n+ public String[] nextLine(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLine();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextChar(int n) {\n+ char[] array = new char[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextChar();\n+ }\n+ return array;\n+ }\n+\n+ public int[] nextInt(int n) {\n+ int[] array = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextInt();\n+ }\n+ return array;\n+ }\n+\n+ public long[] nextLong(int n) {\n+ long[] array = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLong();\n+ }\n+ return array;\n+ }\n+\n+ public double[] nextDouble(int n) {\n+ double[] array = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextDouble();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextCharArray() {\n+ return next().toCharArray();\n+ }\n+\n+ public String[][] next(int n, int m) {\n+ String[][] matrix = new String[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = next();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public int[][] nextInt(int n, int m) {\n+ int[][] matrix = new int[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextInt();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextChar(int n, int m) {\n+ char[][] matrix = new char[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextChar();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public long[][] nextLong(int n, int m) {\n+ long[][] matrix = new long[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextLong();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public double[][] nextDouble(int n, int m) {\n+ double[][] matrix = new double[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextDouble();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextCharArray(int n) {\n+ char[][] matrix = new char[n][];\n+ for (int i = 0; i < n; i++) {\n+ matrix[i] = next().toCharArray();\n+ }\n+ return matrix;\n }\n }\n \n-class LazySegTree {\n-\n- private final int N;\n- private final int SIZE;\n- private final int LOG;\n-\n- private final T[] DATA;\n- private final S[] LAZY;\n- private final Supplier ET;\n- private final BinaryOperator OP;\n- private final Supplier ES;\n- private final BiFunction MAPPING;\n- private final BinaryOperator COMPOSITION;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < n) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = n;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- Arrays.fill(DATA, ET.get());\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- T[] a,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < a.length) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = a.length;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n- for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n- for (int i = SIZE - 1; i > 0; i--) update(i);\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- public void eval(int k) {\n- DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n- if (k < SIZE - 1) {\n- LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n- LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n- }\n- LAZY[k] = ES.get();\n- }\n-\n- public T get(int k) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- return DATA[k];\n- }\n-\n- public void set(int k, T v) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = v;\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- private void update(int k) {\n- DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n- }\n-\n- public void apply(int k, S s) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = MAPPING.apply(DATA[k], s);\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- public void apply(int l, int r, S s) {\n- apply(l, r, 1, 0, SIZE, s);\n- }\n-\n- private void apply(int l, int r, int k, int a, int b, S s) {\n- eval(k);\n-\n- if (r <= a || b <= l) return;\n-\n- if (l <= a && b <= r) {\n- LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n- eval(k);\n- return;\n- }\n-\n- apply(l, r, 2 * k, a, (a + b) / 2, s);\n- apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n- update(k);\n- }\n-\n- public T query(int l, int r) {\n- return query(l, r, 1, 0, SIZE);\n- }\n-\n- public T query(int l, int r, int k, int a, int b) {\n-\n- if (r <= a || b <= l) return ET.get();\n- eval(k);\n-\n- if (l <= a && b <= r) return DATA[k];\n-\n- T vl = query(l, r, 2 * k, a, (a + b) / 2);\n- T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n- return OP.apply(vl, vr);\n+class MyAssert {\n+ public static void myAssert(boolean flag, String message) {\n+ if (!flag) {\n+ throw new RuntimeException(message);\n+ }\n+ }\n+\n+ public static void myAssert(boolean flag) {\n+ myAssert(flag, \"\");\n }\n }", "output": "FASTER 0.8076", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.7503, "pair_id": "java_2843_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.BiFunction;\n+import java.util.function.BinaryOperator;\n+import java.util.function.Supplier;\n \n-class Count {\n- final long count0, count1, count01, count10;\n+public class Main {\n \n- Count(long count0, long count1, long count01, long count10) {\n- this.count0 = count0;\n- this.count1 = count1;\n- this.count01 = count01;\n- this.count10 = count10;\n- }\n-\n- Count flip() {\n- return new Count(count1, count0, count10, count01);\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ int Q = sc.nextInt();\n+ long[][] A = new long[N][3];\n+ for (int i = 0; i < N; i++) {\n+ int a = sc.nextInt();\n+ A[i][a] = 1;\n+ }\n+ Supplier et = () -> new long[] {0, 0, 0};\n+ Supplier es = () -> Boolean.valueOf(false);\n+ BinaryOperator op =\n+ (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n+ @SuppressWarnings(\"resource\")\n+ BiFunction mapping =\n+ (t, s) -> {\n+ if (s) {\n+ t[0] += t[1];\n+ t[1] = t[0] - t[1];\n+ t[0] = t[0] - t[1];\n+ t[2] = t[0] * t[1] - t[2];\n+ }\n+ return t;\n+ };\n+ BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n+ LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ StringBuilder sb = new StringBuilder();\n+ for (int i = 0; i < Q; i++) {\n+ int t = sc.nextInt();\n+ int l = sc.nextInt() - 1, r = sc.nextInt();\n+ if (t == 1) {\n+ seg.apply(l, r, Boolean.valueOf(true));\n+ } else {\n+ sb.append(seg.query(l, r)[2] + \"\\n\");\n+ }\n+ }\n+ System.out.println(sb.toString());\n+ sc.close();\n }\n }\n \n-public class Main {\n- private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n+class LazySegTree {\n \n- private static LazySegmentTree.Operator OPERATOR =\n- new LazySegmentTree.Operator<>() {\n- @Override\n- public Count e() {\n- return COUNT_EMPTY;\n- }\n+ private final int N;\n+ private final int SIZE;\n+ private final int LOG;\n \n- @Override\n- public Boolean id() {\n- return Boolean.valueOf(true);\n- }\n+ private final T[] DATA;\n+ private final S[] LAZY;\n+ private final Supplier ET;\n+ private final BinaryOperator OP;\n+ private final Supplier ES;\n+ private final BiFunction MAPPING;\n+ private final BinaryOperator COMPOSITION;\n \n- @Override\n- public Count mapping(Boolean lazyValue, Count value, int count) {\n- if (lazyValue) {\n- return value;\n- }\n- return value.flip();\n- }\n-\n- @Override\n- public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n- return newLazy == oldLazy;\n- }\n-\n- @Override\n- public Count op(Count smallIndexValue, Count largeIndexValue) {\n- long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n- long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n- long count01 =\n- smallIndexValue.count01\n- + largeIndexValue.count01\n- + smallIndexValue.count0 * largeIndexValue.count1;\n- long count10 =\n- smallIndexValue.count10\n- + largeIndexValue.count10\n- + smallIndexValue.count1 * largeIndexValue.count0;\n- return new Count(count0, count1, count01, count10);\n- }\n- };\n-\n- private static List solve(int n, int q, int[] as, int[][] tlrs) {\n- Count[] counts = new Count[n];\n- for (int i = 0; i < n; i++) {\n- counts[i] = new Count(1 - as[i], as[i], 0, 0);\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < n) {\n+ tmpLog++;\n+ tmpSize *= 2;\n }\n- LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n- List answers = new ArrayList<>();\n- for (int[] tlr : tlrs) {\n- int t = tlr[0];\n- int l = tlr[1] - 1;\n- int r = tlr[2];\n- if (t == 1) {\n- segmentTree.apply(l, r, Boolean.valueOf(false));\n- } else {\n- answers.add(segmentTree.prod(l, r).count10);\n- }\n- }\n- return answers;\n+ this.N = n;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ Arrays.fill(DATA, ET.get());\n+ Arrays.fill(LAZY, ES.get());\n }\n \n- private static void execute(ContestReader reader, ContestWriter out) {\n- int n = reader.nextInt();\n- int q = reader.nextInt();\n- int[] as = reader.nextInt(n);\n- int[][] tlrs = reader.nextInt(q, 3);\n- out.printList(solve(n, q, as, tlrs));\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ T[] a,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < a.length) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = a.length;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n+ for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n+ for (int i = SIZE - 1; i > 0; i--) update(i);\n+ Arrays.fill(LAZY, ES.get());\n }\n \n- public static void main(String[] args) {\n- ContestReader reader = new ContestReader(System.in);\n- ContestWriter out = new ContestWriter(System.out);\n- execute(reader, out);\n- out.flush();\n- }\n-}\n-\n-class ContestWriter extends PrintWriter {\n- ContestWriter(PrintStream printStream) {\n- super(printStream);\n+ public void eval(int k) {\n+ DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n+ if (k < SIZE - 1) {\n+ LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n+ LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n+ }\n+ LAZY[k] = ES.get();\n }\n \n- public void printList(List list) {\n- for (Object object : list) {\n- println(object);\n- }\n+ public T get(int k) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ return DATA[k];\n }\n \n- public void printListOneLine(List list) {\n- List stringList = new ArrayList<>();\n- for (Object object : list) {\n- stringList.add(object.toString());\n- }\n- println(String.join(\" \", stringList));\n- }\n-}\n-\n-class LazySegmentTree {\n- public interface Operator {\n- S e();\n-\n- F id();\n-\n- S mapping(F lazyValue, S value, int count);\n-\n- F composition(F newLazy, F oldLazy);\n-\n- S op(S smallIndexValue, S largeIndexValue);\n+ public void set(int k, T v) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = v;\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n- private final Operator operator;\n- private final int n, log, size;\n- private final S[] d;\n- private final F[] lz;\n-\n- private static int ceil_pow2(int n) {\n- int x = 0;\n- while ((1 << x) < n) {\n- x++;\n- }\n- return x;\n+ private void update(int k) {\n+ DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n \n- public LazySegmentTree(Operator operator, S[] v) {\n- this.operator = operator;\n- this.n = v.length;\n- this.log = ceil_pow2(n);\n- this.size = 1 << log;\n- this.d = (S[]) new Object[2 * size];\n- Arrays.fill(this.d, this.operator.e());\n- this.lz = (F[]) new Object[size];\n- Arrays.fill(this.lz, this.operator.id());\n- for (int i = 0; i < n; i++) {\n- this.d[size + i] = v[i];\n- }\n- for (int i = size - 1; i >= 1; i--) {\n- update(i);\n- }\n+ public void apply(int k, S s) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = MAPPING.apply(DATA[k], s);\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n- public void set(int p, S x) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = x;\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n+ public void apply(int l, int r, S s) {\n+ apply(l, r, 1, 0, SIZE, s);\n }\n \n- public S get(int p) {\n+ private void apply(int l, int r, int k, int a, int b, S s) {\n+ eval(k);\n \n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- return d[p];\n- }\n+ if (r <= a || b <= l) return;\n \n- public S prod(int l, int r) {\n-\n- if (l == r) {\n- operator.e();\n- }\n- l += size;\n- r += size;\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push(r >> i);\n- }\n- }\n- S lValue = operator.e();\n- S rValue = operator.e();\n- while (l < r) {\n- if ((l & 1) == 1) {\n- lValue = operator.op(lValue, d[l]);\n- l++;\n- }\n- if ((r & 1) == 1) {\n- r--;\n- rValue = operator.op(d[r], rValue);\n- }\n- l >>= 1;\n- r >>= 1;\n- }\n- return operator.op(lValue, rValue);\n- }\n-\n- public S allProd() {\n- return d[1];\n- }\n-\n- public void apply(int p, F f) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = operator.mapping(f, d[p], 1);\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n- }\n-\n- public void apply(int l, int r, F f) {\n-\n- if (l == r) {\n+ if (l <= a && b <= r) {\n+ LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n+ eval(k);\n return;\n }\n \n- l += size;\n- r += size;\n-\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push((r - 1) >> i);\n- }\n- }\n-\n- {\n- int l2 = l;\n- int r2 = r;\n- while (l < r) {\n- if ((l & 1) == 1) {\n- allApply(l, f);\n- l++;\n- }\n- if ((r & 1) == 1) {\n- r--;\n- allApply(r, f);\n- }\n- l >>= 1;\n- r >>= 1;\n- }\n- l = l2;\n- r = r2;\n- }\n-\n- for (int i = 1; i <= log; i++) {\n- if (((l >> i) << i) != l) {\n- update(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- update((r - 1) >> i);\n- }\n- }\n+ apply(l, r, 2 * k, a, (a + b) / 2, s);\n+ apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n+ update(k);\n }\n \n- private void update(int k) {\n- d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n+ public T query(int l, int r) {\n+ return query(l, r, 1, 0, SIZE);\n }\n \n- private void allApply(int k, F f) {\n- int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n+ public T query(int l, int r, int k, int a, int b) {\n \n- d[k] = this.operator.mapping(f, d[k], count);\n- if (k < size) {\n- lz[k] = this.operator.composition(f, lz[k]);\n- }\n- }\n+ if (r <= a || b <= l) return ET.get();\n+ eval(k);\n \n- private void push(int k) {\n- allApply(2 * k, lz[k]);\n- allApply(2 * k + 1, lz[k]);\n- lz[k] = this.operator.id();\n+ if (l <= a && b <= r) return DATA[k];\n+\n+ T vl = query(l, r, 2 * k, a, (a + b) / 2);\n+ T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n+ return OP.apply(vl, vr);\n }\n }\n-\n-class ContestReader {\n- private static final int BUFFER_SIZE = 1024;\n-\n- private final InputStream stream;\n- private final byte[] buffer;\n- private int pointer;\n- private int bufferLength;\n-\n- ContestReader(InputStream stream) {\n- this.stream = stream;\n- this.buffer = new byte[BUFFER_SIZE];\n- this.pointer = 0;\n- this.bufferLength = 0;\n- }\n-\n- private boolean hasNextByte() {\n- if (pointer < bufferLength) {\n- return true;\n- }\n-\n- pointer = 0;\n- try {\n- bufferLength = stream.read(buffer);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- return bufferLength > 0;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) {\n- return buffer[pointer++];\n- } else {\n- return -1;\n- }\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n- pointer++;\n- }\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b)) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public String nextLine() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b) && b != 0x20) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public char nextChar() {\n- return next().charAt(0);\n- }\n-\n- public int nextInt() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- int n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- long n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String[] next(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = next();\n- }\n- return array;\n- }\n-\n- public String[] nextLine(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLine();\n- }\n- return array;\n- }\n-\n- public char[] nextChar(int n) {\n- char[] array = new char[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextChar();\n- }\n- return array;\n- }\n-\n- public int[] nextInt(int n) {\n- int[] array = new int[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextInt();\n- }\n- return array;\n- }\n-\n- public long[] nextLong(int n) {\n- long[] array = new long[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLong();\n- }\n- return array;\n- }\n-\n- public double[] nextDouble(int n) {\n- double[] array = new double[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextDouble();\n- }\n- return array;\n- }\n-\n- public char[] nextCharArray() {\n- return next().toCharArray();\n- }\n-\n- public String[][] next(int n, int m) {\n- String[][] matrix = new String[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = next();\n- }\n- }\n- return matrix;\n- }\n-\n- public int[][] nextInt(int n, int m) {\n- int[][] matrix = new int[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextInt();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextChar(int n, int m) {\n- char[][] matrix = new char[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextChar();\n- }\n- }\n- return matrix;\n- }\n-\n- public long[][] nextLong(int n, int m) {\n- long[][] matrix = new long[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextLong();\n- }\n- }\n- return matrix;\n- }\n-\n- public double[][] nextDouble(int n, int m) {\n- double[][] matrix = new double[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextDouble();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextCharArray(int n) {\n- char[][] matrix = new char[n][];\n- for (int i = 0; i < n; i++) {\n- matrix[i] = next().toCharArray();\n- }\n- return matrix;\n- }\n-}\n-\n-class MyAssert {\n- public static void myAssert(boolean flag, String message) {\n- if (!flag) {\n- throw new RuntimeException(message);\n- }\n- }\n-\n- public static void myAssert(boolean flag) {\n- myAssert(flag, \"\");\n- }\n-}", "output": "SLOWER 0.8076", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.7503, "pair_id": "java_2843_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Arrays;\n import java.util.Scanner;\n import java.util.function.BiFunction;\n import java.util.function.BinaryOperator;\n import java.util.function.Supplier;\n \n public class Main {\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n- if (!s) return t;\n- return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n+ if (s) {\n+ t[0] += t[1];\n+ t[1] = t[0] - t[1];\n+ t[0] = t[0] - t[1];\n+ t[2] = t[0] * t[1] - t[2];\n+ }\n+ return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n }\n \n class LazySegTree {\n \n private final int N;\n private final int SIZE;\n private final int LOG;\n \n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n \n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n \n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n \n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n \n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n \n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n \n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n \n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n \n if (r <= a || b <= l) return;\n \n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n \n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n \n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n \n public T query(int l, int r, int k, int a, int b) {\n \n if (r <= a || b <= l) return ET.get();\n eval(k);\n \n if (l <= a && b <= r) return DATA[k];\n \n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n }", "output": "FASTER 0.0322", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.0226, "pair_id": "java_2846_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (s) {\n t[0] += t[1];\n t[1] = t[0] - t[1];\n t[0] = t[0] - t[1];\n t[2] = t[0] * t[1] - t[2];\n }\n return t;\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Arrays;\n import java.util.Scanner;\n import java.util.function.BiFunction;\n import java.util.function.BinaryOperator;\n import java.util.function.Supplier;\n \n public class Main {\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n- if (s) {\n- t[0] += t[1];\n- t[1] = t[0] - t[1];\n- t[0] = t[0] - t[1];\n- t[2] = t[0] * t[1] - t[2];\n- }\n- return t;\n+ if (!s) return t;\n+ return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n }\n \n class LazySegTree {\n \n private final int N;\n private final int SIZE;\n private final int LOG;\n \n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n \n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n \n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n \n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n \n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n \n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n \n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n \n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n \n if (r <= a || b <= l) return;\n \n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n \n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n \n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n \n public T query(int l, int r, int k, int a, int b) {\n \n if (r <= a || b <= l) return ET.get();\n eval(k);\n \n if (l <= a && b <= r) return DATA[k];\n \n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n }", "output": "SLOWER 0.0322", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.0226, "pair_id": "java_2846_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n-\n-class LazySegTree {\n- final int MAX;\n-\n- final int N;\n- final int Log;\n- final java.util.function.BinaryOperator Op;\n- final S E;\n- final java.util.function.BiFunction Mapping;\n- final java.util.function.BinaryOperator Composition;\n- final F Id;\n-\n- final S[] Dat;\n- final F[] Laz;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this.MAX = n;\n- int k = 1;\n- while (k < n) k <<= 1;\n- this.N = k;\n- this.Log = Integer.numberOfTrailingZeros(N);\n- this.Op = op;\n- this.E = e;\n- this.Mapping = mapping;\n- this.Composition = composition;\n- this.Id = id;\n- this.Dat = (S[]) new Object[N << 1];\n- this.Laz = (F[]) new Object[N];\n- java.util.Arrays.fill(Dat, E);\n- java.util.Arrays.fill(Laz, Id);\n- }\n-\n- public LazySegTree(\n- S[] dat,\n- java.util.function.BinaryOperator op,\n- S e,\n- java.util.function.BiFunction mapping,\n- java.util.function.BinaryOperator composition,\n- F id) {\n- this(dat.length, op, e, mapping, composition, id);\n- build(dat);\n- }\n-\n- private void build(S[] dat) {\n- int l = dat.length;\n- System.arraycopy(dat, 0, Dat, N, l);\n- for (int i = N - 1; i > 0; i--) {\n- Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n- }\n- }\n-\n- private void push(int k) {\n- if (Laz[k] == Id) return;\n- int lk = k << 1 | 0, rk = k << 1 | 1;\n- Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n- Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n- if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n- if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n- Laz[k] = Id;\n- }\n-\n- private void pushTo(int k) {\n- for (int i = Log; i > 0; i--) push(k >> i);\n- }\n-\n- private void pushTo(int lk, int rk) {\n- for (int i = Log; i > 0; i--) {\n- if (((lk >> i) << i) != lk) push(lk >> i);\n- if (((rk >> i) << i) != rk) push(rk >> i);\n- }\n- }\n-\n- private void updateFrom(int k) {\n- k >>= 1;\n- while (k > 0) {\n- Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n- k >>= 1;\n- }\n- }\n-\n- private void updateFrom(int lk, int rk) {\n- for (int i = 1; i <= Log; i++) {\n- if (((lk >> i) << i) != lk) {\n- int lki = lk >> i;\n- Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n- }\n- if (((rk >> i) << i) != rk) {\n- int rki = (rk - 1) >> i;\n- Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n- }\n- }\n- }\n-\n- public void set(int p, S x) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = x;\n- updateFrom(p);\n- }\n-\n- public S get(int p) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- return Dat[p];\n- }\n-\n- public S prod(int l, int r) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return E;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- S sumLeft = E, sumRight = E;\n- while (l < r) {\n- if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n- if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n- l >>= 1;\n- r >>= 1;\n- }\n- return Op.apply(sumLeft, sumRight);\n- }\n-\n- public S allProd() {\n- return Dat[1];\n- }\n-\n- public void apply(int p, F f) {\n- exclusiveRangeCheck(p);\n- p += N;\n- pushTo(p);\n- Dat[p] = Mapping.apply(f, Dat[p]);\n- updateFrom(p);\n- }\n-\n- public void apply(int l, int r, F f) {\n- if (l > r) {\n- throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n- }\n- inclusiveRangeCheck(l);\n- inclusiveRangeCheck(r);\n- if (l == r) return;\n- l += N;\n- r += N;\n- pushTo(l, r);\n- for (int l2 = l, r2 = r; l2 < r2; ) {\n- if ((l2 & 1) == 1) {\n- Dat[l2] = Mapping.apply(f, Dat[l2]);\n- if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n- l2++;\n- }\n- if ((r2 & 1) == 1) {\n- r2--;\n- Dat[r2] = Mapping.apply(f, Dat[r2]);\n- if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n- }\n- l2 >>= 1;\n- r2 >>= 1;\n- }\n- updateFrom(l, r);\n- }\n-\n- public int maxRight(int l, java.util.function.Predicate g) {\n- inclusiveRangeCheck(l);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (l == MAX) return MAX;\n- l += N;\n- pushTo(l);\n- S sum = E;\n- do {\n- l >>= Integer.numberOfTrailingZeros(l);\n- if (!g.test(Op.apply(sum, Dat[l]))) {\n- while (l < N) {\n- push(l);\n- l = l << 1;\n- if (g.test(Op.apply(sum, Dat[l]))) {\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- }\n- }\n- return l - N;\n- }\n- sum = Op.apply(sum, Dat[l]);\n- l++;\n- } while ((l & -l) != l);\n- return MAX;\n- }\n-\n- public int minLeft(int r, java.util.function.Predicate g) {\n- inclusiveRangeCheck(r);\n- if (!g.test(E)) {\n- throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n- }\n- if (r == 0) return 0;\n- r += N;\n- pushTo(r - 1);\n- S sum = E;\n- do {\n- r--;\n- while (r > 1 && (r & 1) == 1) r >>= 1;\n- if (!g.test(Op.apply(Dat[r], sum))) {\n- while (r < N) {\n- push(r);\n- r = r << 1 | 1;\n- if (g.test(Op.apply(Dat[r], sum))) {\n- sum = Op.apply(Dat[r], sum);\n- r--;\n- }\n- }\n- return r + 1 - N;\n- }\n- sum = Op.apply(Dat[r], sum);\n- } while ((r & -r) != r);\n- return 0;\n- }\n-\n- private void exclusiveRangeCheck(int p) {\n- if (p < 0 || p >= MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n- }\n- }\n-\n- private void inclusiveRangeCheck(int p) {\n- if (p < 0 || p > MAX) {\n- throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n- }\n- }\n-}\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.BiFunction;\n+import java.util.function.BinaryOperator;\n+import java.util.function.Supplier;\n \n public class Main {\n- private static class S {\n- long zero;\n- long one;\n- long inv;\n-\n- public S(long zero, long one, long inv) {\n- this.zero = zero;\n- this.one = one;\n- this.inv = inv;\n- }\n-\n- S swap01() {\n- return new S(this.one, this.zero, this.zero * this.one - this.inv);\n- }\n-\n- static S connect(S a, S b) {\n- return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n- }\n- }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n-\n- S[] A = new S[N + 1];\n- A[0] = new S(0, 0, 0);\n- for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n-\n- LazySegTree seg =\n- new LazySegTree(\n- A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n-\n- for (int q = 0; q < Q; q++) {\n+ long[][] A = new long[N][3];\n+ for (int i = 0; i < N; i++) {\n+ int a = sc.nextInt();\n+ A[i][a] = 1;\n+ }\n+ Supplier et = () -> new long[] {0, 0, 0};\n+ Supplier es = () -> Boolean.valueOf(false);\n+ BinaryOperator op =\n+ (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n+ @SuppressWarnings(\"resource\")\n+ BiFunction mapping =\n+ (t, s) -> {\n+ if (!s) return t;\n+ return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n+ };\n+ BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n+ LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ StringBuilder sb = new StringBuilder();\n+ for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n+ int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- seg.apply(l, r + 1, true);\n- } else if (t == 2) {\n- int l = sc.nextInt();\n- int r = sc.nextInt();\n- System.out.println(seg.prod(l, r + 1).inv);\n+ seg.apply(l, r, Boolean.valueOf(true));\n+ } else {\n+ sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n+ System.out.println(sb.toString());\n+ sc.close();\n }\n }\n+\n+class LazySegTree {\n+\n+ private final int N;\n+ private final int SIZE;\n+ private final int LOG;\n+\n+ private final T[] DATA;\n+ private final S[] LAZY;\n+ private final Supplier ET;\n+ private final BinaryOperator OP;\n+ private final Supplier ES;\n+ private final BiFunction MAPPING;\n+ private final BinaryOperator COMPOSITION;\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < n) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = n;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ Arrays.fill(DATA, ET.get());\n+ Arrays.fill(LAZY, ES.get());\n+ }\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ T[] a,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < a.length) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = a.length;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n+ for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n+ for (int i = SIZE - 1; i > 0; i--) update(i);\n+ Arrays.fill(LAZY, ES.get());\n+ }\n+\n+ public void eval(int k) {\n+ DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n+ if (k < SIZE - 1) {\n+ LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n+ LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n+ }\n+ LAZY[k] = ES.get();\n+ }\n+\n+ public T get(int k) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ return DATA[k];\n+ }\n+\n+ public void set(int k, T v) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = v;\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n+ }\n+\n+ private void update(int k) {\n+ DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n+ }\n+\n+ public void apply(int k, S s) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = MAPPING.apply(DATA[k], s);\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n+ }\n+\n+ public void apply(int l, int r, S s) {\n+ apply(l, r, 1, 0, SIZE, s);\n+ }\n+\n+ private void apply(int l, int r, int k, int a, int b, S s) {\n+ eval(k);\n+\n+ if (r <= a || b <= l) return;\n+\n+ if (l <= a && b <= r) {\n+ LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n+ eval(k);\n+ return;\n+ }\n+\n+ apply(l, r, 2 * k, a, (a + b) / 2, s);\n+ apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n+ update(k);\n+ }\n+\n+ public T query(int l, int r) {\n+ return query(l, r, 1, 0, SIZE);\n+ }\n+\n+ public T query(int l, int r, int k, int a, int b) {\n+\n+ if (r <= a || b <= l) return ET.get();\n+ eval(k);\n+\n+ if (l <= a && b <= r) return DATA[k];\n+\n+ T vl = query(l, r, 2 * k, a, (a + b) / 2);\n+ T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n+ return OP.apply(vl, vr);\n+ }\n+}", "output": "FASTER 0.0235", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.0164, "pair_id": "java_2848_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\nclass LazySegTree {\n final int MAX;\n\n final int N;\n final int Log;\n final java.util.function.BinaryOperator Op;\n final S E;\n final java.util.function.BiFunction Mapping;\n final java.util.function.BinaryOperator Composition;\n final F Id;\n\n final S[] Dat;\n final F[] Laz;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this.MAX = n;\n int k = 1;\n while (k < n) k <<= 1;\n this.N = k;\n this.Log = Integer.numberOfTrailingZeros(N);\n this.Op = op;\n this.E = e;\n this.Mapping = mapping;\n this.Composition = composition;\n this.Id = id;\n this.Dat = (S[]) new Object[N << 1];\n this.Laz = (F[]) new Object[N];\n java.util.Arrays.fill(Dat, E);\n java.util.Arrays.fill(Laz, Id);\n }\n\n public LazySegTree(\n S[] dat,\n java.util.function.BinaryOperator op,\n S e,\n java.util.function.BiFunction mapping,\n java.util.function.BinaryOperator composition,\n F id) {\n this(dat.length, op, e, mapping, composition, id);\n build(dat);\n }\n\n private void build(S[] dat) {\n int l = dat.length;\n System.arraycopy(dat, 0, Dat, N, l);\n for (int i = N - 1; i > 0; i--) {\n Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n }\n }\n\n private void push(int k) {\n if (Laz[k] == Id) return;\n int lk = k << 1 | 0, rk = k << 1 | 1;\n Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n Laz[k] = Id;\n }\n\n private void pushTo(int k) {\n for (int i = Log; i > 0; i--) push(k >> i);\n }\n\n private void pushTo(int lk, int rk) {\n for (int i = Log; i > 0; i--) {\n if (((lk >> i) << i) != lk) push(lk >> i);\n if (((rk >> i) << i) != rk) push(rk >> i);\n }\n }\n\n private void updateFrom(int k) {\n k >>= 1;\n while (k > 0) {\n Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n k >>= 1;\n }\n }\n\n private void updateFrom(int lk, int rk) {\n for (int i = 1; i <= Log; i++) {\n if (((lk >> i) << i) != lk) {\n int lki = lk >> i;\n Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n }\n if (((rk >> i) << i) != rk) {\n int rki = (rk - 1) >> i;\n Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n }\n }\n }\n\n public void set(int p, S x) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = x;\n updateFrom(p);\n }\n\n public S get(int p) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n return Dat[p];\n }\n\n public S prod(int l, int r) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return E;\n l += N;\n r += N;\n pushTo(l, r);\n S sumLeft = E, sumRight = E;\n while (l < r) {\n if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n l >>= 1;\n r >>= 1;\n }\n return Op.apply(sumLeft, sumRight);\n }\n\n public S allProd() {\n return Dat[1];\n }\n\n public void apply(int p, F f) {\n exclusiveRangeCheck(p);\n p += N;\n pushTo(p);\n Dat[p] = Mapping.apply(f, Dat[p]);\n updateFrom(p);\n }\n\n public void apply(int l, int r, F f) {\n if (l > r) {\n throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n }\n inclusiveRangeCheck(l);\n inclusiveRangeCheck(r);\n if (l == r) return;\n l += N;\n r += N;\n pushTo(l, r);\n for (int l2 = l, r2 = r; l2 < r2; ) {\n if ((l2 & 1) == 1) {\n Dat[l2] = Mapping.apply(f, Dat[l2]);\n if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n l2++;\n }\n if ((r2 & 1) == 1) {\n r2--;\n Dat[r2] = Mapping.apply(f, Dat[r2]);\n if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n }\n l2 >>= 1;\n r2 >>= 1;\n }\n updateFrom(l, r);\n }\n\n public int maxRight(int l, java.util.function.Predicate g) {\n inclusiveRangeCheck(l);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (l == MAX) return MAX;\n l += N;\n pushTo(l);\n S sum = E;\n do {\n l >>= Integer.numberOfTrailingZeros(l);\n if (!g.test(Op.apply(sum, Dat[l]))) {\n while (l < N) {\n push(l);\n l = l << 1;\n if (g.test(Op.apply(sum, Dat[l]))) {\n sum = Op.apply(sum, Dat[l]);\n l++;\n }\n }\n return l - N;\n }\n sum = Op.apply(sum, Dat[l]);\n l++;\n } while ((l & -l) != l);\n return MAX;\n }\n\n public int minLeft(int r, java.util.function.Predicate g) {\n inclusiveRangeCheck(r);\n if (!g.test(E)) {\n throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n }\n if (r == 0) return 0;\n r += N;\n pushTo(r - 1);\n S sum = E;\n do {\n r--;\n while (r > 1 && (r & 1) == 1) r >>= 1;\n if (!g.test(Op.apply(Dat[r], sum))) {\n while (r < N) {\n push(r);\n r = r << 1 | 1;\n if (g.test(Op.apply(Dat[r], sum))) {\n sum = Op.apply(Dat[r], sum);\n r--;\n }\n }\n return r + 1 - N;\n }\n sum = Op.apply(Dat[r], sum);\n } while ((r & -r) != r);\n return 0;\n }\n\n private void exclusiveRangeCheck(int p) {\n if (p < 0 || p >= MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n }\n }\n\n private void inclusiveRangeCheck(int p) {\n if (p < 0 || p > MAX) {\n throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n }\n }\n}\n\npublic class Main {\n private static class S {\n long zero;\n long one;\n long inv;\n\n public S(long zero, long one, long inv) {\n this.zero = zero;\n this.one = one;\n this.inv = inv;\n }\n\n S swap01() {\n return new S(this.one, this.zero, this.zero * this.one - this.inv);\n }\n\n static S connect(S a, S b) {\n return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n }\n }\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n\n S[] A = new S[N + 1];\n A[0] = new S(0, 0, 0);\n for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n\n LazySegTree seg =\n new LazySegTree(\n A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n\n for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n if (t == 1) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n seg.apply(l, r + 1, true);\n } else if (t == 2) {\n int l = sc.nextInt();\n int r = sc.nextInt();\n System.out.println(seg.prod(l, r + 1).inv);\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.BiFunction;\n-import java.util.function.BinaryOperator;\n-import java.util.function.Supplier;\n+import java.util.*;\n+\n+class LazySegTree {\n+ final int MAX;\n+\n+ final int N;\n+ final int Log;\n+ final java.util.function.BinaryOperator Op;\n+ final S E;\n+ final java.util.function.BiFunction Mapping;\n+ final java.util.function.BinaryOperator Composition;\n+ final F Id;\n+\n+ final S[] Dat;\n+ final F[] Laz;\n+\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this.MAX = n;\n+ int k = 1;\n+ while (k < n) k <<= 1;\n+ this.N = k;\n+ this.Log = Integer.numberOfTrailingZeros(N);\n+ this.Op = op;\n+ this.E = e;\n+ this.Mapping = mapping;\n+ this.Composition = composition;\n+ this.Id = id;\n+ this.Dat = (S[]) new Object[N << 1];\n+ this.Laz = (F[]) new Object[N];\n+ java.util.Arrays.fill(Dat, E);\n+ java.util.Arrays.fill(Laz, Id);\n+ }\n+\n+ public LazySegTree(\n+ S[] dat,\n+ java.util.function.BinaryOperator op,\n+ S e,\n+ java.util.function.BiFunction mapping,\n+ java.util.function.BinaryOperator composition,\n+ F id) {\n+ this(dat.length, op, e, mapping, composition, id);\n+ build(dat);\n+ }\n+\n+ private void build(S[] dat) {\n+ int l = dat.length;\n+ System.arraycopy(dat, 0, Dat, N, l);\n+ for (int i = N - 1; i > 0; i--) {\n+ Dat[i] = Op.apply(Dat[i << 1 | 0], Dat[i << 1 | 1]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ if (Laz[k] == Id) return;\n+ int lk = k << 1 | 0, rk = k << 1 | 1;\n+ Dat[lk] = Mapping.apply(Laz[k], Dat[lk]);\n+ Dat[rk] = Mapping.apply(Laz[k], Dat[rk]);\n+ if (lk < N) Laz[lk] = Composition.apply(Laz[k], Laz[lk]);\n+ if (rk < N) Laz[rk] = Composition.apply(Laz[k], Laz[rk]);\n+ Laz[k] = Id;\n+ }\n+\n+ private void pushTo(int k) {\n+ for (int i = Log; i > 0; i--) push(k >> i);\n+ }\n+\n+ private void pushTo(int lk, int rk) {\n+ for (int i = Log; i > 0; i--) {\n+ if (((lk >> i) << i) != lk) push(lk >> i);\n+ if (((rk >> i) << i) != rk) push(rk >> i);\n+ }\n+ }\n+\n+ private void updateFrom(int k) {\n+ k >>= 1;\n+ while (k > 0) {\n+ Dat[k] = Op.apply(Dat[k << 1 | 0], Dat[k << 1 | 1]);\n+ k >>= 1;\n+ }\n+ }\n+\n+ private void updateFrom(int lk, int rk) {\n+ for (int i = 1; i <= Log; i++) {\n+ if (((lk >> i) << i) != lk) {\n+ int lki = lk >> i;\n+ Dat[lki] = Op.apply(Dat[lki << 1 | 0], Dat[lki << 1 | 1]);\n+ }\n+ if (((rk >> i) << i) != rk) {\n+ int rki = (rk - 1) >> i;\n+ Dat[rki] = Op.apply(Dat[rki << 1 | 0], Dat[rki << 1 | 1]);\n+ }\n+ }\n+ }\n+\n+ public void set(int p, S x) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = x;\n+ updateFrom(p);\n+ }\n+\n+ public S get(int p) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ return Dat[p];\n+ }\n+\n+ public S prod(int l, int r) {\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return E;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ S sumLeft = E, sumRight = E;\n+ while (l < r) {\n+ if ((l & 1) == 1) sumLeft = Op.apply(sumLeft, Dat[l++]);\n+ if ((r & 1) == 1) sumRight = Op.apply(Dat[--r], sumRight);\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ return Op.apply(sumLeft, sumRight);\n+ }\n+\n+ public S allProd() {\n+ return Dat[1];\n+ }\n+\n+ public void apply(int p, F f) {\n+ exclusiveRangeCheck(p);\n+ p += N;\n+ pushTo(p);\n+ Dat[p] = Mapping.apply(f, Dat[p]);\n+ updateFrom(p);\n+ }\n+\n+ public void apply(int l, int r, F f) {\n+ if (l > r) {\n+ throw new IllegalArgumentException(String.format(\"Invalid range: [%d, %d)\", l, r));\n+ }\n+ inclusiveRangeCheck(l);\n+ inclusiveRangeCheck(r);\n+ if (l == r) return;\n+ l += N;\n+ r += N;\n+ pushTo(l, r);\n+ for (int l2 = l, r2 = r; l2 < r2; ) {\n+ if ((l2 & 1) == 1) {\n+ Dat[l2] = Mapping.apply(f, Dat[l2]);\n+ if (l2 < N) Laz[l2] = Composition.apply(f, Laz[l2]);\n+ l2++;\n+ }\n+ if ((r2 & 1) == 1) {\n+ r2--;\n+ Dat[r2] = Mapping.apply(f, Dat[r2]);\n+ if (r2 < N) Laz[r2] = Composition.apply(f, Laz[r2]);\n+ }\n+ l2 >>= 1;\n+ r2 >>= 1;\n+ }\n+ updateFrom(l, r);\n+ }\n+\n+ public int maxRight(int l, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(l);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (l == MAX) return MAX;\n+ l += N;\n+ pushTo(l);\n+ S sum = E;\n+ do {\n+ l >>= Integer.numberOfTrailingZeros(l);\n+ if (!g.test(Op.apply(sum, Dat[l]))) {\n+ while (l < N) {\n+ push(l);\n+ l = l << 1;\n+ if (g.test(Op.apply(sum, Dat[l]))) {\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ }\n+ }\n+ return l - N;\n+ }\n+ sum = Op.apply(sum, Dat[l]);\n+ l++;\n+ } while ((l & -l) != l);\n+ return MAX;\n+ }\n+\n+ public int minLeft(int r, java.util.function.Predicate g) {\n+ inclusiveRangeCheck(r);\n+ if (!g.test(E)) {\n+ throw new IllegalArgumentException(\"Identity element must satisfy the condition.\");\n+ }\n+ if (r == 0) return 0;\n+ r += N;\n+ pushTo(r - 1);\n+ S sum = E;\n+ do {\n+ r--;\n+ while (r > 1 && (r & 1) == 1) r >>= 1;\n+ if (!g.test(Op.apply(Dat[r], sum))) {\n+ while (r < N) {\n+ push(r);\n+ r = r << 1 | 1;\n+ if (g.test(Op.apply(Dat[r], sum))) {\n+ sum = Op.apply(Dat[r], sum);\n+ r--;\n+ }\n+ }\n+ return r + 1 - N;\n+ }\n+ sum = Op.apply(Dat[r], sum);\n+ } while ((r & -r) != r);\n+ return 0;\n+ }\n+\n+ private void exclusiveRangeCheck(int p) {\n+ if (p < 0 || p >= MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d).\", p, 0, MAX));\n+ }\n+ }\n+\n+ private void inclusiveRangeCheck(int p) {\n+ if (p < 0 || p > MAX) {\n+ throw new IndexOutOfBoundsException(String.format(\"Index %d is not in [%d, %d].\", p, 0, MAX));\n+ }\n+ }\n+}\n \n public class Main {\n+ private static class S {\n+ long zero;\n+ long one;\n+ long inv;\n+\n+ public S(long zero, long one, long inv) {\n+ this.zero = zero;\n+ this.one = one;\n+ this.inv = inv;\n+ }\n+\n+ S swap01() {\n+ return new S(this.one, this.zero, this.zero * this.one - this.inv);\n+ }\n+\n+ static S connect(S a, S b) {\n+ return new S(a.zero + b.zero, a.one + b.one, a.inv + b.inv + a.one * b.zero);\n+ }\n+ }\n \n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n- long[][] A = new long[N][3];\n- for (int i = 0; i < N; i++) {\n- int a = sc.nextInt();\n- A[i][a] = 1;\n- }\n- Supplier et = () -> new long[] {0, 0, 0};\n- Supplier es = () -> Boolean.valueOf(false);\n- BinaryOperator op =\n- (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n- @SuppressWarnings(\"resource\")\n- BiFunction mapping =\n- (t, s) -> {\n- if (!s) return t;\n- return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n- };\n- BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n- LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n- StringBuilder sb = new StringBuilder();\n- for (int i = 0; i < Q; i++) {\n+\n+ S[] A = new S[N + 1];\n+ A[0] = new S(0, 0, 0);\n+ for (int n = 1; n <= N; n++) A[n] = sc.nextLong() == 0L ? new S(1, 0, 0) : new S(0, 1, 0);\n+\n+ LazySegTree seg =\n+ new LazySegTree(\n+ A, S::connect, new S(0, 0, 0), (l, r) -> l ? r.swap01() : r, (x, y) -> x ^ y, false);\n+\n+ for (int q = 0; q < Q; q++) {\n int t = sc.nextInt();\n- int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n- seg.apply(l, r, Boolean.valueOf(true));\n- } else {\n- sb.append(seg.query(l, r)[2] + \"\\n\");\n- }\n- }\n- System.out.println(sb.toString());\n- sc.close();\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ seg.apply(l, r + 1, true);\n+ } else if (t == 2) {\n+ int l = sc.nextInt();\n+ int r = sc.nextInt();\n+ System.out.println(seg.prod(l, r + 1).inv);\n+ }\n+ }\n }\n }\n-\n-class LazySegTree {\n-\n- private final int N;\n- private final int SIZE;\n- private final int LOG;\n-\n- private final T[] DATA;\n- private final S[] LAZY;\n- private final Supplier ET;\n- private final BinaryOperator OP;\n- private final Supplier ES;\n- private final BiFunction MAPPING;\n- private final BinaryOperator COMPOSITION;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < n) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = n;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- Arrays.fill(DATA, ET.get());\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- T[] a,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < a.length) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = a.length;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n- for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n- for (int i = SIZE - 1; i > 0; i--) update(i);\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- public void eval(int k) {\n- DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n- if (k < SIZE - 1) {\n- LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n- LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n- }\n- LAZY[k] = ES.get();\n- }\n-\n- public T get(int k) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- return DATA[k];\n- }\n-\n- public void set(int k, T v) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = v;\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- private void update(int k) {\n- DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n- }\n-\n- public void apply(int k, S s) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = MAPPING.apply(DATA[k], s);\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- public void apply(int l, int r, S s) {\n- apply(l, r, 1, 0, SIZE, s);\n- }\n-\n- private void apply(int l, int r, int k, int a, int b, S s) {\n- eval(k);\n-\n- if (r <= a || b <= l) return;\n-\n- if (l <= a && b <= r) {\n- LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n- eval(k);\n- return;\n- }\n-\n- apply(l, r, 2 * k, a, (a + b) / 2, s);\n- apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n- update(k);\n- }\n-\n- public T query(int l, int r) {\n- return query(l, r, 1, 0, SIZE);\n- }\n-\n- public T query(int l, int r, int k, int a, int b) {\n-\n- if (r <= a || b <= l) return ET.get();\n- eval(k);\n-\n- if (l <= a && b <= r) return DATA[k];\n-\n- T vl = query(l, r, 2 * k, a, (a + b) / 2);\n- T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n- return OP.apply(vl, vr);\n- }\n-}", "output": "SLOWER 0.0235", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.0164, "pair_id": "java_2848_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n-import java.util.function.BiFunction;\n-import java.util.function.BinaryOperator;\n-import java.util.function.Supplier;\n+import java.io.*;\n+import java.util.*;\n+\n+class Count {\n+ final long count0, count1, count01, count10;\n+\n+ Count(long count0, long count1, long count01, long count10) {\n+ this.count0 = count0;\n+ this.count1 = count1;\n+ this.count01 = count01;\n+ this.count10 = count10;\n+ }\n+\n+ Count flip() {\n+ return new Count(count1, count0, count10, count01);\n+ }\n+}\n \n public class Main {\n+ private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n+\n+ private static LazySegmentTree.Operator OPERATOR =\n+ new LazySegmentTree.Operator<>() {\n+ @Override\n+ public Count e() {\n+ return COUNT_EMPTY;\n+ }\n+\n+ @Override\n+ public Boolean id() {\n+ return Boolean.valueOf(true);\n+ }\n+\n+ @Override\n+ public Count mapping(Boolean lazyValue, Count value, int count) {\n+ if (lazyValue) {\n+ return value;\n+ }\n+ return value.flip();\n+ }\n+\n+ @Override\n+ public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n+ return newLazy == oldLazy;\n+ }\n+\n+ @Override\n+ public Count op(Count smallIndexValue, Count largeIndexValue) {\n+ long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n+ long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n+ long count01 =\n+ smallIndexValue.count01\n+ + largeIndexValue.count01\n+ + smallIndexValue.count0 * largeIndexValue.count1;\n+ long count10 =\n+ smallIndexValue.count10\n+ + largeIndexValue.count10\n+ + smallIndexValue.count1 * largeIndexValue.count0;\n+ return new Count(count0, count1, count01, count10);\n+ }\n+ };\n+\n+ private static List solve(int n, int q, int[] as, int[][] tlrs) {\n+ Count[] counts = new Count[n];\n+ for (int i = 0; i < n; i++) {\n+ counts[i] = new Count(1 - as[i], as[i], 0, 0);\n+ }\n+ LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n+ List answers = new ArrayList<>();\n+ for (int[] tlr : tlrs) {\n+ int t = tlr[0];\n+ int l = tlr[1] - 1;\n+ int r = tlr[2];\n+ if (t == 1) {\n+ segmentTree.apply(l, r, Boolean.valueOf(false));\n+ } else {\n+ answers.add(segmentTree.prod(l, r).count10);\n+ }\n+ }\n+ return answers;\n+ }\n+\n+ private static void execute(ContestReader reader, ContestWriter out) {\n+ int n = reader.nextInt();\n+ int q = reader.nextInt();\n+ int[] as = reader.nextInt(n);\n+ int[][] tlrs = reader.nextInt(q, 3);\n+ out.printList(solve(n, q, as, tlrs));\n+ }\n \n public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int N = sc.nextInt();\n- int Q = sc.nextInt();\n- long[][] A = new long[N][3];\n- for (int i = 0; i < N; i++) {\n- int a = sc.nextInt();\n- A[i][a] = 1;\n- }\n- Supplier et = () -> new long[] {0, 0, 0};\n- Supplier es = () -> Boolean.valueOf(false);\n- BinaryOperator op =\n- (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n- @SuppressWarnings(\"resource\")\n- BiFunction mapping =\n- (t, s) -> {\n- if (!s) return t;\n- return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n- };\n- BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n- LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ ContestReader reader = new ContestReader(System.in);\n+ ContestWriter out = new ContestWriter(System.out);\n+ execute(reader, out);\n+ out.flush();\n+ }\n+}\n+\n+class ContestWriter extends PrintWriter {\n+ ContestWriter(PrintStream printStream) {\n+ super(printStream);\n+ }\n+\n+ public void printList(List list) {\n+ for (Object object : list) {\n+ println(object);\n+ }\n+ }\n+\n+ public void printListOneLine(List list) {\n+ List stringList = new ArrayList<>();\n+ for (Object object : list) {\n+ stringList.add(object.toString());\n+ }\n+ println(String.join(\" \", stringList));\n+ }\n+}\n+\n+class LazySegmentTree {\n+ public interface Operator {\n+ S e();\n+\n+ F id();\n+\n+ S mapping(F lazyValue, S value, int count);\n+\n+ F composition(F newLazy, F oldLazy);\n+\n+ S op(S smallIndexValue, S largeIndexValue);\n+ }\n+\n+ private final Operator operator;\n+ private final int n, log, size;\n+ private final S[] d;\n+ private final F[] lz;\n+\n+ private static int ceil_pow2(int n) {\n+ int x = 0;\n+ while ((1 << x) < n) {\n+ x++;\n+ }\n+ return x;\n+ }\n+\n+ public LazySegmentTree(Operator operator, S[] v) {\n+ this.operator = operator;\n+ this.n = v.length;\n+ this.log = ceil_pow2(n);\n+ this.size = 1 << log;\n+ this.d = (S[]) new Object[2 * size];\n+ Arrays.fill(this.d, this.operator.e());\n+ this.lz = (F[]) new Object[size];\n+ Arrays.fill(this.lz, this.operator.id());\n+ for (int i = 0; i < n; i++) {\n+ this.d[size + i] = v[i];\n+ }\n+ for (int i = size - 1; i >= 1; i--) {\n+ update(i);\n+ }\n+ }\n+\n+ public void set(int p, S x) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = x;\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n+ }\n+\n+ public S get(int p) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ return d[p];\n+ }\n+\n+ public S prod(int l, int r) {\n+\n+ if (l == r) {\n+ operator.e();\n+ }\n+ l += size;\n+ r += size;\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push(r >> i);\n+ }\n+ }\n+ S lValue = operator.e();\n+ S rValue = operator.e();\n+ while (l < r) {\n+ if ((l & 1) == 1) {\n+ lValue = operator.op(lValue, d[l]);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ rValue = operator.op(d[r], rValue);\n+ }\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ return operator.op(lValue, rValue);\n+ }\n+\n+ public S allProd() {\n+ return d[1];\n+ }\n+\n+ public void apply(int p, F f) {\n+\n+ p += size;\n+ for (int i = log; i >= 1; i--) {\n+ push(p >> i);\n+ }\n+ d[p] = operator.mapping(f, d[p], 1);\n+ for (int i = 1; i <= log; i++) {\n+ update(p >> i);\n+ }\n+ }\n+\n+ public void apply(int l, int r, F f) {\n+\n+ if (l == r) {\n+ return;\n+ }\n+\n+ l += size;\n+ r += size;\n+\n+ for (int i = log; i >= 1; i--) {\n+ if (((l >> i) << i) != l) {\n+ push(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ push((r - 1) >> i);\n+ }\n+ }\n+\n+ {\n+ int l2 = l;\n+ int r2 = r;\n+ while (l < r) {\n+ if ((l & 1) == 1) {\n+ allApply(l, f);\n+ l++;\n+ }\n+ if ((r & 1) == 1) {\n+ r--;\n+ allApply(r, f);\n+ }\n+ l >>= 1;\n+ r >>= 1;\n+ }\n+ l = l2;\n+ r = r2;\n+ }\n+\n+ for (int i = 1; i <= log; i++) {\n+ if (((l >> i) << i) != l) {\n+ update(l >> i);\n+ }\n+ if (((r >> i) << i) != r) {\n+ update((r - 1) >> i);\n+ }\n+ }\n+ }\n+\n+ private void update(int k) {\n+ d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n+ }\n+\n+ private void allApply(int k, F f) {\n+ int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n+\n+ d[k] = this.operator.mapping(f, d[k], count);\n+ if (k < size) {\n+ lz[k] = this.operator.composition(f, lz[k]);\n+ }\n+ }\n+\n+ private void push(int k) {\n+ allApply(2 * k, lz[k]);\n+ allApply(2 * k + 1, lz[k]);\n+ lz[k] = this.operator.id();\n+ }\n+}\n+\n+class ContestReader {\n+ private static final int BUFFER_SIZE = 1024;\n+\n+ private final InputStream stream;\n+ private final byte[] buffer;\n+ private int pointer;\n+ private int bufferLength;\n+\n+ ContestReader(InputStream stream) {\n+ this.stream = stream;\n+ this.buffer = new byte[BUFFER_SIZE];\n+ this.pointer = 0;\n+ this.bufferLength = 0;\n+ }\n+\n+ private boolean hasNextByte() {\n+ if (pointer < bufferLength) {\n+ return true;\n+ }\n+\n+ pointer = 0;\n+ try {\n+ bufferLength = stream.read(buffer);\n+ } catch (IOException e) {\n+ throw new RuntimeException(e);\n+ }\n+ return bufferLength > 0;\n+ }\n+\n+ private int readByte() {\n+ if (hasNextByte()) {\n+ return buffer[pointer++];\n+ } else {\n+ return -1;\n+ }\n+ }\n+\n+ private static boolean isPrintableChar(int c) {\n+ return 33 <= c && c <= 126;\n+ }\n+\n+ public boolean hasNext() {\n+ while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n+ pointer++;\n+ }\n+ return hasNextByte();\n+ }\n+\n+ public String next() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n StringBuilder sb = new StringBuilder();\n- for (int i = 0; i < Q; i++) {\n- int t = sc.nextInt();\n- int l = sc.nextInt() - 1, r = sc.nextInt();\n- if (t == 1) {\n- seg.apply(l, r, Boolean.valueOf(true));\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b)) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public String nextLine() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+ StringBuilder sb = new StringBuilder();\n+ while (true) {\n+ int b = readByte();\n+ if (!isPrintableChar(b) && b != 0x20) {\n+ break;\n+ }\n+ sb.appendCodePoint(b);\n+ }\n+ return sb.toString();\n+ }\n+\n+ public char nextChar() {\n+ return next().charAt(0);\n+ }\n+\n+ public int nextInt() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ int n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n } else {\n- sb.append(seg.query(l, r)[2] + \"\\n\");\n- }\n- }\n- System.out.println(sb.toString());\n- sc.close();\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public long nextLong() {\n+ if (!hasNext()) {\n+ throw new NoSuchElementException();\n+ }\n+\n+ long n = 0;\n+ boolean minus = false;\n+\n+ {\n+ int b = readByte();\n+ if (b == '-') {\n+ minus = true;\n+ } else if ('0' <= b && b <= '9') {\n+ n = b - '0';\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+\n+ while (true) {\n+ int b = readByte();\n+ if ('0' <= b && b <= '9') {\n+ n *= 10;\n+ n += b - '0';\n+ } else if (b == -1 || !isPrintableChar(b)) {\n+ return minus ? -n : n;\n+ } else {\n+ throw new NumberFormatException();\n+ }\n+ }\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String[] next(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = next();\n+ }\n+ return array;\n+ }\n+\n+ public String[] nextLine(int n) {\n+ String[] array = new String[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLine();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextChar(int n) {\n+ char[] array = new char[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextChar();\n+ }\n+ return array;\n+ }\n+\n+ public int[] nextInt(int n) {\n+ int[] array = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextInt();\n+ }\n+ return array;\n+ }\n+\n+ public long[] nextLong(int n) {\n+ long[] array = new long[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextLong();\n+ }\n+ return array;\n+ }\n+\n+ public double[] nextDouble(int n) {\n+ double[] array = new double[n];\n+ for (int i = 0; i < n; i++) {\n+ array[i] = nextDouble();\n+ }\n+ return array;\n+ }\n+\n+ public char[] nextCharArray() {\n+ return next().toCharArray();\n+ }\n+\n+ public String[][] next(int n, int m) {\n+ String[][] matrix = new String[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = next();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public int[][] nextInt(int n, int m) {\n+ int[][] matrix = new int[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextInt();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextChar(int n, int m) {\n+ char[][] matrix = new char[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextChar();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public long[][] nextLong(int n, int m) {\n+ long[][] matrix = new long[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextLong();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public double[][] nextDouble(int n, int m) {\n+ double[][] matrix = new double[n][m];\n+ for (int i = 0; i < n; i++) {\n+ for (int j = 0; j < m; j++) {\n+ matrix[i][j] = nextDouble();\n+ }\n+ }\n+ return matrix;\n+ }\n+\n+ public char[][] nextCharArray(int n) {\n+ char[][] matrix = new char[n][];\n+ for (int i = 0; i < n; i++) {\n+ matrix[i] = next().toCharArray();\n+ }\n+ return matrix;\n }\n }\n \n-class LazySegTree {\n-\n- private final int N;\n- private final int SIZE;\n- private final int LOG;\n-\n- private final T[] DATA;\n- private final S[] LAZY;\n- private final Supplier ET;\n- private final BinaryOperator OP;\n- private final Supplier ES;\n- private final BiFunction MAPPING;\n- private final BinaryOperator COMPOSITION;\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- int n,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < n) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = n;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- Arrays.fill(DATA, ET.get());\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- @SuppressWarnings(\"unchecked\")\n- public LazySegTree(\n- T[] a,\n- Supplier et,\n- BinaryOperator op,\n- Supplier es,\n- BiFunction mapping,\n- BinaryOperator composition) {\n- int tmpSize = 1, tmpLog = 0;\n- while (tmpSize < a.length) {\n- tmpLog++;\n- tmpSize *= 2;\n- }\n- this.N = a.length;\n- this.SIZE = tmpSize;\n- this.LOG = tmpLog;\n- this.DATA = (T[]) new Object[SIZE * 2];\n- this.LAZY = (S[]) new Object[SIZE * 2];\n- this.ET = et;\n- this.OP = op;\n- this.ES = es;\n- this.MAPPING = mapping;\n- this.COMPOSITION = composition;\n- for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n- for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n- for (int i = SIZE - 1; i > 0; i--) update(i);\n- Arrays.fill(LAZY, ES.get());\n- }\n-\n- public void eval(int k) {\n- DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n- if (k < SIZE - 1) {\n- LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n- LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n- }\n- LAZY[k] = ES.get();\n- }\n-\n- public T get(int k) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- return DATA[k];\n- }\n-\n- public void set(int k, T v) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = v;\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- private void update(int k) {\n- DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n- }\n-\n- public void apply(int k, S s) {\n- k += SIZE;\n- for (int i = LOG; i >= 0; i--) eval(k >> i);\n- DATA[k] = MAPPING.apply(DATA[k], s);\n- for (int i = 1; i <= LOG; i++) update(k >> i);\n- }\n-\n- public void apply(int l, int r, S s) {\n- apply(l, r, 1, 0, SIZE, s);\n- }\n-\n- private void apply(int l, int r, int k, int a, int b, S s) {\n- eval(k);\n-\n- if (r <= a || b <= l) return;\n-\n- if (l <= a && b <= r) {\n- LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n- eval(k);\n- return;\n- }\n-\n- apply(l, r, 2 * k, a, (a + b) / 2, s);\n- apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n- update(k);\n- }\n-\n- public T query(int l, int r) {\n- return query(l, r, 1, 0, SIZE);\n- }\n-\n- public T query(int l, int r, int k, int a, int b) {\n-\n- if (r <= a || b <= l) return ET.get();\n- eval(k);\n-\n- if (l <= a && b <= r) return DATA[k];\n-\n- T vl = query(l, r, 2 * k, a, (a + b) / 2);\n- T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n- return OP.apply(vl, vr);\n+class MyAssert {\n+ public static void myAssert(boolean flag, String message) {\n+ if (!flag) {\n+ throw new RuntimeException(message);\n+ }\n+ }\n+\n+ public static void myAssert(boolean flag) {\n+ myAssert(flag, \"\");\n }\n }", "output": "FASTER 0.8398", "problem_id": "p02569", "direction": "forward", "speedup_ratio": 1.7898, "pair_id": "java_2844_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\nclass Count {\n final long count0, count1, count01, count10;\n\n Count(long count0, long count1, long count01, long count10) {\n this.count0 = count0;\n this.count1 = count1;\n this.count01 = count01;\n this.count10 = count10;\n }\n\n Count flip() {\n return new Count(count1, count0, count10, count01);\n }\n}\n\npublic class Main {\n private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n\n private static LazySegmentTree.Operator OPERATOR =\n new LazySegmentTree.Operator<>() {\n @Override\n public Count e() {\n return COUNT_EMPTY;\n }\n\n @Override\n public Boolean id() {\n return Boolean.valueOf(true);\n }\n\n @Override\n public Count mapping(Boolean lazyValue, Count value, int count) {\n if (lazyValue) {\n return value;\n }\n return value.flip();\n }\n\n @Override\n public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n return newLazy == oldLazy;\n }\n\n @Override\n public Count op(Count smallIndexValue, Count largeIndexValue) {\n long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n long count01 =\n smallIndexValue.count01\n + largeIndexValue.count01\n + smallIndexValue.count0 * largeIndexValue.count1;\n long count10 =\n smallIndexValue.count10\n + largeIndexValue.count10\n + smallIndexValue.count1 * largeIndexValue.count0;\n return new Count(count0, count1, count01, count10);\n }\n };\n\n private static List solve(int n, int q, int[] as, int[][] tlrs) {\n Count[] counts = new Count[n];\n for (int i = 0; i < n; i++) {\n counts[i] = new Count(1 - as[i], as[i], 0, 0);\n }\n LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n List answers = new ArrayList<>();\n for (int[] tlr : tlrs) {\n int t = tlr[0];\n int l = tlr[1] - 1;\n int r = tlr[2];\n if (t == 1) {\n segmentTree.apply(l, r, Boolean.valueOf(false));\n } else {\n answers.add(segmentTree.prod(l, r).count10);\n }\n }\n return answers;\n }\n\n private static void execute(ContestReader reader, ContestWriter out) {\n int n = reader.nextInt();\n int q = reader.nextInt();\n int[] as = reader.nextInt(n);\n int[][] tlrs = reader.nextInt(q, 3);\n out.printList(solve(n, q, as, tlrs));\n }\n\n public static void main(String[] args) {\n ContestReader reader = new ContestReader(System.in);\n ContestWriter out = new ContestWriter(System.out);\n execute(reader, out);\n out.flush();\n }\n}\n\nclass ContestWriter extends PrintWriter {\n ContestWriter(PrintStream printStream) {\n super(printStream);\n }\n\n public void printList(List list) {\n for (Object object : list) {\n println(object);\n }\n }\n\n public void printListOneLine(List list) {\n List stringList = new ArrayList<>();\n for (Object object : list) {\n stringList.add(object.toString());\n }\n println(String.join(\" \", stringList));\n }\n}\n\nclass LazySegmentTree {\n public interface Operator {\n S e();\n\n F id();\n\n S mapping(F lazyValue, S value, int count);\n\n F composition(F newLazy, F oldLazy);\n\n S op(S smallIndexValue, S largeIndexValue);\n }\n\n private final Operator operator;\n private final int n, log, size;\n private final S[] d;\n private final F[] lz;\n\n private static int ceil_pow2(int n) {\n int x = 0;\n while ((1 << x) < n) {\n x++;\n }\n return x;\n }\n\n public LazySegmentTree(Operator operator, S[] v) {\n this.operator = operator;\n this.n = v.length;\n this.log = ceil_pow2(n);\n this.size = 1 << log;\n this.d = (S[]) new Object[2 * size];\n Arrays.fill(this.d, this.operator.e());\n this.lz = (F[]) new Object[size];\n Arrays.fill(this.lz, this.operator.id());\n for (int i = 0; i < n; i++) {\n this.d[size + i] = v[i];\n }\n for (int i = size - 1; i >= 1; i--) {\n update(i);\n }\n }\n\n public void set(int p, S x) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = x;\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public S get(int p) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n return d[p];\n }\n\n public S prod(int l, int r) {\n\n if (l == r) {\n operator.e();\n }\n l += size;\n r += size;\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push(r >> i);\n }\n }\n S lValue = operator.e();\n S rValue = operator.e();\n while (l < r) {\n if ((l & 1) == 1) {\n lValue = operator.op(lValue, d[l]);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n rValue = operator.op(d[r], rValue);\n }\n l >>= 1;\n r >>= 1;\n }\n return operator.op(lValue, rValue);\n }\n\n public S allProd() {\n return d[1];\n }\n\n public void apply(int p, F f) {\n\n p += size;\n for (int i = log; i >= 1; i--) {\n push(p >> i);\n }\n d[p] = operator.mapping(f, d[p], 1);\n for (int i = 1; i <= log; i++) {\n update(p >> i);\n }\n }\n\n public void apply(int l, int r, F f) {\n\n if (l == r) {\n return;\n }\n\n l += size;\n r += size;\n\n for (int i = log; i >= 1; i--) {\n if (((l >> i) << i) != l) {\n push(l >> i);\n }\n if (((r >> i) << i) != r) {\n push((r - 1) >> i);\n }\n }\n\n {\n int l2 = l;\n int r2 = r;\n while (l < r) {\n if ((l & 1) == 1) {\n allApply(l, f);\n l++;\n }\n if ((r & 1) == 1) {\n r--;\n allApply(r, f);\n }\n l >>= 1;\n r >>= 1;\n }\n l = l2;\n r = r2;\n }\n\n for (int i = 1; i <= log; i++) {\n if (((l >> i) << i) != l) {\n update(l >> i);\n }\n if (((r >> i) << i) != r) {\n update((r - 1) >> i);\n }\n }\n }\n\n private void update(int k) {\n d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n }\n\n private void allApply(int k, F f) {\n int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n\n d[k] = this.operator.mapping(f, d[k], count);\n if (k < size) {\n lz[k] = this.operator.composition(f, lz[k]);\n }\n }\n\n private void push(int k) {\n allApply(2 * k, lz[k]);\n allApply(2 * k + 1, lz[k]);\n lz[k] = this.operator.id();\n }\n}\n\nclass ContestReader {\n private static final int BUFFER_SIZE = 1024;\n\n private final InputStream stream;\n private final byte[] buffer;\n private int pointer;\n private int bufferLength;\n\n ContestReader(InputStream stream) {\n this.stream = stream;\n this.buffer = new byte[BUFFER_SIZE];\n this.pointer = 0;\n this.bufferLength = 0;\n }\n\n private boolean hasNextByte() {\n if (pointer < bufferLength) {\n return true;\n }\n\n pointer = 0;\n try {\n bufferLength = stream.read(buffer);\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n return bufferLength > 0;\n }\n\n private int readByte() {\n if (hasNextByte()) {\n return buffer[pointer++];\n } else {\n return -1;\n }\n }\n\n private static boolean isPrintableChar(int c) {\n return 33 <= c && c <= 126;\n }\n\n public boolean hasNext() {\n while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n pointer++;\n }\n return hasNextByte();\n }\n\n public String next() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b)) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public String nextLine() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n StringBuilder sb = new StringBuilder();\n while (true) {\n int b = readByte();\n if (!isPrintableChar(b) && b != 0x20) {\n break;\n }\n sb.appendCodePoint(b);\n }\n return sb.toString();\n }\n\n public char nextChar() {\n return next().charAt(0);\n }\n\n public int nextInt() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n int n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public long nextLong() {\n if (!hasNext()) {\n throw new NoSuchElementException();\n }\n\n long n = 0;\n boolean minus = false;\n\n {\n int b = readByte();\n if (b == '-') {\n minus = true;\n } else if ('0' <= b && b <= '9') {\n n = b - '0';\n } else {\n throw new NumberFormatException();\n }\n }\n\n while (true) {\n int b = readByte();\n if ('0' <= b && b <= '9') {\n n *= 10;\n n += b - '0';\n } else if (b == -1 || !isPrintableChar(b)) {\n return minus ? -n : n;\n } else {\n throw new NumberFormatException();\n }\n }\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String[] next(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = next();\n }\n return array;\n }\n\n public String[] nextLine(int n) {\n String[] array = new String[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLine();\n }\n return array;\n }\n\n public char[] nextChar(int n) {\n char[] array = new char[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextChar();\n }\n return array;\n }\n\n public int[] nextInt(int n) {\n int[] array = new int[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextInt();\n }\n return array;\n }\n\n public long[] nextLong(int n) {\n long[] array = new long[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextLong();\n }\n return array;\n }\n\n public double[] nextDouble(int n) {\n double[] array = new double[n];\n for (int i = 0; i < n; i++) {\n array[i] = nextDouble();\n }\n return array;\n }\n\n public char[] nextCharArray() {\n return next().toCharArray();\n }\n\n public String[][] next(int n, int m) {\n String[][] matrix = new String[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = next();\n }\n }\n return matrix;\n }\n\n public int[][] nextInt(int n, int m) {\n int[][] matrix = new int[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextInt();\n }\n }\n return matrix;\n }\n\n public char[][] nextChar(int n, int m) {\n char[][] matrix = new char[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextChar();\n }\n }\n return matrix;\n }\n\n public long[][] nextLong(int n, int m) {\n long[][] matrix = new long[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextLong();\n }\n }\n return matrix;\n }\n\n public double[][] nextDouble(int n, int m) {\n double[][] matrix = new double[n][m];\n for (int i = 0; i < n; i++) {\n for (int j = 0; j < m; j++) {\n matrix[i][j] = nextDouble();\n }\n }\n return matrix;\n }\n\n public char[][] nextCharArray(int n) {\n char[][] matrix = new char[n][];\n for (int i = 0; i < n; i++) {\n matrix[i] = next().toCharArray();\n }\n return matrix;\n }\n}\n\nclass MyAssert {\n public static void myAssert(boolean flag, String message) {\n if (!flag) {\n throw new RuntimeException(message);\n }\n }\n\n public static void myAssert(boolean flag) {\n myAssert(flag, \"\");\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\nimport java.util.function.BiFunction;\nimport java.util.function.BinaryOperator;\nimport java.util.function.Supplier;\n\npublic class Main {\n\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int N = sc.nextInt();\n int Q = sc.nextInt();\n long[][] A = new long[N][3];\n for (int i = 0; i < N; i++) {\n int a = sc.nextInt();\n A[i][a] = 1;\n }\n Supplier et = () -> new long[] {0, 0, 0};\n Supplier es = () -> Boolean.valueOf(false);\n BinaryOperator op =\n (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n @SuppressWarnings(\"resource\")\n BiFunction mapping =\n (t, s) -> {\n if (!s) return t;\n return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n };\n BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n StringBuilder sb = new StringBuilder();\n for (int i = 0; i < Q; i++) {\n int t = sc.nextInt();\n int l = sc.nextInt() - 1, r = sc.nextInt();\n if (t == 1) {\n seg.apply(l, r, Boolean.valueOf(true));\n } else {\n sb.append(seg.query(l, r)[2] + \"\\n\");\n }\n }\n System.out.println(sb.toString());\n sc.close();\n }\n}\n\nclass LazySegTree {\n\n private final int N;\n private final int SIZE;\n private final int LOG;\n\n private final T[] DATA;\n private final S[] LAZY;\n private final Supplier ET;\n private final BinaryOperator OP;\n private final Supplier ES;\n private final BiFunction MAPPING;\n private final BinaryOperator COMPOSITION;\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n int n,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < n) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = n;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n Arrays.fill(DATA, ET.get());\n Arrays.fill(LAZY, ES.get());\n }\n\n @SuppressWarnings(\"unchecked\")\n public LazySegTree(\n T[] a,\n Supplier et,\n BinaryOperator op,\n Supplier es,\n BiFunction mapping,\n BinaryOperator composition) {\n int tmpSize = 1, tmpLog = 0;\n while (tmpSize < a.length) {\n tmpLog++;\n tmpSize *= 2;\n }\n this.N = a.length;\n this.SIZE = tmpSize;\n this.LOG = tmpLog;\n this.DATA = (T[]) new Object[SIZE * 2];\n this.LAZY = (S[]) new Object[SIZE * 2];\n this.ET = et;\n this.OP = op;\n this.ES = es;\n this.MAPPING = mapping;\n this.COMPOSITION = composition;\n for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n for (int i = SIZE - 1; i > 0; i--) update(i);\n Arrays.fill(LAZY, ES.get());\n }\n\n public void eval(int k) {\n DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n if (k < SIZE - 1) {\n LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n }\n LAZY[k] = ES.get();\n }\n\n public T get(int k) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n return DATA[k];\n }\n\n public void set(int k, T v) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = v;\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n private void update(int k) {\n DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n\n public void apply(int k, S s) {\n k += SIZE;\n for (int i = LOG; i >= 0; i--) eval(k >> i);\n DATA[k] = MAPPING.apply(DATA[k], s);\n for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n\n public void apply(int l, int r, S s) {\n apply(l, r, 1, 0, SIZE, s);\n }\n\n private void apply(int l, int r, int k, int a, int b, S s) {\n eval(k);\n\n if (r <= a || b <= l) return;\n\n if (l <= a && b <= r) {\n LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n eval(k);\n return;\n }\n\n apply(l, r, 2 * k, a, (a + b) / 2, s);\n apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n update(k);\n }\n\n public T query(int l, int r) {\n return query(l, r, 1, 0, SIZE);\n }\n\n public T query(int l, int r, int k, int a, int b) {\n\n if (r <= a || b <= l) return ET.get();\n eval(k);\n\n if (l <= a && b <= r) return DATA[k];\n\n T vl = query(l, r, 2 * k, a, (a + b) / 2);\n T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n return OP.apply(vl, vr);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n+import java.util.function.BiFunction;\n+import java.util.function.BinaryOperator;\n+import java.util.function.Supplier;\n \n-class Count {\n- final long count0, count1, count01, count10;\n+public class Main {\n \n- Count(long count0, long count1, long count01, long count10) {\n- this.count0 = count0;\n- this.count1 = count1;\n- this.count01 = count01;\n- this.count10 = count10;\n- }\n-\n- Count flip() {\n- return new Count(count1, count0, count10, count01);\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int N = sc.nextInt();\n+ int Q = sc.nextInt();\n+ long[][] A = new long[N][3];\n+ for (int i = 0; i < N; i++) {\n+ int a = sc.nextInt();\n+ A[i][a] = 1;\n+ }\n+ Supplier et = () -> new long[] {0, 0, 0};\n+ Supplier es = () -> Boolean.valueOf(false);\n+ BinaryOperator op =\n+ (l, r) -> new long[] {l[0] + r[0], l[1] + r[1], l[2] + r[2] + l[1] * r[0]};\n+ @SuppressWarnings(\"resource\")\n+ BiFunction mapping =\n+ (t, s) -> {\n+ if (!s) return t;\n+ return new long[] {t[1], t[0], t[0] * t[1] - t[2]};\n+ };\n+ BinaryOperator composition = (a, b) -> Boolean.logicalXor(a, b);\n+ LazySegTree seg = new LazySegTree<>(A, et, op, es, mapping, composition);\n+ StringBuilder sb = new StringBuilder();\n+ for (int i = 0; i < Q; i++) {\n+ int t = sc.nextInt();\n+ int l = sc.nextInt() - 1, r = sc.nextInt();\n+ if (t == 1) {\n+ seg.apply(l, r, Boolean.valueOf(true));\n+ } else {\n+ sb.append(seg.query(l, r)[2] + \"\\n\");\n+ }\n+ }\n+ System.out.println(sb.toString());\n+ sc.close();\n }\n }\n \n-public class Main {\n- private static Count COUNT_EMPTY = new Count(0, 0, 0, 0);\n+class LazySegTree {\n \n- private static LazySegmentTree.Operator OPERATOR =\n- new LazySegmentTree.Operator<>() {\n- @Override\n- public Count e() {\n- return COUNT_EMPTY;\n- }\n+ private final int N;\n+ private final int SIZE;\n+ private final int LOG;\n \n- @Override\n- public Boolean id() {\n- return Boolean.valueOf(true);\n- }\n+ private final T[] DATA;\n+ private final S[] LAZY;\n+ private final Supplier ET;\n+ private final BinaryOperator OP;\n+ private final Supplier ES;\n+ private final BiFunction MAPPING;\n+ private final BinaryOperator COMPOSITION;\n \n- @Override\n- public Count mapping(Boolean lazyValue, Count value, int count) {\n- if (lazyValue) {\n- return value;\n- }\n- return value.flip();\n- }\n-\n- @Override\n- public Boolean composition(Boolean newLazy, Boolean oldLazy) {\n- return newLazy == oldLazy;\n- }\n-\n- @Override\n- public Count op(Count smallIndexValue, Count largeIndexValue) {\n- long count0 = smallIndexValue.count0 + largeIndexValue.count0;\n- long count1 = smallIndexValue.count1 + largeIndexValue.count1;\n- long count01 =\n- smallIndexValue.count01\n- + largeIndexValue.count01\n- + smallIndexValue.count0 * largeIndexValue.count1;\n- long count10 =\n- smallIndexValue.count10\n- + largeIndexValue.count10\n- + smallIndexValue.count1 * largeIndexValue.count0;\n- return new Count(count0, count1, count01, count10);\n- }\n- };\n-\n- private static List solve(int n, int q, int[] as, int[][] tlrs) {\n- Count[] counts = new Count[n];\n- for (int i = 0; i < n; i++) {\n- counts[i] = new Count(1 - as[i], as[i], 0, 0);\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ int n,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < n) {\n+ tmpLog++;\n+ tmpSize *= 2;\n }\n- LazySegmentTree segmentTree = new LazySegmentTree<>(OPERATOR, counts);\n- List answers = new ArrayList<>();\n- for (int[] tlr : tlrs) {\n- int t = tlr[0];\n- int l = tlr[1] - 1;\n- int r = tlr[2];\n- if (t == 1) {\n- segmentTree.apply(l, r, Boolean.valueOf(false));\n- } else {\n- answers.add(segmentTree.prod(l, r).count10);\n- }\n- }\n- return answers;\n+ this.N = n;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ Arrays.fill(DATA, ET.get());\n+ Arrays.fill(LAZY, ES.get());\n }\n \n- private static void execute(ContestReader reader, ContestWriter out) {\n- int n = reader.nextInt();\n- int q = reader.nextInt();\n- int[] as = reader.nextInt(n);\n- int[][] tlrs = reader.nextInt(q, 3);\n- out.printList(solve(n, q, as, tlrs));\n+ @SuppressWarnings(\"unchecked\")\n+ public LazySegTree(\n+ T[] a,\n+ Supplier et,\n+ BinaryOperator op,\n+ Supplier es,\n+ BiFunction mapping,\n+ BinaryOperator composition) {\n+ int tmpSize = 1, tmpLog = 0;\n+ while (tmpSize < a.length) {\n+ tmpLog++;\n+ tmpSize *= 2;\n+ }\n+ this.N = a.length;\n+ this.SIZE = tmpSize;\n+ this.LOG = tmpLog;\n+ this.DATA = (T[]) new Object[SIZE * 2];\n+ this.LAZY = (S[]) new Object[SIZE * 2];\n+ this.ET = et;\n+ this.OP = op;\n+ this.ES = es;\n+ this.MAPPING = mapping;\n+ this.COMPOSITION = composition;\n+ for (int i = 0; i < N; i++) DATA[i + SIZE] = a[i];\n+ for (int i = N; i < SIZE; i++) DATA[i + SIZE] = ET.get();\n+ for (int i = SIZE - 1; i > 0; i--) update(i);\n+ Arrays.fill(LAZY, ES.get());\n }\n \n- public static void main(String[] args) {\n- ContestReader reader = new ContestReader(System.in);\n- ContestWriter out = new ContestWriter(System.out);\n- execute(reader, out);\n- out.flush();\n- }\n-}\n-\n-class ContestWriter extends PrintWriter {\n- ContestWriter(PrintStream printStream) {\n- super(printStream);\n+ public void eval(int k) {\n+ DATA[k] = MAPPING.apply(DATA[k], LAZY[k]);\n+ if (k < SIZE - 1) {\n+ LAZY[2 * k] = COMPOSITION.apply(LAZY[k], LAZY[2 * k]);\n+ LAZY[2 * k + 1] = COMPOSITION.apply(LAZY[k], LAZY[2 * k + 1]);\n+ }\n+ LAZY[k] = ES.get();\n }\n \n- public void printList(List list) {\n- for (Object object : list) {\n- println(object);\n- }\n+ public T get(int k) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ return DATA[k];\n }\n \n- public void printListOneLine(List list) {\n- List stringList = new ArrayList<>();\n- for (Object object : list) {\n- stringList.add(object.toString());\n- }\n- println(String.join(\" \", stringList));\n- }\n-}\n-\n-class LazySegmentTree {\n- public interface Operator {\n- S e();\n-\n- F id();\n-\n- S mapping(F lazyValue, S value, int count);\n-\n- F composition(F newLazy, F oldLazy);\n-\n- S op(S smallIndexValue, S largeIndexValue);\n+ public void set(int k, T v) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = v;\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n- private final Operator operator;\n- private final int n, log, size;\n- private final S[] d;\n- private final F[] lz;\n-\n- private static int ceil_pow2(int n) {\n- int x = 0;\n- while ((1 << x) < n) {\n- x++;\n- }\n- return x;\n+ private void update(int k) {\n+ DATA[k] = OP.apply(DATA[k * 2], DATA[k * 2 + 1]);\n }\n \n- public LazySegmentTree(Operator operator, S[] v) {\n- this.operator = operator;\n- this.n = v.length;\n- this.log = ceil_pow2(n);\n- this.size = 1 << log;\n- this.d = (S[]) new Object[2 * size];\n- Arrays.fill(this.d, this.operator.e());\n- this.lz = (F[]) new Object[size];\n- Arrays.fill(this.lz, this.operator.id());\n- for (int i = 0; i < n; i++) {\n- this.d[size + i] = v[i];\n- }\n- for (int i = size - 1; i >= 1; i--) {\n- update(i);\n- }\n+ public void apply(int k, S s) {\n+ k += SIZE;\n+ for (int i = LOG; i >= 0; i--) eval(k >> i);\n+ DATA[k] = MAPPING.apply(DATA[k], s);\n+ for (int i = 1; i <= LOG; i++) update(k >> i);\n }\n \n- public void set(int p, S x) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = x;\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n+ public void apply(int l, int r, S s) {\n+ apply(l, r, 1, 0, SIZE, s);\n }\n \n- public S get(int p) {\n+ private void apply(int l, int r, int k, int a, int b, S s) {\n+ eval(k);\n \n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- return d[p];\n- }\n+ if (r <= a || b <= l) return;\n \n- public S prod(int l, int r) {\n-\n- if (l == r) {\n- operator.e();\n- }\n- l += size;\n- r += size;\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push(r >> i);\n- }\n- }\n- S lValue = operator.e();\n- S rValue = operator.e();\n- while (l < r) {\n- if ((l & 1) == 1) {\n- lValue = operator.op(lValue, d[l]);\n- l++;\n- }\n- if ((r & 1) == 1) {\n- r--;\n- rValue = operator.op(d[r], rValue);\n- }\n- l >>= 1;\n- r >>= 1;\n- }\n- return operator.op(lValue, rValue);\n- }\n-\n- public S allProd() {\n- return d[1];\n- }\n-\n- public void apply(int p, F f) {\n-\n- p += size;\n- for (int i = log; i >= 1; i--) {\n- push(p >> i);\n- }\n- d[p] = operator.mapping(f, d[p], 1);\n- for (int i = 1; i <= log; i++) {\n- update(p >> i);\n- }\n- }\n-\n- public void apply(int l, int r, F f) {\n-\n- if (l == r) {\n+ if (l <= a && b <= r) {\n+ LAZY[k] = COMPOSITION.apply(LAZY[k], s);\n+ eval(k);\n return;\n }\n \n- l += size;\n- r += size;\n-\n- for (int i = log; i >= 1; i--) {\n- if (((l >> i) << i) != l) {\n- push(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- push((r - 1) >> i);\n- }\n- }\n-\n- {\n- int l2 = l;\n- int r2 = r;\n- while (l < r) {\n- if ((l & 1) == 1) {\n- allApply(l, f);\n- l++;\n- }\n- if ((r & 1) == 1) {\n- r--;\n- allApply(r, f);\n- }\n- l >>= 1;\n- r >>= 1;\n- }\n- l = l2;\n- r = r2;\n- }\n-\n- for (int i = 1; i <= log; i++) {\n- if (((l >> i) << i) != l) {\n- update(l >> i);\n- }\n- if (((r >> i) << i) != r) {\n- update((r - 1) >> i);\n- }\n- }\n+ apply(l, r, 2 * k, a, (a + b) / 2, s);\n+ apply(l, r, 2 * k + 1, (a + b) / 2, b, s);\n+ update(k);\n }\n \n- private void update(int k) {\n- d[k] = this.operator.op(d[2 * k], d[2 * k + 1]);\n+ public T query(int l, int r) {\n+ return query(l, r, 1, 0, SIZE);\n }\n \n- private void allApply(int k, F f) {\n- int count = 1 << (Integer.numberOfLeadingZeros(k) - 31 + log);\n+ public T query(int l, int r, int k, int a, int b) {\n \n- d[k] = this.operator.mapping(f, d[k], count);\n- if (k < size) {\n- lz[k] = this.operator.composition(f, lz[k]);\n- }\n- }\n+ if (r <= a || b <= l) return ET.get();\n+ eval(k);\n \n- private void push(int k) {\n- allApply(2 * k, lz[k]);\n- allApply(2 * k + 1, lz[k]);\n- lz[k] = this.operator.id();\n+ if (l <= a && b <= r) return DATA[k];\n+\n+ T vl = query(l, r, 2 * k, a, (a + b) / 2);\n+ T vr = query(l, r, 2 * k + 1, (a + b) / 2, b);\n+ return OP.apply(vl, vr);\n }\n }\n-\n-class ContestReader {\n- private static final int BUFFER_SIZE = 1024;\n-\n- private final InputStream stream;\n- private final byte[] buffer;\n- private int pointer;\n- private int bufferLength;\n-\n- ContestReader(InputStream stream) {\n- this.stream = stream;\n- this.buffer = new byte[BUFFER_SIZE];\n- this.pointer = 0;\n- this.bufferLength = 0;\n- }\n-\n- private boolean hasNextByte() {\n- if (pointer < bufferLength) {\n- return true;\n- }\n-\n- pointer = 0;\n- try {\n- bufferLength = stream.read(buffer);\n- } catch (IOException e) {\n- throw new RuntimeException(e);\n- }\n- return bufferLength > 0;\n- }\n-\n- private int readByte() {\n- if (hasNextByte()) {\n- return buffer[pointer++];\n- } else {\n- return -1;\n- }\n- }\n-\n- private static boolean isPrintableChar(int c) {\n- return 33 <= c && c <= 126;\n- }\n-\n- public boolean hasNext() {\n- while (hasNextByte() && !isPrintableChar(buffer[pointer])) {\n- pointer++;\n- }\n- return hasNextByte();\n- }\n-\n- public String next() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b)) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public String nextLine() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n- StringBuilder sb = new StringBuilder();\n- while (true) {\n- int b = readByte();\n- if (!isPrintableChar(b) && b != 0x20) {\n- break;\n- }\n- sb.appendCodePoint(b);\n- }\n- return sb.toString();\n- }\n-\n- public char nextChar() {\n- return next().charAt(0);\n- }\n-\n- public int nextInt() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- int n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public long nextLong() {\n- if (!hasNext()) {\n- throw new NoSuchElementException();\n- }\n-\n- long n = 0;\n- boolean minus = false;\n-\n- {\n- int b = readByte();\n- if (b == '-') {\n- minus = true;\n- } else if ('0' <= b && b <= '9') {\n- n = b - '0';\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n-\n- while (true) {\n- int b = readByte();\n- if ('0' <= b && b <= '9') {\n- n *= 10;\n- n += b - '0';\n- } else if (b == -1 || !isPrintableChar(b)) {\n- return minus ? -n : n;\n- } else {\n- throw new NumberFormatException();\n- }\n- }\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String[] next(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = next();\n- }\n- return array;\n- }\n-\n- public String[] nextLine(int n) {\n- String[] array = new String[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLine();\n- }\n- return array;\n- }\n-\n- public char[] nextChar(int n) {\n- char[] array = new char[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextChar();\n- }\n- return array;\n- }\n-\n- public int[] nextInt(int n) {\n- int[] array = new int[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextInt();\n- }\n- return array;\n- }\n-\n- public long[] nextLong(int n) {\n- long[] array = new long[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextLong();\n- }\n- return array;\n- }\n-\n- public double[] nextDouble(int n) {\n- double[] array = new double[n];\n- for (int i = 0; i < n; i++) {\n- array[i] = nextDouble();\n- }\n- return array;\n- }\n-\n- public char[] nextCharArray() {\n- return next().toCharArray();\n- }\n-\n- public String[][] next(int n, int m) {\n- String[][] matrix = new String[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = next();\n- }\n- }\n- return matrix;\n- }\n-\n- public int[][] nextInt(int n, int m) {\n- int[][] matrix = new int[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextInt();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextChar(int n, int m) {\n- char[][] matrix = new char[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextChar();\n- }\n- }\n- return matrix;\n- }\n-\n- public long[][] nextLong(int n, int m) {\n- long[][] matrix = new long[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextLong();\n- }\n- }\n- return matrix;\n- }\n-\n- public double[][] nextDouble(int n, int m) {\n- double[][] matrix = new double[n][m];\n- for (int i = 0; i < n; i++) {\n- for (int j = 0; j < m; j++) {\n- matrix[i][j] = nextDouble();\n- }\n- }\n- return matrix;\n- }\n-\n- public char[][] nextCharArray(int n) {\n- char[][] matrix = new char[n][];\n- for (int i = 0; i < n; i++) {\n- matrix[i] = next().toCharArray();\n- }\n- return matrix;\n- }\n-}\n-\n-class MyAssert {\n- public static void myAssert(boolean flag, String message) {\n- if (!flag) {\n- throw new RuntimeException(message);\n- }\n- }\n-\n- public static void myAssert(boolean flag) {\n- myAssert(flag, \"\");\n- }\n-}", "output": "SLOWER 0.8398", "problem_id": "p02569", "direction": "reversed", "speedup_ratio": 1.7898, "pair_id": "java_2844_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import static java.lang.Math.*;\n+\n import java.util.*;\n \n-public class Solution {\n- class Edge {\n- int from, to, cp;\n- Edge next;\n+public class C {\n+ public static void main(String[] args) {\n+ long t1 = System.currentTimeMillis();\n+ Scanner in = new Scanner(System.in);\n+ N = in.nextInt();\n+ idmap = new HashMap();\n+ V = new boolean[N];\n+ S = new PriorityQueue[N];\n+ G = new ArrayList[N];\n+ for (int i = 0; i < N; i++) {\n+ int a = in.nextInt();\n+ idmap.put(a, i);\n+ G[i] = new ArrayList();\n+ S[i] = new PriorityQueue();\n+ S[i].add(a);\n+ }\n+ for (int i = 0; i < N - 1; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ int c = in.nextInt();\n+ G[a].add(new Edge(b, c));\n+ G[b].add(new Edge(a, c));\n+ }\n \n- public Edge(int from, int to, int cp) {\n- this.from = from;\n- this.to = to;\n- this.cp = cp;\n+ ans = new int[N];\n+ long t2 = System.currentTimeMillis();\n+ int left = N;\n+ for (time = 0; ; time++) {\n+ while (S[0].size() > 0) {\n+ int p = S[0].poll();\n+ ans[idmap.get(p)] = time;\n+ left--;\n+ }\n+ if (left == 0) break;\n+ Arrays.fill(V, false);\n+ recur(0, -1, 0);\n+ }\n+ long t3 = System.currentTimeMillis();\n+ StringBuilder an = new StringBuilder(\"\");\n+ for (int a : ans) an.append(a + \" \");\n+ System.out.println(an.toString().trim());\n+ long t4 = System.currentTimeMillis();\n+ System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n+ }\n+\n+ static void recur(int at, int prev, int cap) {\n+ V[at] = true;\n+ while (cap > 0 && S[at].size() > 0) {\n+ int f = S[at].poll();\n+ S[prev].add(f);\n+ cap--;\n+ }\n+ for (int i = 0; i < G[at].size(); i++) {\n+ Edge e = G[at].get(i);\n+ if (V[e.to]) {\n+ G[at].remove(i);\n+ i--;\n+ continue;\n+ }\n+ recur(e.to, at, e.cap);\n }\n }\n \n- Edge[] adj;\n+ static int[] ans;\n+ static PriorityQueue[] S, NS;\n+ static boolean[] V;\n+ static int N, time;\n+ static HashMap idmap;\n+ static ArrayList[] G;\n \n- void addEdge(int from, int to, int cp) {\n- Edge a = new Edge(from, to, cp);\n- Edge b = new Edge(to, from, cp);\n- a.next = adj[from];\n- b.next = adj[to];\n- adj[from] = a;\n- adj[to] = b;\n- }\n+ private static class Edge {\n+ int to, cap;\n \n- int[] par;\n- int[] cp;\n-\n- void dfs(int v, int p) {\n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- par[e.to] = v;\n- cp[e.to] = e.cp;\n- dfs(e.to, v);\n- }\n- e = e.next;\n+ public Edge(int to, int cap) {\n+ this.to = to;\n+ this.cap = cap;\n }\n }\n-\n- PriorityQueue[] queues;\n-\n- void dfs1(int v, int p) {\n- if (v != 0) {\n- int can = cp[v];\n- while (can > 0 && !queues[v].isEmpty()) {\n- int pp = queues[v].poll();\n- queues[par[v]].add(pp);\n- can--;\n- }\n- }\n-\n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- dfs1(e.to, v);\n- }\n- e = e.next;\n- }\n- }\n-\n- public void go() throws Exception {\n- Scanner sc = new Scanner(new InputStreamReader(System.in));\n- int n = sc.nextInt();\n- int[] pri = new int[n];\n- Map idByPri = new HashMap();\n- for (int i = 0; i < n; i++) {\n- pri[i] = sc.nextInt();\n- idByPri.put(pri[i], i);\n- }\n- adj = new Edge[n];\n- for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n- sc.close();\n-\n- par = new int[n];\n- cp = new int[n];\n- dfs(0, -1);\n-\n- queues = new PriorityQueue[n];\n- for (int i = 0; i < n; i++) {\n- queues[i] = new PriorityQueue();\n- queues[i].add(pri[i]);\n- }\n-\n- int[] ans = new int[n];\n- int left = n;\n- for (int time = 0; ; time++) {\n- while (!queues[0].isEmpty()) {\n- int pp = queues[0].poll();\n- left--;\n- ans[idByPri.get(pp)] = time;\n- }\n- if (left == 0) break;\n- dfs1(0, -1);\n- }\n-\n- for (int i = 0; i < n; i++) {\n- System.out.print(ans[i]);\n- if (i + 1 < n) System.out.print(\" \");\n- }\n- System.out.println();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- (new Solution()).go();\n- }\n }", "output": "FASTER 0.0745", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 1.053, "pair_id": "java_10333_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.lang.Math.*;\n-\n+import java.io.*;\n import java.util.*;\n \n-public class C {\n- public static void main(String[] args) {\n- long t1 = System.currentTimeMillis();\n- Scanner in = new Scanner(System.in);\n- N = in.nextInt();\n- idmap = new HashMap();\n- V = new boolean[N];\n- S = new PriorityQueue[N];\n- G = new ArrayList[N];\n- for (int i = 0; i < N; i++) {\n- int a = in.nextInt();\n- idmap.put(a, i);\n- G[i] = new ArrayList();\n- S[i] = new PriorityQueue();\n- S[i].add(a);\n- }\n- for (int i = 0; i < N - 1; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- int c = in.nextInt();\n- G[a].add(new Edge(b, c));\n- G[b].add(new Edge(a, c));\n- }\n+public class Solution {\n+ class Edge {\n+ int from, to, cp;\n+ Edge next;\n \n- ans = new int[N];\n- long t2 = System.currentTimeMillis();\n- int left = N;\n- for (time = 0; ; time++) {\n- while (S[0].size() > 0) {\n- int p = S[0].poll();\n- ans[idmap.get(p)] = time;\n- left--;\n- }\n- if (left == 0) break;\n- Arrays.fill(V, false);\n- recur(0, -1, 0);\n- }\n- long t3 = System.currentTimeMillis();\n- StringBuilder an = new StringBuilder(\"\");\n- for (int a : ans) an.append(a + \" \");\n- System.out.println(an.toString().trim());\n- long t4 = System.currentTimeMillis();\n- System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n- }\n-\n- static void recur(int at, int prev, int cap) {\n- V[at] = true;\n- while (cap > 0 && S[at].size() > 0) {\n- int f = S[at].poll();\n- S[prev].add(f);\n- cap--;\n- }\n- for (int i = 0; i < G[at].size(); i++) {\n- Edge e = G[at].get(i);\n- if (V[e.to]) {\n- G[at].remove(i);\n- i--;\n- continue;\n- }\n- recur(e.to, at, e.cap);\n+ public Edge(int from, int to, int cp) {\n+ this.from = from;\n+ this.to = to;\n+ this.cp = cp;\n }\n }\n \n- static int[] ans;\n- static PriorityQueue[] S, NS;\n- static boolean[] V;\n- static int N, time;\n- static HashMap idmap;\n- static ArrayList[] G;\n+ Edge[] adj;\n \n- private static class Edge {\n- int to, cap;\n+ void addEdge(int from, int to, int cp) {\n+ Edge a = new Edge(from, to, cp);\n+ Edge b = new Edge(to, from, cp);\n+ a.next = adj[from];\n+ b.next = adj[to];\n+ adj[from] = a;\n+ adj[to] = b;\n+ }\n \n- public Edge(int to, int cap) {\n- this.to = to;\n- this.cap = cap;\n+ int[] par;\n+ int[] cp;\n+\n+ void dfs(int v, int p) {\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ par[e.to] = v;\n+ cp[e.to] = e.cp;\n+ dfs(e.to, v);\n+ }\n+ e = e.next;\n }\n }\n+\n+ PriorityQueue[] queues;\n+\n+ void dfs1(int v, int p) {\n+ if (v != 0) {\n+ int can = cp[v];\n+ while (can > 0 && !queues[v].isEmpty()) {\n+ int pp = queues[v].poll();\n+ queues[par[v]].add(pp);\n+ can--;\n+ }\n+ }\n+\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ dfs1(e.to, v);\n+ }\n+ e = e.next;\n+ }\n+ }\n+\n+ public void go() throws Exception {\n+ Scanner sc = new Scanner(new InputStreamReader(System.in));\n+ int n = sc.nextInt();\n+ int[] pri = new int[n];\n+ Map idByPri = new HashMap();\n+ for (int i = 0; i < n; i++) {\n+ pri[i] = sc.nextInt();\n+ idByPri.put(pri[i], i);\n+ }\n+ adj = new Edge[n];\n+ for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n+ sc.close();\n+\n+ par = new int[n];\n+ cp = new int[n];\n+ dfs(0, -1);\n+\n+ queues = new PriorityQueue[n];\n+ for (int i = 0; i < n; i++) {\n+ queues[i] = new PriorityQueue();\n+ queues[i].add(pri[i]);\n+ }\n+\n+ int[] ans = new int[n];\n+ int left = n;\n+ for (int time = 0; ; time++) {\n+ while (!queues[0].isEmpty()) {\n+ int pp = queues[0].poll();\n+ left--;\n+ ans[idByPri.get(pp)] = time;\n+ }\n+ if (left == 0) break;\n+ dfs1(0, -1);\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ System.out.print(ans[i]);\n+ if (i + 1 < n) System.out.print(\" \");\n+ }\n+ System.out.println();\n+ }\n+\n+ public static void main(String[] args) throws Exception {\n+ (new Solution()).go();\n+ }\n }", "output": "SLOWER 0.0745", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 1.053, "pair_id": "java_10333_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Solution implements Runnable {\n+public class Solution {\n+ class Edge {\n+ int from, to, cp;\n+ Edge next;\n \n- private StringTokenizer st;\n- private BufferedReader in;\n- private PrintWriter out;\n- private ArrayList[] edges;\n- private int[] p;\n- private int[] c;\n-\n- static class Edge {\n- int u, v, c;\n-\n- Edge(int u, int v, int c) {\n- this.u = u;\n- this.v = v;\n- this.c = c;\n+ public Edge(int from, int to, int cp) {\n+ this.from = from;\n+ this.to = to;\n+ this.cp = cp;\n }\n }\n \n- public void solve() throws IOException {\n- int n = nextInt();\n- final int[] a = new int[n];\n- edges = new ArrayList[n];\n- for (int i = 0; i < n; ++i) {\n- edges[i] = new ArrayList();\n- a[i] = nextInt();\n- }\n- for (int i = 0; i < n - 1; ++i) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- int c = nextInt();\n- edges[u].add(new Edge(u, v, c));\n- edges[v].add(new Edge(v, u, c));\n- }\n- p = new int[n];\n- c = new int[n];\n- p[0] = -1;\n- dfs(0, null);\n- Integer[] ind = new Integer[n];\n- int[] pos = new int[n];\n- for (int i = 0; i < n; ++i) {\n- ind[i] = pos[i] = i;\n- }\n- Arrays.sort(\n- ind,\n- new Comparator() {\n- public int compare(Integer o1, Integer o2) {\n- return a[o1] - a[o2];\n- }\n- });\n- int[] ans = new int[n];\n- while (true) {\n- boolean ok = true;\n- int[] cap = c.clone();\n- for (int i : ind) {\n- if (pos[i] != 0) {\n- ans[i]++;\n- if (cap[pos[i]] > 0) {\n- cap[pos[i]]--;\n- pos[i] = p[pos[i]];\n- }\n- ok = false;\n- }\n- }\n- if (ok) {\n- break;\n- }\n- }\n- for (int i : ans) {\n- out.print(i + \" \");\n- }\n- out.println();\n+ Edge[] adj;\n+\n+ void addEdge(int from, int to, int cp) {\n+ Edge a = new Edge(from, to, cp);\n+ Edge b = new Edge(to, from, cp);\n+ a.next = adj[from];\n+ b.next = adj[to];\n+ adj[from] = a;\n+ adj[to] = b;\n }\n \n- private void dfs(int i, Edge e) {\n- if (e != null) {\n- p[i] = e.u;\n- c[i] = e.c;\n- }\n- for (Edge e1 : edges[i]) {\n- if (e == null || e1.v != e.u) {\n- dfs(e1.v, e1);\n+ int[] par;\n+ int[] cp;\n+\n+ void dfs(int v, int p) {\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ par[e.to] = v;\n+ cp[e.to] = e.cp;\n+ dfs(e.to, v);\n }\n+ e = e.next;\n }\n }\n \n- public void run() {\n- try {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- eat(\"\");\n+ PriorityQueue[] queues;\n \n- solve();\n+ void dfs1(int v, int p) {\n+ if (v != 0) {\n+ int can = cp[v];\n+ while (can > 0 && !queues[v].isEmpty()) {\n+ int pp = queues[v].poll();\n+ queues[par[v]].add(pp);\n+ can--;\n+ }\n+ }\n \n- out.close();\n- } catch (Exception e) {\n- e.printStackTrace();\n- failed = true;\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ dfs1(e.to, v);\n+ }\n+ e = e.next;\n }\n }\n \n- void eat(String s) {\n- st = new StringTokenizer(s);\n+ public void go() throws Exception {\n+ Scanner sc = new Scanner(new InputStreamReader(System.in));\n+ int n = sc.nextInt();\n+ int[] pri = new int[n];\n+ Map idByPri = new HashMap();\n+ for (int i = 0; i < n; i++) {\n+ pri[i] = sc.nextInt();\n+ idByPri.put(pri[i], i);\n+ }\n+ adj = new Edge[n];\n+ for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n+ sc.close();\n+\n+ par = new int[n];\n+ cp = new int[n];\n+ dfs(0, -1);\n+\n+ queues = new PriorityQueue[n];\n+ for (int i = 0; i < n; i++) {\n+ queues[i] = new PriorityQueue();\n+ queues[i].add(pri[i]);\n+ }\n+\n+ int[] ans = new int[n];\n+ int left = n;\n+ for (int time = 0; ; time++) {\n+ while (!queues[0].isEmpty()) {\n+ int pp = queues[0].poll();\n+ left--;\n+ ans[idByPri.get(pp)] = time;\n+ }\n+ if (left == 0) break;\n+ dfs1(0, -1);\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ System.out.print(ans[i]);\n+ if (i + 1 < n) System.out.print(\" \");\n+ }\n+ System.out.println();\n }\n \n- String next() throws IOException {\n- while (!st.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- eat(line);\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static boolean failed = false;\n-\n- public static void main(String[] args) {\n- Locale.setDefault(Locale.US);\n- Thread th = new Thread(new Solution());\n- th.start();\n- try {\n- th.join();\n- } catch (InterruptedException iex) {\n- }\n- if (failed) {\n- throw new RuntimeException();\n- }\n+ public static void main(String[] args) throws Exception {\n+ (new Solution()).go();\n }\n }", "output": "FASTER 3.4364", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 10.8255, "pair_id": "java_10337_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.*;\n import java.util.*;\n \n-public class Solution {\n- class Edge {\n- int from, to, cp;\n- Edge next;\n+public class Solution implements Runnable {\n \n- public Edge(int from, int to, int cp) {\n- this.from = from;\n- this.to = to;\n- this.cp = cp;\n+ private StringTokenizer st;\n+ private BufferedReader in;\n+ private PrintWriter out;\n+ private ArrayList[] edges;\n+ private int[] p;\n+ private int[] c;\n+\n+ static class Edge {\n+ int u, v, c;\n+\n+ Edge(int u, int v, int c) {\n+ this.u = u;\n+ this.v = v;\n+ this.c = c;\n }\n }\n \n- Edge[] adj;\n-\n- void addEdge(int from, int to, int cp) {\n- Edge a = new Edge(from, to, cp);\n- Edge b = new Edge(to, from, cp);\n- a.next = adj[from];\n- b.next = adj[to];\n- adj[from] = a;\n- adj[to] = b;\n+ public void solve() throws IOException {\n+ int n = nextInt();\n+ final int[] a = new int[n];\n+ edges = new ArrayList[n];\n+ for (int i = 0; i < n; ++i) {\n+ edges[i] = new ArrayList();\n+ a[i] = nextInt();\n+ }\n+ for (int i = 0; i < n - 1; ++i) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ int c = nextInt();\n+ edges[u].add(new Edge(u, v, c));\n+ edges[v].add(new Edge(v, u, c));\n+ }\n+ p = new int[n];\n+ c = new int[n];\n+ p[0] = -1;\n+ dfs(0, null);\n+ Integer[] ind = new Integer[n];\n+ int[] pos = new int[n];\n+ for (int i = 0; i < n; ++i) {\n+ ind[i] = pos[i] = i;\n+ }\n+ Arrays.sort(\n+ ind,\n+ new Comparator() {\n+ public int compare(Integer o1, Integer o2) {\n+ return a[o1] - a[o2];\n+ }\n+ });\n+ int[] ans = new int[n];\n+ while (true) {\n+ boolean ok = true;\n+ int[] cap = c.clone();\n+ for (int i : ind) {\n+ if (pos[i] != 0) {\n+ ans[i]++;\n+ if (cap[pos[i]] > 0) {\n+ cap[pos[i]]--;\n+ pos[i] = p[pos[i]];\n+ }\n+ ok = false;\n+ }\n+ }\n+ if (ok) {\n+ break;\n+ }\n+ }\n+ for (int i : ans) {\n+ out.print(i + \" \");\n+ }\n+ out.println();\n }\n \n- int[] par;\n- int[] cp;\n-\n- void dfs(int v, int p) {\n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- par[e.to] = v;\n- cp[e.to] = e.cp;\n- dfs(e.to, v);\n+ private void dfs(int i, Edge e) {\n+ if (e != null) {\n+ p[i] = e.u;\n+ c[i] = e.c;\n+ }\n+ for (Edge e1 : edges[i]) {\n+ if (e == null || e1.v != e.u) {\n+ dfs(e1.v, e1);\n }\n- e = e.next;\n }\n }\n \n- PriorityQueue[] queues;\n+ public void run() {\n+ try {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ eat(\"\");\n \n- void dfs1(int v, int p) {\n- if (v != 0) {\n- int can = cp[v];\n- while (can > 0 && !queues[v].isEmpty()) {\n- int pp = queues[v].poll();\n- queues[par[v]].add(pp);\n- can--;\n- }\n- }\n+ solve();\n \n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- dfs1(e.to, v);\n- }\n- e = e.next;\n+ out.close();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ failed = true;\n }\n }\n \n- public void go() throws Exception {\n- Scanner sc = new Scanner(new InputStreamReader(System.in));\n- int n = sc.nextInt();\n- int[] pri = new int[n];\n- Map idByPri = new HashMap();\n- for (int i = 0; i < n; i++) {\n- pri[i] = sc.nextInt();\n- idByPri.put(pri[i], i);\n- }\n- adj = new Edge[n];\n- for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n- sc.close();\n-\n- par = new int[n];\n- cp = new int[n];\n- dfs(0, -1);\n-\n- queues = new PriorityQueue[n];\n- for (int i = 0; i < n; i++) {\n- queues[i] = new PriorityQueue();\n- queues[i].add(pri[i]);\n- }\n-\n- int[] ans = new int[n];\n- int left = n;\n- for (int time = 0; ; time++) {\n- while (!queues[0].isEmpty()) {\n- int pp = queues[0].poll();\n- left--;\n- ans[idByPri.get(pp)] = time;\n- }\n- if (left == 0) break;\n- dfs1(0, -1);\n- }\n-\n- for (int i = 0; i < n; i++) {\n- System.out.print(ans[i]);\n- if (i + 1 < n) System.out.print(\" \");\n- }\n- System.out.println();\n+ void eat(String s) {\n+ st = new StringTokenizer(s);\n }\n \n- public static void main(String[] args) throws Exception {\n- (new Solution()).go();\n+ String next() throws IOException {\n+ while (!st.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ eat(line);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static boolean failed = false;\n+\n+ public static void main(String[] args) {\n+ Locale.setDefault(Locale.US);\n+ Thread th = new Thread(new Solution());\n+ th.start();\n+ try {\n+ th.join();\n+ } catch (InterruptedException iex) {\n+ }\n+ if (failed) {\n+ throw new RuntimeException();\n+ }\n }\n }", "output": "SLOWER 3.4364", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 10.8255, "pair_id": "java_10337_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.Queue;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class GeneralMobilization {\n+public class Solution {\n+ class Edge {\n+ int from, to, cp;\n+ Edge next;\n \n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- City[] city = new City[n];\n- Devesion[] dev = new Devesion[n];\n+ public Edge(int from, int to, int cp) {\n+ this.from = from;\n+ this.to = to;\n+ this.cp = cp;\n+ }\n+ }\n \n- for (int i = 0; i < n; i++) {\n- dev[i] = new Devesion(in.nextInt());\n- city[i] = new City(dev[i]);\n+ Edge[] adj;\n+\n+ void addEdge(int from, int to, int cp) {\n+ Edge a = new Edge(from, to, cp);\n+ Edge b = new Edge(to, from, cp);\n+ a.next = adj[from];\n+ b.next = adj[to];\n+ adj[from] = a;\n+ adj[to] = b;\n+ }\n+\n+ int[] par;\n+ int[] cp;\n+\n+ void dfs(int v, int p) {\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ par[e.to] = v;\n+ cp[e.to] = e.cp;\n+ dfs(e.to, v);\n+ }\n+ e = e.next;\n }\n- for (int i = 1; i < n; i++) {\n- int x = in.nextInt() - 1, y = in.nextInt() - 1;\n- if (city[y].capacity != 0) {\n- int t = x;\n- x = y;\n- y = t;\n- }\n- city[x].children.add(city[y]);\n- city[y].capacity = in.nextInt();\n- }\n+ }\n \n- Queue queue = new LinkedList<>();\n- while (city[0].devs.size() < n) {\n- queue.add(city[0]);\n- while (!queue.isEmpty()) {\n- City node = queue.remove();\n- for (int k = 0; k < node.children.size(); k++) {\n- City c = node.children.get(k);\n- queue.add(c);\n- if (c.devs.isEmpty()) {\n- node.children.remove(k--);\n- continue;\n- }\n+ PriorityQueue[] queues;\n \n- Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n- for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n- c.devs.get(j).time++;\n- if (i < c.capacity) {\n- node.devs.add(c.devs.get(0));\n- c.devs.remove(0);\n- j--;\n- }\n- }\n- }\n+ void dfs1(int v, int p) {\n+ if (v != 0) {\n+ int can = cp[v];\n+ while (can > 0 && !queues[v].isEmpty()) {\n+ int pp = queues[v].poll();\n+ queues[par[v]].add(pp);\n+ can--;\n }\n }\n \n- for (Devesion d : dev) {\n- System.out.println(d.time);\n+ Edge e = adj[v];\n+ while (e != null) {\n+ if (e.to != p) {\n+ dfs1(e.to, v);\n+ }\n+ e = e.next;\n }\n }\n \n- static class Devesion {\n+ public void go() throws Exception {\n+ Scanner sc = new Scanner(new InputStreamReader(System.in));\n+ int n = sc.nextInt();\n+ int[] pri = new int[n];\n+ Map idByPri = new HashMap();\n+ for (int i = 0; i < n; i++) {\n+ pri[i] = sc.nextInt();\n+ idByPri.put(pri[i], i);\n+ }\n+ adj = new Edge[n];\n+ for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n+ sc.close();\n \n- int per, time;\n+ par = new int[n];\n+ cp = new int[n];\n+ dfs(0, -1);\n \n- public Devesion(int per) {\n- this.per = per;\n+ queues = new PriorityQueue[n];\n+ for (int i = 0; i < n; i++) {\n+ queues[i] = new PriorityQueue();\n+ queues[i].add(pri[i]);\n }\n+\n+ int[] ans = new int[n];\n+ int left = n;\n+ for (int time = 0; ; time++) {\n+ while (!queues[0].isEmpty()) {\n+ int pp = queues[0].poll();\n+ left--;\n+ ans[idByPri.get(pp)] = time;\n+ }\n+ if (left == 0) break;\n+ dfs1(0, -1);\n+ }\n+\n+ for (int i = 0; i < n; i++) {\n+ System.out.print(ans[i]);\n+ if (i + 1 < n) System.out.print(\" \");\n+ }\n+ System.out.println();\n }\n \n- static class City {\n-\n- int capacity;\n- ArrayList children;\n- ArrayList devs;\n-\n- public City(Devesion i) {\n- children = new ArrayList<>();\n- devs = new ArrayList<>();\n- devs.add(i);\n- }\n+ public static void main(String[] args) throws Exception {\n+ (new Solution()).go();\n }\n }", "output": "FASTER 0.0429", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 1.0302, "pair_id": "java_10336_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution {\n class Edge {\n int from, to, cp;\n Edge next;\n\n public Edge(int from, int to, int cp) {\n this.from = from;\n this.to = to;\n this.cp = cp;\n }\n }\n\n Edge[] adj;\n\n void addEdge(int from, int to, int cp) {\n Edge a = new Edge(from, to, cp);\n Edge b = new Edge(to, from, cp);\n a.next = adj[from];\n b.next = adj[to];\n adj[from] = a;\n adj[to] = b;\n }\n\n int[] par;\n int[] cp;\n\n void dfs(int v, int p) {\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n par[e.to] = v;\n cp[e.to] = e.cp;\n dfs(e.to, v);\n }\n e = e.next;\n }\n }\n\n PriorityQueue[] queues;\n\n void dfs1(int v, int p) {\n if (v != 0) {\n int can = cp[v];\n while (can > 0 && !queues[v].isEmpty()) {\n int pp = queues[v].poll();\n queues[par[v]].add(pp);\n can--;\n }\n }\n\n Edge e = adj[v];\n while (e != null) {\n if (e.to != p) {\n dfs1(e.to, v);\n }\n e = e.next;\n }\n }\n\n public void go() throws Exception {\n Scanner sc = new Scanner(new InputStreamReader(System.in));\n int n = sc.nextInt();\n int[] pri = new int[n];\n Map idByPri = new HashMap();\n for (int i = 0; i < n; i++) {\n pri[i] = sc.nextInt();\n idByPri.put(pri[i], i);\n }\n adj = new Edge[n];\n for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n sc.close();\n\n par = new int[n];\n cp = new int[n];\n dfs(0, -1);\n\n queues = new PriorityQueue[n];\n for (int i = 0; i < n; i++) {\n queues[i] = new PriorityQueue();\n queues[i].add(pri[i]);\n }\n\n int[] ans = new int[n];\n int left = n;\n for (int time = 0; ; time++) {\n while (!queues[0].isEmpty()) {\n int pp = queues[0].poll();\n left--;\n ans[idByPri.get(pp)] = time;\n }\n if (left == 0) break;\n dfs1(0, -1);\n }\n\n for (int i = 0; i < n; i++) {\n System.out.print(ans[i]);\n if (i + 1 < n) System.out.print(\" \");\n }\n System.out.println();\n }\n\n public static void main(String[] args) throws Exception {\n (new Solution()).go();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.Queue;\n+import java.util.Scanner;\n \n-public class Solution {\n- class Edge {\n- int from, to, cp;\n- Edge next;\n+public class GeneralMobilization {\n \n- public Edge(int from, int to, int cp) {\n- this.from = from;\n- this.to = to;\n- this.cp = cp;\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ City[] city = new City[n];\n+ Devesion[] dev = new Devesion[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ dev[i] = new Devesion(in.nextInt());\n+ city[i] = new City(dev[i]);\n+ }\n+ for (int i = 1; i < n; i++) {\n+ int x = in.nextInt() - 1, y = in.nextInt() - 1;\n+ if (city[y].capacity != 0) {\n+ int t = x;\n+ x = y;\n+ y = t;\n+ }\n+ city[x].children.add(city[y]);\n+ city[y].capacity = in.nextInt();\n+ }\n+\n+ Queue queue = new LinkedList<>();\n+ while (city[0].devs.size() < n) {\n+ queue.add(city[0]);\n+ while (!queue.isEmpty()) {\n+ City node = queue.remove();\n+ for (int k = 0; k < node.children.size(); k++) {\n+ City c = node.children.get(k);\n+ queue.add(c);\n+ if (c.devs.isEmpty()) {\n+ node.children.remove(k--);\n+ continue;\n+ }\n+\n+ Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n+ for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n+ c.devs.get(j).time++;\n+ if (i < c.capacity) {\n+ node.devs.add(c.devs.get(0));\n+ c.devs.remove(0);\n+ j--;\n+ }\n+ }\n+ }\n+ }\n+ }\n+\n+ for (Devesion d : dev) {\n+ System.out.println(d.time);\n }\n }\n \n- Edge[] adj;\n+ static class Devesion {\n \n- void addEdge(int from, int to, int cp) {\n- Edge a = new Edge(from, to, cp);\n- Edge b = new Edge(to, from, cp);\n- a.next = adj[from];\n- b.next = adj[to];\n- adj[from] = a;\n- adj[to] = b;\n- }\n+ int per, time;\n \n- int[] par;\n- int[] cp;\n-\n- void dfs(int v, int p) {\n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- par[e.to] = v;\n- cp[e.to] = e.cp;\n- dfs(e.to, v);\n- }\n- e = e.next;\n+ public Devesion(int per) {\n+ this.per = per;\n }\n }\n \n- PriorityQueue[] queues;\n+ static class City {\n \n- void dfs1(int v, int p) {\n- if (v != 0) {\n- int can = cp[v];\n- while (can > 0 && !queues[v].isEmpty()) {\n- int pp = queues[v].poll();\n- queues[par[v]].add(pp);\n- can--;\n- }\n- }\n+ int capacity;\n+ ArrayList children;\n+ ArrayList devs;\n \n- Edge e = adj[v];\n- while (e != null) {\n- if (e.to != p) {\n- dfs1(e.to, v);\n- }\n- e = e.next;\n+ public City(Devesion i) {\n+ children = new ArrayList<>();\n+ devs = new ArrayList<>();\n+ devs.add(i);\n }\n }\n-\n- public void go() throws Exception {\n- Scanner sc = new Scanner(new InputStreamReader(System.in));\n- int n = sc.nextInt();\n- int[] pri = new int[n];\n- Map idByPri = new HashMap();\n- for (int i = 0; i < n; i++) {\n- pri[i] = sc.nextInt();\n- idByPri.put(pri[i], i);\n- }\n- adj = new Edge[n];\n- for (int i = 0; i < n - 1; i++) addEdge(sc.nextInt() - 1, sc.nextInt() - 1, sc.nextInt());\n- sc.close();\n-\n- par = new int[n];\n- cp = new int[n];\n- dfs(0, -1);\n-\n- queues = new PriorityQueue[n];\n- for (int i = 0; i < n; i++) {\n- queues[i] = new PriorityQueue();\n- queues[i].add(pri[i]);\n- }\n-\n- int[] ans = new int[n];\n- int left = n;\n- for (int time = 0; ; time++) {\n- while (!queues[0].isEmpty()) {\n- int pp = queues[0].poll();\n- left--;\n- ans[idByPri.get(pp)] = time;\n- }\n- if (left == 0) break;\n- dfs1(0, -1);\n- }\n-\n- for (int i = 0; i < n; i++) {\n- System.out.print(ans[i]);\n- if (i + 1 < n) System.out.print(\" \");\n- }\n- System.out.println();\n- }\n-\n- public static void main(String[] args) throws Exception {\n- (new Solution()).go();\n- }\n }", "output": "SLOWER 0.0429", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 1.0302, "pair_id": "java_10336_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import static java.lang.Math.*;\n+\n import java.util.*;\n \n-public class Solution implements Runnable {\n+public class C {\n+ public static void main(String[] args) {\n+ long t1 = System.currentTimeMillis();\n+ Scanner in = new Scanner(System.in);\n+ N = in.nextInt();\n+ idmap = new HashMap();\n+ V = new boolean[N];\n+ S = new PriorityQueue[N];\n+ G = new ArrayList[N];\n+ for (int i = 0; i < N; i++) {\n+ int a = in.nextInt();\n+ idmap.put(a, i);\n+ G[i] = new ArrayList();\n+ S[i] = new PriorityQueue();\n+ S[i].add(a);\n+ }\n+ for (int i = 0; i < N - 1; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ int c = in.nextInt();\n+ G[a].add(new Edge(b, c));\n+ G[b].add(new Edge(a, c));\n+ }\n \n- private StringTokenizer st;\n- private BufferedReader in;\n- private PrintWriter out;\n- private ArrayList[] edges;\n- private int[] p;\n- private int[] c;\n+ ans = new int[N];\n+ long t2 = System.currentTimeMillis();\n+ int left = N;\n+ for (time = 0; ; time++) {\n+ while (S[0].size() > 0) {\n+ int p = S[0].poll();\n+ ans[idmap.get(p)] = time;\n+ left--;\n+ }\n+ if (left == 0) break;\n+ Arrays.fill(V, false);\n+ recur(0, -1, 0);\n+ }\n+ long t3 = System.currentTimeMillis();\n+ StringBuilder an = new StringBuilder(\"\");\n+ for (int a : ans) an.append(a + \" \");\n+ System.out.println(an.toString().trim());\n+ long t4 = System.currentTimeMillis();\n+ System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n+ }\n \n- static class Edge {\n- int u, v, c;\n-\n- Edge(int u, int v, int c) {\n- this.u = u;\n- this.v = v;\n- this.c = c;\n+ static void recur(int at, int prev, int cap) {\n+ V[at] = true;\n+ while (cap > 0 && S[at].size() > 0) {\n+ int f = S[at].poll();\n+ S[prev].add(f);\n+ cap--;\n+ }\n+ for (int i = 0; i < G[at].size(); i++) {\n+ Edge e = G[at].get(i);\n+ if (V[e.to]) {\n+ G[at].remove(i);\n+ i--;\n+ continue;\n+ }\n+ recur(e.to, at, e.cap);\n }\n }\n \n- public void solve() throws IOException {\n- int n = nextInt();\n- final int[] a = new int[n];\n- edges = new ArrayList[n];\n- for (int i = 0; i < n; ++i) {\n- edges[i] = new ArrayList();\n- a[i] = nextInt();\n- }\n- for (int i = 0; i < n - 1; ++i) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- int c = nextInt();\n- edges[u].add(new Edge(u, v, c));\n- edges[v].add(new Edge(v, u, c));\n- }\n- p = new int[n];\n- c = new int[n];\n- p[0] = -1;\n- dfs(0, null);\n- Integer[] ind = new Integer[n];\n- int[] pos = new int[n];\n- for (int i = 0; i < n; ++i) {\n- ind[i] = pos[i] = i;\n- }\n- Arrays.sort(\n- ind,\n- new Comparator() {\n- public int compare(Integer o1, Integer o2) {\n- return a[o1] - a[o2];\n- }\n- });\n- int[] ans = new int[n];\n- while (true) {\n- boolean ok = true;\n- int[] cap = c.clone();\n- for (int i : ind) {\n- if (pos[i] != 0) {\n- ans[i]++;\n- if (cap[pos[i]] > 0) {\n- cap[pos[i]]--;\n- pos[i] = p[pos[i]];\n- }\n- ok = false;\n- }\n- }\n- if (ok) {\n- break;\n- }\n- }\n- for (int i : ans) {\n- out.print(i + \" \");\n- }\n- out.println();\n- }\n+ static int[] ans;\n+ static PriorityQueue[] S, NS;\n+ static boolean[] V;\n+ static int N, time;\n+ static HashMap idmap;\n+ static ArrayList[] G;\n \n- private void dfs(int i, Edge e) {\n- if (e != null) {\n- p[i] = e.u;\n- c[i] = e.c;\n- }\n- for (Edge e1 : edges[i]) {\n- if (e == null || e1.v != e.u) {\n- dfs(e1.v, e1);\n- }\n- }\n- }\n+ private static class Edge {\n+ int to, cap;\n \n- public void run() {\n- try {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- eat(\"\");\n-\n- solve();\n-\n- out.close();\n- } catch (Exception e) {\n- e.printStackTrace();\n- failed = true;\n- }\n- }\n-\n- void eat(String s) {\n- st = new StringTokenizer(s);\n- }\n-\n- String next() throws IOException {\n- while (!st.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- eat(line);\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static boolean failed = false;\n-\n- public static void main(String[] args) {\n- Locale.setDefault(Locale.US);\n- Thread th = new Thread(new Solution());\n- th.start();\n- try {\n- th.join();\n- } catch (InterruptedException iex) {\n- }\n- if (failed) {\n- throw new RuntimeException();\n+ public Edge(int to, int cap) {\n+ this.to = to;\n+ this.cap = cap;\n }\n }\n }", "output": "FASTER 3.5109", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 11.3994, "pair_id": "java_10335_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.lang.Math.*;\n-\n+import java.io.*;\n import java.util.*;\n \n-public class C {\n- public static void main(String[] args) {\n- long t1 = System.currentTimeMillis();\n- Scanner in = new Scanner(System.in);\n- N = in.nextInt();\n- idmap = new HashMap();\n- V = new boolean[N];\n- S = new PriorityQueue[N];\n- G = new ArrayList[N];\n- for (int i = 0; i < N; i++) {\n- int a = in.nextInt();\n- idmap.put(a, i);\n- G[i] = new ArrayList();\n- S[i] = new PriorityQueue();\n- S[i].add(a);\n- }\n- for (int i = 0; i < N - 1; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- int c = in.nextInt();\n- G[a].add(new Edge(b, c));\n- G[b].add(new Edge(a, c));\n- }\n+public class Solution implements Runnable {\n \n- ans = new int[N];\n- long t2 = System.currentTimeMillis();\n- int left = N;\n- for (time = 0; ; time++) {\n- while (S[0].size() > 0) {\n- int p = S[0].poll();\n- ans[idmap.get(p)] = time;\n- left--;\n- }\n- if (left == 0) break;\n- Arrays.fill(V, false);\n- recur(0, -1, 0);\n- }\n- long t3 = System.currentTimeMillis();\n- StringBuilder an = new StringBuilder(\"\");\n- for (int a : ans) an.append(a + \" \");\n- System.out.println(an.toString().trim());\n- long t4 = System.currentTimeMillis();\n- System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n- }\n+ private StringTokenizer st;\n+ private BufferedReader in;\n+ private PrintWriter out;\n+ private ArrayList[] edges;\n+ private int[] p;\n+ private int[] c;\n \n- static void recur(int at, int prev, int cap) {\n- V[at] = true;\n- while (cap > 0 && S[at].size() > 0) {\n- int f = S[at].poll();\n- S[prev].add(f);\n- cap--;\n- }\n- for (int i = 0; i < G[at].size(); i++) {\n- Edge e = G[at].get(i);\n- if (V[e.to]) {\n- G[at].remove(i);\n- i--;\n- continue;\n- }\n- recur(e.to, at, e.cap);\n+ static class Edge {\n+ int u, v, c;\n+\n+ Edge(int u, int v, int c) {\n+ this.u = u;\n+ this.v = v;\n+ this.c = c;\n }\n }\n \n- static int[] ans;\n- static PriorityQueue[] S, NS;\n- static boolean[] V;\n- static int N, time;\n- static HashMap idmap;\n- static ArrayList[] G;\n+ public void solve() throws IOException {\n+ int n = nextInt();\n+ final int[] a = new int[n];\n+ edges = new ArrayList[n];\n+ for (int i = 0; i < n; ++i) {\n+ edges[i] = new ArrayList();\n+ a[i] = nextInt();\n+ }\n+ for (int i = 0; i < n - 1; ++i) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ int c = nextInt();\n+ edges[u].add(new Edge(u, v, c));\n+ edges[v].add(new Edge(v, u, c));\n+ }\n+ p = new int[n];\n+ c = new int[n];\n+ p[0] = -1;\n+ dfs(0, null);\n+ Integer[] ind = new Integer[n];\n+ int[] pos = new int[n];\n+ for (int i = 0; i < n; ++i) {\n+ ind[i] = pos[i] = i;\n+ }\n+ Arrays.sort(\n+ ind,\n+ new Comparator() {\n+ public int compare(Integer o1, Integer o2) {\n+ return a[o1] - a[o2];\n+ }\n+ });\n+ int[] ans = new int[n];\n+ while (true) {\n+ boolean ok = true;\n+ int[] cap = c.clone();\n+ for (int i : ind) {\n+ if (pos[i] != 0) {\n+ ans[i]++;\n+ if (cap[pos[i]] > 0) {\n+ cap[pos[i]]--;\n+ pos[i] = p[pos[i]];\n+ }\n+ ok = false;\n+ }\n+ }\n+ if (ok) {\n+ break;\n+ }\n+ }\n+ for (int i : ans) {\n+ out.print(i + \" \");\n+ }\n+ out.println();\n+ }\n \n- private static class Edge {\n- int to, cap;\n+ private void dfs(int i, Edge e) {\n+ if (e != null) {\n+ p[i] = e.u;\n+ c[i] = e.c;\n+ }\n+ for (Edge e1 : edges[i]) {\n+ if (e == null || e1.v != e.u) {\n+ dfs(e1.v, e1);\n+ }\n+ }\n+ }\n \n- public Edge(int to, int cap) {\n- this.to = to;\n- this.cap = cap;\n+ public void run() {\n+ try {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ eat(\"\");\n+\n+ solve();\n+\n+ out.close();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ failed = true;\n+ }\n+ }\n+\n+ void eat(String s) {\n+ st = new StringTokenizer(s);\n+ }\n+\n+ String next() throws IOException {\n+ while (!st.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ eat(line);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static boolean failed = false;\n+\n+ public static void main(String[] args) {\n+ Locale.setDefault(Locale.US);\n+ Thread th = new Thread(new Solution());\n+ th.start();\n+ try {\n+ th.join();\n+ } catch (InterruptedException iex) {\n+ }\n+ if (failed) {\n+ throw new RuntimeException();\n }\n }\n }", "output": "SLOWER 3.5109", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 11.3994, "pair_id": "java_10335_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n-import java.util.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.Queue;\n+import java.util.Scanner;\n \n-public class Solution implements Runnable {\n+public class GeneralMobilization {\n \n- private StringTokenizer st;\n- private BufferedReader in;\n- private PrintWriter out;\n- private ArrayList[] edges;\n- private int[] p;\n- private int[] c;\n+ public static void main(String[] args) {\n+ Scanner in = new Scanner(System.in);\n+ int n = in.nextInt();\n+ City[] city = new City[n];\n+ Devesion[] dev = new Devesion[n];\n \n- static class Edge {\n- int u, v, c;\n+ for (int i = 0; i < n; i++) {\n+ dev[i] = new Devesion(in.nextInt());\n+ city[i] = new City(dev[i]);\n+ }\n+ for (int i = 1; i < n; i++) {\n+ int x = in.nextInt() - 1, y = in.nextInt() - 1;\n+ if (city[y].capacity != 0) {\n+ int t = x;\n+ x = y;\n+ y = t;\n+ }\n+ city[x].children.add(city[y]);\n+ city[y].capacity = in.nextInt();\n+ }\n \n- Edge(int u, int v, int c) {\n- this.u = u;\n- this.v = v;\n- this.c = c;\n+ Queue queue = new LinkedList<>();\n+ while (city[0].devs.size() < n) {\n+ queue.add(city[0]);\n+ while (!queue.isEmpty()) {\n+ City node = queue.remove();\n+ for (int k = 0; k < node.children.size(); k++) {\n+ City c = node.children.get(k);\n+ queue.add(c);\n+ if (c.devs.isEmpty()) {\n+ node.children.remove(k--);\n+ continue;\n+ }\n+\n+ Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n+ for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n+ c.devs.get(j).time++;\n+ if (i < c.capacity) {\n+ node.devs.add(c.devs.get(0));\n+ c.devs.remove(0);\n+ j--;\n+ }\n+ }\n+ }\n+ }\n+ }\n+\n+ for (Devesion d : dev) {\n+ System.out.println(d.time);\n }\n }\n \n- public void solve() throws IOException {\n- int n = nextInt();\n- final int[] a = new int[n];\n- edges = new ArrayList[n];\n- for (int i = 0; i < n; ++i) {\n- edges[i] = new ArrayList();\n- a[i] = nextInt();\n- }\n- for (int i = 0; i < n - 1; ++i) {\n- int u = nextInt() - 1;\n- int v = nextInt() - 1;\n- int c = nextInt();\n- edges[u].add(new Edge(u, v, c));\n- edges[v].add(new Edge(v, u, c));\n- }\n- p = new int[n];\n- c = new int[n];\n- p[0] = -1;\n- dfs(0, null);\n- Integer[] ind = new Integer[n];\n- int[] pos = new int[n];\n- for (int i = 0; i < n; ++i) {\n- ind[i] = pos[i] = i;\n- }\n- Arrays.sort(\n- ind,\n- new Comparator() {\n- public int compare(Integer o1, Integer o2) {\n- return a[o1] - a[o2];\n- }\n- });\n- int[] ans = new int[n];\n- while (true) {\n- boolean ok = true;\n- int[] cap = c.clone();\n- for (int i : ind) {\n- if (pos[i] != 0) {\n- ans[i]++;\n- if (cap[pos[i]] > 0) {\n- cap[pos[i]]--;\n- pos[i] = p[pos[i]];\n- }\n- ok = false;\n- }\n- }\n- if (ok) {\n- break;\n- }\n- }\n- for (int i : ans) {\n- out.print(i + \" \");\n- }\n- out.println();\n- }\n+ static class Devesion {\n \n- private void dfs(int i, Edge e) {\n- if (e != null) {\n- p[i] = e.u;\n- c[i] = e.c;\n- }\n- for (Edge e1 : edges[i]) {\n- if (e == null || e1.v != e.u) {\n- dfs(e1.v, e1);\n- }\n+ int per, time;\n+\n+ public Devesion(int per) {\n+ this.per = per;\n }\n }\n \n- public void run() {\n- try {\n- in = new BufferedReader(new InputStreamReader(System.in));\n- out = new PrintWriter(System.out);\n- eat(\"\");\n+ static class City {\n \n- solve();\n+ int capacity;\n+ ArrayList children;\n+ ArrayList devs;\n \n- out.close();\n- } catch (Exception e) {\n- e.printStackTrace();\n- failed = true;\n- }\n- }\n-\n- void eat(String s) {\n- st = new StringTokenizer(s);\n- }\n-\n- String next() throws IOException {\n- while (!st.hasMoreTokens()) {\n- String line = in.readLine();\n- if (line == null) {\n- return null;\n- }\n- eat(line);\n- }\n- return st.nextToken();\n- }\n-\n- int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static boolean failed = false;\n-\n- public static void main(String[] args) {\n- Locale.setDefault(Locale.US);\n- Thread th = new Thread(new Solution());\n- th.start();\n- try {\n- th.join();\n- } catch (InterruptedException iex) {\n- }\n- if (failed) {\n- throw new RuntimeException();\n+ public City(Devesion i) {\n+ children = new ArrayList<>();\n+ devs = new ArrayList<>();\n+ devs.add(i);\n }\n }\n }", "output": "FASTER 3.3935", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 10.5086, "pair_id": "java_10338_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Solution implements Runnable {\n\n private StringTokenizer st;\n private BufferedReader in;\n private PrintWriter out;\n private ArrayList[] edges;\n private int[] p;\n private int[] c;\n\n static class Edge {\n int u, v, c;\n\n Edge(int u, int v, int c) {\n this.u = u;\n this.v = v;\n this.c = c;\n }\n }\n\n public void solve() throws IOException {\n int n = nextInt();\n final int[] a = new int[n];\n edges = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n edges[i] = new ArrayList();\n a[i] = nextInt();\n }\n for (int i = 0; i < n - 1; ++i) {\n int u = nextInt() - 1;\n int v = nextInt() - 1;\n int c = nextInt();\n edges[u].add(new Edge(u, v, c));\n edges[v].add(new Edge(v, u, c));\n }\n p = new int[n];\n c = new int[n];\n p[0] = -1;\n dfs(0, null);\n Integer[] ind = new Integer[n];\n int[] pos = new int[n];\n for (int i = 0; i < n; ++i) {\n ind[i] = pos[i] = i;\n }\n Arrays.sort(\n ind,\n new Comparator() {\n public int compare(Integer o1, Integer o2) {\n return a[o1] - a[o2];\n }\n });\n int[] ans = new int[n];\n while (true) {\n boolean ok = true;\n int[] cap = c.clone();\n for (int i : ind) {\n if (pos[i] != 0) {\n ans[i]++;\n if (cap[pos[i]] > 0) {\n cap[pos[i]]--;\n pos[i] = p[pos[i]];\n }\n ok = false;\n }\n }\n if (ok) {\n break;\n }\n }\n for (int i : ans) {\n out.print(i + \" \");\n }\n out.println();\n }\n\n private void dfs(int i, Edge e) {\n if (e != null) {\n p[i] = e.u;\n c[i] = e.c;\n }\n for (Edge e1 : edges[i]) {\n if (e == null || e1.v != e.u) {\n dfs(e1.v, e1);\n }\n }\n }\n\n public void run() {\n try {\n in = new BufferedReader(new InputStreamReader(System.in));\n out = new PrintWriter(System.out);\n eat(\"\");\n\n solve();\n\n out.close();\n } catch (Exception e) {\n e.printStackTrace();\n failed = true;\n }\n }\n\n void eat(String s) {\n st = new StringTokenizer(s);\n }\n\n String next() throws IOException {\n while (!st.hasMoreTokens()) {\n String line = in.readLine();\n if (line == null) {\n return null;\n }\n eat(line);\n }\n return st.nextToken();\n }\n\n int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static boolean failed = false;\n\n public static void main(String[] args) {\n Locale.setDefault(Locale.US);\n Thread th = new Thread(new Solution());\n th.start();\n try {\n th.join();\n } catch (InterruptedException iex) {\n }\n if (failed) {\n throw new RuntimeException();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.Queue;\n-import java.util.Scanner;\n+import java.io.*;\n+import java.util.*;\n \n-public class GeneralMobilization {\n+public class Solution implements Runnable {\n \n- public static void main(String[] args) {\n- Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- City[] city = new City[n];\n- Devesion[] dev = new Devesion[n];\n+ private StringTokenizer st;\n+ private BufferedReader in;\n+ private PrintWriter out;\n+ private ArrayList[] edges;\n+ private int[] p;\n+ private int[] c;\n \n- for (int i = 0; i < n; i++) {\n- dev[i] = new Devesion(in.nextInt());\n- city[i] = new City(dev[i]);\n- }\n- for (int i = 1; i < n; i++) {\n- int x = in.nextInt() - 1, y = in.nextInt() - 1;\n- if (city[y].capacity != 0) {\n- int t = x;\n- x = y;\n- y = t;\n- }\n- city[x].children.add(city[y]);\n- city[y].capacity = in.nextInt();\n- }\n+ static class Edge {\n+ int u, v, c;\n \n- Queue queue = new LinkedList<>();\n- while (city[0].devs.size() < n) {\n- queue.add(city[0]);\n- while (!queue.isEmpty()) {\n- City node = queue.remove();\n- for (int k = 0; k < node.children.size(); k++) {\n- City c = node.children.get(k);\n- queue.add(c);\n- if (c.devs.isEmpty()) {\n- node.children.remove(k--);\n- continue;\n- }\n-\n- Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n- for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n- c.devs.get(j).time++;\n- if (i < c.capacity) {\n- node.devs.add(c.devs.get(0));\n- c.devs.remove(0);\n- j--;\n- }\n- }\n- }\n- }\n- }\n-\n- for (Devesion d : dev) {\n- System.out.println(d.time);\n+ Edge(int u, int v, int c) {\n+ this.u = u;\n+ this.v = v;\n+ this.c = c;\n }\n }\n \n- static class Devesion {\n+ public void solve() throws IOException {\n+ int n = nextInt();\n+ final int[] a = new int[n];\n+ edges = new ArrayList[n];\n+ for (int i = 0; i < n; ++i) {\n+ edges[i] = new ArrayList();\n+ a[i] = nextInt();\n+ }\n+ for (int i = 0; i < n - 1; ++i) {\n+ int u = nextInt() - 1;\n+ int v = nextInt() - 1;\n+ int c = nextInt();\n+ edges[u].add(new Edge(u, v, c));\n+ edges[v].add(new Edge(v, u, c));\n+ }\n+ p = new int[n];\n+ c = new int[n];\n+ p[0] = -1;\n+ dfs(0, null);\n+ Integer[] ind = new Integer[n];\n+ int[] pos = new int[n];\n+ for (int i = 0; i < n; ++i) {\n+ ind[i] = pos[i] = i;\n+ }\n+ Arrays.sort(\n+ ind,\n+ new Comparator() {\n+ public int compare(Integer o1, Integer o2) {\n+ return a[o1] - a[o2];\n+ }\n+ });\n+ int[] ans = new int[n];\n+ while (true) {\n+ boolean ok = true;\n+ int[] cap = c.clone();\n+ for (int i : ind) {\n+ if (pos[i] != 0) {\n+ ans[i]++;\n+ if (cap[pos[i]] > 0) {\n+ cap[pos[i]]--;\n+ pos[i] = p[pos[i]];\n+ }\n+ ok = false;\n+ }\n+ }\n+ if (ok) {\n+ break;\n+ }\n+ }\n+ for (int i : ans) {\n+ out.print(i + \" \");\n+ }\n+ out.println();\n+ }\n \n- int per, time;\n-\n- public Devesion(int per) {\n- this.per = per;\n+ private void dfs(int i, Edge e) {\n+ if (e != null) {\n+ p[i] = e.u;\n+ c[i] = e.c;\n+ }\n+ for (Edge e1 : edges[i]) {\n+ if (e == null || e1.v != e.u) {\n+ dfs(e1.v, e1);\n+ }\n }\n }\n \n- static class City {\n+ public void run() {\n+ try {\n+ in = new BufferedReader(new InputStreamReader(System.in));\n+ out = new PrintWriter(System.out);\n+ eat(\"\");\n \n- int capacity;\n- ArrayList children;\n- ArrayList devs;\n+ solve();\n \n- public City(Devesion i) {\n- children = new ArrayList<>();\n- devs = new ArrayList<>();\n- devs.add(i);\n+ out.close();\n+ } catch (Exception e) {\n+ e.printStackTrace();\n+ failed = true;\n+ }\n+ }\n+\n+ void eat(String s) {\n+ st = new StringTokenizer(s);\n+ }\n+\n+ String next() throws IOException {\n+ while (!st.hasMoreTokens()) {\n+ String line = in.readLine();\n+ if (line == null) {\n+ return null;\n+ }\n+ eat(line);\n+ }\n+ return st.nextToken();\n+ }\n+\n+ int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+\n+ double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static boolean failed = false;\n+\n+ public static void main(String[] args) {\n+ Locale.setDefault(Locale.US);\n+ Thread th = new Thread(new Solution());\n+ th.start();\n+ try {\n+ th.join();\n+ } catch (InterruptedException iex) {\n+ }\n+ if (failed) {\n+ throw new RuntimeException();\n }\n }\n }", "output": "SLOWER 3.3935", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 10.5086, "pair_id": "java_10338_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.ArrayList;\n-import java.util.Collections;\n-import java.util.LinkedList;\n-import java.util.Queue;\n-import java.util.Scanner;\n+import static java.lang.Math.*;\n \n-public class GeneralMobilization {\n+import java.util.*;\n \n+public class C {\n public static void main(String[] args) {\n+ long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n- int n = in.nextInt();\n- City[] city = new City[n];\n- Devesion[] dev = new Devesion[n];\n-\n- for (int i = 0; i < n; i++) {\n- dev[i] = new Devesion(in.nextInt());\n- city[i] = new City(dev[i]);\n+ N = in.nextInt();\n+ idmap = new HashMap();\n+ V = new boolean[N];\n+ S = new PriorityQueue[N];\n+ G = new ArrayList[N];\n+ for (int i = 0; i < N; i++) {\n+ int a = in.nextInt();\n+ idmap.put(a, i);\n+ G[i] = new ArrayList();\n+ S[i] = new PriorityQueue();\n+ S[i].add(a);\n }\n- for (int i = 1; i < n; i++) {\n- int x = in.nextInt() - 1, y = in.nextInt() - 1;\n- if (city[y].capacity != 0) {\n- int t = x;\n- x = y;\n- y = t;\n- }\n- city[x].children.add(city[y]);\n- city[y].capacity = in.nextInt();\n+ for (int i = 0; i < N - 1; i++) {\n+ int a = in.nextInt() - 1;\n+ int b = in.nextInt() - 1;\n+ int c = in.nextInt();\n+ G[a].add(new Edge(b, c));\n+ G[b].add(new Edge(a, c));\n }\n \n- Queue queue = new LinkedList<>();\n- while (city[0].devs.size() < n) {\n- queue.add(city[0]);\n- while (!queue.isEmpty()) {\n- City node = queue.remove();\n- for (int k = 0; k < node.children.size(); k++) {\n- City c = node.children.get(k);\n- queue.add(c);\n- if (c.devs.isEmpty()) {\n- node.children.remove(k--);\n- continue;\n- }\n+ ans = new int[N];\n+ long t2 = System.currentTimeMillis();\n+ int left = N;\n+ for (time = 0; ; time++) {\n+ while (S[0].size() > 0) {\n+ int p = S[0].poll();\n+ ans[idmap.get(p)] = time;\n+ left--;\n+ }\n+ if (left == 0) break;\n+ Arrays.fill(V, false);\n+ recur(0, -1, 0);\n+ }\n+ long t3 = System.currentTimeMillis();\n+ StringBuilder an = new StringBuilder(\"\");\n+ for (int a : ans) an.append(a + \" \");\n+ System.out.println(an.toString().trim());\n+ long t4 = System.currentTimeMillis();\n+ System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n+ }\n \n- Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n- for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n- c.devs.get(j).time++;\n- if (i < c.capacity) {\n- node.devs.add(c.devs.get(0));\n- c.devs.remove(0);\n- j--;\n- }\n- }\n- }\n+ static void recur(int at, int prev, int cap) {\n+ V[at] = true;\n+ while (cap > 0 && S[at].size() > 0) {\n+ int f = S[at].poll();\n+ S[prev].add(f);\n+ cap--;\n+ }\n+ for (int i = 0; i < G[at].size(); i++) {\n+ Edge e = G[at].get(i);\n+ if (V[e.to]) {\n+ G[at].remove(i);\n+ i--;\n+ continue;\n }\n- }\n-\n- for (Devesion d : dev) {\n- System.out.println(d.time);\n+ recur(e.to, at, e.cap);\n }\n }\n \n- static class Devesion {\n+ static int[] ans;\n+ static PriorityQueue[] S, NS;\n+ static boolean[] V;\n+ static int N, time;\n+ static HashMap idmap;\n+ static ArrayList[] G;\n \n- int per, time;\n+ private static class Edge {\n+ int to, cap;\n \n- public Devesion(int per) {\n- this.per = per;\n- }\n- }\n-\n- static class City {\n-\n- int capacity;\n- ArrayList children;\n- ArrayList devs;\n-\n- public City(Devesion i) {\n- children = new ArrayList<>();\n- devs = new ArrayList<>();\n- devs.add(i);\n+ public Edge(int to, int cap) {\n+ this.to = to;\n+ this.cap = cap;\n }\n }\n }", "output": "FASTER 0.1174", "problem_id": "82_C", "direction": "forward", "speedup_ratio": 1.0848, "pair_id": "java_10334_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.util.*;\n\npublic class C {\n public static void main(String[] args) {\n long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n N = in.nextInt();\n idmap = new HashMap();\n V = new boolean[N];\n S = new PriorityQueue[N];\n G = new ArrayList[N];\n for (int i = 0; i < N; i++) {\n int a = in.nextInt();\n idmap.put(a, i);\n G[i] = new ArrayList();\n S[i] = new PriorityQueue();\n S[i].add(a);\n }\n for (int i = 0; i < N - 1; i++) {\n int a = in.nextInt() - 1;\n int b = in.nextInt() - 1;\n int c = in.nextInt();\n G[a].add(new Edge(b, c));\n G[b].add(new Edge(a, c));\n }\n\n ans = new int[N];\n long t2 = System.currentTimeMillis();\n int left = N;\n for (time = 0; ; time++) {\n while (S[0].size() > 0) {\n int p = S[0].poll();\n ans[idmap.get(p)] = time;\n left--;\n }\n if (left == 0) break;\n Arrays.fill(V, false);\n recur(0, -1, 0);\n }\n long t3 = System.currentTimeMillis();\n StringBuilder an = new StringBuilder(\"\");\n for (int a : ans) an.append(a + \" \");\n System.out.println(an.toString().trim());\n long t4 = System.currentTimeMillis();\n System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n }\n\n static void recur(int at, int prev, int cap) {\n V[at] = true;\n while (cap > 0 && S[at].size() > 0) {\n int f = S[at].poll();\n S[prev].add(f);\n cap--;\n }\n for (int i = 0; i < G[at].size(); i++) {\n Edge e = G[at].get(i);\n if (V[e.to]) {\n G[at].remove(i);\n i--;\n continue;\n }\n recur(e.to, at, e.cap);\n }\n }\n\n static int[] ans;\n static PriorityQueue[] S, NS;\n static boolean[] V;\n static int N, time;\n static HashMap idmap;\n static ArrayList[] G;\n\n private static class Edge {\n int to, cap;\n\n public Edge(int to, int cap) {\n this.to = to;\n this.cap = cap;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.LinkedList;\nimport java.util.Queue;\nimport java.util.Scanner;\n\npublic class GeneralMobilization {\n\n public static void main(String[] args) {\n Scanner in = new Scanner(System.in);\n int n = in.nextInt();\n City[] city = new City[n];\n Devesion[] dev = new Devesion[n];\n\n for (int i = 0; i < n; i++) {\n dev[i] = new Devesion(in.nextInt());\n city[i] = new City(dev[i]);\n }\n for (int i = 1; i < n; i++) {\n int x = in.nextInt() - 1, y = in.nextInt() - 1;\n if (city[y].capacity != 0) {\n int t = x;\n x = y;\n y = t;\n }\n city[x].children.add(city[y]);\n city[y].capacity = in.nextInt();\n }\n\n Queue queue = new LinkedList<>();\n while (city[0].devs.size() < n) {\n queue.add(city[0]);\n while (!queue.isEmpty()) {\n City node = queue.remove();\n for (int k = 0; k < node.children.size(); k++) {\n City c = node.children.get(k);\n queue.add(c);\n if (c.devs.isEmpty()) {\n node.children.remove(k--);\n continue;\n }\n\n Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n c.devs.get(j).time++;\n if (i < c.capacity) {\n node.devs.add(c.devs.get(0));\n c.devs.remove(0);\n j--;\n }\n }\n }\n }\n }\n\n for (Devesion d : dev) {\n System.out.println(d.time);\n }\n }\n\n static class Devesion {\n\n int per, time;\n\n public Devesion(int per) {\n this.per = per;\n }\n }\n\n static class City {\n\n int capacity;\n ArrayList children;\n ArrayList devs;\n\n public City(Devesion i) {\n children = new ArrayList<>();\n devs = new ArrayList<>();\n devs.add(i);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.lang.Math.*;\n+import java.util.ArrayList;\n+import java.util.Collections;\n+import java.util.LinkedList;\n+import java.util.Queue;\n+import java.util.Scanner;\n \n-import java.util.*;\n+public class GeneralMobilization {\n \n-public class C {\n public static void main(String[] args) {\n- long t1 = System.currentTimeMillis();\n Scanner in = new Scanner(System.in);\n- N = in.nextInt();\n- idmap = new HashMap();\n- V = new boolean[N];\n- S = new PriorityQueue[N];\n- G = new ArrayList[N];\n- for (int i = 0; i < N; i++) {\n- int a = in.nextInt();\n- idmap.put(a, i);\n- G[i] = new ArrayList();\n- S[i] = new PriorityQueue();\n- S[i].add(a);\n+ int n = in.nextInt();\n+ City[] city = new City[n];\n+ Devesion[] dev = new Devesion[n];\n+\n+ for (int i = 0; i < n; i++) {\n+ dev[i] = new Devesion(in.nextInt());\n+ city[i] = new City(dev[i]);\n }\n- for (int i = 0; i < N - 1; i++) {\n- int a = in.nextInt() - 1;\n- int b = in.nextInt() - 1;\n- int c = in.nextInt();\n- G[a].add(new Edge(b, c));\n- G[b].add(new Edge(a, c));\n+ for (int i = 1; i < n; i++) {\n+ int x = in.nextInt() - 1, y = in.nextInt() - 1;\n+ if (city[y].capacity != 0) {\n+ int t = x;\n+ x = y;\n+ y = t;\n+ }\n+ city[x].children.add(city[y]);\n+ city[y].capacity = in.nextInt();\n }\n \n- ans = new int[N];\n- long t2 = System.currentTimeMillis();\n- int left = N;\n- for (time = 0; ; time++) {\n- while (S[0].size() > 0) {\n- int p = S[0].poll();\n- ans[idmap.get(p)] = time;\n- left--;\n+ Queue queue = new LinkedList<>();\n+ while (city[0].devs.size() < n) {\n+ queue.add(city[0]);\n+ while (!queue.isEmpty()) {\n+ City node = queue.remove();\n+ for (int k = 0; k < node.children.size(); k++) {\n+ City c = node.children.get(k);\n+ queue.add(c);\n+ if (c.devs.isEmpty()) {\n+ node.children.remove(k--);\n+ continue;\n+ }\n+\n+ Collections.sort(c.devs, (a, b) -> a.per < b.per ? -1 : 1);\n+ for (int i = 0, j = 0; j < c.devs.size(); i++, j++) {\n+ c.devs.get(j).time++;\n+ if (i < c.capacity) {\n+ node.devs.add(c.devs.get(0));\n+ c.devs.remove(0);\n+ j--;\n+ }\n+ }\n+ }\n }\n- if (left == 0) break;\n- Arrays.fill(V, false);\n- recur(0, -1, 0);\n }\n- long t3 = System.currentTimeMillis();\n- StringBuilder an = new StringBuilder(\"\");\n- for (int a : ans) an.append(a + \" \");\n- System.out.println(an.toString().trim());\n- long t4 = System.currentTimeMillis();\n- System.err.println((t2 - t1) + \" \" + (t3 - t2) + \" \" + (t4 - t3));\n- }\n \n- static void recur(int at, int prev, int cap) {\n- V[at] = true;\n- while (cap > 0 && S[at].size() > 0) {\n- int f = S[at].poll();\n- S[prev].add(f);\n- cap--;\n- }\n- for (int i = 0; i < G[at].size(); i++) {\n- Edge e = G[at].get(i);\n- if (V[e.to]) {\n- G[at].remove(i);\n- i--;\n- continue;\n- }\n- recur(e.to, at, e.cap);\n+ for (Devesion d : dev) {\n+ System.out.println(d.time);\n }\n }\n \n- static int[] ans;\n- static PriorityQueue[] S, NS;\n- static boolean[] V;\n- static int N, time;\n- static HashMap idmap;\n- static ArrayList[] G;\n+ static class Devesion {\n \n- private static class Edge {\n- int to, cap;\n+ int per, time;\n \n- public Edge(int to, int cap) {\n- this.to = to;\n- this.cap = cap;\n+ public Devesion(int per) {\n+ this.per = per;\n+ }\n+ }\n+\n+ static class City {\n+\n+ int capacity;\n+ ArrayList children;\n+ ArrayList devs;\n+\n+ public City(Devesion i) {\n+ children = new ArrayList<>();\n+ devs = new ArrayList<>();\n+ devs.add(i);\n }\n }\n }", "output": "SLOWER 0.1174", "problem_id": "82_C", "direction": "reversed", "speedup_ratio": 1.0848, "pair_id": "java_10334_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- solve3027();\n- }\n \n- public static void solve3027() {\n- Scanner sc = new Scanner(System.in);\n+ public static void main(String[] args) throws IOException {\n \n- int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n- System.out.println(ans);\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n \n- sc.close();\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n+ }\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7404", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 106.9183, "pair_id": "java_7304_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ solve3027();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ public static void solve3027() {\n+ Scanner sc = new Scanner(System.in);\n \n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int N = sc.nextInt();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n \n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ System.out.println(ans);\n \n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n- }\n-\n- System.out.println(i - 1);\n+ sc.close();\n }\n }", "output": "SLOWER 6.7404", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 106.9183, "pair_id": "java_7304_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n+ solve3027();\n+ }\n+\n+ public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n- }\n- System.out.println(Math.max(count1, count2));\n+\n+ int N = sc.nextInt();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n+\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ System.out.println(ans);\n+\n+ sc.close();\n }\n }", "output": "FASTER 0.0144", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 1.01, "pair_id": "java_7307_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- solve3027();\n- }\n-\n- public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n-\n- int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n-\n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n- System.out.println(ans);\n-\n- sc.close();\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n+ }\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "SLOWER 0.0144", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 1.01, "pair_id": "java_7307_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.util.*;\n \n public class Main {\n public static void main(String[] args) {\n- solve3027();\n- }\n-\n- public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n-\n- int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n-\n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n- System.out.println(ans);\n-\n- sc.close();\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n+ }\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "FASTER 0.0007", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 1.0005, "pair_id": "java_7309_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n+ solve3027();\n+ }\n+\n+ public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n- }\n- System.out.println(Math.max(count1, count2));\n+\n+ int N = sc.nextInt();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n+\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ System.out.println(ans);\n+\n+ sc.close();\n }\n }", "output": "SLOWER 0.0007", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 1.0005, "pair_id": "java_7309_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- solve3027();\n- }\n \n- public static void solve3027() {\n- Scanner sc = new Scanner(System.in);\n+ public static void main(String[] args) throws IOException {\n \n- int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n \n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n- System.out.println(ans);\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n \n- sc.close();\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n+ }\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7554", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 108.0399, "pair_id": "java_7306_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.Scanner;\n \n public class Main {\n+ public static void main(String[] args) {\n+ solve3027();\n+ }\n \n- public static void main(String[] args) throws IOException {\n+ public static void solve3027() {\n+ Scanner sc = new Scanner(System.in);\n \n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+ int N = sc.nextInt();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n \n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ System.out.println(ans);\n \n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n- }\n-\n- System.out.println(i - 1);\n+ sc.close();\n }\n }", "output": "SLOWER 6.7554", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 108.0399, "pair_id": "java_7306_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.*;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStreamReader;\n \n public class Main {\n- public static void main(String[] args) {\n- Scanner sc = new Scanner(System.in);\n- int n = sc.nextInt();\n- int count1 = -1;\n- int count2 = 0;\n- while (n > 0) {\n- count2 += n % 2;\n- n >>= 1;\n- count1++;\n+\n+ public static void main(String[] args) throws IOException {\n+\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+\n+ String str = br.readLine();\n+ int num = Integer.parseInt(str);\n+\n+ int i;\n+\n+ for (i = 0; i < 100; i++) {\n+ if (num >= Math.pow(2, i) - 1) {\n+ continue;\n+ } else {\n+ break;\n+ }\n }\n- System.out.println(Math.max(count1, count2));\n+\n+ System.out.println(i - 1);\n }\n }", "output": "FASTER 6.7548", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 107.9911, "pair_id": "java_7305_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\n\npublic class Main {\n\n public static void main(String[] args) throws IOException {\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n String str = br.readLine();\n int num = Integer.parseInt(str);\n\n int i;\n\n for (i = 0; i < 100; i++) {\n if (num >= Math.pow(2, i) - 1) {\n continue;\n } else {\n break;\n }\n }\n\n System.out.println(i - 1);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int n = sc.nextInt();\n int count1 = -1;\n int count2 = 0;\n while (n > 0) {\n count2 += n % 2;\n n >>= 1;\n count1++;\n }\n System.out.println(Math.max(count1, count2));\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStreamReader;\n+import java.util.*;\n \n public class Main {\n-\n- public static void main(String[] args) throws IOException {\n-\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n-\n- String str = br.readLine();\n- int num = Integer.parseInt(str);\n-\n- int i;\n-\n- for (i = 0; i < 100; i++) {\n- if (num >= Math.pow(2, i) - 1) {\n- continue;\n- } else {\n- break;\n- }\n+ public static void main(String[] args) {\n+ Scanner sc = new Scanner(System.in);\n+ int n = sc.nextInt();\n+ int count1 = -1;\n+ int count2 = 0;\n+ while (n > 0) {\n+ count2 += n % 2;\n+ n >>= 1;\n+ count1++;\n }\n-\n- System.out.println(i - 1);\n+ System.out.println(Math.max(count1, count2));\n }\n }", "output": "SLOWER 6.7548", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 107.9911, "pair_id": "java_7305_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n solve3027();\n }\n \n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n \n int N = sc.nextInt();\n- int binaryNumDigits = Integer.toBinaryString(N).length();\n+ String binary = Integer.toBinaryString(N);\n+ int binaryNumDigits = binary.length();\n \n- int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n+ int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n \n sc.close();\n }\n }", "output": "FASTER 0.0151", "problem_id": "p02125", "direction": "forward", "speedup_ratio": 1.0105, "pair_id": "java_7308_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n String binary = Integer.toBinaryString(N);\n int binaryNumDigits = binary.length();\n\n int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n solve3027();\n }\n\n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n\n int N = sc.nextInt();\n int binaryNumDigits = Integer.toBinaryString(N).length();\n\n int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n\n sc.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.util.Scanner;\n \n public class Main {\n public static void main(String[] args) {\n solve3027();\n }\n \n public static void solve3027() {\n Scanner sc = new Scanner(System.in);\n \n int N = sc.nextInt();\n- String binary = Integer.toBinaryString(N);\n- int binaryNumDigits = binary.length();\n+ int binaryNumDigits = Integer.toBinaryString(N).length();\n \n- int ans = binary.contains(\"0\") ? binaryNumDigits - 1 : binaryNumDigits;\n+ int ans = N == Math.pow(2, binaryNumDigits) - 1 ? binaryNumDigits : binaryNumDigits - 1;\n System.out.println(ans);\n \n sc.close();\n }\n }", "output": "SLOWER 0.0151", "problem_id": "p02125", "direction": "reversed", "speedup_ratio": 1.0105, "pair_id": "java_7308_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collections;\nimport java.util.Scanner;\nimport java.util.StringTokenizer;\n\npublic class Test {\n static long mod = 1000000007;\n static int[][][] dp;\n\n static int contains;\n\n public static void main(String[] args) throws FileNotFoundException {\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int a = 0;\n int b = 0;\n ArrayList list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int l = in.nextInt();\n int[] data = new int[l];\n for (int j = 0; j < l; j++) {\n data[j] = in.nextInt();\n }\n if (l % 2 == 1) {\n list.add(data[l / 2]);\n }\n for (int j = 0; j < l / 2; j++) {\n a += data[j];\n b += data[j + (l / 2) + (l % 2)];\n }\n }\n Collections.sort(list, Collections.reverseOrder());\n for (int i = 0; i < list.size(); i++) {\n if (i % 2 == 0) {\n a += list.get(i);\n } else {\n b += list.get(i);\n }\n }\n out.println(a + \" \" + b);\n out.close();\n }\n\n public static int cal(int index, int greater, int smaller, long a, long b) {\n if (index < 0) {\n return 0;\n }\n if (greater == 1 && smaller == 1) {\n return dp[index][greater][smaller] = 1 + index;\n }\n if (dp[index][greater][smaller] != -1) {\n return dp[index][greater][smaller];\n }\n int result = 0;\n int x = ((1L << index) & a) != 0 ? 1 : 0;\n int y = ((1L << index) & b) != 0 ? 1 : 0;\n\n for (int i = 0; i < 2; i++) {\n if ((smaller == 1 || y >= i) && (greater == 1 || x <= i)) {\n result =\n Math.max(result, i + cal(index - 1, x < i ? 1 : greater, y > i ? 1 : smaller, a, b));\n }\n }\n return dp[index][greater][smaller] = result;\n }\n\n static int cal(int index, int m, int[] pos) {\n int result = 1;\n\n for (int i = 0; i < pos.length; i++) {\n if (pos[i] == index) {\n result += cal(i, m, pos);\n }\n }\n if (index == m) {\n contains = 1;\n } else if (contains != -1) {\n contains++;\n }\n\n return result;\n }\n\n static int crossProduct(Point a, Point b) {\n return a.x * b.y + a.y * b.x;\n }\n\n static long squareDist(Point a) {\n long x = a.x;\n long y = a.y;\n return x * x + y * y;\n }\n\n static Point minus(Point a, Point b) {\n return new Point(a.x - b.x, a.y - b.y);\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n super();\n this.x = x;\n this.y = y;\n }\n\n public String toString() {\n return \"{\" + x + \" \" + y + \"}\";\n }\n }\n\n static class Entry implements Comparable {\n int x, cost;\n\n public Entry(int x, int cost) {\n super();\n this.x = x;\n this.cost = cost;\n }\n\n public int compareTo(Entry o) {\n\n if (cost > o.cost) {\n return 1;\n } else if (cost == o.cost) {\n return -1;\n }\n\n return 0;\n }\n }\n\n static int gcd(int a, int b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.Comparator;\nimport java.util.StringTokenizer;\n\npublic class Abood2B {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n int n = sc.nextInt();\n\n int a = 0;\n int b = 0;\n\n ArrayList h = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n int c = sc.nextInt();\n\n for (int j = 0; j < c / 2; j++) {\n a += sc.nextInt();\n }\n\n if (c % 2 == 1) h.add(sc.nextInt());\n\n for (int j = (c + 1) / 2; j < c; j++) {\n b += sc.nextInt();\n }\n }\n\n Collections.sort(\n h,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return o2 - o1;\n }\n });\n\n for (int i = 0; i < h.size(); i++) {\n if (i % 2 == 0) a += h.get(i);\n else b += h.get(i);\n }\n\n System.out.println(a + \" \" + b);\n\n out.flush();\n out.close();\n }\n\n static class Scanner {\n\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.FileNotFoundException;\n+import java.io.IOException;\n+import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n-import java.util.Arrays;\n import java.util.Collections;\n-import java.util.Scanner;\n+import java.util.Comparator;\n import java.util.StringTokenizer;\n \n-public class Test {\n- static long mod = 1000000007;\n- static int[][][] dp;\n+public class Abood2B {\n \n- static int contains;\n+ public static void main(String[] args) throws IOException {\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n \n- public static void main(String[] args) throws FileNotFoundException {\n- PrintWriter out = new PrintWriter(System.out);\n- Scanner in = new Scanner();\n- int n = in.nextInt();\n+ int n = sc.nextInt();\n+\n int a = 0;\n int b = 0;\n- ArrayList list = new ArrayList();\n+\n+ ArrayList h = new ArrayList<>();\n+\n for (int i = 0; i < n; i++) {\n- int l = in.nextInt();\n- int[] data = new int[l];\n- for (int j = 0; j < l; j++) {\n- data[j] = in.nextInt();\n+ int c = sc.nextInt();\n+\n+ for (int j = 0; j < c / 2; j++) {\n+ a += sc.nextInt();\n }\n- if (l % 2 == 1) {\n- list.add(data[l / 2]);\n- }\n- for (int j = 0; j < l / 2; j++) {\n- a += data[j];\n- b += data[j + (l / 2) + (l % 2)];\n+\n+ if (c % 2 == 1) h.add(sc.nextInt());\n+\n+ for (int j = (c + 1) / 2; j < c; j++) {\n+ b += sc.nextInt();\n }\n }\n- Collections.sort(list, Collections.reverseOrder());\n- for (int i = 0; i < list.size(); i++) {\n- if (i % 2 == 0) {\n- a += list.get(i);\n- } else {\n- b += list.get(i);\n- }\n- }\n- out.println(a + \" \" + b);\n- out.close();\n- }\n \n- public static int cal(int index, int greater, int smaller, long a, long b) {\n- if (index < 0) {\n- return 0;\n- }\n- if (greater == 1 && smaller == 1) {\n- return dp[index][greater][smaller] = 1 + index;\n- }\n- if (dp[index][greater][smaller] != -1) {\n- return dp[index][greater][smaller];\n- }\n- int result = 0;\n- int x = ((1L << index) & a) != 0 ? 1 : 0;\n- int y = ((1L << index) & b) != 0 ? 1 : 0;\n+ Collections.sort(\n+ h,\n+ new Comparator() {\n \n- for (int i = 0; i < 2; i++) {\n- if ((smaller == 1 || y >= i) && (greater == 1 || x <= i)) {\n- result =\n- Math.max(result, i + cal(index - 1, x < i ? 1 : greater, y > i ? 1 : smaller, a, b));\n- }\n- }\n- return dp[index][greater][smaller] = result;\n- }\n+ @Override\n+ public int compare(Integer o1, Integer o2) {\n+ return o2 - o1;\n+ }\n+ });\n \n- static int cal(int index, int m, int[] pos) {\n- int result = 1;\n-\n- for (int i = 0; i < pos.length; i++) {\n- if (pos[i] == index) {\n- result += cal(i, m, pos);\n- }\n- }\n- if (index == m) {\n- contains = 1;\n- } else if (contains != -1) {\n- contains++;\n+ for (int i = 0; i < h.size(); i++) {\n+ if (i % 2 == 0) a += h.get(i);\n+ else b += h.get(i);\n }\n \n- return result;\n- }\n+ System.out.println(a + \" \" + b);\n \n- static int crossProduct(Point a, Point b) {\n- return a.x * b.y + a.y * b.x;\n- }\n-\n- static long squareDist(Point a) {\n- long x = a.x;\n- long y = a.y;\n- return x * x + y * y;\n- }\n-\n- static Point minus(Point a, Point b) {\n- return new Point(a.x - b.x, a.y - b.y);\n- }\n-\n- public static boolean nextPer(int[] data) {\n- int i = data.length - 1;\n- while (i > 0 && data[i] < data[i - 1]) {\n- i--;\n- }\n- if (i == 0) {\n- return false;\n- }\n- int j = data.length - 1;\n- while (data[j] < data[i - 1]) {\n- j--;\n- }\n- int temp = data[i - 1];\n- data[i - 1] = data[j];\n- data[j] = temp;\n- Arrays.sort(data, i, data.length);\n- return true;\n- }\n-\n- static class Point {\n- int x, y;\n-\n- public Point(int x, int y) {\n- super();\n- this.x = x;\n- this.y = y;\n- }\n-\n- public String toString() {\n- return \"{\" + x + \" \" + y + \"}\";\n- }\n- }\n-\n- static class Entry implements Comparable {\n- int x, cost;\n-\n- public Entry(int x, int cost) {\n- super();\n- this.x = x;\n- this.cost = cost;\n- }\n-\n- public int compareTo(Entry o) {\n-\n- if (cost > o.cost) {\n- return 1;\n- } else if (cost == o.cost) {\n- return -1;\n- }\n-\n- return 0;\n- }\n- }\n-\n- static int gcd(int a, int b) {\n- if (b == 0) {\n- return a;\n- }\n- return gcd(b, a % b);\n+ out.flush();\n+ out.close();\n }\n \n static class Scanner {\n \n+ StringTokenizer st;\n BufferedReader br;\n- StringTokenizer st;\n \n- public Scanner() throws FileNotFoundException {\n-\n- br = new BufferedReader(new InputStreamReader(System.in));\n+ public Scanner(InputStream s) {\n+ br = new BufferedReader(new InputStreamReader(s));\n }\n \n- public String next() {\n-\n- while (st == null || !st.hasMoreTokens()) {\n- try {\n- st = new StringTokenizer(br.readLine());\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n+ public String next() throws IOException {\n+ while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n \n- public long nextLong() {\n+ public int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n \n- public int nextInt() {\n- return Integer.parseInt(next());\n+ public String nextLine() throws IOException {\n+ return br.readLine();\n }\n \n- public double nextDouble() {\n- return Double.parseDouble(next());\n+ public double nextDouble() throws IOException {\n+ String x = next();\n+ StringBuilder sb = new StringBuilder(\"0\");\n+ double res = 0, f = 1;\n+ boolean dec = false, neg = false;\n+ int start = 0;\n+ if (x.charAt(0) == '-') {\n+ neg = true;\n+ start++;\n+ }\n+ for (int i = start; i < x.length(); i++)\n+ if (x.charAt(i) == '.') {\n+ res = Long.parseLong(sb.toString());\n+ sb = new StringBuilder(\"0\");\n+ dec = true;\n+ } else {\n+ sb.append(x.charAt(i));\n+ if (dec) f *= 10;\n+ }\n+ res += Long.parseLong(sb.toString()) / f;\n+ return res * (neg ? -1 : 1);\n }\n \n- public String nextLine() {\n- st = null;\n- try {\n- return br.readLine();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n- }\n-\n- public boolean endLine() {\n- try {\n- String next = br.readLine();\n- while (next != null && next.trim().isEmpty()) {\n- next = br.readLine();\n- }\n- if (next == null) {\n- return true;\n- }\n- st = new StringTokenizer(next);\n- return st.hasMoreTokens();\n- } catch (Exception e) {\n- throw new RuntimeException();\n- }\n+ public boolean ready() throws IOException {\n+ return br.ready();\n }\n }\n }", "output": "FASTER 0.0808", "problem_id": "388_C", "direction": "forward", "speedup_ratio": 1.0576, "pair_id": "java_9454_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.Comparator;\nimport java.util.StringTokenizer;\n\npublic class Abood2B {\n\n public static void main(String[] args) throws IOException {\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n int n = sc.nextInt();\n\n int a = 0;\n int b = 0;\n\n ArrayList h = new ArrayList<>();\n\n for (int i = 0; i < n; i++) {\n int c = sc.nextInt();\n\n for (int j = 0; j < c / 2; j++) {\n a += sc.nextInt();\n }\n\n if (c % 2 == 1) h.add(sc.nextInt());\n\n for (int j = (c + 1) / 2; j < c; j++) {\n b += sc.nextInt();\n }\n }\n\n Collections.sort(\n h,\n new Comparator() {\n\n @Override\n public int compare(Integer o1, Integer o2) {\n return o2 - o1;\n }\n });\n\n for (int i = 0; i < h.size(); i++) {\n if (i % 2 == 0) a += h.get(i);\n else b += h.get(i);\n }\n\n System.out.println(a + \" \" + b);\n\n out.flush();\n out.close();\n }\n\n static class Scanner {\n\n StringTokenizer st;\n BufferedReader br;\n\n public Scanner(InputStream s) {\n br = new BufferedReader(new InputStreamReader(s));\n }\n\n public String next() throws IOException {\n while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n return st.nextToken();\n }\n\n public int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n public long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n\n public String nextLine() throws IOException {\n return br.readLine();\n }\n\n public double nextDouble() throws IOException {\n String x = next();\n StringBuilder sb = new StringBuilder(\"0\");\n double res = 0, f = 1;\n boolean dec = false, neg = false;\n int start = 0;\n if (x.charAt(0) == '-') {\n neg = true;\n start++;\n }\n for (int i = start; i < x.length(); i++)\n if (x.charAt(i) == '.') {\n res = Long.parseLong(sb.toString());\n sb = new StringBuilder(\"0\");\n dec = true;\n } else {\n sb.append(x.charAt(i));\n if (dec) f *= 10;\n }\n res += Long.parseLong(sb.toString()) / f;\n return res * (neg ? -1 : 1);\n }\n\n public boolean ready() throws IOException {\n return br.ready();\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.FileNotFoundException;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.Collections;\nimport java.util.Scanner;\nimport java.util.StringTokenizer;\n\npublic class Test {\n static long mod = 1000000007;\n static int[][][] dp;\n\n static int contains;\n\n public static void main(String[] args) throws FileNotFoundException {\n PrintWriter out = new PrintWriter(System.out);\n Scanner in = new Scanner();\n int n = in.nextInt();\n int a = 0;\n int b = 0;\n ArrayList list = new ArrayList();\n for (int i = 0; i < n; i++) {\n int l = in.nextInt();\n int[] data = new int[l];\n for (int j = 0; j < l; j++) {\n data[j] = in.nextInt();\n }\n if (l % 2 == 1) {\n list.add(data[l / 2]);\n }\n for (int j = 0; j < l / 2; j++) {\n a += data[j];\n b += data[j + (l / 2) + (l % 2)];\n }\n }\n Collections.sort(list, Collections.reverseOrder());\n for (int i = 0; i < list.size(); i++) {\n if (i % 2 == 0) {\n a += list.get(i);\n } else {\n b += list.get(i);\n }\n }\n out.println(a + \" \" + b);\n out.close();\n }\n\n public static int cal(int index, int greater, int smaller, long a, long b) {\n if (index < 0) {\n return 0;\n }\n if (greater == 1 && smaller == 1) {\n return dp[index][greater][smaller] = 1 + index;\n }\n if (dp[index][greater][smaller] != -1) {\n return dp[index][greater][smaller];\n }\n int result = 0;\n int x = ((1L << index) & a) != 0 ? 1 : 0;\n int y = ((1L << index) & b) != 0 ? 1 : 0;\n\n for (int i = 0; i < 2; i++) {\n if ((smaller == 1 || y >= i) && (greater == 1 || x <= i)) {\n result =\n Math.max(result, i + cal(index - 1, x < i ? 1 : greater, y > i ? 1 : smaller, a, b));\n }\n }\n return dp[index][greater][smaller] = result;\n }\n\n static int cal(int index, int m, int[] pos) {\n int result = 1;\n\n for (int i = 0; i < pos.length; i++) {\n if (pos[i] == index) {\n result += cal(i, m, pos);\n }\n }\n if (index == m) {\n contains = 1;\n } else if (contains != -1) {\n contains++;\n }\n\n return result;\n }\n\n static int crossProduct(Point a, Point b) {\n return a.x * b.y + a.y * b.x;\n }\n\n static long squareDist(Point a) {\n long x = a.x;\n long y = a.y;\n return x * x + y * y;\n }\n\n static Point minus(Point a, Point b) {\n return new Point(a.x - b.x, a.y - b.y);\n }\n\n public static boolean nextPer(int[] data) {\n int i = data.length - 1;\n while (i > 0 && data[i] < data[i - 1]) {\n i--;\n }\n if (i == 0) {\n return false;\n }\n int j = data.length - 1;\n while (data[j] < data[i - 1]) {\n j--;\n }\n int temp = data[i - 1];\n data[i - 1] = data[j];\n data[j] = temp;\n Arrays.sort(data, i, data.length);\n return true;\n }\n\n static class Point {\n int x, y;\n\n public Point(int x, int y) {\n super();\n this.x = x;\n this.y = y;\n }\n\n public String toString() {\n return \"{\" + x + \" \" + y + \"}\";\n }\n }\n\n static class Entry implements Comparable {\n int x, cost;\n\n public Entry(int x, int cost) {\n super();\n this.x = x;\n this.cost = cost;\n }\n\n public int compareTo(Entry o) {\n\n if (cost > o.cost) {\n return 1;\n } else if (cost == o.cost) {\n return -1;\n }\n\n return 0;\n }\n }\n\n static int gcd(int a, int b) {\n if (b == 0) {\n return a;\n }\n return gcd(b, a % b);\n }\n\n static class Scanner {\n\n BufferedReader br;\n StringTokenizer st;\n\n public Scanner() throws FileNotFoundException {\n\n br = new BufferedReader(new InputStreamReader(System.in));\n }\n\n public String next() {\n\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(br.readLine());\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String nextLine() {\n st = null;\n try {\n return br.readLine();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n\n public boolean endLine() {\n try {\n String next = br.readLine();\n while (next != null && next.trim().isEmpty()) {\n next = br.readLine();\n }\n if (next == null) {\n return true;\n }\n st = new StringTokenizer(next);\n return st.hasMoreTokens();\n } catch (Exception e) {\n throw new RuntimeException();\n }\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n+import java.io.FileNotFoundException;\n import java.io.InputStreamReader;\n import java.io.PrintWriter;\n import java.util.ArrayList;\n+import java.util.Arrays;\n import java.util.Collections;\n-import java.util.Comparator;\n+import java.util.Scanner;\n import java.util.StringTokenizer;\n \n-public class Abood2B {\n-\n- public static void main(String[] args) throws IOException {\n- Scanner sc = new Scanner(System.in);\n+public class Test {\n+ static long mod = 1000000007;\n+ static int[][][] dp;\n+\n+ static int contains;\n+\n+ public static void main(String[] args) throws FileNotFoundException {\n PrintWriter out = new PrintWriter(System.out);\n-\n- int n = sc.nextInt();\n-\n+ Scanner in = new Scanner();\n+ int n = in.nextInt();\n int a = 0;\n int b = 0;\n-\n- ArrayList h = new ArrayList<>();\n-\n+ ArrayList list = new ArrayList();\n for (int i = 0; i < n; i++) {\n- int c = sc.nextInt();\n-\n- for (int j = 0; j < c / 2; j++) {\n- a += sc.nextInt();\n- }\n-\n- if (c % 2 == 1) h.add(sc.nextInt());\n-\n- for (int j = (c + 1) / 2; j < c; j++) {\n- b += sc.nextInt();\n- }\n- }\n-\n- Collections.sort(\n- h,\n- new Comparator() {\n-\n- @Override\n- public int compare(Integer o1, Integer o2) {\n- return o2 - o1;\n- }\n- });\n-\n- for (int i = 0; i < h.size(); i++) {\n- if (i % 2 == 0) a += h.get(i);\n- else b += h.get(i);\n- }\n-\n- System.out.println(a + \" \" + b);\n-\n- out.flush();\n+ int l = in.nextInt();\n+ int[] data = new int[l];\n+ for (int j = 0; j < l; j++) {\n+ data[j] = in.nextInt();\n+ }\n+ if (l % 2 == 1) {\n+ list.add(data[l / 2]);\n+ }\n+ for (int j = 0; j < l / 2; j++) {\n+ a += data[j];\n+ b += data[j + (l / 2) + (l % 2)];\n+ }\n+ }\n+ Collections.sort(list, Collections.reverseOrder());\n+ for (int i = 0; i < list.size(); i++) {\n+ if (i % 2 == 0) {\n+ a += list.get(i);\n+ } else {\n+ b += list.get(i);\n+ }\n+ }\n+ out.println(a + \" \" + b);\n out.close();\n }\n \n+ public static int cal(int index, int greater, int smaller, long a, long b) {\n+ if (index < 0) {\n+ return 0;\n+ }\n+ if (greater == 1 && smaller == 1) {\n+ return dp[index][greater][smaller] = 1 + index;\n+ }\n+ if (dp[index][greater][smaller] != -1) {\n+ return dp[index][greater][smaller];\n+ }\n+ int result = 0;\n+ int x = ((1L << index) & a) != 0 ? 1 : 0;\n+ int y = ((1L << index) & b) != 0 ? 1 : 0;\n+\n+ for (int i = 0; i < 2; i++) {\n+ if ((smaller == 1 || y >= i) && (greater == 1 || x <= i)) {\n+ result =\n+ Math.max(result, i + cal(index - 1, x < i ? 1 : greater, y > i ? 1 : smaller, a, b));\n+ }\n+ }\n+ return dp[index][greater][smaller] = result;\n+ }\n+\n+ static int cal(int index, int m, int[] pos) {\n+ int result = 1;\n+\n+ for (int i = 0; i < pos.length; i++) {\n+ if (pos[i] == index) {\n+ result += cal(i, m, pos);\n+ }\n+ }\n+ if (index == m) {\n+ contains = 1;\n+ } else if (contains != -1) {\n+ contains++;\n+ }\n+\n+ return result;\n+ }\n+\n+ static int crossProduct(Point a, Point b) {\n+ return a.x * b.y + a.y * b.x;\n+ }\n+\n+ static long squareDist(Point a) {\n+ long x = a.x;\n+ long y = a.y;\n+ return x * x + y * y;\n+ }\n+\n+ static Point minus(Point a, Point b) {\n+ return new Point(a.x - b.x, a.y - b.y);\n+ }\n+\n+ public static boolean nextPer(int[] data) {\n+ int i = data.length - 1;\n+ while (i > 0 && data[i] < data[i - 1]) {\n+ i--;\n+ }\n+ if (i == 0) {\n+ return false;\n+ }\n+ int j = data.length - 1;\n+ while (data[j] < data[i - 1]) {\n+ j--;\n+ }\n+ int temp = data[i - 1];\n+ data[i - 1] = data[j];\n+ data[j] = temp;\n+ Arrays.sort(data, i, data.length);\n+ return true;\n+ }\n+\n+ static class Point {\n+ int x, y;\n+\n+ public Point(int x, int y) {\n+ super();\n+ this.x = x;\n+ this.y = y;\n+ }\n+\n+ public String toString() {\n+ return \"{\" + x + \" \" + y + \"}\";\n+ }\n+ }\n+\n+ static class Entry implements Comparable {\n+ int x, cost;\n+\n+ public Entry(int x, int cost) {\n+ super();\n+ this.x = x;\n+ this.cost = cost;\n+ }\n+\n+ public int compareTo(Entry o) {\n+\n+ if (cost > o.cost) {\n+ return 1;\n+ } else if (cost == o.cost) {\n+ return -1;\n+ }\n+\n+ return 0;\n+ }\n+ }\n+\n+ static int gcd(int a, int b) {\n+ if (b == 0) {\n+ return a;\n+ }\n+ return gcd(b, a % b);\n+ }\n+\n static class Scanner {\n \n+ BufferedReader br;\n StringTokenizer st;\n- BufferedReader br;\n-\n- public Scanner(InputStream s) {\n- br = new BufferedReader(new InputStreamReader(s));\n- }\n-\n- public String next() throws IOException {\n- while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());\n+\n+ public Scanner() throws FileNotFoundException {\n+\n+ br = new BufferedReader(new InputStreamReader(System.in));\n+ }\n+\n+ public String next() {\n+\n+ while (st == null || !st.hasMoreTokens()) {\n+ try {\n+ st = new StringTokenizer(br.readLine());\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n return st.nextToken();\n }\n \n- public int nextInt() throws IOException {\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public int nextInt() {\n return Integer.parseInt(next());\n }\n \n- public long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n-\n- public String nextLine() throws IOException {\n- return br.readLine();\n- }\n-\n- public double nextDouble() throws IOException {\n- String x = next();\n- StringBuilder sb = new StringBuilder(\"0\");\n- double res = 0, f = 1;\n- boolean dec = false, neg = false;\n- int start = 0;\n- if (x.charAt(0) == '-') {\n- neg = true;\n- start++;\n- }\n- for (int i = start; i < x.length(); i++)\n- if (x.charAt(i) == '.') {\n- res = Long.parseLong(sb.toString());\n- sb = new StringBuilder(\"0\");\n- dec = true;\n- } else {\n- sb.append(x.charAt(i));\n- if (dec) f *= 10;\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String nextLine() {\n+ st = null;\n+ try {\n+ return br.readLine();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n+ }\n+\n+ public boolean endLine() {\n+ try {\n+ String next = br.readLine();\n+ while (next != null && next.trim().isEmpty()) {\n+ next = br.readLine();\n }\n- res += Long.parseLong(sb.toString()) / f;\n- return res * (neg ? -1 : 1);\n- }\n-\n- public boolean ready() throws IOException {\n- return br.ready();\n+ if (next == null) {\n+ return true;\n+ }\n+ st = new StringTokenizer(next);\n+ return st.hasMoreTokens();\n+ } catch (Exception e) {\n+ throw new RuntimeException();\n+ }\n }\n }\n }", "output": "SLOWER 0.0808", "problem_id": "388_C", "direction": "reversed", "speedup_ratio": 1.0576, "pair_id": "java_9454_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n long time2 = bytesDownloaded2 * t2;\n long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n long timeLeft2 = timeLeft1 - time2;\n if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n ans = Math.min(ans, cost1 + cost2);\n }\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n- long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n+ if (bytesLeft1 * t2 > timeLeft1) {\n+ continue;\n+ }\n+ long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n+ long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n- long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n- long time2 = bytesDownloaded2 * t2;\n- long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n- long timeLeft2 = timeLeft1 - time2;\n- if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n- ans = Math.min(ans, cost1 + cost2);\n- }\n+ ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.0185", "problem_id": "883_C", "direction": "forward", "speedup_ratio": 1.0129, "pair_id": "java_4135_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n long time2 = bytesDownloaded2 * t2;\n long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n long timeLeft2 = timeLeft1 - time2;\n if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n ans = Math.min(ans, cost1 + cost2);\n }\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n- if (bytesLeft1 * t2 > timeLeft1) {\n- continue;\n- }\n- long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n- long bytes2 = bytesLeft1 - bytes0;\n+ long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n- ans = Math.min(ans, cost1 + cost2);\n+ long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n+ long time2 = bytesDownloaded2 * t2;\n+ long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n+ long timeLeft2 = timeLeft1 - time2;\n+ if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n+ ans = Math.min(ans, cost1 + cost2);\n+ }\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 0.0185", "problem_id": "883_C", "direction": "reversed", "speedup_ratio": 1.0129, "pair_id": "java_4135_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n- long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n+ long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.0432", "problem_id": "883_C", "direction": "forward", "speedup_ratio": 1.0304, "pair_id": "java_4133_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n- long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n+ long bytes0 = Math.min(bytesLeft1, (timeLeft1 - bytesLeft1 * t2) / (t0 - t2));\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 0.0432", "problem_id": "883_C", "direction": "reversed", "speedup_ratio": 1.0304, "pair_id": "java_4133_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n long time2 = bytesDownloaded2 * t2;\n long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n long timeLeft2 = timeLeft1 - time2;\n if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n ans = Math.min(ans, cost1 + cost2);\n }\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n- long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n+ if (bytesLeft1 * t2 > timeLeft1) {\n+ continue;\n+ }\n+ long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n+ long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n- long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n- long time2 = bytesDownloaded2 * t2;\n- long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n- long timeLeft2 = timeLeft1 - time2;\n- if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n- ans = Math.min(ans, cost1 + cost2);\n- }\n+ ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "FASTER 0.0617", "problem_id": "883_C", "direction": "forward", "speedup_ratio": 1.0437, "pair_id": "java_4134_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n if (bytesLeft1 * t2 > timeLeft1) {\n continue;\n }\n long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n long bytes2 = bytesLeft1 - bytes0;\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n ans = Math.min(ans, cost1 + cost2);\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.OutputStream;\nimport java.io.PrintWriter;\nimport java.util.StringTokenizer;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n\n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n\n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n\n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n\n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n\n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n\n long cost2 = k2 * p2;\n long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n long time2 = bytesDownloaded2 * t2;\n long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n long timeLeft2 = timeLeft1 - time2;\n if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n ans = Math.min(ans, cost1 + cost2);\n }\n }\n return ans;\n }\n\n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n\n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n\n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n\n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n import java.io.BufferedReader;\n import java.io.IOException;\n import java.io.InputStream;\n import java.io.InputStreamReader;\n import java.io.OutputStream;\n import java.io.PrintWriter;\n import java.util.StringTokenizer;\n \n public class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n FastScanner in = new FastScanner(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskC solver = new TaskC();\n solver.solve(1, in, out);\n out.close();\n }\n \n static class TaskC {\n final long infinity = Long.MAX_VALUE / 3;\n FastScanner in;\n \n public void solve(int testNumber, FastScanner in, PrintWriter out) {\n this.in = in;\n long bytesLeft0 = assertedNextInt();\n long timeLeft0 = assertedNextInt();\n long t0 = assertedNextInt();\n \n long a1 = assertedNextInt();\n long t1 = assertedNextInt();\n long p1 = assertedNextInt();\n \n long a2 = assertedNextInt();\n long t2 = assertedNextInt();\n long p2 = assertedNextInt();\n long u = solve(bytesLeft0, timeLeft0, t0, a1, t1, p1, a2, t2, p2);\n long v = solve(bytesLeft0, timeLeft0, t0, a2, t2, p2, a1, t1, p1);\n long ans = Math.min(u, v);\n if (ans >= infinity) {\n ans = -1;\n }\n out.println(ans);\n }\n \n private long solve(\n long bytesLeft0,\n long timeLeft0,\n long t0,\n long a1,\n long t1,\n long p1,\n long a2,\n long t2,\n long p2) {\n final int N = (int) 1e7 + 20;\n long ans = infinity;\n for (int k1 = 0; k1 <= N; k1++) {\n long cost1 = k1 * p1;\n long bytesDownloaded1 = Math.min(bytesLeft0, k1 * a1);\n long time1 = bytesDownloaded1 * t1;\n long bytesLeft1 = bytesLeft0 - bytesDownloaded1;\n long timeLeft1 = timeLeft0 - time1;\n if (timeLeft1 < 0) {\n continue;\n }\n if (bytesLeft1 == 0) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 * bytesLeft1 <= timeLeft1) {\n ans = Math.min(ans, cost1);\n continue;\n }\n if (t0 <= t2) {\n continue;\n }\n- if (bytesLeft1 * t2 > timeLeft1) {\n- continue;\n- }\n- long bytes0 = (timeLeft1 - bytesLeft1 * t2) / (t0 - t2);\n- long bytes2 = bytesLeft1 - bytes0;\n+ long bytes2 = (bytesLeft1 * t0 - timeLeft1 + (t0 - t2) - 1) / (t0 - t2);\n long k2 = (bytes2 + a2 - 1) / a2;\n \n long cost2 = k2 * p2;\n- ans = Math.min(ans, cost1 + cost2);\n+ long bytesDownloaded2 = Math.min(bytesLeft1, k2 * a2);\n+ long time2 = bytesDownloaded2 * t2;\n+ long bytesLeft2 = bytesLeft1 - bytesDownloaded2;\n+ long timeLeft2 = timeLeft1 - time2;\n+ if (timeLeft2 >= 0 && bytesLeft2 * t0 <= timeLeft2) {\n+ ans = Math.min(ans, cost1 + cost2);\n+ }\n }\n return ans;\n }\n \n private long assertedNextInt() {\n long x = in.nextLong();\n if (x < 1 || x > (int) 1e7) {\n throw new AssertionError();\n }\n return x;\n }\n }\n \n static class FastScanner {\n private BufferedReader in;\n private StringTokenizer st;\n \n public FastScanner(InputStream stream) {\n in = new BufferedReader(new InputStreamReader(stream));\n }\n \n public String next() {\n while (st == null || !st.hasMoreTokens()) {\n try {\n st = new StringTokenizer(in.readLine());\n } catch (IOException e) {\n throw new RuntimeException(e);\n }\n }\n return st.nextToken();\n }\n \n public long nextLong() {\n return Long.parseLong(next());\n }\n }\n }", "output": "SLOWER 0.0617", "problem_id": "883_C", "direction": "reversed", "speedup_ratio": 1.0437, "pair_id": "java_4134_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n long mod = (long) (1E9) + 7;\n\n long rpe(long a) {\n long b = mod - 2;\n long ans = 1;\n while (b != 0) {\n if (b % 2 != 0) ans = (ans * a) % mod;\n b /= 2;\n a = a * a % mod;\n }\n return ans;\n }\n\n long i2 = rpe(2);\n\n long f(long c) {\n return c * (c - 1 + mod) % mod * i2 % mod;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long a[] = new long[n + 10];\n for (int i = 1; i <= n - 1; i++) a[i] = in.nextLong();\n a[0] = 1;\n long c = 1;\n long ans[] = new long[2 * n - 1];\n long dp[][] = new long[2][2 * n - 1];\n int t = 0;\n long v[][] = new long[n + 10][n + 10];\n for (int i = 1; i <= n - 1; i++) {\n v[i][i] = (a[i] - 1 + mod) % mod;\n for (int j = i + 1; j <= n - 1; j++) v[i][j] = v[i][j - 1] * a[j] % mod;\n }\n for (int i = 2; i <= n; i++) {\n c = c * a[i - 1] % mod;\n Arrays.fill(dp[t], 0);\n for (int j = 2; j < 2 * (i - 1); j++) {\n dp[t][j] = dp[t ^ 1][j - 1] % mod;\n }\n dp[t][1] = 1;\n for (int j = 0; j < 2 * n - 1; j++) ans[j] = (ans[j] + dp[t][j] * c % mod) % mod;\n for (int j = i - 1; j >= 1; j--) {\n dp[t][2 * (i - j)] = (dp[t][2 * (i - j)] + v[j][i - 1]) % mod;\n ans[2 * (i - j)] = (ans[2 * (i - j)] + c * v[j][i - 1] % mod * i2 % mod) % mod;\n }\n t = t ^ 1;\n }\n\n for (int i = 1; i < 2 * n - 1; i++) out.print(ans[i] + \" \");\n }\n\n int[] radixSort(int[] f) {\n return radixSort(f, f.length);\n }\n\n int[] radixSort(int[] f, int n) {\n int[] to = new int[n];\n {\n int[] b = new int[65537];\n for (int i = 0; i < n; i++) b[1 + (f[i] & 0xffff)]++;\n for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n for (int i = 0; i < n; i++) to[b[f[i] & 0xffff]++] = f[i];\n int[] d = f;\n f = to;\n to = d;\n }\n {\n int[] b = new int[65537];\n for (int i = 0; i < n; i++) b[1 + (f[i] >>> 16)]++;\n for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n for (int i = 0; i < n; i++) to[b[f[i] >>> 16]++] = f[i];\n int[] d = f;\n f = to;\n to = d;\n }\n return f;\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class path_counting {\n\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.*;\n+import java.math.*;\n import java.util.*;\n \n-public class Main {\n- public static void main(String[] args) {\n- InputStream inputStream = System.in;\n- OutputStream outputStream = System.out;\n- InputReader in = new InputReader(inputStream);\n- PrintWriter out = new PrintWriter(outputStream);\n- TaskE solver = new TaskE();\n- solver.solve(1, in, out);\n- out.flush();\n- out.close();\n+public class path_counting {\n+\n+ private static final int P = 1000000007;\n+\n+ private static long pow(long x, int y) {\n+ long ret = 1;\n+ while (y > 0) {\n+ if (y % 2 == 1) {\n+ ret = ret * x % P;\n+ }\n+ x = x * x % P;\n+ y /= 2;\n+ }\n+ return ret;\n }\n \n- static class TaskE {\n- long mod = (long) (1E9) + 7;\n-\n- long rpe(long a) {\n- long b = mod - 2;\n- long ans = 1;\n- while (b != 0) {\n- if (b % 2 != 0) ans = (ans * a) % mod;\n- b /= 2;\n- a = a * a % mod;\n+ public static void main(String[] args) {\n+ Scanner cin = new Scanner(System.in);\n+ int n = cin.nextInt();\n+ int[] a = new int[n + 1];\n+ long[] rev = new long[n + 1];\n+ long[] res = new long[2 * n + 1];\n+ long[][] down = new long[n + 1][n + 1];\n+ long[][] up = new long[2][2 * n + 1];\n+ for (int i = 1; i < n; ++i) {\n+ a[i] = cin.nextInt();\n+ rev[i] = pow(a[i], P - 2);\n+ }\n+ for (int i = n; i > 0; --i) {\n+ down[i][0] = 1;\n+ for (int j = 1; j < n; ++j) {\n+ if (i + j > n) {\n+ break;\n+ }\n+ down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n- return ans;\n }\n \n- long i2 = rpe(2);\n-\n- long f(long c) {\n- return c * (c - 1 + mod) % mod * i2 % mod;\n+ long number = 1;\n+ for (int i = 1; i <= n; ++i) {\n+ for (int j = 1; j <= n; ++j) {\n+ res[j] = (res[j] + number * down[i][j] % P) % P;\n+ }\n+ number = (number * a[i]) % P;\n }\n-\n- public void solve(int testNumber, InputReader in, PrintWriter out) {\n- int n = in.nextInt();\n- long a[] = new long[n + 10];\n- for (int i = 1; i <= n - 1; i++) a[i] = in.nextLong();\n- a[0] = 1;\n- long c = 1;\n- long ans[] = new long[2 * n - 1];\n- long dp[][] = new long[2][2 * n - 1];\n- int t = 0;\n- long v[][] = new long[n + 10][n + 10];\n- for (int i = 1; i <= n - 1; i++) {\n- v[i][i] = (a[i] - 1 + mod) % mod;\n- for (int j = i + 1; j <= n - 1; j++) v[i][j] = v[i][j - 1] * a[j] % mod;\n+ int pre = 0;\n+ number = a[1];\n+ for (int i = 2; i <= n; ++i) {\n+ int now = 1 - pre;\n+ for (int j = 0; j <= 2 * n - 2; ++j) {\n+ up[now][j] = 0;\n }\n- for (int i = 2; i <= n; i++) {\n- c = c * a[i - 1] % mod;\n- Arrays.fill(dp[t], 0);\n- for (int j = 2; j < 2 * (i - 1); j++) {\n- dp[t][j] = dp[t ^ 1][j - 1] % mod;\n+ up[now][1] = 1;\n+ for (int j = 2; j <= 2 * n - 2; ++j) {\n+ if (j - 1 <= n) {\n+ up[now][j] =\n+ (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n+ } else {\n+ up[now][j] = up[pre][j - 1];\n }\n- dp[t][1] = 1;\n- for (int j = 0; j < 2 * n - 1; j++) ans[j] = (ans[j] + dp[t][j] * c % mod) % mod;\n- for (int j = i - 1; j >= 1; j--) {\n- dp[t][2 * (i - j)] = (dp[t][2 * (i - j)] + v[j][i - 1]) % mod;\n- ans[2 * (i - j)] = (ans[2 * (i - j)] + c * v[j][i - 1] % mod * i2 % mod) % mod;\n- }\n- t = t ^ 1;\n }\n-\n- for (int i = 1; i < 2 * n - 1; i++) out.print(ans[i] + \" \");\n+ for (int j = 1; j <= 2 * n - 2; ++j) {\n+ res[j] = (res[j] + number * up[now][j] % P) % P;\n+ }\n+ number = (number * a[i]) % P;\n+ pre = now;\n }\n-\n- int[] radixSort(int[] f) {\n- return radixSort(f, f.length);\n- }\n-\n- int[] radixSort(int[] f, int n) {\n- int[] to = new int[n];\n- {\n- int[] b = new int[65537];\n- for (int i = 0; i < n; i++) b[1 + (f[i] & 0xffff)]++;\n- for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n- for (int i = 0; i < n; i++) to[b[f[i] & 0xffff]++] = f[i];\n- int[] d = f;\n- f = to;\n- to = d;\n- }\n- {\n- int[] b = new int[65537];\n- for (int i = 0; i < n; i++) b[1 + (f[i] >>> 16)]++;\n- for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n- for (int i = 0; i < n; i++) to[b[f[i] >>> 16]++] = f[i];\n- int[] d = f;\n- f = to;\n- to = d;\n- }\n- return f;\n- }\n- }\n-\n- static class InputReader {\n- BufferedReader br;\n- StringTokenizer st;\n-\n- public InputReader(InputStream stream) {\n- br = new BufferedReader(new InputStreamReader(stream));\n- st = null;\n- }\n-\n- String next() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return null;\n- st = new StringTokenizer(s);\n- }\n- return st.nextToken();\n- }\n-\n- boolean hasMoreTokens() {\n- while (st == null || !st.hasMoreTokens()) {\n- String s = null;\n- try {\n- s = br.readLine();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- if (s == null) return false;\n- st = new StringTokenizer(s);\n- }\n- return true;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n+ for (int i = 1; i <= 2 * n - 2; ++i) {\n+ System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n }", "output": "FASTER 1.0749", "problem_id": "954_H", "direction": "forward", "speedup_ratio": 2.1066, "pair_id": "java_7298_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class path_counting {\n\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.*;\nimport java.util.*;\n\npublic class Main {\n public static void main(String[] args) {\n InputStream inputStream = System.in;\n OutputStream outputStream = System.out;\n InputReader in = new InputReader(inputStream);\n PrintWriter out = new PrintWriter(outputStream);\n TaskE solver = new TaskE();\n solver.solve(1, in, out);\n out.flush();\n out.close();\n }\n\n static class TaskE {\n long mod = (long) (1E9) + 7;\n\n long rpe(long a) {\n long b = mod - 2;\n long ans = 1;\n while (b != 0) {\n if (b % 2 != 0) ans = (ans * a) % mod;\n b /= 2;\n a = a * a % mod;\n }\n return ans;\n }\n\n long i2 = rpe(2);\n\n long f(long c) {\n return c * (c - 1 + mod) % mod * i2 % mod;\n }\n\n public void solve(int testNumber, InputReader in, PrintWriter out) {\n int n = in.nextInt();\n long a[] = new long[n + 10];\n for (int i = 1; i <= n - 1; i++) a[i] = in.nextLong();\n a[0] = 1;\n long c = 1;\n long ans[] = new long[2 * n - 1];\n long dp[][] = new long[2][2 * n - 1];\n int t = 0;\n long v[][] = new long[n + 10][n + 10];\n for (int i = 1; i <= n - 1; i++) {\n v[i][i] = (a[i] - 1 + mod) % mod;\n for (int j = i + 1; j <= n - 1; j++) v[i][j] = v[i][j - 1] * a[j] % mod;\n }\n for (int i = 2; i <= n; i++) {\n c = c * a[i - 1] % mod;\n Arrays.fill(dp[t], 0);\n for (int j = 2; j < 2 * (i - 1); j++) {\n dp[t][j] = dp[t ^ 1][j - 1] % mod;\n }\n dp[t][1] = 1;\n for (int j = 0; j < 2 * n - 1; j++) ans[j] = (ans[j] + dp[t][j] * c % mod) % mod;\n for (int j = i - 1; j >= 1; j--) {\n dp[t][2 * (i - j)] = (dp[t][2 * (i - j)] + v[j][i - 1]) % mod;\n ans[2 * (i - j)] = (ans[2 * (i - j)] + c * v[j][i - 1] % mod * i2 % mod) % mod;\n }\n t = t ^ 1;\n }\n\n for (int i = 1; i < 2 * n - 1; i++) out.print(ans[i] + \" \");\n }\n\n int[] radixSort(int[] f) {\n return radixSort(f, f.length);\n }\n\n int[] radixSort(int[] f, int n) {\n int[] to = new int[n];\n {\n int[] b = new int[65537];\n for (int i = 0; i < n; i++) b[1 + (f[i] & 0xffff)]++;\n for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n for (int i = 0; i < n; i++) to[b[f[i] & 0xffff]++] = f[i];\n int[] d = f;\n f = to;\n to = d;\n }\n {\n int[] b = new int[65537];\n for (int i = 0; i < n; i++) b[1 + (f[i] >>> 16)]++;\n for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n for (int i = 0; i < n; i++) to[b[f[i] >>> 16]++] = f[i];\n int[] d = f;\n f = to;\n to = d;\n }\n return f;\n }\n }\n\n static class InputReader {\n BufferedReader br;\n StringTokenizer st;\n\n public InputReader(InputStream stream) {\n br = new BufferedReader(new InputStreamReader(stream));\n st = null;\n }\n\n String next() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return null;\n st = new StringTokenizer(s);\n }\n return st.nextToken();\n }\n\n boolean hasMoreTokens() {\n while (st == null || !st.hasMoreTokens()) {\n String s = null;\n try {\n s = br.readLine();\n } catch (IOException e) {\n e.printStackTrace();\n }\n if (s == null) return false;\n st = new StringTokenizer(s);\n }\n return true;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n+import java.io.*;\n import java.util.*;\n \n-public class path_counting {\n-\n- private static final int P = 1000000007;\n-\n- private static long pow(long x, int y) {\n- long ret = 1;\n- while (y > 0) {\n- if (y % 2 == 1) {\n- ret = ret * x % P;\n- }\n- x = x * x % P;\n- y /= 2;\n- }\n- return ret;\n+public class Main {\n+ public static void main(String[] args) {\n+ InputStream inputStream = System.in;\n+ OutputStream outputStream = System.out;\n+ InputReader in = new InputReader(inputStream);\n+ PrintWriter out = new PrintWriter(outputStream);\n+ TaskE solver = new TaskE();\n+ solver.solve(1, in, out);\n+ out.flush();\n+ out.close();\n }\n \n- public static void main(String[] args) {\n- Scanner cin = new Scanner(System.in);\n- int n = cin.nextInt();\n- int[] a = new int[n + 1];\n- long[] rev = new long[n + 1];\n- long[] res = new long[2 * n + 1];\n- long[][] down = new long[n + 1][n + 1];\n- long[][] up = new long[2][2 * n + 1];\n- for (int i = 1; i < n; ++i) {\n- a[i] = cin.nextInt();\n- rev[i] = pow(a[i], P - 2);\n- }\n- for (int i = n; i > 0; --i) {\n- down[i][0] = 1;\n- for (int j = 1; j < n; ++j) {\n- if (i + j > n) {\n- break;\n- }\n- down[i][j] = down[i + 1][j - 1] * a[i] % P;\n+ static class TaskE {\n+ long mod = (long) (1E9) + 7;\n+\n+ long rpe(long a) {\n+ long b = mod - 2;\n+ long ans = 1;\n+ while (b != 0) {\n+ if (b % 2 != 0) ans = (ans * a) % mod;\n+ b /= 2;\n+ a = a * a % mod;\n }\n+ return ans;\n }\n \n- long number = 1;\n- for (int i = 1; i <= n; ++i) {\n- for (int j = 1; j <= n; ++j) {\n- res[j] = (res[j] + number * down[i][j] % P) % P;\n+ long i2 = rpe(2);\n+\n+ long f(long c) {\n+ return c * (c - 1 + mod) % mod * i2 % mod;\n+ }\n+\n+ public void solve(int testNumber, InputReader in, PrintWriter out) {\n+ int n = in.nextInt();\n+ long a[] = new long[n + 10];\n+ for (int i = 1; i <= n - 1; i++) a[i] = in.nextLong();\n+ a[0] = 1;\n+ long c = 1;\n+ long ans[] = new long[2 * n - 1];\n+ long dp[][] = new long[2][2 * n - 1];\n+ int t = 0;\n+ long v[][] = new long[n + 10][n + 10];\n+ for (int i = 1; i <= n - 1; i++) {\n+ v[i][i] = (a[i] - 1 + mod) % mod;\n+ for (int j = i + 1; j <= n - 1; j++) v[i][j] = v[i][j - 1] * a[j] % mod;\n }\n- number = (number * a[i]) % P;\n+ for (int i = 2; i <= n; i++) {\n+ c = c * a[i - 1] % mod;\n+ Arrays.fill(dp[t], 0);\n+ for (int j = 2; j < 2 * (i - 1); j++) {\n+ dp[t][j] = dp[t ^ 1][j - 1] % mod;\n+ }\n+ dp[t][1] = 1;\n+ for (int j = 0; j < 2 * n - 1; j++) ans[j] = (ans[j] + dp[t][j] * c % mod) % mod;\n+ for (int j = i - 1; j >= 1; j--) {\n+ dp[t][2 * (i - j)] = (dp[t][2 * (i - j)] + v[j][i - 1]) % mod;\n+ ans[2 * (i - j)] = (ans[2 * (i - j)] + c * v[j][i - 1] % mod * i2 % mod) % mod;\n+ }\n+ t = t ^ 1;\n+ }\n+\n+ for (int i = 1; i < 2 * n - 1; i++) out.print(ans[i] + \" \");\n }\n- int pre = 0;\n- number = a[1];\n- for (int i = 2; i <= n; ++i) {\n- int now = 1 - pre;\n- for (int j = 0; j <= 2 * n - 2; ++j) {\n- up[now][j] = 0;\n+\n+ int[] radixSort(int[] f) {\n+ return radixSort(f, f.length);\n+ }\n+\n+ int[] radixSort(int[] f, int n) {\n+ int[] to = new int[n];\n+ {\n+ int[] b = new int[65537];\n+ for (int i = 0; i < n; i++) b[1 + (f[i] & 0xffff)]++;\n+ for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n+ for (int i = 0; i < n; i++) to[b[f[i] & 0xffff]++] = f[i];\n+ int[] d = f;\n+ f = to;\n+ to = d;\n }\n- up[now][1] = 1;\n- for (int j = 2; j <= 2 * n - 2; ++j) {\n- if (j - 1 <= n) {\n- up[now][j] =\n- (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n- } else {\n- up[now][j] = up[pre][j - 1];\n+ {\n+ int[] b = new int[65537];\n+ for (int i = 0; i < n; i++) b[1 + (f[i] >>> 16)]++;\n+ for (int i = 1; i <= 65536; i++) b[i] += b[i - 1];\n+ for (int i = 0; i < n; i++) to[b[f[i] >>> 16]++] = f[i];\n+ int[] d = f;\n+ f = to;\n+ to = d;\n+ }\n+ return f;\n+ }\n+ }\n+\n+ static class InputReader {\n+ BufferedReader br;\n+ StringTokenizer st;\n+\n+ public InputReader(InputStream stream) {\n+ br = new BufferedReader(new InputStreamReader(stream));\n+ st = null;\n+ }\n+\n+ String next() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n }\n+ if (s == null) return null;\n+ st = new StringTokenizer(s);\n }\n- for (int j = 1; j <= 2 * n - 2; ++j) {\n- res[j] = (res[j] + number * up[now][j] % P) % P;\n+ return st.nextToken();\n+ }\n+\n+ boolean hasMoreTokens() {\n+ while (st == null || !st.hasMoreTokens()) {\n+ String s = null;\n+ try {\n+ s = br.readLine();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ if (s == null) return false;\n+ st = new StringTokenizer(s);\n }\n- number = (number * a[i]) % P;\n- pre = now;\n+ return true;\n }\n- for (int i = 1; i <= 2 * n - 2; ++i) {\n- System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n }\n }\n }", "output": "SLOWER 1.0749", "problem_id": "954_H", "direction": "reversed", "speedup_ratio": 2.1066, "pair_id": "java_7298_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class path_counting {\n\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.math.*;\n-import java.util.*;\n+import java.util.Scanner;\n \n-public class path_counting {\n-\n+public class Main {\n private static final int P = 1000000007;\n \n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n \n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n \n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n }", "output": "FASTER 0.0193", "problem_id": "954_H", "direction": "forward", "speedup_ratio": 1.0135, "pair_id": "java_7296_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class Main {\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.math.*;\nimport java.util.*;\n\npublic class path_counting {\n\n private static final int P = 1000000007;\n\n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n\n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n\n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.math.*;\n+import java.util.*;\n \n-public class Main {\n+public class path_counting {\n+\n private static final int P = 1000000007;\n \n private static long pow(long x, int y) {\n long ret = 1;\n while (y > 0) {\n if (y % 2 == 1) {\n ret = ret * x % P;\n }\n x = x * x % P;\n y /= 2;\n }\n return ret;\n }\n \n public static void main(String[] args) {\n Scanner cin = new Scanner(System.in);\n int n = cin.nextInt();\n int[] a = new int[n + 1];\n long[] rev = new long[n + 1];\n long[] res = new long[2 * n + 1];\n long[][] down = new long[n + 1][n + 1];\n long[][] up = new long[2][2 * n + 1];\n for (int i = 1; i < n; ++i) {\n a[i] = cin.nextInt();\n rev[i] = pow(a[i], P - 2);\n }\n for (int i = n; i > 0; --i) {\n down[i][0] = 1;\n for (int j = 1; j < n; ++j) {\n if (i + j > n) {\n break;\n }\n down[i][j] = down[i + 1][j - 1] * a[i] % P;\n }\n }\n \n long number = 1;\n for (int i = 1; i <= n; ++i) {\n for (int j = 1; j <= n; ++j) {\n res[j] = (res[j] + number * down[i][j] % P) % P;\n }\n number = (number * a[i]) % P;\n }\n int pre = 0;\n number = a[1];\n for (int i = 2; i <= n; ++i) {\n int now = 1 - pre;\n for (int j = 0; j <= 2 * n - 2; ++j) {\n up[now][j] = 0;\n }\n up[now][1] = 1;\n for (int j = 2; j <= 2 * n - 2; ++j) {\n if (j - 1 <= n) {\n up[now][j] =\n (up[pre][j - 1] + down[i - 1][j - 1] * rev[i - 1] % P * (a[i - 1] - 1) % P) % P;\n } else {\n up[now][j] = up[pre][j - 1];\n }\n }\n for (int j = 1; j <= 2 * n - 2; ++j) {\n res[j] = (res[j] + number * up[now][j] % P) % P;\n }\n number = (number * a[i]) % P;\n pre = now;\n }\n for (int i = 1; i <= 2 * n - 2; ++i) {\n System.out.print(res[i] * pow(2, P - 2) % P + \" \");\n }\n }\n }", "output": "SLOWER 0.0193", "problem_id": "954_H", "direction": "reversed", "speedup_ratio": 1.0135, "pair_id": "java_7296_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.ByteArrayInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.PrintWriter;\nimport java.nio.charset.StandardCharsets;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class c {\n\n static class Solver {\n\n int N, dist[][], size[][], stsz[];\n ArrayList adj[];\n\n void distDFS(int vtx, int rt, int par, int dep) {\n dist[rt][vtx] = dep;\n for (int v : adj[vtx]) if (v != par) distDFS(v, rt, vtx, dep + 1);\n }\n\n void sizeDFS(int v, int p) {\n stsz[v] = 1;\n for (int w : adj[v]) {\n if (w == p) continue;\n sizeDFS(w, v);\n stsz[v] += stsz[w];\n size[v][w] = stsz[w];\n size[w][v] = N - size[v][w];\n }\n }\n\n @SuppressWarnings(\"unchecked\")\n void solve(FastScanner s, PrintWriter out) {\n Arrays.setAll(adj = new ArrayList[N = s.nextInt()], x -> new ArrayList<>());\n for (int i = 1, u, v; i < N; i++) {\n u = s.nextInt() - 1;\n v = s.nextInt() - 1;\n adj[u].add(v);\n adj[v].add(u);\n }\n\n dist = new int[N][N];\n for (int rt = 0; rt < N; rt++) distDFS(rt, rt, -1, 0);\n size = new int[N][N];\n stsz = new int[N];\n sizeDFS(0, -1);\n\n memo = new long[N][N];\n for (long[] row : memo) Arrays.fill(row, -1);\n\n long mx = 0, p;\n for (int i = 0; i < N; i++)\n for (int j : adj[i])\n if (i < j) {\n p = size[i][j] * size[j][i] + dp(i, j);\n if (p > mx) mx = p;\n }\n out.println(mx);\n }\n\n long memo[][];\n\n long dp(int u, int v) {\n if (u > v) u = v ^ u ^ (v = u);\n if (memo[u][v] != -1) return memo[u][v];\n long max = 0, poss, usz = 0, vsz = 0;\n for (int w : adj[u])\n if (dist[u][v] > dist[w][v]) {\n usz = size[w][u];\n break;\n }\n for (int w : adj[v])\n if (dist[v][u] > dist[w][u]) {\n vsz = size[w][v];\n break;\n }\n\n for (int w : adj[u]) {\n if (dist[u][v] > dist[w][v]) continue;\n poss = size[u][w] * vsz + dp(w, v);\n if (poss > max) max = poss;\n }\n for (int w : adj[v]) {\n if (dist[v][u] > dist[w][u]) continue;\n poss = size[v][w] * usz + dp(w, u);\n if (poss > max) max = poss;\n }\n return memo[u][v] = max;\n }\n }\n\n public static void main(String[] args) {\n FastScanner s = new FastScanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n new Solver().solve(s, out);\n out.close();\n s.close();\n }\n\n static class FastScanner {\n private InputStream stream;\n private byte[] buf = new byte[1 << 22];\n private int curChar;\n private int numChars;\n\n public FastScanner(InputStream stream) {\n this.stream = stream;\n }\n\n public FastScanner(File f) throws FileNotFoundException {\n this(new FileInputStream(f));\n }\n\n public FastScanner(String s) {\n this.stream = new ByteArrayInputStream(s.getBytes(StandardCharsets.UTF_8));\n }\n\n void close() {\n try {\n stream.close();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n\n int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n boolean isEndline(int c) {\n return c == '\\n' || c == '\\r' || c == -1;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String next() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n StringBuilder res = new StringBuilder();\n do {\n res.appendCodePoint(c);\n c = read();\n } while (!isSpaceChar(c));\n return res.toString();\n }\n\n public String nextLine() {\n int c = read();\n while (isEndline(c)) c = read();\n StringBuilder res = new StringBuilder();\n do {\n res.appendCodePoint(c);\n c = read();\n } while (!isEndline(c));\n return res.toString();\n }\n\n public int[] nextIntArray(int N) {\n int[] ret = new int[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextInt();\n return ret;\n }\n\n public int[][] next2DIntArray(int N, int M) {\n int[][] ret = new int[N][];\n for (int i = 0; i < N; i++) ret[i] = this.nextIntArray(M);\n return ret;\n }\n\n public long[] nextLongArray(int N) {\n long[] ret = new long[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextLong();\n return ret;\n }\n\n public long[][] next2DLongArray(int N, int M) {\n long[][] ret = new long[N][];\n for (int i = 0; i < N; i++) ret[i] = nextLongArray(M);\n return ret;\n }\n\n public double[] nextDoubleArray(int N) {\n double[] ret = new double[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextDouble();\n return ret;\n }\n\n public double[][] next2DDoubleArray(int N, int M) {\n double[][] ret = new double[N][];\n for (int i = 0; i < N; i++) ret[i] = this.nextDoubleArray(M);\n return ret;\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.io.*;\nimport java.util.*;\n\npublic class test {\n static final int MOD = 1000000007;\n static final int intMax = 1000000000;\n static final int intMin = -1000000000;\n static final int[] dx = {0, 0, -1, 1};\n static final int[] dy = {-1, 1, 0, 0};\n\n static int add(int a, int b) {\n return (a + b) % MOD;\n }\n\n static int sub(int a, int b) {\n return (a - b + MOD) % MOD;\n }\n\n static int mult(int a, int b) {\n return (int) ((((long) (a)) * b) % MOD);\n }\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[360];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n static class Sb_Output implements Closeable, Flushable {\n StringBuilder sb;\n OutputStream os;\n int BUFFER_SIZE;\n\n public Sb_Output(String s) throws Exception {\n os = new BufferedOutputStream(new FileOutputStream(new File(s)));\n BUFFER_SIZE = 1 << 16;\n sb = new StringBuilder(BUFFER_SIZE);\n }\n\n public void print(String s) {\n sb.append(s);\n if (sb.length() >= (BUFFER_SIZE >> 1)) {\n flush();\n }\n }\n\n public void println(String s) {\n print(s);\n print(\"\\n\");\n }\n\n public void println(int i) {\n println(\"\" + i);\n }\n\n public void println(long i) {\n println(\"\" + i);\n }\n\n public void flush() {\n try {\n os.write(sb.toString().getBytes());\n sb = new StringBuilder(BUFFER_SIZE);\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n }\n\n static ArrayList[] adj;\n static long results[][];\n\n public static void main(String[] args) throws Exception {\n Reader in = new Reader();\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n int n = Integer.parseInt(br.readLine());\n adj = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n adj[i] = new ArrayList();\n }\n for (int i = 0; i < n - 1; ++i) {\n StringTokenizer st = new StringTokenizer(br.readLine());\n int u = Integer.parseInt(st.nextToken()) - 1;\n int v = Integer.parseInt(st.nextToken()) - 1;\n adj[u].add(v);\n adj[v].add(u);\n }\n sz = new int[n];\n cpar = new int[n];\n vis = new boolean[n];\n results = new long[n][n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(results[i], -1);\n }\n long ret = 0;\n for (int cnd = 0; cnd < n; ++cnd) {\n long ans = 0;\n dfs(cnd, -1);\n int mx = 0, mxind = 0;\n for (int i : adj[cnd]) {\n if (sz[i] > mx) {\n mx = sz[i];\n mxind = i;\n }\n }\n ans += (long) mx * (n - mx);\n\n long max = 0;\n sz[cnd] = n - mx;\n for (int i : adj[cnd]) {\n if (i == mxind) continue;\n max = max(max, solve(i, cnd, mxind, cnd));\n }\n for (int i : adj[mxind]) {\n if (i == cnd) continue;\n max = max(max, solve(i, mxind, cnd, mxind));\n }\n ret = max(ret, max + ans);\n }\n System.out.println(ret);\n in.close();\n }\n\n static long solve(int d1, int p1, int d2, int p2) {\n if (results[d1][d2] != -1) {\n return results[d1][d2];\n }\n long mx = 0;\n for (int i : adj[d1]) {\n if (i == p1 || i == d2) continue;\n mx = max(mx, solve(i, d1, d2, p2));\n }\n for (int i : adj[d2]) {\n if (i == p2 || i == d1) continue;\n mx = max(mx, solve(d1, p1, i, d2));\n }\n\n results[d1][d2] = results[d2][d1] = mx + (long) sz[d1] * sz[d2];\n return mx + (long) sz[d1] * sz[d2];\n }\n\n static class pair {\n int x, y, same;\n\n pair(int a, int b) {\n x = a;\n y = b;\n same = 0;\n }\n }\n\n static int[] sz, cpar;\n static boolean vis[];\n static int curans;\n\n static void dfs(int n, int p) {\n sz[n] = 1;\n for (int v : adj[n])\n if (v != p && !vis[v]) {\n dfs(v, n);\n sz[n] += sz[v];\n }\n }\n\n static int centroid(int n) {\n dfs(n, -1);\n int num = sz[n];\n int p = -1;\n do {\n int nxt = -1;\n for (int v : adj[n])\n if (v != p && !vis[v]) {\n if (2 * sz[v] > num) nxt = v;\n }\n p = n;\n n = nxt;\n } while (~n != 0);\n return p;\n }\n\n static void centroid_decomp(int n, int p) {\n int c = centroid(n);\n vis[c] = true;\n cpar[c] = p;\n for (int v : adj[c])\n if (!vis[v]) {\n centroid_decomp(v, c);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.ByteArrayInputStream;\n-import java.io.File;\n-import java.io.FileInputStream;\n-import java.io.FileNotFoundException;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.PrintWriter;\n-import java.nio.charset.StandardCharsets;\n-import java.util.ArrayList;\n-import java.util.Arrays;\n-import java.util.InputMismatchException;\n-\n-public class c {\n-\n- static class Solver {\n-\n- int N, dist[][], size[][], stsz[];\n- ArrayList adj[];\n-\n- void distDFS(int vtx, int rt, int par, int dep) {\n- dist[rt][vtx] = dep;\n- for (int v : adj[vtx]) if (v != par) distDFS(v, rt, vtx, dep + 1);\n- }\n-\n- void sizeDFS(int v, int p) {\n- stsz[v] = 1;\n- for (int w : adj[v]) {\n- if (w == p) continue;\n- sizeDFS(w, v);\n- stsz[v] += stsz[w];\n- size[v][w] = stsz[w];\n- size[w][v] = N - size[v][w];\n- }\n- }\n-\n- @SuppressWarnings(\"unchecked\")\n- void solve(FastScanner s, PrintWriter out) {\n- Arrays.setAll(adj = new ArrayList[N = s.nextInt()], x -> new ArrayList<>());\n- for (int i = 1, u, v; i < N; i++) {\n- u = s.nextInt() - 1;\n- v = s.nextInt() - 1;\n- adj[u].add(v);\n- adj[v].add(u);\n- }\n-\n- dist = new int[N][N];\n- for (int rt = 0; rt < N; rt++) distDFS(rt, rt, -1, 0);\n- size = new int[N][N];\n- stsz = new int[N];\n- sizeDFS(0, -1);\n-\n- memo = new long[N][N];\n- for (long[] row : memo) Arrays.fill(row, -1);\n-\n- long mx = 0, p;\n- for (int i = 0; i < N; i++)\n- for (int j : adj[i])\n- if (i < j) {\n- p = size[i][j] * size[j][i] + dp(i, j);\n- if (p > mx) mx = p;\n- }\n- out.println(mx);\n- }\n-\n- long memo[][];\n-\n- long dp(int u, int v) {\n- if (u > v) u = v ^ u ^ (v = u);\n- if (memo[u][v] != -1) return memo[u][v];\n- long max = 0, poss, usz = 0, vsz = 0;\n- for (int w : adj[u])\n- if (dist[u][v] > dist[w][v]) {\n- usz = size[w][u];\n- break;\n+import static java.lang.Math.*;\n+\n+import java.io.*;\n+import java.util.*;\n+\n+public class test {\n+ static final int MOD = 1000000007;\n+ static final int intMax = 1000000000;\n+ static final int intMin = -1000000000;\n+ static final int[] dx = {0, 0, -1, 1};\n+ static final int[] dy = {-1, 1, 0, 0};\n+\n+ static int add(int a, int b) {\n+ return (a + b) % MOD;\n+ }\n+\n+ static int sub(int a, int b) {\n+ return (a - b + MOD) % MOD;\n+ }\n+\n+ static int mult(int a, int b) {\n+ return (int) ((((long) (a)) * b) % MOD);\n+ }\n+\n+ static class Reader {\n+ private final int BUFFER_SIZE = 1 << 16;\n+ private DataInputStream din;\n+ private byte[] buffer;\n+ private int bufferPointer, bytesRead;\n+\n+ public Reader() {\n+ din = new DataInputStream(System.in);\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public Reader(String file_name) throws IOException {\n+ din = new DataInputStream(new FileInputStream(file_name));\n+ buffer = new byte[BUFFER_SIZE];\n+ bufferPointer = bytesRead = 0;\n+ }\n+\n+ public String readLine() throws IOException {\n+ byte[] buf = new byte[360];\n+ int cnt = 0, c;\n+ while ((c = read()) != -1) {\n+ if (c == '\\n') break;\n+ buf[cnt++] = (byte) c;\n+ }\n+ return new String(buf, 0, cnt);\n+ }\n+\n+ public int nextInt() throws IOException {\n+ int ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public long nextLong() throws IOException {\n+ long ret = 0;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ public double nextDouble() throws IOException {\n+ double ret = 0, div = 1;\n+ byte c = read();\n+ while (c <= ' ') c = read();\n+ boolean neg = (c == '-');\n+ if (neg) c = read();\n+\n+ do {\n+ ret = ret * 10 + c - '0';\n+ } while ((c = read()) >= '0' && c <= '9');\n+\n+ if (c == '.') {\n+ while ((c = read()) >= '0' && c <= '9') {\n+ ret += (c - '0') / (div *= 10);\n }\n- for (int w : adj[v])\n- if (dist[v][u] > dist[w][u]) {\n- vsz = size[w][v];\n- break;\n- }\n-\n- for (int w : adj[u]) {\n- if (dist[u][v] > dist[w][v]) continue;\n- poss = size[u][w] * vsz + dp(w, v);\n- if (poss > max) max = poss;\n- }\n- for (int w : adj[v]) {\n- if (dist[v][u] > dist[w][u]) continue;\n- poss = size[v][w] * usz + dp(w, u);\n- if (poss > max) max = poss;\n- }\n- return memo[u][v] = max;\n- }\n- }\n-\n- public static void main(String[] args) {\n- FastScanner s = new FastScanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- new Solver().solve(s, out);\n- out.close();\n- s.close();\n- }\n-\n- static class FastScanner {\n- private InputStream stream;\n- private byte[] buf = new byte[1 << 22];\n- private int curChar;\n- private int numChars;\n-\n- public FastScanner(InputStream stream) {\n- this.stream = stream;\n- }\n-\n- public FastScanner(File f) throws FileNotFoundException {\n- this(new FileInputStream(f));\n- }\n-\n- public FastScanner(String s) {\n- this.stream = new ByteArrayInputStream(s.getBytes(StandardCharsets.UTF_8));\n- }\n-\n- void close() {\n+ }\n+\n+ if (neg) return -ret;\n+ return ret;\n+ }\n+\n+ private void fillBuffer() throws IOException {\n+ bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n+ if (bytesRead == -1) buffer[0] = -1;\n+ }\n+\n+ private byte read() throws IOException {\n+ if (bufferPointer == bytesRead) fillBuffer();\n+ return buffer[bufferPointer++];\n+ }\n+\n+ public void close() throws IOException {\n+ if (din == null) return;\n+ din.close();\n+ }\n+ }\n+\n+ static class Sb_Output implements Closeable, Flushable {\n+ StringBuilder sb;\n+ OutputStream os;\n+ int BUFFER_SIZE;\n+\n+ public Sb_Output(String s) throws Exception {\n+ os = new BufferedOutputStream(new FileOutputStream(new File(s)));\n+ BUFFER_SIZE = 1 << 16;\n+ sb = new StringBuilder(BUFFER_SIZE);\n+ }\n+\n+ public void print(String s) {\n+ sb.append(s);\n+ if (sb.length() >= (BUFFER_SIZE >> 1)) {\n+ flush();\n+ }\n+ }\n+\n+ public void println(String s) {\n+ print(s);\n+ print(\"\\n\");\n+ }\n+\n+ public void println(int i) {\n+ println(\"\" + i);\n+ }\n+\n+ public void println(long i) {\n+ println(\"\" + i);\n+ }\n+\n+ public void flush() {\n try {\n- stream.close();\n+ os.write(sb.toString().getBytes());\n+ sb = new StringBuilder(BUFFER_SIZE);\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n \n- int read() {\n- if (numChars == -1) throw new InputMismatchException();\n- if (curChar >= numChars) {\n- curChar = 0;\n- try {\n- numChars = stream.read(buf);\n- } catch (IOException e) {\n- throw new InputMismatchException();\n+ public void close() {\n+ flush();\n+ try {\n+ os.close();\n+ } catch (IOException e) {\n+ e.printStackTrace();\n+ }\n+ }\n+ }\n+\n+ static ArrayList[] adj;\n+ static long results[][];\n+\n+ public static void main(String[] args) throws Exception {\n+ Reader in = new Reader();\n+\n+ BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n+\n+ int n = Integer.parseInt(br.readLine());\n+ adj = new ArrayList[n];\n+ for (int i = 0; i < n; ++i) {\n+ adj[i] = new ArrayList();\n+ }\n+ for (int i = 0; i < n - 1; ++i) {\n+ StringTokenizer st = new StringTokenizer(br.readLine());\n+ int u = Integer.parseInt(st.nextToken()) - 1;\n+ int v = Integer.parseInt(st.nextToken()) - 1;\n+ adj[u].add(v);\n+ adj[v].add(u);\n+ }\n+ sz = new int[n];\n+ cpar = new int[n];\n+ vis = new boolean[n];\n+ results = new long[n][n];\n+ for (int i = 0; i < n; ++i) {\n+ Arrays.fill(results[i], -1);\n+ }\n+ long ret = 0;\n+ for (int cnd = 0; cnd < n; ++cnd) {\n+ long ans = 0;\n+ dfs(cnd, -1);\n+ int mx = 0, mxind = 0;\n+ for (int i : adj[cnd]) {\n+ if (sz[i] > mx) {\n+ mx = sz[i];\n+ mxind = i;\n }\n- if (numChars <= 0) return -1;\n- }\n- return buf[curChar++];\n- }\n-\n- boolean isSpaceChar(int c) {\n- return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n- }\n-\n- boolean isEndline(int c) {\n- return c == '\\n' || c == '\\r' || c == -1;\n- }\n-\n- public int nextInt() {\n- return Integer.parseInt(next());\n- }\n-\n- public long nextLong() {\n- return Long.parseLong(next());\n- }\n-\n- public double nextDouble() {\n- return Double.parseDouble(next());\n- }\n-\n- public String next() {\n- int c = read();\n- while (isSpaceChar(c)) c = read();\n- StringBuilder res = new StringBuilder();\n- do {\n- res.appendCodePoint(c);\n- c = read();\n- } while (!isSpaceChar(c));\n- return res.toString();\n- }\n-\n- public String nextLine() {\n- int c = read();\n- while (isEndline(c)) c = read();\n- StringBuilder res = new StringBuilder();\n- do {\n- res.appendCodePoint(c);\n- c = read();\n- } while (!isEndline(c));\n- return res.toString();\n- }\n-\n- public int[] nextIntArray(int N) {\n- int[] ret = new int[N];\n- for (int i = 0; i < N; i++) ret[i] = this.nextInt();\n- return ret;\n- }\n-\n- public int[][] next2DIntArray(int N, int M) {\n- int[][] ret = new int[N][];\n- for (int i = 0; i < N; i++) ret[i] = this.nextIntArray(M);\n- return ret;\n- }\n-\n- public long[] nextLongArray(int N) {\n- long[] ret = new long[N];\n- for (int i = 0; i < N; i++) ret[i] = this.nextLong();\n- return ret;\n- }\n-\n- public long[][] next2DLongArray(int N, int M) {\n- long[][] ret = new long[N][];\n- for (int i = 0; i < N; i++) ret[i] = nextLongArray(M);\n- return ret;\n- }\n-\n- public double[] nextDoubleArray(int N) {\n- double[] ret = new double[N];\n- for (int i = 0; i < N; i++) ret[i] = this.nextDouble();\n- return ret;\n- }\n-\n- public double[][] next2DDoubleArray(int N, int M) {\n- double[][] ret = new double[N][];\n- for (int i = 0; i < N; i++) ret[i] = this.nextDoubleArray(M);\n- return ret;\n- }\n+ }\n+ ans += (long) mx * (n - mx);\n+\n+ long max = 0;\n+ sz[cnd] = n - mx;\n+ for (int i : adj[cnd]) {\n+ if (i == mxind) continue;\n+ max = max(max, solve(i, cnd, mxind, cnd));\n+ }\n+ for (int i : adj[mxind]) {\n+ if (i == cnd) continue;\n+ max = max(max, solve(i, mxind, cnd, mxind));\n+ }\n+ ret = max(ret, max + ans);\n+ }\n+ System.out.println(ret);\n+ in.close();\n+ }\n+\n+ static long solve(int d1, int p1, int d2, int p2) {\n+ if (results[d1][d2] != -1) {\n+ return results[d1][d2];\n+ }\n+ long mx = 0;\n+ for (int i : adj[d1]) {\n+ if (i == p1 || i == d2) continue;\n+ mx = max(mx, solve(i, d1, d2, p2));\n+ }\n+ for (int i : adj[d2]) {\n+ if (i == p2 || i == d1) continue;\n+ mx = max(mx, solve(d1, p1, i, d2));\n+ }\n+\n+ results[d1][d2] = results[d2][d1] = mx + (long) sz[d1] * sz[d2];\n+ return mx + (long) sz[d1] * sz[d2];\n+ }\n+\n+ static class pair {\n+ int x, y, same;\n+\n+ pair(int a, int b) {\n+ x = a;\n+ y = b;\n+ same = 0;\n+ }\n+ }\n+\n+ static int[] sz, cpar;\n+ static boolean vis[];\n+ static int curans;\n+\n+ static void dfs(int n, int p) {\n+ sz[n] = 1;\n+ for (int v : adj[n])\n+ if (v != p && !vis[v]) {\n+ dfs(v, n);\n+ sz[n] += sz[v];\n+ }\n+ }\n+\n+ static int centroid(int n) {\n+ dfs(n, -1);\n+ int num = sz[n];\n+ int p = -1;\n+ do {\n+ int nxt = -1;\n+ for (int v : adj[n])\n+ if (v != p && !vis[v]) {\n+ if (2 * sz[v] > num) nxt = v;\n+ }\n+ p = n;\n+ n = nxt;\n+ } while (~n != 0);\n+ return p;\n+ }\n+\n+ static void centroid_decomp(int n, int p) {\n+ int c = centroid(n);\n+ vis[c] = true;\n+ cpar[c] = p;\n+ for (int v : adj[c])\n+ if (!vis[v]) {\n+ centroid_decomp(v, c);\n+ }\n }\n }", "output": "FASTER 4.9781", "problem_id": "1292_C", "direction": "forward", "speedup_ratio": 31.5178, "pair_id": "java_12857_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport static java.lang.Math.*;\n\nimport java.io.*;\nimport java.util.*;\n\npublic class test {\n static final int MOD = 1000000007;\n static final int intMax = 1000000000;\n static final int intMin = -1000000000;\n static final int[] dx = {0, 0, -1, 1};\n static final int[] dy = {-1, 1, 0, 0};\n\n static int add(int a, int b) {\n return (a + b) % MOD;\n }\n\n static int sub(int a, int b) {\n return (a - b + MOD) % MOD;\n }\n\n static int mult(int a, int b) {\n return (int) ((((long) (a)) * b) % MOD);\n }\n\n static class Reader {\n private final int BUFFER_SIZE = 1 << 16;\n private DataInputStream din;\n private byte[] buffer;\n private int bufferPointer, bytesRead;\n\n public Reader() {\n din = new DataInputStream(System.in);\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public Reader(String file_name) throws IOException {\n din = new DataInputStream(new FileInputStream(file_name));\n buffer = new byte[BUFFER_SIZE];\n bufferPointer = bytesRead = 0;\n }\n\n public String readLine() throws IOException {\n byte[] buf = new byte[360];\n int cnt = 0, c;\n while ((c = read()) != -1) {\n if (c == '\\n') break;\n buf[cnt++] = (byte) c;\n }\n return new String(buf, 0, cnt);\n }\n\n public int nextInt() throws IOException {\n int ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (neg) return -ret;\n return ret;\n }\n\n public long nextLong() throws IOException {\n long ret = 0;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n if (neg) return -ret;\n return ret;\n }\n\n public double nextDouble() throws IOException {\n double ret = 0, div = 1;\n byte c = read();\n while (c <= ' ') c = read();\n boolean neg = (c == '-');\n if (neg) c = read();\n\n do {\n ret = ret * 10 + c - '0';\n } while ((c = read()) >= '0' && c <= '9');\n\n if (c == '.') {\n while ((c = read()) >= '0' && c <= '9') {\n ret += (c - '0') / (div *= 10);\n }\n }\n\n if (neg) return -ret;\n return ret;\n }\n\n private void fillBuffer() throws IOException {\n bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n if (bytesRead == -1) buffer[0] = -1;\n }\n\n private byte read() throws IOException {\n if (bufferPointer == bytesRead) fillBuffer();\n return buffer[bufferPointer++];\n }\n\n public void close() throws IOException {\n if (din == null) return;\n din.close();\n }\n }\n\n static class Sb_Output implements Closeable, Flushable {\n StringBuilder sb;\n OutputStream os;\n int BUFFER_SIZE;\n\n public Sb_Output(String s) throws Exception {\n os = new BufferedOutputStream(new FileOutputStream(new File(s)));\n BUFFER_SIZE = 1 << 16;\n sb = new StringBuilder(BUFFER_SIZE);\n }\n\n public void print(String s) {\n sb.append(s);\n if (sb.length() >= (BUFFER_SIZE >> 1)) {\n flush();\n }\n }\n\n public void println(String s) {\n print(s);\n print(\"\\n\");\n }\n\n public void println(int i) {\n println(\"\" + i);\n }\n\n public void println(long i) {\n println(\"\" + i);\n }\n\n public void flush() {\n try {\n os.write(sb.toString().getBytes());\n sb = new StringBuilder(BUFFER_SIZE);\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n\n public void close() {\n flush();\n try {\n os.close();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n }\n\n static ArrayList[] adj;\n static long results[][];\n\n public static void main(String[] args) throws Exception {\n Reader in = new Reader();\n\n BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n\n int n = Integer.parseInt(br.readLine());\n adj = new ArrayList[n];\n for (int i = 0; i < n; ++i) {\n adj[i] = new ArrayList();\n }\n for (int i = 0; i < n - 1; ++i) {\n StringTokenizer st = new StringTokenizer(br.readLine());\n int u = Integer.parseInt(st.nextToken()) - 1;\n int v = Integer.parseInt(st.nextToken()) - 1;\n adj[u].add(v);\n adj[v].add(u);\n }\n sz = new int[n];\n cpar = new int[n];\n vis = new boolean[n];\n results = new long[n][n];\n for (int i = 0; i < n; ++i) {\n Arrays.fill(results[i], -1);\n }\n long ret = 0;\n for (int cnd = 0; cnd < n; ++cnd) {\n long ans = 0;\n dfs(cnd, -1);\n int mx = 0, mxind = 0;\n for (int i : adj[cnd]) {\n if (sz[i] > mx) {\n mx = sz[i];\n mxind = i;\n }\n }\n ans += (long) mx * (n - mx);\n\n long max = 0;\n sz[cnd] = n - mx;\n for (int i : adj[cnd]) {\n if (i == mxind) continue;\n max = max(max, solve(i, cnd, mxind, cnd));\n }\n for (int i : adj[mxind]) {\n if (i == cnd) continue;\n max = max(max, solve(i, mxind, cnd, mxind));\n }\n ret = max(ret, max + ans);\n }\n System.out.println(ret);\n in.close();\n }\n\n static long solve(int d1, int p1, int d2, int p2) {\n if (results[d1][d2] != -1) {\n return results[d1][d2];\n }\n long mx = 0;\n for (int i : adj[d1]) {\n if (i == p1 || i == d2) continue;\n mx = max(mx, solve(i, d1, d2, p2));\n }\n for (int i : adj[d2]) {\n if (i == p2 || i == d1) continue;\n mx = max(mx, solve(d1, p1, i, d2));\n }\n\n results[d1][d2] = results[d2][d1] = mx + (long) sz[d1] * sz[d2];\n return mx + (long) sz[d1] * sz[d2];\n }\n\n static class pair {\n int x, y, same;\n\n pair(int a, int b) {\n x = a;\n y = b;\n same = 0;\n }\n }\n\n static int[] sz, cpar;\n static boolean vis[];\n static int curans;\n\n static void dfs(int n, int p) {\n sz[n] = 1;\n for (int v : adj[n])\n if (v != p && !vis[v]) {\n dfs(v, n);\n sz[n] += sz[v];\n }\n }\n\n static int centroid(int n) {\n dfs(n, -1);\n int num = sz[n];\n int p = -1;\n do {\n int nxt = -1;\n for (int v : adj[n])\n if (v != p && !vis[v]) {\n if (2 * sz[v] > num) nxt = v;\n }\n p = n;\n n = nxt;\n } while (~n != 0);\n return p;\n }\n\n static void centroid_decomp(int n, int p) {\n int c = centroid(n);\n vis[c] = true;\n cpar[c] = p;\n for (int v : adj[c])\n if (!vis[v]) {\n centroid_decomp(v, c);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.ByteArrayInputStream;\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileNotFoundException;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.PrintWriter;\nimport java.nio.charset.StandardCharsets;\nimport java.util.ArrayList;\nimport java.util.Arrays;\nimport java.util.InputMismatchException;\n\npublic class c {\n\n static class Solver {\n\n int N, dist[][], size[][], stsz[];\n ArrayList adj[];\n\n void distDFS(int vtx, int rt, int par, int dep) {\n dist[rt][vtx] = dep;\n for (int v : adj[vtx]) if (v != par) distDFS(v, rt, vtx, dep + 1);\n }\n\n void sizeDFS(int v, int p) {\n stsz[v] = 1;\n for (int w : adj[v]) {\n if (w == p) continue;\n sizeDFS(w, v);\n stsz[v] += stsz[w];\n size[v][w] = stsz[w];\n size[w][v] = N - size[v][w];\n }\n }\n\n @SuppressWarnings(\"unchecked\")\n void solve(FastScanner s, PrintWriter out) {\n Arrays.setAll(adj = new ArrayList[N = s.nextInt()], x -> new ArrayList<>());\n for (int i = 1, u, v; i < N; i++) {\n u = s.nextInt() - 1;\n v = s.nextInt() - 1;\n adj[u].add(v);\n adj[v].add(u);\n }\n\n dist = new int[N][N];\n for (int rt = 0; rt < N; rt++) distDFS(rt, rt, -1, 0);\n size = new int[N][N];\n stsz = new int[N];\n sizeDFS(0, -1);\n\n memo = new long[N][N];\n for (long[] row : memo) Arrays.fill(row, -1);\n\n long mx = 0, p;\n for (int i = 0; i < N; i++)\n for (int j : adj[i])\n if (i < j) {\n p = size[i][j] * size[j][i] + dp(i, j);\n if (p > mx) mx = p;\n }\n out.println(mx);\n }\n\n long memo[][];\n\n long dp(int u, int v) {\n if (u > v) u = v ^ u ^ (v = u);\n if (memo[u][v] != -1) return memo[u][v];\n long max = 0, poss, usz = 0, vsz = 0;\n for (int w : adj[u])\n if (dist[u][v] > dist[w][v]) {\n usz = size[w][u];\n break;\n }\n for (int w : adj[v])\n if (dist[v][u] > dist[w][u]) {\n vsz = size[w][v];\n break;\n }\n\n for (int w : adj[u]) {\n if (dist[u][v] > dist[w][v]) continue;\n poss = size[u][w] * vsz + dp(w, v);\n if (poss > max) max = poss;\n }\n for (int w : adj[v]) {\n if (dist[v][u] > dist[w][u]) continue;\n poss = size[v][w] * usz + dp(w, u);\n if (poss > max) max = poss;\n }\n return memo[u][v] = max;\n }\n }\n\n public static void main(String[] args) {\n FastScanner s = new FastScanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n new Solver().solve(s, out);\n out.close();\n s.close();\n }\n\n static class FastScanner {\n private InputStream stream;\n private byte[] buf = new byte[1 << 22];\n private int curChar;\n private int numChars;\n\n public FastScanner(InputStream stream) {\n this.stream = stream;\n }\n\n public FastScanner(File f) throws FileNotFoundException {\n this(new FileInputStream(f));\n }\n\n public FastScanner(String s) {\n this.stream = new ByteArrayInputStream(s.getBytes(StandardCharsets.UTF_8));\n }\n\n void close() {\n try {\n stream.close();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n\n int read() {\n if (numChars == -1) throw new InputMismatchException();\n if (curChar >= numChars) {\n curChar = 0;\n try {\n numChars = stream.read(buf);\n } catch (IOException e) {\n throw new InputMismatchException();\n }\n if (numChars <= 0) return -1;\n }\n return buf[curChar++];\n }\n\n boolean isSpaceChar(int c) {\n return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n }\n\n boolean isEndline(int c) {\n return c == '\\n' || c == '\\r' || c == -1;\n }\n\n public int nextInt() {\n return Integer.parseInt(next());\n }\n\n public long nextLong() {\n return Long.parseLong(next());\n }\n\n public double nextDouble() {\n return Double.parseDouble(next());\n }\n\n public String next() {\n int c = read();\n while (isSpaceChar(c)) c = read();\n StringBuilder res = new StringBuilder();\n do {\n res.appendCodePoint(c);\n c = read();\n } while (!isSpaceChar(c));\n return res.toString();\n }\n\n public String nextLine() {\n int c = read();\n while (isEndline(c)) c = read();\n StringBuilder res = new StringBuilder();\n do {\n res.appendCodePoint(c);\n c = read();\n } while (!isEndline(c));\n return res.toString();\n }\n\n public int[] nextIntArray(int N) {\n int[] ret = new int[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextInt();\n return ret;\n }\n\n public int[][] next2DIntArray(int N, int M) {\n int[][] ret = new int[N][];\n for (int i = 0; i < N; i++) ret[i] = this.nextIntArray(M);\n return ret;\n }\n\n public long[] nextLongArray(int N) {\n long[] ret = new long[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextLong();\n return ret;\n }\n\n public long[][] next2DLongArray(int N, int M) {\n long[][] ret = new long[N][];\n for (int i = 0; i < N; i++) ret[i] = nextLongArray(M);\n return ret;\n }\n\n public double[] nextDoubleArray(int N) {\n double[] ret = new double[N];\n for (int i = 0; i < N; i++) ret[i] = this.nextDouble();\n return ret;\n }\n\n public double[][] next2DDoubleArray(int N, int M) {\n double[][] ret = new double[N][];\n for (int i = 0; i < N; i++) ret[i] = this.nextDoubleArray(M);\n return ret;\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import static java.lang.Math.*;\n-\n-import java.io.*;\n-import java.util.*;\n-\n-public class test {\n- static final int MOD = 1000000007;\n- static final int intMax = 1000000000;\n- static final int intMin = -1000000000;\n- static final int[] dx = {0, 0, -1, 1};\n- static final int[] dy = {-1, 1, 0, 0};\n-\n- static int add(int a, int b) {\n- return (a + b) % MOD;\n+import java.io.ByteArrayInputStream;\n+import java.io.File;\n+import java.io.FileInputStream;\n+import java.io.FileNotFoundException;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.PrintWriter;\n+import java.nio.charset.StandardCharsets;\n+import java.util.ArrayList;\n+import java.util.Arrays;\n+import java.util.InputMismatchException;\n+\n+public class c {\n+\n+ static class Solver {\n+\n+ int N, dist[][], size[][], stsz[];\n+ ArrayList adj[];\n+\n+ void distDFS(int vtx, int rt, int par, int dep) {\n+ dist[rt][vtx] = dep;\n+ for (int v : adj[vtx]) if (v != par) distDFS(v, rt, vtx, dep + 1);\n+ }\n+\n+ void sizeDFS(int v, int p) {\n+ stsz[v] = 1;\n+ for (int w : adj[v]) {\n+ if (w == p) continue;\n+ sizeDFS(w, v);\n+ stsz[v] += stsz[w];\n+ size[v][w] = stsz[w];\n+ size[w][v] = N - size[v][w];\n+ }\n+ }\n+\n+ @SuppressWarnings(\"unchecked\")\n+ void solve(FastScanner s, PrintWriter out) {\n+ Arrays.setAll(adj = new ArrayList[N = s.nextInt()], x -> new ArrayList<>());\n+ for (int i = 1, u, v; i < N; i++) {\n+ u = s.nextInt() - 1;\n+ v = s.nextInt() - 1;\n+ adj[u].add(v);\n+ adj[v].add(u);\n+ }\n+\n+ dist = new int[N][N];\n+ for (int rt = 0; rt < N; rt++) distDFS(rt, rt, -1, 0);\n+ size = new int[N][N];\n+ stsz = new int[N];\n+ sizeDFS(0, -1);\n+\n+ memo = new long[N][N];\n+ for (long[] row : memo) Arrays.fill(row, -1);\n+\n+ long mx = 0, p;\n+ for (int i = 0; i < N; i++)\n+ for (int j : adj[i])\n+ if (i < j) {\n+ p = size[i][j] * size[j][i] + dp(i, j);\n+ if (p > mx) mx = p;\n+ }\n+ out.println(mx);\n+ }\n+\n+ long memo[][];\n+\n+ long dp(int u, int v) {\n+ if (u > v) u = v ^ u ^ (v = u);\n+ if (memo[u][v] != -1) return memo[u][v];\n+ long max = 0, poss, usz = 0, vsz = 0;\n+ for (int w : adj[u])\n+ if (dist[u][v] > dist[w][v]) {\n+ usz = size[w][u];\n+ break;\n+ }\n+ for (int w : adj[v])\n+ if (dist[v][u] > dist[w][u]) {\n+ vsz = size[w][v];\n+ break;\n+ }\n+\n+ for (int w : adj[u]) {\n+ if (dist[u][v] > dist[w][v]) continue;\n+ poss = size[u][w] * vsz + dp(w, v);\n+ if (poss > max) max = poss;\n+ }\n+ for (int w : adj[v]) {\n+ if (dist[v][u] > dist[w][u]) continue;\n+ poss = size[v][w] * usz + dp(w, u);\n+ if (poss > max) max = poss;\n+ }\n+ return memo[u][v] = max;\n+ }\n }\n \n- static int sub(int a, int b) {\n- return (a - b + MOD) % MOD;\n+ public static void main(String[] args) {\n+ FastScanner s = new FastScanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n+ new Solver().solve(s, out);\n+ out.close();\n+ s.close();\n }\n \n- static int mult(int a, int b) {\n- return (int) ((((long) (a)) * b) % MOD);\n- }\n-\n- static class Reader {\n- private final int BUFFER_SIZE = 1 << 16;\n- private DataInputStream din;\n- private byte[] buffer;\n- private int bufferPointer, bytesRead;\n-\n- public Reader() {\n- din = new DataInputStream(System.in);\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public Reader(String file_name) throws IOException {\n- din = new DataInputStream(new FileInputStream(file_name));\n- buffer = new byte[BUFFER_SIZE];\n- bufferPointer = bytesRead = 0;\n- }\n-\n- public String readLine() throws IOException {\n- byte[] buf = new byte[360];\n- int cnt = 0, c;\n- while ((c = read()) != -1) {\n- if (c == '\\n') break;\n- buf[cnt++] = (byte) c;\n- }\n- return new String(buf, 0, cnt);\n- }\n-\n- public int nextInt() throws IOException {\n- int ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public long nextLong() throws IOException {\n- long ret = 0;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- public double nextDouble() throws IOException {\n- double ret = 0, div = 1;\n- byte c = read();\n- while (c <= ' ') c = read();\n- boolean neg = (c == '-');\n- if (neg) c = read();\n-\n- do {\n- ret = ret * 10 + c - '0';\n- } while ((c = read()) >= '0' && c <= '9');\n-\n- if (c == '.') {\n- while ((c = read()) >= '0' && c <= '9') {\n- ret += (c - '0') / (div *= 10);\n- }\n- }\n-\n- if (neg) return -ret;\n- return ret;\n- }\n-\n- private void fillBuffer() throws IOException {\n- bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);\n- if (bytesRead == -1) buffer[0] = -1;\n- }\n-\n- private byte read() throws IOException {\n- if (bufferPointer == bytesRead) fillBuffer();\n- return buffer[bufferPointer++];\n- }\n-\n- public void close() throws IOException {\n- if (din == null) return;\n- din.close();\n- }\n- }\n-\n- static class Sb_Output implements Closeable, Flushable {\n- StringBuilder sb;\n- OutputStream os;\n- int BUFFER_SIZE;\n-\n- public Sb_Output(String s) throws Exception {\n- os = new BufferedOutputStream(new FileOutputStream(new File(s)));\n- BUFFER_SIZE = 1 << 16;\n- sb = new StringBuilder(BUFFER_SIZE);\n- }\n-\n- public void print(String s) {\n- sb.append(s);\n- if (sb.length() >= (BUFFER_SIZE >> 1)) {\n- flush();\n- }\n- }\n-\n- public void println(String s) {\n- print(s);\n- print(\"\\n\");\n- }\n-\n- public void println(int i) {\n- println(\"\" + i);\n- }\n-\n- public void println(long i) {\n- println(\"\" + i);\n- }\n-\n- public void flush() {\n+ static class FastScanner {\n+ private InputStream stream;\n+ private byte[] buf = new byte[1 << 22];\n+ private int curChar;\n+ private int numChars;\n+\n+ public FastScanner(InputStream stream) {\n+ this.stream = stream;\n+ }\n+\n+ public FastScanner(File f) throws FileNotFoundException {\n+ this(new FileInputStream(f));\n+ }\n+\n+ public FastScanner(String s) {\n+ this.stream = new ByteArrayInputStream(s.getBytes(StandardCharsets.UTF_8));\n+ }\n+\n+ void close() {\n try {\n- os.write(sb.toString().getBytes());\n- sb = new StringBuilder(BUFFER_SIZE);\n+ stream.close();\n } catch (IOException e) {\n e.printStackTrace();\n }\n }\n \n- public void close() {\n- flush();\n- try {\n- os.close();\n- } catch (IOException e) {\n- e.printStackTrace();\n- }\n- }\n- }\n-\n- static ArrayList[] adj;\n- static long results[][];\n-\n- public static void main(String[] args) throws Exception {\n- Reader in = new Reader();\n-\n- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));\n-\n- int n = Integer.parseInt(br.readLine());\n- adj = new ArrayList[n];\n- for (int i = 0; i < n; ++i) {\n- adj[i] = new ArrayList();\n- }\n- for (int i = 0; i < n - 1; ++i) {\n- StringTokenizer st = new StringTokenizer(br.readLine());\n- int u = Integer.parseInt(st.nextToken()) - 1;\n- int v = Integer.parseInt(st.nextToken()) - 1;\n- adj[u].add(v);\n- adj[v].add(u);\n- }\n- sz = new int[n];\n- cpar = new int[n];\n- vis = new boolean[n];\n- results = new long[n][n];\n- for (int i = 0; i < n; ++i) {\n- Arrays.fill(results[i], -1);\n- }\n- long ret = 0;\n- for (int cnd = 0; cnd < n; ++cnd) {\n- long ans = 0;\n- dfs(cnd, -1);\n- int mx = 0, mxind = 0;\n- for (int i : adj[cnd]) {\n- if (sz[i] > mx) {\n- mx = sz[i];\n- mxind = i;\n+ int read() {\n+ if (numChars == -1) throw new InputMismatchException();\n+ if (curChar >= numChars) {\n+ curChar = 0;\n+ try {\n+ numChars = stream.read(buf);\n+ } catch (IOException e) {\n+ throw new InputMismatchException();\n }\n- }\n- ans += (long) mx * (n - mx);\n-\n- long max = 0;\n- sz[cnd] = n - mx;\n- for (int i : adj[cnd]) {\n- if (i == mxind) continue;\n- max = max(max, solve(i, cnd, mxind, cnd));\n- }\n- for (int i : adj[mxind]) {\n- if (i == cnd) continue;\n- max = max(max, solve(i, mxind, cnd, mxind));\n- }\n- ret = max(ret, max + ans);\n- }\n- System.out.println(ret);\n- in.close();\n- }\n-\n- static long solve(int d1, int p1, int d2, int p2) {\n- if (results[d1][d2] != -1) {\n- return results[d1][d2];\n- }\n- long mx = 0;\n- for (int i : adj[d1]) {\n- if (i == p1 || i == d2) continue;\n- mx = max(mx, solve(i, d1, d2, p2));\n- }\n- for (int i : adj[d2]) {\n- if (i == p2 || i == d1) continue;\n- mx = max(mx, solve(d1, p1, i, d2));\n- }\n-\n- results[d1][d2] = results[d2][d1] = mx + (long) sz[d1] * sz[d2];\n- return mx + (long) sz[d1] * sz[d2];\n- }\n-\n- static class pair {\n- int x, y, same;\n-\n- pair(int a, int b) {\n- x = a;\n- y = b;\n- same = 0;\n- }\n- }\n-\n- static int[] sz, cpar;\n- static boolean vis[];\n- static int curans;\n-\n- static void dfs(int n, int p) {\n- sz[n] = 1;\n- for (int v : adj[n])\n- if (v != p && !vis[v]) {\n- dfs(v, n);\n- sz[n] += sz[v];\n- }\n- }\n-\n- static int centroid(int n) {\n- dfs(n, -1);\n- int num = sz[n];\n- int p = -1;\n- do {\n- int nxt = -1;\n- for (int v : adj[n])\n- if (v != p && !vis[v]) {\n- if (2 * sz[v] > num) nxt = v;\n- }\n- p = n;\n- n = nxt;\n- } while (~n != 0);\n- return p;\n- }\n-\n- static void centroid_decomp(int n, int p) {\n- int c = centroid(n);\n- vis[c] = true;\n- cpar[c] = p;\n- for (int v : adj[c])\n- if (!vis[v]) {\n- centroid_decomp(v, c);\n- }\n+ if (numChars <= 0) return -1;\n+ }\n+ return buf[curChar++];\n+ }\n+\n+ boolean isSpaceChar(int c) {\n+ return c == ' ' || c == '\\n' || c == '\\r' || c == '\\t' || c == -1;\n+ }\n+\n+ boolean isEndline(int c) {\n+ return c == '\\n' || c == '\\r' || c == -1;\n+ }\n+\n+ public int nextInt() {\n+ return Integer.parseInt(next());\n+ }\n+\n+ public long nextLong() {\n+ return Long.parseLong(next());\n+ }\n+\n+ public double nextDouble() {\n+ return Double.parseDouble(next());\n+ }\n+\n+ public String next() {\n+ int c = read();\n+ while (isSpaceChar(c)) c = read();\n+ StringBuilder res = new StringBuilder();\n+ do {\n+ res.appendCodePoint(c);\n+ c = read();\n+ } while (!isSpaceChar(c));\n+ return res.toString();\n+ }\n+\n+ public String nextLine() {\n+ int c = read();\n+ while (isEndline(c)) c = read();\n+ StringBuilder res = new StringBuilder();\n+ do {\n+ res.appendCodePoint(c);\n+ c = read();\n+ } while (!isEndline(c));\n+ return res.toString();\n+ }\n+\n+ public int[] nextIntArray(int N) {\n+ int[] ret = new int[N];\n+ for (int i = 0; i < N; i++) ret[i] = this.nextInt();\n+ return ret;\n+ }\n+\n+ public int[][] next2DIntArray(int N, int M) {\n+ int[][] ret = new int[N][];\n+ for (int i = 0; i < N; i++) ret[i] = this.nextIntArray(M);\n+ return ret;\n+ }\n+\n+ public long[] nextLongArray(int N) {\n+ long[] ret = new long[N];\n+ for (int i = 0; i < N; i++) ret[i] = this.nextLong();\n+ return ret;\n+ }\n+\n+ public long[][] next2DLongArray(int N, int M) {\n+ long[][] ret = new long[N][];\n+ for (int i = 0; i < N; i++) ret[i] = nextLongArray(M);\n+ return ret;\n+ }\n+\n+ public double[] nextDoubleArray(int N) {\n+ double[] ret = new double[N];\n+ for (int i = 0; i < N; i++) ret[i] = this.nextDouble();\n+ return ret;\n+ }\n+\n+ public double[][] next2DDoubleArray(int N, int M) {\n+ double[][] ret = new double[N][];\n+ for (int i = 0; i < N; i++) ret[i] = this.nextDoubleArray(M);\n+ return ret;\n+ }\n }\n }", "output": "SLOWER 4.9781", "problem_id": "1292_C", "direction": "reversed", "speedup_ratio": 31.5178, "pair_id": "java_12857_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class a {\n\n public static class in {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n\n public static long comp(int n, int r) {\n r = Math.min(r, n - r);\n long ans = 1;\n for (int i = 1; i <= r; i++) {\n ans = ans * (long) (n - r + i) / (long) i;\n }\n return ans;\n }\n\n public static int n;\n public static int m;\n\n public static int dp[][][];\n public static int sum = 0;\n public static long mod = 1000000007;\n public static int min = 0;\n\n public static long solve(int i, int s, int t) {\n if (i == n - m) {\n if (t == 0 && s >= min && s + sum == 0) return 1;\n if (t == 1 && s == 0) return 1;\n return 0;\n }\n if (t == 1 && (n - m) - i < s) return 0;\n\n if (t == 0 && (n - m) - i < s + sum) return 0;\n if (t == 0 && i + m > n) return 0;\n if (dp[i][s][t] != -1) return dp[i][s][t] % mod;\n\n long aa = 0;\n if (t == 0) {\n if (s + sum >= 0 && s >= min) {\n aa += solve(i, s + sum, 1) % mod;\n }\n }\n\n aa += solve(i + 1, s + 1, t) % mod;\n if (s - 1 >= 0) aa += solve(i + 1, s - 1, t) % mod;\n aa %= mod;\n return dp[i][s][t] = (int) aa;\n }\n\n public static void main(String[] args) throws IOException {\n StringBuilder qq = new StringBuilder();\n in.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n n = in.nextInt();\n m = in.nextInt();\n\n String a = in.next();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') sum++;\n else sum--;\n\n if (sum < 0) min = Math.max(min, Math.abs(sum));\n }\n if (n == m && min == 0 && sum == 0) {\n System.out.println(1);\n return;\n }\n\n dp = new int[n - m][2005][2];\n for (int i = 0; i < n - m; i++) {\n for (int j = 0; j < 2005; j++) {\n Arrays.fill(dp[i][j], -1);\n }\n }\n out.println(solve(0, 0, 0) % mod);\n\n out.close();\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Scanner;\n\npublic class C {\n\n private static final long MOD = (long) (1e9 + 7);\n private static long[][] dp;\n\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n String s = scanner.next();\n\n int minBalance = Integer.MAX_VALUE;\n int balance = 0;\n\n for (int i = 0; i < m; i++) {\n if (s.charAt(i) == '(') {\n balance++;\n } else {\n balance--;\n }\n minBalance = Math.min(balance, minBalance);\n }\n\n dp = new long[2000 + 10][2000 + 10];\n for (int i = 0; i <= 2000 + 1; i++) {\n if (i == 0) {\n dp[0][0] = 1;\n } else {\n dp[i][0] = dp[i - 1][1];\n }\n\n for (int j = 1; j <= i; j++) {\n dp[i][j] = (dp[i - 1][j - 1] + dp[i - 1][j + 1]) % MOD;\n }\n }\n\n long ans = 0;\n for (int i = 0; i <= n - m; i++) {\n for (int j = 0; j <= i; j++) {\n\n if (balance + j > n - m - i) continue;\n\n if (minBalance + j < 0) continue;\n\n ans = (ans + (dp[i][j] * dp[n - m - i][balance + j]) % MOD) % MOD;\n }\n }\n\n System.out.println(ans);\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.BufferedReader;\n-import java.io.IOException;\n-import java.io.InputStream;\n-import java.io.InputStreamReader;\n-import java.io.PrintWriter;\n-import java.util.Arrays;\n-import java.util.StringTokenizer;\n+import java.util.Scanner;\n \n-public class a {\n+public class C {\n \n- public static class in {\n- static BufferedReader reader;\n- static StringTokenizer tokenizer;\n+ private static final long MOD = (long) (1e9 + 7);\n+ private static long[][] dp;\n \n- static void init(InputStream input) {\n- reader = new BufferedReader(new InputStreamReader(input));\n- tokenizer = new StringTokenizer(\"\");\n+ public static void main(String[] args) {\n+ Scanner scanner = new Scanner(System.in);\n+\n+ int n = scanner.nextInt();\n+ int m = scanner.nextInt();\n+ String s = scanner.next();\n+\n+ int minBalance = Integer.MAX_VALUE;\n+ int balance = 0;\n+\n+ for (int i = 0; i < m; i++) {\n+ if (s.charAt(i) == '(') {\n+ balance++;\n+ } else {\n+ balance--;\n+ }\n+ minBalance = Math.min(balance, minBalance);\n }\n \n- static String next() throws IOException {\n- while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());\n- return tokenizer.nextToken();\n- }\n+ dp = new long[2000 + 10][2000 + 10];\n+ for (int i = 0; i <= 2000 + 1; i++) {\n+ if (i == 0) {\n+ dp[0][0] = 1;\n+ } else {\n+ dp[i][0] = dp[i - 1][1];\n+ }\n \n- static int nextInt() throws IOException {\n- return Integer.parseInt(next());\n- }\n-\n- static double nextDouble() throws IOException {\n- return Double.parseDouble(next());\n- }\n-\n- static long nextLong() throws IOException {\n- return Long.parseLong(next());\n- }\n- }\n-\n- public static long comp(int n, int r) {\n- r = Math.min(r, n - r);\n- long ans = 1;\n- for (int i = 1; i <= r; i++) {\n- ans = ans * (long) (n - r + i) / (long) i;\n- }\n- return ans;\n- }\n-\n- public static int n;\n- public static int m;\n-\n- public static int dp[][][];\n- public static int sum = 0;\n- public static long mod = 1000000007;\n- public static int min = 0;\n-\n- public static long solve(int i, int s, int t) {\n- if (i == n - m) {\n- if (t == 0 && s >= min && s + sum == 0) return 1;\n- if (t == 1 && s == 0) return 1;\n- return 0;\n- }\n- if (t == 1 && (n - m) - i < s) return 0;\n-\n- if (t == 0 && (n - m) - i < s + sum) return 0;\n- if (t == 0 && i + m > n) return 0;\n- if (dp[i][s][t] != -1) return dp[i][s][t] % mod;\n-\n- long aa = 0;\n- if (t == 0) {\n- if (s + sum >= 0 && s >= min) {\n- aa += solve(i, s + sum, 1) % mod;\n+ for (int j = 1; j <= i; j++) {\n+ dp[i][j] = (dp[i - 1][j - 1] + dp[i - 1][j + 1]) % MOD;\n }\n }\n \n- aa += solve(i + 1, s + 1, t) % mod;\n- if (s - 1 >= 0) aa += solve(i + 1, s - 1, t) % mod;\n- aa %= mod;\n- return dp[i][s][t] = (int) aa;\n- }\n+ long ans = 0;\n+ for (int i = 0; i <= n - m; i++) {\n+ for (int j = 0; j <= i; j++) {\n \n- public static void main(String[] args) throws IOException {\n- StringBuilder qq = new StringBuilder();\n- in.init(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n+ if (balance + j > n - m - i) continue;\n \n- n = in.nextInt();\n- m = in.nextInt();\n+ if (minBalance + j < 0) continue;\n \n- String a = in.next();\n- for (int i = 0; i < a.length(); i++) {\n- if (a.charAt(i) == '(') sum++;\n- else sum--;\n-\n- if (sum < 0) min = Math.max(min, Math.abs(sum));\n- }\n- if (n == m && min == 0 && sum == 0) {\n- System.out.println(1);\n- return;\n+ ans = (ans + (dp[i][j] * dp[n - m - i][balance + j]) % MOD) % MOD;\n+ }\n }\n \n- dp = new int[n - m][2005][2];\n- for (int i = 0; i < n - m; i++) {\n- for (int j = 0; j < 2005; j++) {\n- Arrays.fill(dp[i][j], -1);\n- }\n- }\n- out.println(solve(0, 0, 0) % mod);\n-\n- out.close();\n+ System.out.println(ans);\n }\n }", "output": "FASTER 1.5628", "problem_id": "629_C", "direction": "forward", "speedup_ratio": 2.9542, "pair_id": "java_816_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Scanner;\n\npublic class C {\n\n private static final long MOD = (long) (1e9 + 7);\n private static long[][] dp;\n\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n\n int n = scanner.nextInt();\n int m = scanner.nextInt();\n String s = scanner.next();\n\n int minBalance = Integer.MAX_VALUE;\n int balance = 0;\n\n for (int i = 0; i < m; i++) {\n if (s.charAt(i) == '(') {\n balance++;\n } else {\n balance--;\n }\n minBalance = Math.min(balance, minBalance);\n }\n\n dp = new long[2000 + 10][2000 + 10];\n for (int i = 0; i <= 2000 + 1; i++) {\n if (i == 0) {\n dp[0][0] = 1;\n } else {\n dp[i][0] = dp[i - 1][1];\n }\n\n for (int j = 1; j <= i; j++) {\n dp[i][j] = (dp[i - 1][j - 1] + dp[i - 1][j + 1]) % MOD;\n }\n }\n\n long ans = 0;\n for (int i = 0; i <= n - m; i++) {\n for (int j = 0; j <= i; j++) {\n\n if (balance + j > n - m - i) continue;\n\n if (minBalance + j < 0) continue;\n\n ans = (ans + (dp[i][j] * dp[n - m - i][balance + j]) % MOD) % MOD;\n }\n }\n\n System.out.println(ans);\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.io.InputStreamReader;\nimport java.io.PrintWriter;\nimport java.util.Arrays;\nimport java.util.StringTokenizer;\n\npublic class a {\n\n public static class in {\n static BufferedReader reader;\n static StringTokenizer tokenizer;\n\n static void init(InputStream input) {\n reader = new BufferedReader(new InputStreamReader(input));\n tokenizer = new StringTokenizer(\"\");\n }\n\n static String next() throws IOException {\n while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());\n return tokenizer.nextToken();\n }\n\n static int nextInt() throws IOException {\n return Integer.parseInt(next());\n }\n\n static double nextDouble() throws IOException {\n return Double.parseDouble(next());\n }\n\n static long nextLong() throws IOException {\n return Long.parseLong(next());\n }\n }\n\n public static long comp(int n, int r) {\n r = Math.min(r, n - r);\n long ans = 1;\n for (int i = 1; i <= r; i++) {\n ans = ans * (long) (n - r + i) / (long) i;\n }\n return ans;\n }\n\n public static int n;\n public static int m;\n\n public static int dp[][][];\n public static int sum = 0;\n public static long mod = 1000000007;\n public static int min = 0;\n\n public static long solve(int i, int s, int t) {\n if (i == n - m) {\n if (t == 0 && s >= min && s + sum == 0) return 1;\n if (t == 1 && s == 0) return 1;\n return 0;\n }\n if (t == 1 && (n - m) - i < s) return 0;\n\n if (t == 0 && (n - m) - i < s + sum) return 0;\n if (t == 0 && i + m > n) return 0;\n if (dp[i][s][t] != -1) return dp[i][s][t] % mod;\n\n long aa = 0;\n if (t == 0) {\n if (s + sum >= 0 && s >= min) {\n aa += solve(i, s + sum, 1) % mod;\n }\n }\n\n aa += solve(i + 1, s + 1, t) % mod;\n if (s - 1 >= 0) aa += solve(i + 1, s - 1, t) % mod;\n aa %= mod;\n return dp[i][s][t] = (int) aa;\n }\n\n public static void main(String[] args) throws IOException {\n StringBuilder qq = new StringBuilder();\n in.init(System.in);\n PrintWriter out = new PrintWriter(System.out);\n\n n = in.nextInt();\n m = in.nextInt();\n\n String a = in.next();\n for (int i = 0; i < a.length(); i++) {\n if (a.charAt(i) == '(') sum++;\n else sum--;\n\n if (sum < 0) min = Math.max(min, Math.abs(sum));\n }\n if (n == m && min == 0 && sum == 0) {\n System.out.println(1);\n return;\n }\n\n dp = new int[n - m][2005][2];\n for (int i = 0; i < n - m; i++) {\n for (int j = 0; j < 2005; j++) {\n Arrays.fill(dp[i][j], -1);\n }\n }\n out.println(solve(0, 0, 0) % mod);\n\n out.close();\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Scanner;\n+import java.io.BufferedReader;\n+import java.io.IOException;\n+import java.io.InputStream;\n+import java.io.InputStreamReader;\n+import java.io.PrintWriter;\n+import java.util.Arrays;\n+import java.util.StringTokenizer;\n \n-public class C {\n+public class a {\n \n- private static final long MOD = (long) (1e9 + 7);\n- private static long[][] dp;\n+ public static class in {\n+ static BufferedReader reader;\n+ static StringTokenizer tokenizer;\n \n- public static void main(String[] args) {\n- Scanner scanner = new Scanner(System.in);\n-\n- int n = scanner.nextInt();\n- int m = scanner.nextInt();\n- String s = scanner.next();\n-\n- int minBalance = Integer.MAX_VALUE;\n- int balance = 0;\n-\n- for (int i = 0; i < m; i++) {\n- if (s.charAt(i) == '(') {\n- balance++;\n- } else {\n- balance--;\n- }\n- minBalance = Math.min(balance, minBalance);\n+ static void init(InputStream input) {\n+ reader = new BufferedReader(new InputStreamReader(input));\n+ tokenizer = new StringTokenizer(\"\");\n }\n \n- dp = new long[2000 + 10][2000 + 10];\n- for (int i = 0; i <= 2000 + 1; i++) {\n- if (i == 0) {\n- dp[0][0] = 1;\n- } else {\n- dp[i][0] = dp[i - 1][1];\n- }\n+ static String next() throws IOException {\n+ while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());\n+ return tokenizer.nextToken();\n+ }\n \n- for (int j = 1; j <= i; j++) {\n- dp[i][j] = (dp[i - 1][j - 1] + dp[i - 1][j + 1]) % MOD;\n+ static int nextInt() throws IOException {\n+ return Integer.parseInt(next());\n+ }\n+\n+ static double nextDouble() throws IOException {\n+ return Double.parseDouble(next());\n+ }\n+\n+ static long nextLong() throws IOException {\n+ return Long.parseLong(next());\n+ }\n+ }\n+\n+ public static long comp(int n, int r) {\n+ r = Math.min(r, n - r);\n+ long ans = 1;\n+ for (int i = 1; i <= r; i++) {\n+ ans = ans * (long) (n - r + i) / (long) i;\n+ }\n+ return ans;\n+ }\n+\n+ public static int n;\n+ public static int m;\n+\n+ public static int dp[][][];\n+ public static int sum = 0;\n+ public static long mod = 1000000007;\n+ public static int min = 0;\n+\n+ public static long solve(int i, int s, int t) {\n+ if (i == n - m) {\n+ if (t == 0 && s >= min && s + sum == 0) return 1;\n+ if (t == 1 && s == 0) return 1;\n+ return 0;\n+ }\n+ if (t == 1 && (n - m) - i < s) return 0;\n+\n+ if (t == 0 && (n - m) - i < s + sum) return 0;\n+ if (t == 0 && i + m > n) return 0;\n+ if (dp[i][s][t] != -1) return dp[i][s][t] % mod;\n+\n+ long aa = 0;\n+ if (t == 0) {\n+ if (s + sum >= 0 && s >= min) {\n+ aa += solve(i, s + sum, 1) % mod;\n }\n }\n \n- long ans = 0;\n- for (int i = 0; i <= n - m; i++) {\n- for (int j = 0; j <= i; j++) {\n+ aa += solve(i + 1, s + 1, t) % mod;\n+ if (s - 1 >= 0) aa += solve(i + 1, s - 1, t) % mod;\n+ aa %= mod;\n+ return dp[i][s][t] = (int) aa;\n+ }\n \n- if (balance + j > n - m - i) continue;\n+ public static void main(String[] args) throws IOException {\n+ StringBuilder qq = new StringBuilder();\n+ in.init(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n \n- if (minBalance + j < 0) continue;\n+ n = in.nextInt();\n+ m = in.nextInt();\n \n- ans = (ans + (dp[i][j] * dp[n - m - i][balance + j]) % MOD) % MOD;\n+ String a = in.next();\n+ for (int i = 0; i < a.length(); i++) {\n+ if (a.charAt(i) == '(') sum++;\n+ else sum--;\n+\n+ if (sum < 0) min = Math.max(min, Math.abs(sum));\n+ }\n+ if (n == m && min == 0 && sum == 0) {\n+ System.out.println(1);\n+ return;\n+ }\n+\n+ dp = new int[n - m][2005][2];\n+ for (int i = 0; i < n - m; i++) {\n+ for (int j = 0; j < 2005; j++) {\n+ Arrays.fill(dp[i][j], -1);\n }\n }\n+ out.println(solve(0, 0, 0) % mod);\n \n- System.out.println(ans);\n+ out.close();\n }\n }", "output": "SLOWER 1.5628", "problem_id": "629_C", "direction": "reversed", "speedup_ratio": 2.9542, "pair_id": "java_816_reversed", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n static int INF = 2 << 27;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n while (true) {\n int n = sc.nextInt();\n if (n == 0) break;\n int[] p = new int[n];\n int[] t = new int[n];\n for (int i = 0; i < n; i++) {\n p[i] = sc.nextInt();\n t[i] = sc.nextInt();\n if (i != 0) {}\n }\n int[][] dp = new int[n + 1][4];\n for (int i = 0; i < dp.length; i++) {\n Arrays.fill(dp[i], INF);\n }\n dp[0][0] = 0;\n int BAD = -1;\n for (int i = 0; i < n; i++) {\n boolean ok = false;\n for (int k = 0; k < 4; k++) {\n if (dp[i][k] == INF) continue;\n int len = p[i];\n int time = t[i];\n if (i != 0) {\n len = Math.abs(p[i - 1] - p[i]);\n time = t[i] - t[i - 1];\n }\n\n if (k + 1 <= 3 && len * (k + 1) <= time) {\n if (i != n - 1) dp[i + 1][k + 1] = Math.min(dp[i + 1][k + 1], dp[i][k] + len);\n else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + len + p[i]);\n ok = true;\n }\n\n if (i != 0 && p[i - 1] * (k + 1) + p[i] <= time) {\n if (i != n - 1) dp[i + 1][1] = Math.min(dp[i + 1][1], dp[i][k] + p[i - 1] + p[i]);\n else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + p[i - 1] + p[i] + p[i]);\n ok = true;\n }\n }\n if (!ok && BAD == -1) {\n BAD = (i + 1);\n }\n }\n int LOW = INF;\n for (int i = 0; i < 4; i++) {\n LOW = Math.min(dp[n][0], LOW);\n }\n if (BAD != -1) System.out.println(\"NG \" + BAD);\n else System.out.println(\"OK \" + LOW);\n }\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner sc = new Scanner(System.in);\n static int N;\n static int[] P = new int[42];\n static int[] T = new int[42];\n\n public static void main(String[] args) {\n while (true) {\n N = sc.nextInt();\n if (N == 0) break;\n for (int i = 0; i < N; ++i) {\n P[i + 1] = sc.nextInt();\n T[i + 1] = sc.nextInt();\n }\n P[N + 1] = 0;\n T[N + 1] = 200000;\n System.out.println(solve());\n }\n }\n\n static String solve() {\n int[][] dp = new int[N + 2][4];\n int INF = 1 << 28;\n for (int[] a : dp) {\n Arrays.fill(a, INF);\n }\n dp[0][0] = 0;\n for (int i = 1; i <= N + 1; ++i) {\n boolean ok = false;\n for (int j = 0; j < 4; ++j) {\n if (dp[i - 1][j] == INF) continue;\n ok = true;\n if (j != 3 && Math.abs(P[i] - P[i - 1]) * (j + 1) <= T[i] - T[i - 1]) {\n dp[i][j + 1] = Math.min(dp[i][j + 1], dp[i - 1][j] + Math.abs(P[i] - P[i - 1]));\n }\n if (P[i - 1] * (j + 1) + P[i] <= T[i] - T[i - 1]) {\n dp[i][1] = Math.min(dp[i][1], dp[i - 1][j] + P[i - 1] + P[i]);\n }\n }\n if (!ok) {\n return \"NG \" + (i - 1);\n }\n }\n int min = INF;\n for (int i = 0; i < 4; ++i) {\n min = Math.min(min, dp[N + 1][i]);\n }\n return \"OK \" + min;\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.io.PrintWriter;\n-import java.util.*;\n+import java.util.Arrays;\n+import java.util.Scanner;\n \n public class Main {\n- static int INF = 2 << 27;\n+ static Scanner sc = new Scanner(System.in);\n+ static int N;\n+ static int[] P = new int[42];\n+ static int[] T = new int[42];\n \n public static void main(String[] args) {\n+ while (true) {\n+ N = sc.nextInt();\n+ if (N == 0) break;\n+ for (int i = 0; i < N; ++i) {\n+ P[i + 1] = sc.nextInt();\n+ T[i + 1] = sc.nextInt();\n+ }\n+ P[N + 1] = 0;\n+ T[N + 1] = 200000;\n+ System.out.println(solve());\n+ }\n+ }\n \n- Scanner sc = new Scanner(System.in);\n- PrintWriter out = new PrintWriter(System.out);\n- while (true) {\n- int n = sc.nextInt();\n- if (n == 0) break;\n- int[] p = new int[n];\n- int[] t = new int[n];\n- for (int i = 0; i < n; i++) {\n- p[i] = sc.nextInt();\n- t[i] = sc.nextInt();\n- if (i != 0) {}\n- }\n- int[][] dp = new int[n + 1][4];\n- for (int i = 0; i < dp.length; i++) {\n- Arrays.fill(dp[i], INF);\n- }\n- dp[0][0] = 0;\n- int BAD = -1;\n- for (int i = 0; i < n; i++) {\n- boolean ok = false;\n- for (int k = 0; k < 4; k++) {\n- if (dp[i][k] == INF) continue;\n- int len = p[i];\n- int time = t[i];\n- if (i != 0) {\n- len = Math.abs(p[i - 1] - p[i]);\n- time = t[i] - t[i - 1];\n- }\n-\n- if (k + 1 <= 3 && len * (k + 1) <= time) {\n- if (i != n - 1) dp[i + 1][k + 1] = Math.min(dp[i + 1][k + 1], dp[i][k] + len);\n- else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + len + p[i]);\n- ok = true;\n- }\n-\n- if (i != 0 && p[i - 1] * (k + 1) + p[i] <= time) {\n- if (i != n - 1) dp[i + 1][1] = Math.min(dp[i + 1][1], dp[i][k] + p[i - 1] + p[i]);\n- else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + p[i - 1] + p[i] + p[i]);\n- ok = true;\n- }\n+ static String solve() {\n+ int[][] dp = new int[N + 2][4];\n+ int INF = 1 << 28;\n+ for (int[] a : dp) {\n+ Arrays.fill(a, INF);\n+ }\n+ dp[0][0] = 0;\n+ for (int i = 1; i <= N + 1; ++i) {\n+ boolean ok = false;\n+ for (int j = 0; j < 4; ++j) {\n+ if (dp[i - 1][j] == INF) continue;\n+ ok = true;\n+ if (j != 3 && Math.abs(P[i] - P[i - 1]) * (j + 1) <= T[i] - T[i - 1]) {\n+ dp[i][j + 1] = Math.min(dp[i][j + 1], dp[i - 1][j] + Math.abs(P[i] - P[i - 1]));\n }\n- if (!ok && BAD == -1) {\n- BAD = (i + 1);\n+ if (P[i - 1] * (j + 1) + P[i] <= T[i] - T[i - 1]) {\n+ dp[i][1] = Math.min(dp[i][1], dp[i - 1][j] + P[i - 1] + P[i]);\n }\n }\n- int LOW = INF;\n- for (int i = 0; i < 4; i++) {\n- LOW = Math.min(dp[n][0], LOW);\n+ if (!ok) {\n+ return \"NG \" + (i - 1);\n }\n- if (BAD != -1) System.out.println(\"NG \" + BAD);\n- else System.out.println(\"OK \" + LOW);\n }\n+ int min = INF;\n+ for (int i = 0; i < 4; ++i) {\n+ min = Math.min(min, dp[N + 1][i]);\n+ }\n+ return \"OK \" + min;\n }\n }", "output": "FASTER 0.0016", "problem_id": "p00885", "direction": "forward", "speedup_ratio": 1.0011, "pair_id": "java_2172_forward", "language": "java"} +{"instruction": "You are a code performance analysis expert. Given two code versions (A and B) and their diff, predict the performance impact of changing from A to B.\n\nFirst determine the performance change direction, then provide the specific value:\n- FASTER: Code B is faster than Code A\n- SLOWER: Code B is slower than Code A\n\nOutput format: [direction] [log2(speedup)]\n\nExample outputs:\n- \"FASTER 2.5\" means approximately 5.7x faster (2^2.5)\n- \"SLOWER 1.5\" means approximately 2.8x slower (2^1.5)", "input": "=== Code A (Original) ===\n```java\nimport java.util.Arrays;\nimport java.util.Scanner;\n\npublic class Main {\n static Scanner sc = new Scanner(System.in);\n static int N;\n static int[] P = new int[42];\n static int[] T = new int[42];\n\n public static void main(String[] args) {\n while (true) {\n N = sc.nextInt();\n if (N == 0) break;\n for (int i = 0; i < N; ++i) {\n P[i + 1] = sc.nextInt();\n T[i + 1] = sc.nextInt();\n }\n P[N + 1] = 0;\n T[N + 1] = 200000;\n System.out.println(solve());\n }\n }\n\n static String solve() {\n int[][] dp = new int[N + 2][4];\n int INF = 1 << 28;\n for (int[] a : dp) {\n Arrays.fill(a, INF);\n }\n dp[0][0] = 0;\n for (int i = 1; i <= N + 1; ++i) {\n boolean ok = false;\n for (int j = 0; j < 4; ++j) {\n if (dp[i - 1][j] == INF) continue;\n ok = true;\n if (j != 3 && Math.abs(P[i] - P[i - 1]) * (j + 1) <= T[i] - T[i - 1]) {\n dp[i][j + 1] = Math.min(dp[i][j + 1], dp[i - 1][j] + Math.abs(P[i] - P[i - 1]));\n }\n if (P[i - 1] * (j + 1) + P[i] <= T[i] - T[i - 1]) {\n dp[i][1] = Math.min(dp[i][1], dp[i - 1][j] + P[i - 1] + P[i]);\n }\n }\n if (!ok) {\n return \"NG \" + (i - 1);\n }\n }\n int min = INF;\n for (int i = 0; i < 4; ++i) {\n min = Math.min(min, dp[N + 1][i]);\n }\n return \"OK \" + min;\n }\n}\n```\n\n=== Code B (Modified) ===\n```java\nimport java.io.PrintWriter;\nimport java.util.*;\n\npublic class Main {\n static int INF = 2 << 27;\n\n public static void main(String[] args) {\n\n Scanner sc = new Scanner(System.in);\n PrintWriter out = new PrintWriter(System.out);\n while (true) {\n int n = sc.nextInt();\n if (n == 0) break;\n int[] p = new int[n];\n int[] t = new int[n];\n for (int i = 0; i < n; i++) {\n p[i] = sc.nextInt();\n t[i] = sc.nextInt();\n if (i != 0) {}\n }\n int[][] dp = new int[n + 1][4];\n for (int i = 0; i < dp.length; i++) {\n Arrays.fill(dp[i], INF);\n }\n dp[0][0] = 0;\n int BAD = -1;\n for (int i = 0; i < n; i++) {\n boolean ok = false;\n for (int k = 0; k < 4; k++) {\n if (dp[i][k] == INF) continue;\n int len = p[i];\n int time = t[i];\n if (i != 0) {\n len = Math.abs(p[i - 1] - p[i]);\n time = t[i] - t[i - 1];\n }\n\n if (k + 1 <= 3 && len * (k + 1) <= time) {\n if (i != n - 1) dp[i + 1][k + 1] = Math.min(dp[i + 1][k + 1], dp[i][k] + len);\n else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + len + p[i]);\n ok = true;\n }\n\n if (i != 0 && p[i - 1] * (k + 1) + p[i] <= time) {\n if (i != n - 1) dp[i + 1][1] = Math.min(dp[i + 1][1], dp[i][k] + p[i - 1] + p[i]);\n else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + p[i - 1] + p[i] + p[i]);\n ok = true;\n }\n }\n if (!ok && BAD == -1) {\n BAD = (i + 1);\n }\n }\n int LOW = INF;\n for (int i = 0; i < 4; i++) {\n LOW = Math.min(dp[n][0], LOW);\n }\n if (BAD != -1) System.out.println(\"NG \" + BAD);\n else System.out.println(\"OK \" + LOW);\n }\n }\n}\n```\n\n=== Diff (A → B) ===\n--- code_a\n+++ code_b\n-import java.util.Arrays;\n-import java.util.Scanner;\n+import java.io.PrintWriter;\n+import java.util.*;\n \n public class Main {\n- static Scanner sc = new Scanner(System.in);\n- static int N;\n- static int[] P = new int[42];\n- static int[] T = new int[42];\n+ static int INF = 2 << 27;\n \n public static void main(String[] args) {\n+\n+ Scanner sc = new Scanner(System.in);\n+ PrintWriter out = new PrintWriter(System.out);\n while (true) {\n- N = sc.nextInt();\n- if (N == 0) break;\n- for (int i = 0; i < N; ++i) {\n- P[i + 1] = sc.nextInt();\n- T[i + 1] = sc.nextInt();\n+ int n = sc.nextInt();\n+ if (n == 0) break;\n+ int[] p = new int[n];\n+ int[] t = new int[n];\n+ for (int i = 0; i < n; i++) {\n+ p[i] = sc.nextInt();\n+ t[i] = sc.nextInt();\n+ if (i != 0) {}\n }\n- P[N + 1] = 0;\n- T[N + 1] = 200000;\n- System.out.println(solve());\n+ int[][] dp = new int[n + 1][4];\n+ for (int i = 0; i < dp.length; i++) {\n+ Arrays.fill(dp[i], INF);\n+ }\n+ dp[0][0] = 0;\n+ int BAD = -1;\n+ for (int i = 0; i < n; i++) {\n+ boolean ok = false;\n+ for (int k = 0; k < 4; k++) {\n+ if (dp[i][k] == INF) continue;\n+ int len = p[i];\n+ int time = t[i];\n+ if (i != 0) {\n+ len = Math.abs(p[i - 1] - p[i]);\n+ time = t[i] - t[i - 1];\n+ }\n+\n+ if (k + 1 <= 3 && len * (k + 1) <= time) {\n+ if (i != n - 1) dp[i + 1][k + 1] = Math.min(dp[i + 1][k + 1], dp[i][k] + len);\n+ else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + len + p[i]);\n+ ok = true;\n+ }\n+\n+ if (i != 0 && p[i - 1] * (k + 1) + p[i] <= time) {\n+ if (i != n - 1) dp[i + 1][1] = Math.min(dp[i + 1][1], dp[i][k] + p[i - 1] + p[i]);\n+ else dp[i + 1][0] = Math.min(dp[i + 1][0], dp[i][k] + p[i - 1] + p[i] + p[i]);\n+ ok = true;\n+ }\n+ }\n+ if (!ok && BAD == -1) {\n+ BAD = (i + 1);\n+ }\n+ }\n+ int LOW = INF;\n+ for (int i = 0; i < 4; i++) {\n+ LOW = Math.min(dp[n][0], LOW);\n+ }\n+ if (BAD != -1) System.out.println(\"NG \" + BAD);\n+ else System.out.println(\"OK \" + LOW);\n }\n }\n-\n- static String solve() {\n- int[][] dp = new int[N + 2][4];\n- int INF = 1 << 28;\n- for (int[] a : dp) {\n- Arrays.fill(a, INF);\n- }\n- dp[0][0] = 0;\n- for (int i = 1; i <= N + 1; ++i) {\n- boolean ok = false;\n- for (int j = 0; j < 4; ++j) {\n- if (dp[i - 1][j] == INF) continue;\n- ok = true;\n- if (j != 3 && Math.abs(P[i] - P[i - 1]) * (j + 1) <= T[i] - T[i - 1]) {\n- dp[i][j + 1] = Math.min(dp[i][j + 1], dp[i - 1][j] + Math.abs(P[i] - P[i - 1]));\n- }\n- if (P[i - 1] * (j + 1) + P[i] <= T[i] - T[i - 1]) {\n- dp[i][1] = Math.min(dp[i][1], dp[i - 1][j] + P[i - 1] + P[i]);\n- }\n- }\n- if (!ok) {\n- return \"NG \" + (i - 1);\n- }\n- }\n- int min = INF;\n- for (int i = 0; i < 4; ++i) {\n- min = Math.min(min, dp[N + 1][i]);\n- }\n- return \"OK \" + min;\n- }\n }", "output": "SLOWER 0.0016", "problem_id": "p00885", "direction": "reversed", "speedup_ratio": 1.0011, "pair_id": "java_2172_reversed", "language": "java"}